6 Most Accurate Outdoor Thermometers of 2021

Last update: 2021-05-17

An outdoor thermometer is not just a device with numbers on it. It is now a high-end gadget that measures accurate temperature and humidity. Not only that, but some models can also read hours of sunlight, wind, and precipitation.

The most accurate outdoor thermometer can tell you the weather so that you can prepare your day better.

It was a fun work researching about thermometers. I have more than 10 of them in my storage, and some of them really satisfy me in all aspects. Won’t take more of your time. I’ll share it with you right now.

Here are the most accurate outdoor thermometers you can buy in 2021:

  • Best Overall: ThermoPro TP65A Indoor Outdoor Thermometer Digital Wireless Hygrometer
  • Easy to Read: Marathon Vertical Outdoor Thermometer
  • Best for A Shadier Location: AcuRite 00424CA Digital Thermometer with Indoor/Outdoor Temperature
  • Easy to Set Up: AcuRite 00782A2 Wireless Indoor/Outdoor Thermometer
  • Sleek Design: Wittime Latest 2079 Wireless Indoor Outdoor Thermometer
  • Best for Monitoring Multiple Zones: ORIA Indoor Outdoor Thermometer
6 Most Accurate Outdoor Thermometers
Best Overall
ThermoPro TP65A Indoor Outdoor Thermometer Digital Wireless Hygrometer
    Easy to Read
    Marathon Vertical Outdoor Thermometer
      Best for A Shadier Location
      AcuRite 00424CA Digital Thermometer with Indoor/Outdoor Temperature
        Easy to Set Up
        AcuRite 00782A2 Wireless Indoor/Outdoor Thermometer
          Sleek Design
          Wittime Latest 2079 Wireless Indoor Outdoor Thermometer
            Best for Monitoring Multiple Zones
            ORIA Indoor Outdoor Thermometer

              Best Overall: ThermoPro TP65A Indoor Outdoor Thermometer Digital Wireless Hygrometer

              ThermoPro TP65A Indoor Outdoor Thermometer Digital Wireless Hygrometer
              ThermoPro TP65A Indoor Outdoor Thermometer Digital Wireless Hygrometer
              9.4Outstanding
              Pros
              • Accurate reading

              • Simple to install

              • Easy to control touch screen

              • Large number easy to read

              Cons
              • Inconsistent performance

              • Eat batteries

              If you ask me which thermometer makes me happy the most, this is the one.

              This thermometer displays temperature in Celsius or Fahrenheit. There is a button that allows you to toggle between the two metrics. You can also review the history of temp on the screen. The humidity levels are shown in percent. In the lower section is the indication of the outdoor sensor.

              What’s most important is the data shown is quite accurate. I actually waited for a week to determine the accuracy of this gadget. It’ll display up to 4 channels. The default one is set with the provided sensor, but you can buy additional sensors to pair with this device.

              It comes with an outdoor component powered on rechargeable batteries. They supply a USB cable for recharging.

              The unique thing about this particular meter is the touch screen. You can turn on the screen light from here for better visibility in 10 minutes.

              With the built-in magnet on the back, you can just hang it on your refrigerator, which I think, is a very convenient plus.

              ThermoPro TP65A Indoor Outdoor Thermometer Digital Wireless Hygrometer Specifications

              Dimensions

              4.3 x 3.3 x 1 inches

              Outdoor Temperature Range

              -4°F~158°F (-20°C~70°C)

              Remote Range

              200ft

              Highlight Features

              Sensitive and responsive sensor. Large touchscreen. Record max and min temperature

              Verdict

              The meter just has everything I want and more. Love the accurate measurement and large readouts.

              Easy to Read: Marathon Vertical Outdoor Thermometer

              Marathon Vertical Outdoor Thermometer
              Marathon Vertical Outdoor Thermometer
              9Outstanding
              Pros
              • Super easy to use

              • Self operate

              • Durable

              • Large number easy to read

              Cons
              • The red line is hard to see from afar

              • Need to swing up and down to settle the liquid

              A thermometer that looks classic, and is easy to read just the temperature? Here it is.

              Looking right to the meter, you can read the number right away from a distance. The thermometer shows temperature in both F and C. It can measure up to 120 degrees in Fahrenheit and 50 degrees in Celcius.

              This meter is quite large. It requires no setup or buttons to operate. All you do is mounting it on a wall and see how it works.

              I actually taught my kids to read the temperature on this unit. Also, I got one for my parents, who are low-tech people. They hang it near the entrance to check the temp every time they go outside.

              More than that, this meter is a great decoration item that matches any style. It’s white and big, making a great highlight complimenting your living space.

              Marathon Vertical Outdoor Thermometer Specifications

              Dimensions

              17.3 x 3 x 2.9 inches

              Outdoor Temperature Range

              -40°C/-40°F to 50°C/120°F.

              Remote Range

              No remote

              Highlight Features

              Made to be durable to stand outside. Large numbers are shown in both F and C

              Verdict

              The thermometer is not only a measurement tool, but it’s also a nice-looking home decor item.

              Best for A Shadier Location: AcuRite 00424CA Digital Thermometer with Indoor/Outdoor Temperature

              AcuRite 00424CA Digital Thermometer with Indoor/Outdoor Temperature
              AcuRite 00424CA Digital Thermometer with Indoor/Outdoor Temperature
              8.8Great
              Pros
              • Monitor in low temperature

              • Sensor reads every 30 seconds

              • Integrated clock

              • Easy to install

              Cons
              • No backlight

              • Need to get close to read

              Love this meter because it has a clock in there. You know everything is better with a clock.

              I got this unit when getting ready for a big chill storm coming through the region. This thing can track temp down to negative 40 degrees Fahrenheit.

              It’s super easy to set up. You just need to install the double battery in the outside sensor and 2 AAA batteries in the meter. One important thing is when you work on an outside environment anywhere under 4 degrees, you’ll need to switch to lithium batteries. Because the other batteries will die almost instantly.

              The sensor works especially well in a cold environment, thus making it functional in shadier locations. It has a LED light to show you that the batteries are still good.

              One thing to notice about the wireless sensor is it works on the signal strength of 433 Megahertz. On average, it takes you about 50 meters or 165 ft depending on your building materials. If you live in a subterranean house or a cinderblock, it might be less than regular wood construction.

              AcuRite 00424CA Digital Thermometer with Indoor/Outdoor Temperature Specifications

              Dimensions

              4.2 x 1.4 x 2.2 inches

              Outdoor Temperature Range

              Down to -40F

              Remote Range

              165 feet

              Highlight Features

              The sensor works well outside reads accurate temp indoor and outdoor

              Verdict

              This unit works both inside and outside. The temperature shown is quite accurate in cold weather and in shades.

              Easy to Set Up: AcuRite 00782A2 Wireless Indoor/Outdoor Thermometer

              AcuRite 00782A2 Wireless Indoor/Outdoor Thermometer
              AcuRite 00782A2 Wireless Indoor/Outdoor Thermometer
              8.6Great
              Pros
              • Precise sensor

              • Monitor indoor and outdoor

              • Convenient fold-out stand to stand anywhere

              • Keyhole for positioning on a wall

              Cons
              • Battery life is not reasonable

              • Only show in Fahrenheit

              Want to avoid the hassle of installation? This AcuRite is just what you need.

              It comes with two parts. One is the temperature indicator; the other is the sensor. Just basic units to show you the indoor and outdoor temperature.

              What makes these devices easy to set up is the design to sit on up like an alarm clock. You can place it anywhere that fits your eyes.

              This thermometer features a precise thermistor that can measure temp as low as -40 degrees. The number updates every 60 seconds from up to 100 ft.

              Though the device is compact, the displayed numbers are big enough to read without getting close.

              However, the only thing I don’t appreciate about this meter is it doesn’t support Centigrade. If you are more familiar with Fahrenheit, it’s a worth buying unit.

              Also, at low temperature, the device needs lithium batteries to operate.

              AcuRite 00782A2 Wireless Indoor/Outdoor Thermometer Specifications

              Dimensions

              1.5 x 4 x 6.6 inches

              Outdoor Temperature Range

              Down to -40 degrees

              Remote Range

              100 feet

              Highlight Features

              Simple design with wireless operation. Monitor both indoor and outdoor temperature

              Verdict

              This is my favorite thermometer that I placed in the kitchen. I can now read how the weather is without running to the living room.

              Sleek Design: Wittime Latest 2079 Wireless Indoor Outdoor Thermometer

              Wittime Latest 2079 Wireless Indoor Outdoor Thermometer
              Wittime Latest 2079 Wireless Indoor Outdoor Thermometer
              8.4Good
              Pros
              • Super attractive design

              • Easy to read screen

              • Forecast weather

              • High-precision sensor

              • Flexible in any living space

              Cons
              • The wireless sensor is not waterproof

              • Battery consuming

              Ok, I can’t wait to introduce this Wittime. It matches my boy’s interest in decorating his room with science-fiction objects.

              First, I have to mention the display layout with an infinity screen that can be customized with themes. At the bottom is the clock with alarm mode. That means you can use the meter as a bedroom decoration.

              The second impression is the touchscreen on the HD display. On top, it can show multiple channels of temperature if you connect with more than one sensor.

              You can also check the humidity as well as weather forecast through the change of pressure. It can tell whether it’s sunny, cloudy, rainy, storm, or snow.

              The backlight can also change to your liking. You can set it up at light, dark, or off. The gadget looks quite like a futuristic item that attracts attention from any guest that comes to my home.

              Wittime Latest 2079 Wireless Indoor Outdoor Thermometer Specifications

              Dimensions

              3.5 x 2.4 x 5 inches

              Outdoor Temperature Range

              Indoor: 14.2°F ~ 122°F

              Outdoor: -40 to 158 °F

              Remote Range

              328 feet

              Highlight Features

              HD display, touchscreen, handsomely design. Features clock with alarm and customized theme

              Verdict

              This hygrometer is a real highlight in my home as well as a reliable weather station that my son loves.

              Best for Monitoring Multiple Zones: ORIA Indoor Outdoor Thermometer

              ORIA Indoor Outdoor Thermometer
              ORIA Indoor Outdoor Thermometer
              8Good
              Pros
              • Multiple channel readouts

              • Convenient max and min record

              • Easy to set up

              • Auto-off backlight

              Cons
              • Hard to read at first

              This ORIA thermometer features 3 separate wireless sensors to read the weather in multiple zones.

              On the large display screen, it shows readouts of the temperature outside and humidity simultaneously.

              Besides, I found the max and min record feature is really helpful. It updates data every 60 seconds. Also, the backlight will turn off after 5 seconds if you don’t perform any action on the device.

              What’s great is this gadget has an easy button to toggle between C and F. You can set it up in either unit for easy tracking.

              You can hang this unit on the wall or let it stand on a tabletop. The unit is designed to match any decoration style.

              When using this thermometer, it took me a bit of time to get familiar with the screen and numbers on it. But once the tough time is through, you will how handy it is.

              ORIA Indoor Outdoor Thermometer Specifications

              Dimensions

              4.8 x 3.6 x 2.9 inches

              Outdoor Temperature Range

              Indoor: 0 - 60℃;

              Outdoor: -40 - 60℃

              Remote Range

              100M/328ft

              Highlight Features

              Come with 3 sensors for 3 channels. Easy to read display. Fast humidity and temperature update

              Verdict

              This is an ideal thermometer for those who want to monitor temperature os different areas of the house.

              How To Choose The Most Accurate Outdoor Thermometer?

              Now, even you’re hungry for a new thermometer, don’t rush to buy one. You need to know what criteria you should look at to obtain the most appropriate meter. I’m telling you now.

              How Easy Is It to Read?

              Sometimes, it’s frustrating to skip a moment and walk to check the current temperature. So, I always prefer devices with large numbers. However, you should know that a large display screen is overpowering.

              A smaller screen doesn’t mean you can’t see anything. A thermometer in your bedroom may not necessarily come with a large screen. If you buy the meter for someone with seeing ability, a bigger screen is better.

              How Far Can The Remote Sensor Reach?

              You want to care how far you can position the indoor part away from the outdoor sensor so that it can transmit correctly. Some models can be placed up to more than 400 feet off each other. But keep in mind that solid wall and wireless signals can affect the range.

              Also, pay attention to the period the sensor transfers data. Ideally, every 30 seconds is best. You should try to place the meter in different positions to determine the best one for the range.

              What Unit Is It Show?

              I was more familiar with Celcius, but the meter I bought was displaying in Fahrenheit. There was no switch to C, so I had to learn how to read F-degree. It was not real pain but a bit hassle. So, you should be careful reading the review to see if the device shows in the unit you know.

              It’s also a plus to have a dual-unit reading thermometer. You can set the outdoor meter to Celcius during the indoor to Fahrenheit, vice versa. That way, you can learn how to read in both units. It will come in handy when you travel to another country.

              Features

              Some high-end thermometers have a touchscreen, which is a nice feature to have. But it may consume batteries faster. The weather forecast is also great to have. It uses air pressure to predict climate change in the next 24 hours. You can rely on that feature to plan ahead of your day.

              Additionally, there are features like reading wind speed and direction. If you are a sailer, consider having those readings on the meter.

              Which Brands Make The Most Accurate Outdoor Thermometer?

              AcuRite

              AcuRite is my favorite weather monitor brand. It is a family-owned business founded in 1943. The company was one of the most reputable brands of quartz clocks in 1987, and now they are famous for the most reliable weather products. AcuRite stands out for their advanced and up-to-date technology, ultimately serving the need to check the weather and beyond.

              ThermoPro

              ThermoPro specifies themselves in manufacturing thermometers with a professional end. The brand owns the passion and innovation that guarantee only satisfaction. With a number of quality thermometers in the collection, ThermoPro is there to serve a wide range of demand and customer’s interests.

              FAQs

              Where is the best place to hang an outdoor thermometer?

              It’s best not to place the device in direct sunlight. You should find or provide shade for the meter and place it ideally 6 feet above the air. The area should have sufficient airflow and be away from rain, ice, and snow.

              How do you calibrate an outdoor thermometer?

              To calibrate an outdoor thermometer, you can make an ice bath using a cup, crushed ice, and cold water. Filling the cup to the top with ice to achieve a stable temperature. Note that if you use cubeb ice, it may have higher temperature readings.

              Slowly add cold water until the water line is about half an inch below the surface of the ice. Don’t add water to float the ice. With much water, the freezing point will not be achieved. If the ice starts to float, pour out some water.

              Let the ice bath sit for about two minutes, allowing the temperature to stabilize. Place the probe of the thermometer in the middle of the ice bath. Stir the unit gently in the middle of the cup for 15 seconds while making the probe tip submerged. Make sure it won’t touch the sides or the bottom of the cup. Locate, press, and hold the Cal button for two seconds, then release when the word Cal appears flashing on display.

              When it’s done with calibrating, the screen should now read 32 degrees Fahrenheit or zero Celsius. Note that it can be slightly above or below this reading, depending on the accuracy of the unit.

              How does outdoor thermometer work?

              Conventionally, an outdoor thermometer consists of a glass tube filled with mercury. This liquid will rise according to the temperature.

              Digital thermometers, on the other hand, is equipped with a small computing mechanism and a resistor. The sensor in it catches the change in temperature and indicates a digital readout in degrees.

              How long does it take a thermometer to stabilize?

              The answer relies on the thermal conductivity, the thermal mass of the material, and the probe. For a glass thermometer, it takes around 2 minutes on the average. A metal thermocouple thermometer takes a bit longer, about 3 minutes.

              Conclusion

              I really don’t know how many thermometers I have used. But each one left me a certain impression of its best. That’s how I’m able to select the most accurate outdoor thermometer and pile this list. I hope you have found a meter for yourself. Don’t forget to let me know and drops comments if you have any questions. Ciao!

              Harry Ramos
              Harry Ramos

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