Weather Stationary

An exact reading is all that you are looking for when using a thermometer.  Your AcuRite outdoor thermometer may, after some time, give less accurate data.  If this is the case, you may need to reset AcuRite thermometer to provide the most up-to-date recordings.

In this article, we’ll show you how to reset an AcuRite outdoor thermometer and address some other common problems.

For an indoor thermometer/hygrometer, let the sensors adjust to the new room for around three hours. 

If you are still getting an inaccurate reading on an AcuRite analog thermometer, you must turn the knob on the back of the unit to adjust it.

If you are using a digital model the process is slightly more complicated and we will address it fully later.  

For now, you will need to adjust the slotted fine potentiometer or nut until you have the correct temperature.  Then press the reset button.

AcuRite 00613 Digital Hygrometer & Indoor Thermometer Pre-Calibrated Humidity Gauge, 3' H x 2.5' W x 1.3' D, Black

Test Your AcuRite Outdoor Thermometer For Accuracy

Fill a container with crushed ice and add water to fill it. Give it a stir and let it sit for a few minutes.  Add the thermometer sensor into the container for at least 30 seconds.  It should read 32 degrees F and if so you are good to go.  This test also gives you a great indication of exactly how inaccurate readings are before you reset. 

So, how do I reset my AcuRite outdoor thermometer?  The reset button is located within the battery compartment.  Press and hold the button for a couple of seconds.  After a reset, it will take around 4 hours for readings to appear after you replace the batteries.  You will also need to enter the date and time after a reset.

If your unit is flashing, it means that there is some kind of wireless interference. 

How To Adjust An AcuRite Outdoor Thermometer

For digital display outdoor temperature and humidity calibration, you can do this on the display.  To get to adjustment mode, press and hold the -, SET, and + at the same time for no less than 5 seconds.

How To Reset An AcuRite Iris?

As with all AcuRite weather stations, AcuRite Iris incorporates an outdoor thermometer.  If the sensor is not connecting to the display screen use these reset steps. 

Signs of the sensor not interfacing with the screen could include:

  • No outdoor temperature.
  • The outdoor temperature doesn’t change.
  • No wind speed.
  • Inaccurate wind speed.
  • The outdoor humidity of 1%.

Rainfall not recorded or inaccurate

Inaccurate outdoor temperature

AcuRite Iris (5-in-1) Professional Weather Station with High-Definition Display, Built-In Barometer, and AcuRite Access for Remote Monitoring and Alerts, Compatible with Amazon Alexa, Black (01151M)

Check these things before attempting to hard reset AcuRite thermometer:


  1. Confirm that the A-B-C switch of both the screen and sensor are on the same letter.  These are located in the battery compartments of the sensor and display.  It doesn’t matter which letter you choose as long as they are the same on both.
  2. Try another position for either the sensor array or the display unit.  Under ideal conditions, the models can be up to 330 ft (100 m) of one another.
  3. Keep 3 feet (.9 m) from gadgets that might meddle with remote correspondence (like TVs, microwaves, PCs, and whatnot.
  4. Make sure you use standard alkaline batteries.  AcuRite does not recommend rechargeable or heavy-duty batteries for its products.  Lithium batteries are recommended for the sensor in temperature below – 4ºF/ – 20ºC. 
  5. It will take 5 minutes after replacing the batteries to synchronize the sensor and display unit.

Hard Reset

  • Bring the sensor and screen display together and remove the batteries or power cord.
  • Decide which setting of the A-B-C switch to use and change both to this newsletter.  Press and hold the reset button for about 20 seconds.
  • Add batteries to the outdoor sensor.
  • Re-connect the power cord or replace the batteries in the display unit.  The reset button must be immediately held for 20 seconds if there is one.
  • Keep the units together for 5 minutes or until you see a strong sensor signal.

AcuRite Iris Outdoor Thermometer Inaccurate Temperature Readings 

These apply if your AcuRite Iris with outdoor thermometer or My AcuRite® account is showing wrong or inaccurate outdoor temperature or humidity data. 

Use these steps to correct the following error codes which are often seen when there is corrosion of the wires.

  • -40 degrees
  • 158 degrees
  • 1% humidity
  • 99% humidity

Before dismantling the sensor unit, confirm the following:

  • Are the sensor array and display free from vents or other heat sources?
  • Does the display unit have full signal strength – you should see 4 bars.
  • Make sure both the display and sensor array are clear from any source of moisture.
  • Is the sensor mounted at least 5 ft from the ground?

Once you have confirmed the above and if the error codes persist, you will need to delve a bit deeper into the sensor array.

Remove the 4 screws at the base of the unit and clear any debris and dust.  Check and gently clean all components.  Ensure there is no corrosion or the red and black wires that connect to the temperature/humidity board.  If corrosion is found, this is most likely the reason for the error codes and will need to be corrected. 

AcuRite Outdoor Thermometer Still Not Working?

If you have gone through the above steps and still have issues with an AcuRite outdoor thermometer, contact AcuRite’s U.S.-based support staff.  You can submit a request or chat with their live experts. 

If you have an open ticket with a help specialist, make sure to check your email for a response.  And, check your junk folder.


There are many factors that can affect the accuracy of your AcuRite outdoor thermometer.  From the sensor being in the wrong place, batteries needing replacing, or corrosion occurring in an outdoor sensor array.

This article gives some simple fixes and tests you can do yourself to ensure your AcuRite outdoor thermometer works properly for many years.  Leave a comment below if you found this article helpful.

Read more about AcuRite products in our recent articles.