how to calibrate the temp? My unit is 9 degrees off. From reading previous posts this seems to be a common problem.

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  • Updated 5 months ago
Are all these units defective?
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Matt Loganbill

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Posted 5 months ago

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George D. Nincehelser

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You shouldn't have to calibrate that much.  If you're more than a few degrees Fahrenheit off, you should look at other possibilities first. 

First, what is your mounting like?  Are you too close to a hot roof, for example?  Sometimes posting a picture will help speed things along.

Also, when you're comparing your temp to other sources, you need to be sure the sources you are using are reasonably representative of your location.

There's always the possibility the unit is defective, of course.  If that's the case, it would be better to have it fixed (assuming it's under warranty) than to try to "fix" it via calibration.
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AcuRite Rachell, Employee

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Hello Matt,

I do agree with George regarding mounting, where do you have the sensor mounted? The accuracy standard is +/-2° per unit. If you are comparing this sensor side by side with your display you should read within 4°. If you are reading outside the accuracy standard, please verify you are following the battery recommendations and troubleshooting steps listed below. This model does not have a calibration option.  Please let us know if you continue reading outside the accuracy standard. Thank you.


•Verify you are using fresh alkaline batteries or lithium batteries (when temperature is below -4°F/-20°C) in sensor.

•Quality brand batteries are recommended, including Duracell, Rayovac, Energizer, or Kirkland.

•Verify batteries are fresh. The battery expiration date should be at least 6 years out. Batteries can lose 3% power or more every year in storage.

•Heavy duty, extra strength or generic / store brand batteries are not recommended for use with AcuRite products because they may cause performance irregularities due to the way these types of batteries disperse power. Each battery should not exceed 1.6 volts.

•Rechargeable batteries are not recommended for use with AcuRite products because they may cause performance irregularities due to the voltage instability of these types of batteries.

•Mixing different battery types (brands, old/new, etc.) is not recommended.

Hard reset:

- Bring both units side by side and remove all batteries, unplug display if it has an ac adapter

- Change the ABC Switch to a different setting and ensure that both are on the same setting. example - If on A, move both to C

- Place batteries into the outdoor sensor first

- Place batteries into display

- Allow units to sit side by side until they connect.