Maybe it's just really hot outside. Have you gone out to check? I'd put on some sunscreen first, just in case it's accurate.

Yes but how can you be sure it's wrong? Have you, for example, gone outside?

That’s so fucking hot.

Damned climate change.

I bought a small tabletop atomic clock/thermometer at Radio Shack for $20 when I was 13. I'm in my mid-30s now, and it just died a few weeks ago. I actually mourned it a little, that thing was on my nightstand everywhere I've lived all these years.

climate change is a bitch /s

https://www.lacrossetechnology.com/pages/sensor-finder

EDIT: IIRC, those things use button cells or something, so you might try replacing the battery first.

Welp, looks like it's climate change season again.

70c, in case anyone else couldn’t tell it was failing :)

Do you have the outside part in the sun or shade?

For the outside temperature, ensure the thing's not in direct sunlight. For humidity, try taking the case of the thing apart and gently cleaning the sensor with isopropyl alcohol and a q tip.

Why can it even register a temperature that high? You would think it would cut off somewhere around Death Valley in summer…