We've got another thread here somewhere blaming the widgets.
I use Transparent weather by Droid27 myself.
Last week, the three weather APIs he using all blocked at once due to an overload - they've come back but still aren't right yet.
And mine said 39° this morning when I was peeling off my jacket and rolling up my sleeves.
It's just jumped to 60 and that's right.
It's not the dev or just his widgets, this is affecting a lot of others. I expect the situation to clear up before long.
AccuWeather, usually not the greatest, seems to have been stable throughout the drama - go figure.
Anyway - I always add alternative weather touches to the Transparent widget.
Fwiw, I like to have Radar Now from my date/month and Wunderground from the minutes. Sometimes my built-in AccuWeather but srsly, Wunderground is really good.
Check out "Weather Underground"
https://play.google.com/store/apps/details?id=com.wunderground.android.weather