I usually go to wunderground.com

accuweather is not too bad on website using desktop but don't bother with the app, it's horrible, ads etc

I always recommend using your country's state weather agency website. It will probably be the most accurate, and you can often get real time readings from the agency's sensors around the country.

In my case, because I live in Spain, I use AEMET.

Weatherspark is great for weather trends and comparing locations. Doesn't do daily forecasts anymore though.

https://www.localconditions.com/

https://www.meteoschweiz.admin.ch/

Y!天気 Not because it's particularly interesting, but it's more accurate than others that I've tried.

the OSS Weather app on Android has been pretty good for me this last year. Seems it's using open-meteo as default provider.