I was using Weather Underground 10 years ago, when it was fast and without the bloat. When it was purchased by some other company it became impossible to use and I switched to PWS.
PWS Weather
It's using personal weather stations, so I can check the weather from the station that is 1 km away from me and in the mountains the proximity to the station matters a lot. It still gives different temperatures readouts than my microclimatic valley, but at least the rain forecast matches my observations.
The website is still not bloated and has historical data.