It's significantly less user-friendly, but there's always https://www.weather.gov/ (if you live in the US).

I like weather.gov but it doesn't show the "next hour" precipitation prediction that I like from dark sky.

In the UK, I use netweather which has an atrocious UI, but displays the raw radar data on a 180 meter grid. Using that and a regular untrained eyeball just looking at how the rain is forming seems to make far better predictions.

Whereas darksky seems to use a 1km+ grid and very crude predictions like 'the rain will move in the same direction as the wind'.