I don't think it's open source, but I've used weawow for several years now, and it doesn't have ads. They have a website which looks very similar to what the app displays: https://weawow.com/ It also has widgets that you can put on your home screen.
I was looking for a weather app and I found Breezy Weather which seems to work fine for what I need it for. Can't be sure if it is what you're looking for, but might be worth a look.
RadarScope for radar. The free version is still super powerful. weather.gov website for forecasts and weather info.
Its funny, so many services just take NOAA's weather data and predictions, pile their own predictions on top then sell that as a premium offering, and end up less accurate than if you just go straight to the source and get your forecasts from weather.gov
Not open source, but i've been happy with weawow. Free and ad-free.
I know this deviates from your question a bit so I am apologizing up front (the sovcit posts that I love have made me wanna deviate)... I really like wunderground. I hate that IBM bought them though but it's probably to monetize their trove of weather data. they have access to private weather stations, great viz of weather data by the hour, history to the day, etc. I use nextdns.io to block ads to the best of my ability but I know there is some device info they collect. It does have a rubust section on opting out and deleting tracking data. I don't see lighting tracking regretfully. It's worth trying out. The website can show lighting BTW.
Fellow wonderground user, I second the recommendation. Their weather model is pretty good and I paid the small yearly subscription price so no ads.
Note that IBM sold them, that's why you haven't seen the IBM logo on the loading slash screen again.
Ooh.... That is good news. Thank you. Screw Big Blue.
I like OSS Weather
You thought weatherbug was a good standard? That app is the butt of our jokes about bad weather apps.
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