Reliable Weather API?

I know this is a little off-topic so I hope it’s okay. I’ve been working on an air quality app and I wanted to include the current temperature at each location that I specify.

There are a bunch of weather APIs that I’ve tried: openweathermap (inaccurate values as much as 20° off), weatherbit (seems to be offline frequently), (I forget what the issue was… maybe offline?)

Does anyone have a reliable API that they use for current weather data?