Popular weather data site Weather Underground (Wunderground) has a new version of its Weather Underground API and two things are notable: its former XML service is being phased out in favor of JSON. And it has a very clear pricing structure, though there's a free version for non-commercial projects.
If you're a developer looking for a weather API, you're probably overwhelmed by the number of options out there. The ClimaCell Micro Weather API has more granular data making it different from the rest. ClimaCell can sense more weather so it can deliver more granular real-time and forecast insights.