I've recently been looking for Weather APIs that could provide global UV Index Forecast to integrate some sun safety data into my Android/iOS/Fitbit app (sunscreen recommendation time). That's the list I've come up with so far:
Forecast.io - returns current, minutely, hourly UV Index plus max UV Index for daily forecast data. 1000 req/daily free.
OpenWeatherAPI - it seems returns just max UV Index for the location. Free plan is available.
WeatherBit - returns current, hourly UV Index from 0 to 11+. UV Index is factored in the Earth's tilt, upper atmosphere aerosol concentration, sky opacity, and more. Free plan is available.
OpenUV - seems just appeared recently, claims to return real-time UV Index data and Forecast for any datetime. Factored by ozone from AURA satellite, sun-to-earth distance and elevation (optional). Free plan is there.
Any other good suggestions you could recommend?