ForecastIOMono - Based off of C# Wrapper https://github.com/f0xy/forecast.io-csharp
Works with Mono projects, including Xamarin.IOS, Xamarin.Android and Xamarin.Mac.
Usage:
var ForecastRequest = new ForecastIORequest("[apikey]",[lat],[lon],[unit]);
ForecastIOREsponse Response = ForecastRequest.Get();