The OpenWeatherMap .NET SDK by Bond-009 allows developers to use the OpenWeatherMap APIs to integrate current and forecast weather conditions into their .NET applications. This SDK supports .NET framework 4.5+.
Weather Underground will retire its API at the end of 2018. Weather Underground was acquired by The Weather Company in 2012. The Weather Company was acquired by IBM in 2015. Now, IBM infrastructure is better suited to meet the enterprise-grade demands of the Weather Underground developer community.
Windy, a popular weather forecasting app, is urging all developers to migrate to Windy API v4.0. The company will discontinue v3.0 October 31, 2018 (at the latest), and v2.3 on November 30, 2018. v4.0 is already available and it is the only API the company will support moving forward.