A free program for Android, by Met Office.

With this app, you can:

Find out what the weather is like in your area in seconds, minutes, hours, or days. Check the latest forecasts for major cities around the world. See what the temperature is and what the forecast looks like for the next day or the rest of the week. Check the latest national and international warnings and alerts for extreme weather. Find out what the wind speed is and how windy it is. Know when it’s going to rain, snow, be sunny, or be cloudy. Use the app to find out what the air quality is like in your area.