Weather by Text
Text your location to 415-xxx-xxxx and receive your current weather conditions and forecast.
I've primarily tested with locations in the United States, but it should work globally as well. (However, it currently only returns in US units for temperature and wind speed.)
2020-11-19: Service turned off due to abuse
2020-06-16: Updated for Python 3.x and fixed geocoding
2019-11-19: Weather by Text Using Twilio and DarkSky.