Pretty cool site for weather reports:
http://forecast.io/#/f/-1.2835,36.8238

One of the dataset source used by forecast.io is available for free from NOAA.
Just click through the default options:

Looks like Kitui is going to have 5 days of precipitation.
 http://1.usa.gov/YHQej0

Nairobi
http://1.usa.gov/YeCpvH
http://ready.arl.noaa.gov/readyout/8905522_metgram.gif


This could be a very cool service to provide to farmers.
 - Get data from GFS (http://en.wikipedia.org/wiki/Global_Forecast_System)
 - Have a farmer register for this service via SMS.
 - Provide a query interface or alert interface over SMS.