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Allmetsat
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A good site where you can find weather forecasts, trajectories of cyclones and hurricanes, statistics and satellite images.
World Metereological Organization
Lingua: 
 
 
Interesting to see the statistics of average temperatures in each country/city, you can also see the statistics of rainy days each month of the year.
Il Meteo
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Weather forecast around the world.
3bmeteo
Lingua: 
  
Weather forecast around the world.
Weather Online
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Weather forecast around the world.
The Wheater Channel
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Weather forecast around the world.
Weatherbase
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Find the weather forecast, climatic averages of 41,997 cities worldwide.