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This page covers some of the basic on Nepal: Nepal weather tripadvisor
As it says there as well, it can be useful for all travellers to take a look at Meteorological Forecasting Division of Goverment of Nepal here: Meteorological Forecasting Division of Goverment of Nepal to check the weather before travel.
This is a live web cam from the top of Kala Patthar, so you can see how is the weather like every minutes:
The second gives you the temperature, the umidity, the wind, the pressure:
In here you can have the weather:
Meteorological Forecasting Division
Sattelite images:
Meteorological Forecasting Division Satellite Images
Mountaineering data:
Meteorological Forecasting Division mountaineering
I don't think you can get better than this. You should also copy those contacts so that you can try to call them if you manage to have the necessary equipment at hand.