Worldwide WEATHER FORECASTS FOR BICYCLING.
This page allows the user to access cycling weather forecasts everywhere in the world...
Click on the following links for forecasts around France and the British Isles.
Elsewhere, you just need latitude and longitude (in decimal degrees) (link to obtain these data).
N.B: Forecasts are given at mean height within a radius of some tens of kilometers around the chosen point and not necessarily at real height.