Your forecast leaves out one of the more...interesting cRPG weather conditions:
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Never had it rain with sun before? You live a sheltered life! I've had it snow, rain, hail, be windy as hell and sunny all in the course of a few hours. And just because nature is a bitch, rain and sun at the same time, just to make everything wet when you're in the woods.
The fog is awesome, makes being sneaky rewarding and fun. The rain not so much because of how drastically it reduces movement speed. Possible to have it set it to scale the movement so when it first begins to rain, it's only minor but builds up?