2d20 weather
1-9 default: good weather, meaning some clouds, no wind, no rain
10 mist (if stacked: fog)
11-12 rain or snow
13-14 cloudy (can't see the sun; lowers heat)
15-16 sunny (increases heat)
17-18 windy
19 grey skies, thunderstorm in the distance (if stacked: thunderstorm at location)
20 roll twice more
The results stack. For example, if you get "default" and "rainy", it's just rainy. If you get "rainy" and "rainy", for example, that's heavy rain. Stacking good weather means excellent weather.
If you get three 19s, use a natural disaster instead of a thunderstorm (choose what fits best or roll 1d4: tornado, seismic activity, heat wave, flash flood). Elementals of the relevant type might show up.
Cloudy and sunny together means temperature changes frequently.
Revisited on 08/10/19:
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