No, it means it is far more likely NOT to rain.
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It means that it will probably rain.
20/30 as a percent = 100*20/30 = 66.66... %
0.20 + 0.80*0.80
There is a 70% chance it will not rain tommorrow! There is a 70% chance it will not rain tommorrow!
There is an 80% or 0.80 chance that it will not rain on Saturday