Those 100% chance of rain predictions, just mean it "will" rain at some time.
It does not necessarily mean it will rain 100% of the time.
Prepare for the worst, hope for the best
But don't stay home
Life's A Journey
It's not to arrive safely at the grave in a well preserved body,
But rather to skid in sideways, totally worn out, shouting,
Woo Hoo!....What a Ride!