The weather could be better here in Fresno for tomorrow's Venus Transit. It's a little overcast and breezy today. A small storm front is moving through and there is a chance of rain tonight. The cloud cover should improve tomorrow but it may still be a little breezy with 18-22 mph winds. Here are some links for the weather at Mauna Kea, Hawaii which is best situated in the US for observing the transit.
Note that Mauna Kea is the northern peak on the island where the observatories are. One can see from the satellite maps that the clouds flow around the volcano.