From the National Weather Service:
The first weekend of June is forecast to be unusually wet.
Nearly all of Northwest California will probably receive some rain this weekend. Some light rain or coastal drizzle will be possible (20% chance) as early as Thursday night and Friday.
Probabilities for a tenth of an inch or more will increase on Saturday, however gusty southerly winds in advance of the front may limit the rain amounts around Humboldt Bay and the greater Eureka area. The highest probabilities for a quarter of an inch or more will occur during the 24 hour period from 5 PM Saturday to 5 PM Sunday. This will be a warm storm with mild temperatures and high snow levels.
If you are planning outdoor activities this weekend, be ready for wet weather conditions and possibly gusty winds.