Ahhh. Refreshing Coastal Weather
The coast redwood forest is cool most times of the year with temperatures ranging from 40 - 70 degrees F or 4 - 21 degrees C. From late October to early May expect rain. Summer months (June-August) can be warmer but it is generally cool and dry. Expect heavy fog in the morning, burning off in the afternoon. Some say fall (August-October) is the best weather of the year. But, don't let the weather stop you from having fun. If you're dressed for the weather and wear sturdy shoes, the giant trees are beautiful all year round.
Click here to see a 7 day forecast of Mill Valley, CA, the closest town to Muir Woods.