Mill Valley (CA) Weather and Climate: A Comprehensive Guide
Temperatures see a moderate degree of fluctuation,
transitioning from warm conditions
to mild.
It receives mid-range precipitation levels.
Now, let’s break down all the climate details for a clearer picture.
Average maximum day and minimum night temperature
In Mill Valley, seasonal changes bring about a moderate variation in temperatures. Average maximum daytime temperatures range from a comfortable 24°C in September, the warmest time of the year, to a moderate 14°C during cooler months like January.
At night, temperatures typically drop to an average of around 6°C during these months. Check out our detailed temperature page for more information.Temperature ranges by month
Precipitation and rainy days
Generally, Mill Valley experiences moderate precipitation patterns, averaging 774 mm yearly. Significant seasonal changes in precipitation occur throughout the year. During the wetter season, December receives heavy rainfall, averaging 172 mm of precipitation, recorded across 13 rainy days. In contrast, the drier season, July brings less rainfall, with 0.3 mm over 0 rainy days. For more details, please visit our Mill Valley Precipitation page.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
Seasonal changes in sunshine hours are quite dramatic in Mill Valley. While May receives considerable daily sunshine with up to 10.8 hours, December marks the darkest time of the year, where sunshine is scarce with only 5.3 hours of sunlight per day. Visit our detailed sunshine hours page for more information.Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Average humidity
The relative humidity is high throughout the year in Mill Valley.
The city experiences its highest humidity in January, reaching 80%. In June, the humidity drops to its lowest level at 71%. Explore our detailed page on humidity levels for further details.
Relative humidity over the year
broken clouds and rain overcast and chance of rain partly cloudy and rainForecast for Mill Valley (CA)
4 m/s
4 m/s
8 m/s
The best time of year to visit Mill Valley in the United States of America
During the months of June, July, August, September and October you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
Yes, the months of May, June, July, August and September are very dry.
September has an average maximum temperature of 24°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of 14°C.
December tops the wettest month list with 172 mm of rainfall.
July is the driest month with 0 mm of precipitation.
May is the sunniest month with an average of 324 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
