Mill Valley, CA Weather & Climate Normals
Mill Valley's real weather, in one number
Mill Valley, CA scores 69/100 on this site's reading of NOAA's own 30-year normals: mild with real seasons. A solid stretch of comfortable months alongside a noticeable but not extreme summer or winter. 7 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Mill Valley's hottest and coldest months
Mill Valley's hottest month is Aug, averaging 68°F; its coldest is Dec, averaging 49°F, a 19.2°F swing across the year, one of the smaller gaps in this dataset.
Rain and snow in Mill Valley
Mill Valley averages 44.39in of precipitation a year across roughly 68 days with measurable rain or snow, and 0in of snow a year.
Where Mill Valley ranks
Mill Valley ranks 251 of 4876 US cities in this dataset for comfort score, and 244 of 429 within CA. About 13,904 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from KENTFIELD, CA US, 3.4 miles from Mill Valley, not a prediction for any specific day.
More on how this is worked out
What a 30-year climate normal actually is · Why this uses the nearest NOAA station