Mill Valley in August
Great time to visit
August extends the perfect summer weather with warm, dry days ideal for hiking and outdoor dining. Still peak season pricing, but those cloudless skies make it hard to complain.
Weather
August continues the dry, warm pattern with daytime highs in the low 80s and pleasant nights around 60°F. The marine layer becomes less predictable, sometimes staying offshore for days. Zero rainfall is typical.
27°C high15°C low0 rain days
Crowds & Cost
peak crowds
~$290/day average
Events & Festivals
- •Mill Valley Wine Walk
- •End-of-summer concerts at Old Mill Park
- •Perseid meteor showers viewing events on Mount Tam
August Tips
- •Bring extra water for hikes - temperatures can spike inland
- •Book spa treatments early at hotels like Acqua Hotel
- •Consider mid-week visits to avoid weekend crush
All Months
April through October gives you the best weather in Mill Valley. Summer means no rain but also means fog that rolls in most afternoons — pack layers even in July. May and September hit the sweet spot with warm days and clear skies. The Mill Valley Film Festival happens in October, bringing crowds and higher hotel rates. Winter brings rain that can last for days, but also fewer tourists and green hills that photographers love. Spring wildflowers bloom best in March and April along the Dipsea Trail. Avoid Memorial Day and Labor Day weekends unless you enjoy fighting for parking spots.
Mill Valley Scores
Solo
6/10
Couples
7/10
Families
8/10
Adventure
6/10
Budget
4/10
Luxury
6/10
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