Mill Valley in May
Great time to visit
May is Mill Valley at its absolute best - perfect hiking weather and long, sunny days. Just expect to pay premium prices and share those trails with plenty of other people.
Weather
May brings quintessential Mill Valley weather - sunny days in the mid-70s, cool nights around 50°F, and minimal rain. The marine layer creates dramatic morning fog that burns off to reveal crystal-clear afternoons.
23°C high12°C low3 rain days
Crowds & Cost
high crowds
~$260/day average
Events & Festivals
- •Mill Valley Music Festival
- •Memorial Day weekend hiking crowds
- •Marin County Fair begins
May Tips
- •Book accommodations well ahead - this is peak season pricing
- •Start hikes early to beat both crowds and afternoon heat
- •Pack layers for dramatic temperature swings between morning fog and afternoon sun
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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