When to go · Mill Valley
Mill Valley in September
Great month. Inside Mill Valley's best window: Apr–Jun, Sep–Oct.
Key facts
- Verdict
- Great
- Temperature
- 24°C (75°F)75°F (24°C) / 12°C (54°F)54°F (12°C)
- average high / low
- Rain days
- 2
- Crowds
- Medium
- United States overall
- Prices
- Medium
- United States overall
Verdict
Inside Mill Valley's best window: Apr–Jun, Sep–Oct.
Is another month better than September?
No other month rates higher than September for Mill Valley in this guide.
Weather in September
- Mill ValleyHighs around 24 °C (75 °F), lows around 12 °C (54 °F), rain on about 2 daysHighs around 75 °F (24 °C), lows around 54 °F (12 °C), rain on about 2 days
Festivals and holidays
Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.
Labor Day big impact
1st Monday of September · United States
End of summer; last big road-trip weekend.
Crowds and prices
- Crowds · United States overall
- Medium
- Prices · United States overall
- Medium
United States overall: After Labor Day the crowds drop and parks stay open; Florida and the Gulf are at hurricane peak.
Compare two months
Weather, crowds and prices for any two months in Mill Valley, side by side.
Verdict
Sep: Great
Apr: Great
Daytime high
Sep: 24 °C (75 °F)75 °F (24 °C)
Apr: 19 °C (66 °F)66 °F (19 °C)
Night low
Sep: 12 °C (54 °F)54 °F (12 °C)
Apr: 8 °C (46 °F)46 °F (8 °C)
Rain days
Sep: 2 (better)
Apr: 6
Crowds
Sep: Medium
Apr: Medium
Prices
Sep: Medium
Apr: Medium
Festivals listed
Sep: 1
Apr: 1
September: Inside Mill Valley's best window: Apr–Jun, Sep–Oct.
April: Inside Mill Valley's best window: Apr–Jun, Sep–Oct.
Mill Valley: figures are long-term averages from this guide, not a forecast.
What to pack
- A warm layer for the evenings