When to go · San Francisco
San Francisco in September
Great month. Inside San Francisco's best window: Sep–Oct.
Key facts
- Verdict
- Great
- Temperature
- 24°C (75°F)75°F (24°C) / 15°C (59°F)59°F (15°C)
- average high / low
- Rain days
- 1
- Crowds
- Medium
- United States overall
- Prices
- Medium
- United States overall
Verdict
Inside San Francisco's best window: Sep–Oct.
Is another month better than September?
No other month rates higher than September for San Francisco in this guide.
Weather in September
- San FranciscoHighs around 24 °C (75 °F), lows around 15 °C (59 °F), rain on about 1 dayHighs around 75 °F (24 °C), lows around 59 °F (15 °C), rain on about 1 day
- California coast, United States · San Francisco, Los Angeles, San Diego, Big Surbest weather
Mild all year; San Francisco is foggy and cool in summer; wildfire smoke possible June–November; winter storms can close Highway 1 at Big Sur.
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 San Francisco, side by side.
Verdict
Sep: Great
Oct: Great
Daytime high
Sep: 24 °C (75 °F)75 °F (24 °C)
Oct: 22 °C (72 °F)72 °F (22 °C)
Night low
Sep: 15 °C (59 °F)59 °F (15 °C)
Oct: 13 °C (55 °F)55 °F (13 °C)
Rain days
Sep: 1 (better)
Oct: 3
Crowds
Sep: Medium
Oct: Medium
Prices
Sep: Medium
Oct: Medium
Festivals listed
Sep: 1
Oct: 0
September: Inside San Francisco's best window: Sep–Oct.
October: Inside San Francisco's best window: Sep–Oct.
San Francisco: figures are long-term averages from this guide, not a forecast.
What to pack
Nothing unusual for the weather this month.