When to go · San Francisco
San Francisco in April
Good month. Outside the best window (Sep–Oct). Across United States: Good month for the Southwest, Washington cherry blossoms, the South; mountain roads still closed.
Key facts
- Verdict
- Good
- Temperature
- 18°C (64°F)64°F (18°C) / 10°C (50°F)50°F (10°C)
- average high / low
- Rain days
- 4
- Crowds
- Medium
- United States overall
- Prices
- Medium
- United States overall
Verdict
Outside the best window (Sep–Oct). Across United States: Good month for the Southwest, Washington cherry blossoms, the South; mountain roads still closed.
Is another month better than April?
April is rated good. These months rate higher:
Weather in April
- San FranciscoHighs around 18 °C (64 °F), lows around 10 °C (50 °F), rain on about 4 daysHighs around 64 °F (18 °C), lows around 50 °F (10 °C), rain on about 4 days
- 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.
Spring break big impact
March–April · United States
Students fill Florida, Texas and Mexico beaches; parks busy.
Crowds and prices
- Crowds · United States overall
- Medium
- Prices · United States overall
- Medium
United States overall: Good month for the Southwest, Washington cherry blossoms, the South; mountain roads still closed.
Compare two months
Weather, crowds and prices for any two months in San Francisco, side by side.
Verdict
Apr: Good
Sep: Great (better)
Daytime high
Apr: 18 °C (64 °F)64 °F (18 °C)
Sep: 24 °C (75 °F)75 °F (24 °C)
Night low
Apr: 10 °C (50 °F)50 °F (10 °C)
Sep: 15 °C (59 °F)59 °F (15 °C)
Rain days
Apr: 4
Sep: 1 (better)
Crowds
Apr: Medium
Sep: Medium
Prices
Apr: Medium
Sep: Medium
Festivals listed
Apr: 1
Sep: 1
April: Outside the best window (Sep–Oct). Across United States: Good month for the Southwest, Washington cherry blossoms, the South; mountain roads still closed.
September: Inside San Francisco's best window: Sep–Oct.
San Francisco: figures are long-term averages from this guide, not a forecast.
What to pack
- A warm layer for the evenings