San Diego in September

Inside San Diego's best window: Mar–May, Sep–Nov.

No other month rates higher than September for San Diego in this guide.

• San DiegoHighs around 25 °C (77 °F), lows around 19 °C (66 °F), rain on about 1 dayHighs around 77 °F (25 °C), lows around 66 °F (19 °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.

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 · 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.

Weather, crowds and prices for any two months in San Diego, side by side.

Nothing unusual for the weather this month.

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