When to go · Costa Mesa
Costa Mesa in September
Great month. Inside Costa Mesa's best window: Mar–May, Sep–Nov.
Key facts
- Verdict
- Great
- Temperature
- 28°C (82°F)82°F (28°C) / 17°C (63°F)63°F (17°C)
- average high / low
- Rain days
- 1
- Crowds
- Medium
- United States overall
- Prices
- Medium
- United States overall
Verdict
Inside Costa Mesa's best window: Mar–May, Sep–Nov.
Is another month better than September?
No other month rates higher than September for Costa Mesa in this guide.
Weather in September
- Costa MesaHighs around 28 °C (82 °F), lows around 17 °C (63 °F), rain on about 1 dayHighs around 82 °F (28 °C), lows around 63 °F (17 °C), rain on about 1 day
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 Costa Mesa, side by side.
Verdict
Sep: Great
Mar: Great
Daytime high
Sep: 28 °C (82 °F)82 °F (28 °C)
Mar: 22 °C (72 °F)72 °F (22 °C)
Night low
Sep: 17 °C (63 °F)63 °F (17 °C)
Mar: 11 °C (52 °F)52 °F (11 °C)
Rain days
Sep: 1 (better)
Mar: 5
Crowds
Sep: Medium
Mar: Medium
Prices
Sep: Medium
Mar: Medium
Festivals listed
Sep: 1
Mar: 2
September: Inside Costa Mesa's best window: Mar–May, Sep–Nov.
March: Inside Costa Mesa's best window: Mar–May, Sep–Nov.
Costa Mesa: figures are long-term averages from this guide, not a forecast.
What to pack
Nothing unusual for the weather this month.