When to go · Costa Mesa
Costa Mesa, month by month
The best months for Costa Mesa: Mar, Apr, May, Sep, Oct, Nov. Months to avoid: Jul, Aug.
Month by month
- JanuaryMixedOutside the best window (Mar–May, Sep–Nov). Across United States: Cold and snowy north and in the mountains; Florida, Hawaii and the desert Southwest are the picks.21 °C (70 °F) / 9 °C (48 °F), 6 rain days70 °F (21 °C) / 48 °F (9 °C), 6 rain daysCrowds: Low
- FebruaryMixedOutside the best window (Mar–May, Sep–Nov). Across United States: Still winter north; ski season in the Rockies; Presidents' Day weekend busy. Mardi Gras in New Orleans (date varies).21 °C (70 °F) / 10 °C (50 °F), 6 rain days70 °F (21 °C) / 50 °F (10 °C), 6 rain daysCrowds: Low · 1 festival or holiday
- MarchGreatInside Costa Mesa's best window: Mar–May, Sep–Nov.22 °C (72 °F) / 11 °C (52 °F), 5 rain days72 °F (22 °C) / 52 °F (11 °C), 5 rain daysCrowds: Medium · 2 festivals or holidays
- AprilGreatInside Costa Mesa's best window: Mar–May, Sep–Nov.23 °C (73 °F) / 12 °C (54 °F), 3 rain days73 °F (23 °C) / 54 °F (12 °C), 3 rain daysCrowds: Medium · 1 festival or holiday
- MayGreatInside Costa Mesa's best window: Mar–May, Sep–Nov.24 °C (75 °F) / 14 °C (57 °F), 1 rain days75 °F (24 °C) / 57 °F (14 °C), 1 rain daysCrowds: Medium · 1 festival or holiday
- JuneGoodOutside the best window (Mar–May, Sep–Nov). Across United States: Rockies and northern parks open; desert heat builds; hurricane season starts. Book parks months ahead.25 °C (77 °F) / 16 °C (61 °F), 1 rain days77 °F (25 °C) / 61 °F (16 °C), 1 rain daysCrowds: High
- JulyAvoidListed as a month to avoid: Jul–Aug (fair crowds, heat), Thanksgiving–New Year (mall traffic).28 °C (82 °F) / 18 °C (64 °F), 0 rain days82 °F (28 °C) / 64 °F (18 °C), 0 rain daysCrowds: High · 1 festival or holiday
- AugustAvoidListed as a month to avoid: Jul–Aug (fair crowds, heat), Thanksgiving–New Year (mall traffic).29 °C (84 °F) / 18 °C (64 °F), 0 rain days84 °F (29 °C) / 64 °F (18 °C), 0 rain daysCrowds: High
- SeptemberGreatInside Costa Mesa's best window: Mar–May, Sep–Nov.28 °C (82 °F) / 17 °C (63 °F), 1 rain days82 °F (28 °C) / 63 °F (17 °C), 1 rain daysCrowds: Medium · 1 festival or holiday
- OctoberGreatInside Costa Mesa's best window: Mar–May, Sep–Nov.26 °C (79 °F) / 15 °C (59 °F), 2 rain days79 °F (26 °C) / 59 °F (15 °C), 2 rain daysCrowds: Medium
- NovemberGreatInside Costa Mesa's best window: Mar–May, Sep–Nov.23 °C (73 °F) / 11 °C (52 °F), 4 rain days73 °F (23 °C) / 52 °F (11 °C), 4 rain daysCrowds: Medium · 1 festival or holiday
- DecemberMixedOutside the best window (Mar–May, Sep–Nov). Across United States: Holiday lights in New York, ski season opens; flights and hotels peak around Christmas and New Year.21 °C (70 °F) / 8 °C (46 °F), 6 rain days70 °F (21 °C) / 46 °F (8 °C), 6 rain daysCrowds: High · 1 festival or holiday
Compare two months
Weather, crowds and prices for any two months in Costa Mesa, side by side.
Verdict
Mar: Great
Apr: Great
Daytime high
Mar: 22 °C (72 °F)72 °F (22 °C)
Apr: 23 °C (73 °F)73 °F (23 °C)
Night low
Mar: 11 °C (52 °F)52 °F (11 °C)
Apr: 12 °C (54 °F)54 °F (12 °C)
Rain days
Mar: 5
Apr: 3 (better)
Crowds
Mar: Medium
Apr: Medium
Prices
Mar: Medium
Apr: Medium
Festivals listed
Mar: 2
Apr: 1
March: Inside Costa Mesa's best window: Mar–May, Sep–Nov.
April: Inside Costa Mesa's best window: Mar–May, Sep–Nov.
Costa Mesa: figures are long-term averages from this guide, not a forecast.