I-405 CA weather conditions near Costa Mesa, California
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Seasoned Weather Conditions
Current Weather Conditions
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7 day weather forecast
Current condition: Clear 70°F 2025-08-25T23:45:00 
Tonight 2025-08-25, Mostly Cloudy. Mostly cloudy, with a low around 68. Southwest wind around 5 mph becoming calm.
Tuesday 2025-08-26, Decreasing Clouds. Mostly cloudy, then gradually becoming sunny, with a high near 80. Light southwest wind increasing to 5 to 10 mph in the afternoon.
Tuesday Night 2025-08-26, Partly Cloudy. Partly cloudy, with a low around 65. Southwest wind around 5 mph becoming calm after midnight.
Wednesday 2025-08-27, Mostly Sunny. Mostly sunny, with a high near 82. Light northwest wind becoming west 5 to 10 mph in the morning.- Wednesday Night 2025-08-27, Increasing Clouds. Increasing clouds, with a low around 66. West wind around 5 mph becoming calm after midnight.
- Thursday 2025-08-28, Partly Sunny. Partly sunny, with a high near 82.
- Thursday Night 2025-08-28, Partly Cloudy. Partly cloudy, with a low around 69.
- Friday 2025-08-29, Decreasing Clouds. Mostly cloudy, then gradually becoming sunny, with a high near 83.
- Friday Night 2025-08-29, Partly Cloudy. Partly cloudy, with a low around 69.
- Saturday 2025-08-30, Becoming Sunny. Partly sunny, then gradually becoming sunny, with a high near 83.
- Saturday Night 2025-08-30, Increasing Clouds. Increasing clouds, with a low around 68.
- Sunday 2025-08-31, Becoming Sunny. Partly sunny, then gradually becoming sunny, with a high near 83.
- Sunday Night 2025-08-31, Increasing Clouds. Increasing clouds, with a low around 67.
- Labor Day 2025-09-01, Becoming Sunny. Mostly cloudy through mid morning, then gradual clearing, with a high near 83.