Costa Mesa, California 7-day weather forecast
Monday 9 November 2026 | 02:51
21°
Clear sky
Feels like 20°
- High
- 30°
- Low
- 13°
- Humidity
- 47%
- Wind
- 5 km/h
7-day forecast
14 daysHourly forecast
DetailsCosta Mesa rain radar
Temperature and rain / Costa Mesa
The coming days
High
30°
Low
13°
Average high
24.1°
Average low
17.9°
Total rain
85.5 mm
Average rain
5.7 mm
Air quality - Costa Mesa
Particles and ozone
Good
9.50 µg/m³
0-1212-3535-5555+
The air is clean: enjoy the outdoors.
PM109.80µg/m³
Ozone49µg/m³
Data updated hourly
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Frequently asked questions
Quick answers about the weather in Costa Mesa
Tomorrow in Costa Mesa, expect Few clouds 🌤️, with:\n\n- High of 29°\n- Low of 17°
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Our data is updated regularly to give you the most reliable forecast.
Last updated: 2026-11-09