Costa Mesa, CA Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Costa Mesa, CA in one place.
Sunny, with a high near 79. West wind 0 to 10 mph, with gusts as high as 20 mph.
Local Weather Overview
This forecast page for Costa Mesa, CA is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Aug 21, 2026 5:51 PM PDT.
The active forecast window currently covers Aug 23 to Aug 27, 2026 for Costa Mesa, CA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Aug 23 to Aug 27, 2026
- Latest sync
- Aug 21, 2026 5:51 PM PDT
- Forecast office
- SGX
- Source
- NOAA / NWS
Daily Outlook
This Week in Costa Mesa
Tuesday looks like the warmest upcoming period in Costa Mesa at 81 degrees F.
Sunday Night is the coolest period ahead with temperatures near 71 degrees F.
The strongest winds are forecast for Tuesday at about 0 to 15 mph W.
The forecast from Aug 23 through Aug 27 stays mostly dry.
Forecast Details
- Last updated
- Aug 21, 2026 5:51 PM PDT
- Coverage
- 6 days
- Time zone
- America/Los_Angeles
- Forecast office
- SGX
- Radar station
- KSOX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 71.
Sunny, with a high near 80.
Mostly clear, with a low around 71.
Sunny, with a high near 81.
Mostly clear, with a low around 72.
Sunny, with a high near 81.
Partly cloudy, with a low around 71.
Mostly sunny, with a high near 80.
Partly cloudy, with a low around 71.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Sunday
Aug 23
|
Sunny
|
79°F |
0 to 10 mph
W
|
|
Sunday Night
Aug 23
|
Partly Cloudy
|
71°F |
0 to 10 mph
W
|
|
Monday
Aug 24
|
Sunny
|
80°F |
0 to 10 mph
W
|
|
Monday Night
Aug 24
|
Mostly Clear
|
71°F |
0 to 10 mph
W
|
|
Tuesday
Aug 25
|
Sunny
|
81°F |
0 to 15 mph
W
|
|
Tuesday Night
Aug 25
|
Mostly Clear
|
72°F |
5 to 15 mph
S
|
|
Wednesday
Aug 26
|
Sunny
|
81°F |
5 to 10 mph
SW
|
|
Wednesday Night
Aug 26
|
Partly Cloudy
|
71°F |
5 to 10 mph
S
|
|
Thursday
Aug 27
|
Mostly Sunny
|
80°F |
5 to 10 mph
S
|
|
Thursday Night
Aug 27
|
Partly Cloudy
|
71°F |
5 to 10 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Costa Mesa.
