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Today Hourly 7 days 30 days September
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September 2025 Weather | Costa Mesa, California

Today 9/6
Cloudy Night
Day 81°
Night 64°
0
Sun 9/7
Cloudy Weather
Day 82°
Night 66°
0
Mon 9/8
Cloudy Weather
Day 81°
Night 66°
0
Tue 9/9
Cloudy Weather
Day 75°
Night 66°
0
Wed 9/10
Partly Sunny with Showers
Day 75°
Night 66°
40
Thu 9/11
Cloudy Weather
Day 70°
Night 63°
1
Fri 9/12
Cloudy Weather
Day 72°
Night 64°
1
Sat 9/13
Cloudy Weather
Day 70°
Night 64°
0
Sun 9/14
Cloudy Weather
Day 73°
Night 64°
0
Mon 9/15
Cloudy Weather
Day 75°
Night 63°
0
Tue 9/16
Cloudy Weather
Day 79°
Night 63°
0
Wed 9/17
Cloudy Weather
Day 79°
Night 64°
0
Thu 9/18
Cloudy Weather
Day 79°
Night 64°
0
Fri 9/19
Sunny Weather
Day 73°
Night 64°
20
Sat 9/20
Sunny Weather
Day 75°
Night 68°
5
Sun 9/21
Sunny Weather
Day 79°
Night 66°
5
Mon 9/22
Sunny Weather
Day 79°
Night 68°
20
Tue 9/23
Cloudy Weather
Day 77°
Night 68°
25
Wed 9/24
Cloudy Weather
Day 75°
Night 66°
10
Thu 9/25
Sunny Weather
Day 77°
Night 68°
20
Fri 9/26
Sunny Weather
Day 79°
Night 68°
20
Sat 9/27
Sunny Weather
Day 77°
Night 66°
20
Sun 9/28
Cloudy Weather
Day 73°
Night 63°
25
Mon 9/29
Cloudy Weather
Day 70°
Night 59°
25
Tue 9/30
Sunny Weather
Day 68°
Night 61°
5