UV Index for Costa Mesa, CA

Current Costa Mesa UV Index

1.1 (Low)

Last Updated 36 minutes ago

Hourly Costa Mesa UV Index

The hourly Costa Mesa, CA UV Index forecast for Sunday, December 21st, 2025.

5 Day Hourly Costa Mesa UV Index Forecast

Last Updated 23 hours ago

The UV index forecast for the next five days in Costa Mesa, CA has no days reaching the extreme level and no days reaching the high or very high levels. The peak UV intensity in Costa Mesa over the next five days will be 3.2 on Sunday, December 21st at 12:00 pm.

The UV index forecast for Sunday, December 21st in Costa Mesa, CA is below.

Time UV Index Risk
10am 2.2
Low
11am 3
Moderate
12pm 3.2
Moderate
1pm 2.6
Low
2pm 1.7
Low
3pm 0.8
Low
4pm 0.2
Low
5pm 0
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Monday, December 22nd in Costa Mesa, CA is below.

Time UV Index Risk
12am 0
Low
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low
5am 0
Low
6am 0
Low
7am 0
Low
8am 0.3
Low
9am 1
Low
10am 1.9
Low
11am 2.8
Low
12pm 3.1
Moderate
1pm 2.6
Low
2pm 1.7
Low
3pm 0.8
Low
4pm 0.2
Low
5pm 0
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Tuesday, December 23rd in Costa Mesa, CA is below.

Time UV Index Risk
12am 0
Low
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low
5am 0
Low
6am 0
Low
7am 0
Low
8am 0.2
Low
9am 0.7
Low
10am 1.2
Low
11am 2.4
Low
12pm 3
Moderate
1pm 2.7
Low
2pm 1.8
Low
3pm 0.8
Low
4pm 0.2
Low
5pm 0
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Wednesday, December 24th in Costa Mesa, CA is below.

Time UV Index Risk
12am 0
Low
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low