UV Index for San Marcos, CA

Current San Marcos UV Index

0 (Low)

Last Updated 31 minutes ago

Hourly San Marcos UV Index

The hourly San Marcos, CA UV Index forecast for Friday, October 17th, 2025.

5 Day Hourly San Marcos UV Index Forecast

Last Updated 19 hours ago

The UV index forecast for the next five days in San Marcos, CA has no days reaching the extreme level and no days reaching the high or very high levels. The peak UV intensity in San Marcos over the next five days will be 5.7 on Saturday, October 18th at 1:00 pm.

The UV index forecast for Friday, October 17th in San Marcos, CA is below.

Time UV Index Risk
7am 0
Low
8am 0.2
Low
9am 0.9
Low
10am 2.2
Low
11am 3.8
Moderate
12pm 4.9
Moderate
1pm 5.2
Moderate
2pm 4.6
Moderate
3pm 3.3
Moderate
4pm 1.8
Low
5pm 0.6
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Saturday, October 18th in San Marcos, 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 1
Low
10am 2.4
Low
11am 4
Moderate
12pm 5.3
Moderate
1pm 5.7
Moderate
2pm 5
Moderate
3pm 3.5
Moderate
4pm 1.8
Low
5pm 0.6
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Sunday, October 19th in San Marcos, 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 0.9
Low
10am 2.3
Low
11am 3.9
Moderate
12pm 5.2
Moderate
1pm 5.6
Moderate
2pm 4.8
Moderate
3pm 3.4
Moderate
4pm 1.8
Low
5pm 0.6
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, October 20th in San Marcos, 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