8.7 (Very High)
Last Updated 29 minutes ago
The hourly Lake San Marcos, CA UV Index forecast for Thursday, September 4th, 2025.
Last Updated 1 hour ago
The UV index forecast for the next five days in Lake San Marcos, CA has no days reaching the extreme level and 4 days reaching the high or very high levels. The peak UV intensity in Lake San Marcos over the next five days will be 9.5 on Sunday, September 7th at 1:00 pm.
The UV index forecast for Thursday, September 4th in Lake San Marcos, CA is below.
| Time | UV Index | Risk |
|---|---|---|
| 1pm | 9.2 |
Very High |
| 2pm | 8.3 |
Very High |
| 3pm | 6.2 |
High |
| 4pm | 3.7 |
Moderate |
| 5pm | 1.6 |
Low |
| 6pm | 0.4 |
Low |
| 7pm | 0 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Friday, September 5th in Lake 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 | 0.1 |
Low |
| 8am | 0.8 |
Low |
| 9am | 2.2 |
Low |
| 10am | 4.5 |
Moderate |
| 11am | 6.9 |
High |
| 12pm | 8.7 |
Very High |
| 1pm | 9.2 |
Very High |
| 2pm | 8.2 |
Very High |
| 3pm | 6.2 |
High |
| 4pm | 3.7 |
Moderate |
| 5pm | 1.6 |
Low |
| 6pm | 0.4 |
Low |
| 7pm | 0 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Saturday, September 6th in Lake 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 | 0.1 |
Low |
| 8am | 0.7 |
Low |
| 9am | 2.2 |
Low |
| 10am | 4.4 |
Moderate |
| 11am | 6.8 |
High |
| 12pm | 8.6 |
Very High |
| 1pm | 9.2 |
Very High |
| 2pm | 8.2 |
Very High |
| 3pm | 6.2 |
High |
| 4pm | 3.8 |
Moderate |
| 5pm | 1.6 |
Low |
| 6pm | 0.4 |
Low |
| 7pm | 0 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Sunday, September 7th in Lake 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 | 0.8 |
Low |
| 9am | 2.3 |
Low |
| 10am | 4.6 |
Moderate |
| 11am | 7.2 |
High |
| 12pm | 9 |
Very High |
| 1pm | 9.5 |
Very High |
| 2pm | 8.5 |
Very High |
| 3pm | 6.4 |
High |
| 4pm | 3.8 |
Moderate |
| 5pm | 1.6 |
Low |
| 6pm | 0.4 |
Low |
| 7pm | 0 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Monday, September 8th in Lake 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 |