4.2 (Moderate)
Last Updated 44 minutes ago
The hourly San Francisco, CA UV Index forecast for Monday, October 20th, 2025.
Last Updated 3 hours ago
The UV index forecast for the next five days in San Francisco, CA has no days reaching the extreme level and no days reaching the high or very high levels. The peak UV intensity in San Francisco over the next five days will be 4.5 on Thursday, October 23rd at 1:00 pm.
The UV index forecast for Monday, October 20th in San Francisco, CA is below.
| Time | UV Index | Risk |
|---|---|---|
| 3pm | 3.1 |
Moderate |
| 4pm | 1.8 |
Low |
| 5pm | 0.7 |
Low |
| 6pm | 0.2 |
Low |
| 7pm | 0 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Tuesday, October 21st in San Francisco, 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 |
Low |
| 9am | 0.4 |
Low |
| 10am | 1.3 |
Low |
| 11am | 2.6 |
Low |
| 12pm | 3.7 |
Moderate |
| 1pm | 4.2 |
Moderate |
| 2pm | 4 |
Moderate |
| 3pm | 3 |
Moderate |
| 4pm | 1.6 |
Low |
| 5pm | 0.6 |
Low |
| 6pm | 0.1 |
Low |
| 7pm | 0 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Wednesday, October 22nd in San Francisco, 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 |
Low |
| 9am | 0.4 |
Low |
| 10am | 1 |
Low |
| 11am | 1.9 |
Low |
| 12pm | 3.3 |
Moderate |
| 1pm | 4.3 |
Moderate |
| 2pm | 4 |
Moderate |
| 3pm | 2.9 |
Low |
| 4pm | 1.6 |
Low |
| 5pm | 0.6 |
Low |
| 6pm | 0.1 |
Low |
| 7pm | 0 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Thursday, October 23rd in San Francisco, 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 |
Low |
| 9am | 0.4 |
Low |
| 10am | 1.4 |
Low |
| 11am | 2.7 |
Low |
| 12pm | 3.9 |
Moderate |
| 1pm | 4.5 |
Moderate |
| 2pm | 4.2 |
Moderate |
| 3pm | 3.2 |
Moderate |
| 4pm | 1.8 |
Low |
| 5pm | 0.7 |
Low |
| 6pm | 0.1 |
Low |
| 7pm | 0 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Friday, October 24th in San Francisco, 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 |