8.4 (Very High)
Last Updated 22 minutes ago
The hourly Portola Valley, CA UV Index forecast for Tuesday, July 15th, 2025.
Last Updated 3 hours ago
The UV index forecast for the next five days in Portola Valley, CA has no days reaching the extreme level and 4 days reaching the high or very high levels. The peak UV intensity in Portola Valley over the next five days will be 10.8 on Thursday, July 17th at 1:00 pm.
The UV index forecast for Tuesday, July 15th in Portola Valley, CA is below.
| Time | UV Index | Risk |
|---|---|---|
| 3pm | 7.2 |
High |
| 4pm | 5.2 |
Moderate |
| 5pm | 3 |
Moderate |
| 6pm | 1.1 |
Low |
| 7pm | 0.3 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Wednesday, July 16th in Portola Valley, 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 | 0.2 |
Low |
| 8am | 0.6 |
Low |
| 9am | 1.5 |
Low |
| 10am | 3.2 |
Moderate |
| 11am | 5.5 |
Moderate |
| 12pm | 7.7 |
High |
| 1pm | 9.2 |
Very High |
| 2pm | 9.6 |
Very High |
| 3pm | 8.6 |
Very High |
| 4pm | 6.2 |
High |
| 5pm | 3.6 |
Moderate |
| 6pm | 1.6 |
Low |
| 7pm | 0.5 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Thursday, July 17th in Portola Valley, 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 | 0.2 |
Low |
| 8am | 0.7 |
Low |
| 9am | 1.6 |
Low |
| 10am | 3.2 |
Moderate |
| 11am | 6 |
High |
| 12pm | 9.8 |
Very High |
| 1pm | 10.8 |
Very High |
| 2pm | 10.3 |
Very High |
| 3pm | 8.5 |
Very High |
| 4pm | 6.1 |
High |
| 5pm | 3.5 |
Moderate |
| 6pm | 1.6 |
Low |
| 7pm | 0.5 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Friday, July 18th in Portola Valley, 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 | 0.2 |
Low |
| 8am | 0.8 |
Low |
| 9am | 1.9 |
Low |
| 10am | 3.6 |
Moderate |
| 11am | 6.2 |
High |
| 12pm | 9.2 |
Very High |
| 1pm | 10.5 |
Very High |
| 2pm | 10 |
Very High |
| 3pm | 8.3 |
Very High |
| 4pm | 5.9 |
Moderate |
| 5pm | 3.4 |
Moderate |
| 6pm | 1.5 |
Low |
| 7pm | 0.4 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Saturday, July 19th in Portola Valley, 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 |