On this page, you can find the current UV Index and hourly 5 day UV Index forecast for South San Francisco, San Mateo County, California (CA). The Ultraviolet Index forecast, which measures the radiation from the sun that reaches the Earth's surface is updated daily.
(Updated 52 minutes ago.)
As of 1:52 PM PDT, the UV Index in South San Francisco, CA is 9.3 (Very High).
The UV Index is expected to rise
to 9.5 (still Very High) between 2:00 PM - 3:00 PM PDT today.
UV Index Data sourced from the NOAA.
As of 1:52 PM PDT today in South San Francisco, CA, the UV Index is currently at a very high level of 9.3. However, as the day progresses, the UV index is expected to rise.
The UV Index in South San Francisco will continue to rise, reaching a very high level of 9.5 between 2:00 PM - 3:00 PM. This will also be the peak UV Index level for the day.
For the protection of your health against UV exposure, we highly recommended wearing sunglasses, generously applying broad-spectrum SPF 15+ strength sunscreen on exposed skin, covering the body with sun-protective clothing and a wide-brim hat, and reducing the time spent outdoors in the sun during peak hours.
After reaching its peak for the day, the UV Index will gradually decline through the afternoon and evening. It will return to high levels at 4:00 PM and then drop to low levels again from 6:00 PM onwards. As the day transitions into the night, the UV Index will drop back down to 0 at 8:00 PM.
| Time Range | UV Index | Risk |
|---|---|---|
| 6:00 AM - 10:00 AM (PDT) | 0 - 2.3 | Low |
| 10:00 AM - 11:00 AM | 4.3 | Moderate |
| 11:00 AM - 12:00 PM | 6.3 | High |
| 12:00 PM - 4:00 PM | 8.1 - 9.5 | Very High |
| 4:00 PM - 5:00 PM | 5.8 | High |
| 5:00 PM - 6:00 PM | 3.4 | Moderate |
| 6:00 PM - 12:00 AM | 0 - 1.6 | Low |
| Time Range | UV Index | Risk |
|---|---|---|
| 12:00 AM - 9:00 AM (PDT) | 0 - 1.2 | Low |
| 9:00 AM - 11:00 AM | 2.8 - 4.9 | Moderate |
| 11:00 AM - 12:00 PM | 6.9 | High |
| 12:00 PM - 4:00 PM | 7.7 - 9.2 | Very High |
| 4:00 PM - 5:00 PM | 5.5 | High |
| 5:00 PM - 6:00 PM | 3.3 | Moderate |
| 6:00 PM - 12:00 AM | 0 - 1.5 | Low |
| Time | UV Index | Risk |
|---|---|---|
| 1:00 PM - 2:00 PM (Now, PDT) | 9.3 | Very High |
| 2:00 PM - 3:00 PM | 9.5 | Very High |
| 3:00 PM - 4:00 PM | 8.3 | Very High |
| 4:00 PM - 5:00 PM | 5.8 | High |
| 5:00 PM - 6:00 PM | 3.4 | Moderate |
| 6:00 PM - 7:00 PM | 1.6 | Low |
| 7:00 PM - 8:00 PM | 0.5 | Low |
| 8:00 PM - 9:00 PM | 0 | Low |
| 9:00 PM - 10:00 PM | 0 | Low |
| 10:00 PM - 11:00 PM | 0 | Low |
| 11:00 PM - 12:00 AM | 0 | Low |