At solar noon (12:54:31 PM) the sun reaches 41.7° above the horizon in San Francisco. Without clouds, that corresponds to a maximum UV index of about 4.2 (moderate). Clouds usually lower the real value; snow, sand, water and altitude can raise it.
UV index in San Francisco, next 14 days
| Date | Sun at noon | Clear-sky max | Forecast max |
|---|---|---|---|
| 41.7° | 4.2 Moderate | — | |
| 41.3° | 4.2 Moderate | — | |
| 41.0° | 4.1 Moderate | — | |
| 40.6° | 4.0 Moderate | — | |
| 40.3° | 4.0 Moderate | — | |
| 39.9° | 3.9 Moderate | — | |
| 39.6° | 3.8 Moderate | — | |
| 39.3° | 3.8 Moderate | — | |
| 38.9° | 3.7 Moderate | — | |
| 38.6° | 3.6 Moderate | — | |
| 38.3° | 3.6 Moderate | — | |
| 37.9° | 3.5 Moderate | — | |
| 37.6° | 3.4 Moderate | — | |
| 37.3° | 3.4 Moderate | — |
Clear-sky values are calculated from the sun's height at solar noon (cloud-free sky, average ozone). Forecast values from Open-Meteo include clouds and load in your browser.
High UV today? Sport sunscreen with SPF 100 stays on through sweat — essential for long outdoor activities.
View on Amazon →About San Francisco
San Francisco has existed as a municipality since 1776, serving as both a city and a county in California. The city encompasses an area of 600.6 square kilometres at an elevation of 30 metres, with a 2023 population of 808,988 residents. It is situated along the Pacific Ocean, the San Francisco Bay, and the Golden Gate. Notable features within the city include the Golden Gate Bridge, a suspension and road bridge, as well as the island of Alcatraz and the public University of California, San Francisco. It maintains international relationships with twin towns including Zurich, Abidjan, Burgas, Caracas, and Sydney.
AI-assisted description based on geographic data and editorial notes.