UV Index in San Francisco

Real-time UV forecast & tanning weather

Current Conditions

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Weather data by Open-Meteo (CC BY 4.0)

Monthly UV Index in San Francisco

Average daily maximum UV index by month

Jan
2
Low
Feb
4
Moderate
Mar
6
High
Apr
8
Very High
May
9
Very High
Jun
10
Very High
Jul
10
Very High
Aug
9
Very High
Sep
7
High
Oct
5
Moderate
Nov
3
Moderate
Dec
2
Low

Best Months to Tan in San Francisco

Based on average UV levels, the best months for tanning in San Francisco are:

April Great May Excellent June Excellent July Excellent August Excellent September Great

Rating based on average monthly UV index

Tanning Guide for San Francisco

San Francisco's coastal climate features moderate temperatures and high UV levels during the summer and fall, though morning fog is common and can reduce direct sun exposure. When the fog clears, head to Ocean Beach or Crissy Field for tanning, focusing on the sunnier afternoon hours after any marine layer has burned off.

San Francisco has a distinct tanning season from April to September. Winter UV is too low for effective tanning.

Related Guides

Tanning in UV 9-10 → Best Time of Day to Tan → Safe Tanning Tips →

Frequently Asked Questions

What is the UV index in San Francisco right now?
The current UV index in San Francisco is shown in the live weather section above. UV levels change throughout the day, typically peaking between 11 AM and 2 PM local time.
What is the best month to tan in San Francisco?
The best months for tanning in San Francisco are April, May, June, July, August, September, when average UV levels reach 7 or higher.
How long should I tan in San Francisco?
Tanning time depends on your skin type and the current UV index. For a moderate UV of 9, a person with Skin Type III (medium complexion) can safely tan for about 17 minutes per session. Use our Tanning Calculator for personalized recommendations.
Is it safe to tan in UV index 10?
UV index 10 is classified as Very High. Very High — avoid prolonged sun exposure. Short tanning sessions with SPF 50+ recommended.
When is the peak UV time in San Francisco?
UV levels in San Francisco typically peak between 11:00 AM and 2:00 PM local time. The exact peak depends on the season, cloud cover, and altitude.

UV Index in Nearby Cities

11
Miami
Peak UV
 11
Los Angeles
Peak UV
 11
San Diego
Peak UV
 12
Honolulu
Peak UV
 12
Phoenix
Peak UV
 12
Las Vegas
Peak UV

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