UV Index in San Francisco

Real-time UV forecast & tanning weather

Current Conditions

Loading live weather data...

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

Location & Climate

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.

Tanning Tips

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+ → Aggressive Tanning — What to Know → Safe Tanning Tips → Foods That Help You Tan → Best Time of Day to Tan →

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.

Get Personalized Tanning Sessions

Tan AI calculates your perfect tanning time based on real-time UV, your skin type, and goals.