Peak in September
Coolest in December
Heavy in December
Peak in dry season
Sea Temperature
Pacific Ocean
Annual Average
Consider a wetsuit for extended swimming
Based on average sea surface temperature
San Francisco coastline
San Francisco Monthly Weather Guide
Click any month to explore daily weather forecasts
January
February
March
April
May
June
July
August
September
October
November
December
Essential Travel Info for San Francisco
Currency
USD
$ United States dollar
Language
English
Driving
Right side
Connect
Thearea codesfor San Francisco are 415 a...
Safety
Moderate Safety
GPI: 2.44
Best Time to Visit San Francisco
Location, climate overview & historical trends
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📍 37.7749° N, 122.4194° W
Open in Google MapsSan Francisco is a prominent destination in United States.
Located at 37.77°N latitude,San Francisco experiences a temperate climate with four distinct seasons.
Based on 30 years of data, September is the warmest month (avg. 22°C), while December is the coolest. December sees the most rain (29% chance), making August the driest month.
Best Time to Visit
NASA POWER Data (1991-2021)March, April, May
Best months to visit
17°C
Avg High
Based on 30 years of NASA satellite data,San Francisco receives approximately 331mm of rainfall annually. These months offer optimal temperatures and minimal rain probability for your visit.
Climate Trends
EXCLUSIVE1995-2040 Temperature Trend
1995 Avg
18.1°
2024 Avg
16.8°
2040 Proj
17.1°
+-0.46°C
per decade (observed)
+0.21°C
per decade (CMIP6)
🌡️ San Francisco has warmed by +-1.3°C since 1995. By 2040, an additional +0.3°C is projected (based on CMIP6 rate of 0.212°C/decade), for a total of +-1.0°C from 1995 baseline.
NASA POWER (1995-2024) + CMIP6 (CMCC_CM2_VHR4, EC_Earth3P_HR, FGOALS_f3_H, HiRAM_SIT_HR, MRI_AGCM3_2_S, NICAM16_8S)
Travel Intelligence
Exclusive flight analytics & health data for San Francisco
Smart Flight Estimator
Airport-to-Airport Logistics
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Flight Connectivity Analysis
Airport traffic data & seasonal patterns
Extremely busy airport
0
slots per day
Peak
Jul
Low
Jun
Monthly Traffic Distribution
Key Connections
Health & Safety Advisory
CDC travel health recommendations
No Special Vaccinations Required
Standard travel precautions apply
Source: CDC Travelers' Health
View Complete Health GuideSan Francisco Climate Data by Month
Historical temperature and precipitation averages
| Month | Avg High (°C) | Rain Probability (%) | Status |
|---|---|---|---|
| January | 14°C | 26% | Neutral |
| February | 14°C | 26% | Neutral |
| March | 15°C | 25% | 😊 Pleasant |
| April | 16°C | 11% | 😊 Pleasant |
| May | 18°C | 5% | 😊 Pleasant |
| June | 20°C | 1% | ✨ Perfect |
| July | 20°C | 0% | ✨ Perfect |
| August | 21°C | 0% | ✨ Perfect |
| September | 22°C | 1% | ✨ Perfect |
| October | 20°C | 7% | ✨ Perfect |
| November | 16°C | 18% | 😊 Pleasant |
| December | 13°C | 29% | Neutral |
Weather in Cities Near San Francisco
Explore climate data for popular destinations within easy reach
Los Angeles
United States
Las Vegas
United States
San Diego
United States
Portland
United States
Compare weather conditions with nearby destinations for your trip planning
Compare San Francisco Weather vs Popular Destinations
Similar Climate Destinations
Discover destinations with weather similar to San Francisco
Aix-en-Provence
France
Almaty
Kazakhstan
Auckland
New Zealand
Barcelona
Spain
Beijing
China
Bishkek
Kyrgyzstan
These destinations share similar weather patterns with San Francisco. Perfect alternatives if you're looking for the same climate in a different location.
San Francisco Weather FAQ
When is the best time to visit San Francisco?
Honestly, look for months with mild temperatures (20°C-25°C) and low rain chance. Based on historical data, March, April, May are usually great choices.
When is the hottest month in San Francisco?
September is historically the hottest month in San Francisco with average highs of 22°C.
When does it rain the most in San Francisco?
December typically sees the highest probability of rain (29%).
Is San Francisco expensive?
Prices vary by season. The "Perfect" weather months usually coincide with peak tourist season and higher prices, while the rainy or cold months offer better deals.