World Weather & Climate Information

Average weather September in San Francisco (California), United States of America

The average minimum temperature (usually the minimum temperature is noted during the night) in San Francisco in September is 13.0°C (55.4°F). September is a dry month with an average of 5mm (0.2in) rain. Be prepared September is also the hottest month. This month generally has very pleasant temperatures. The average maximum temperature lies around 21.0°C (69.8°F). With a water temperature of around 14.0°C (57.2°F), this is not the best month to swim. If you enjoy looking at a blue sky and like sunbathing than this month is a great period to visit San Francisco. It has 267 hours of sun.

So what to wear in September? For visitors traveling to San Francisco we recommend wearing layers. So maybe a skirt, t-shirt, shorts for during the day and jeans and a warm jacket for some days and evenings.

Do these climate conditions match with when you want to go to San Francisco? Find out where to stay here.

For other monthly weather averages and what to do in September look at the numbers below.

Monthly averages

°C
Min Temperature 13.0°C
Max Temperature 21.0°C
Water Temperature 14.0°C
Chance of Rain 6.7%
Precipitation 5mm
Rainy Days 2
Windspeed 18.0kmph
Humidity 73%
Sunshine Hours 267
Percentage Sunshine 73%

What to Do

We rated the following activities from 1 (least suitable) to 10 (best) to do in September.
Cycling
10/10
Walking
10/10
Barbeque
9/10
Camping
10/10
Outdoor sports
10/10

More climate information for San Francisco

Weather and Climate offers all the information you need to know about the climate in San Francisco.

We collected past weather data from many thousand weather stations around the world. So find on this website the historical weather averages in other cities in United States of America and climate and forecast data for all other countries in the world.

Cheapest month to fly to San Francisco

Where to stay in San Francisco

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