San Francisco Weather in September

September in San Francisco brings high temperatures, with highs of 26°C (79°F) and nights dropping to 19°C (66°F). With perfect weather conditions overall, it's a good time to visit.

Rainfall in San Francisco in September

Typically, you can expect about 4 days of rain this month, with 28 mm (1.1 in) on average. When rain does fall, showers tend to be light and brief. Most days will be dry.

Temperature in San Francisco in September

The perfect temperature in San Francisco in September makes it a solid month to visit, with 26°C (79°F) during the day and 19°C (66°F) at night. September is in the summer season. Overall, the month follows a fairly predictable daily temperature pattern. With overnight lows of 19°C (66°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in San Francisco in September

Enjoy a sunny month with about 255 hours of sunshine, the clear skies make San Francisco even more beautiful.

Wind Speed in San Francisco in September

September sees wind speeds averaging 2 m/s (4 knots). You'll typically experience pleasant light breezes that move leaves slightly and feel refreshing. As an average, expect variation from very calm days to periods with more apparent air movement.

Average water temperature in September

The water sits at 22°C (72°F), which is a nice temperature for swimming. Not too cold, not too warm — most visitors are happy to spend time in the water.

If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit San Francisco.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Spain, check out our San Francisco's climate page.

San Francisco Temperature in September

Min Temperature 19°C (66°F)  

Max Temperature 26°C (79°F)  

Water Temperature 22°C (72°F) *  

Chance of Rain 14%  

Precipitation 28 mm (1.1 in)  

Rainy days 4 days  

Humidity 65% *  

Windspeed 2 m/s (4 knots) *  

Sunshine 255 hours *  

Percentage Sunshine 70% *  

* Data from: Málaga, Spain (17 KM, 10 Miles).

What to Wear in San Francisco in September

Warm but pleasant conditions in San Francisco in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Light rain is possible, so consider bringing a small umbrella or rain jacket. The water temperature sits at about 22°C (72°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in San Francisco in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

10/10

Cycling

8/10

Walking

8/10

Barbeque

10/10

Camping

10/10

Outdoor sports

8/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Spain, check out our San Francisco's climate page.

More climate data for San Francisco

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full San Francisco climate overview or explore weather in Spain.