September Weather in San Francisco

Last updated: March 2, 2024

The weather in San Francisco, Peru, during September is characterized by an average temperature of 15°C (60°F). Highs can soar to 24°C (75°F), while lows may dip to 8°C (47°F). Typically, the humidity level in San Francisco throughout September hovers around 52%.

8°C (47°F)

Minimum temperature

15°C (60°F)

Average temperature

24°C (75°F)

Maximum temperature

52%

Humidity

Precipitation and Sunshine hours

In September, San Francisco averages 189 mm (7.5 inches) of rainfall, typically over the course of 18 rainy days. The month enjoys an average of 12 hours 1 minutes of daylight, with the sun shining for approximately 10 hours 29 minutes each day. Additionally, there is a 28% probability of sunny days during this period.

189 mm (7.5 inches)

Precipitation

18 rainy days

Rainy days

10 hours 29 minutes

Sunshine hours

28%

Chance of sun

UV Index

In September, the UV Index in San Francisco reaches a maximum of 15, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 10 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00
UVI 2 4 8 12 14 15 13 10 5 2 1 0 0
Exposure Low Moderate VeryHigh Extreme VeryHigh Moderate Low
Time to burn 45 min 30 min 15 min 10 min 15 min 30 min 45 min

Compare San Francisco's Climate with Cities Worldwide