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September Weather in San Francisco, Philippines

Last updated: August 27, 2025

In September, the average temperature in San Francisco, Philippines hovers around 26°C (80°F), with a comfortable minimum of 22°C (72°F) and a warm maximum reaching 32°C (91°F). Expect considerable precipitation of 493 mm (19.4 in) over approximately 28 days, contributing to the region's high average humidity of 85%. Embrace the tropical climate and prepare for a lush experience!

September Temperature in San Francisco

In September in San Francisco, the average temperature is 26°C (80°F). Maximum temperatures can reach 32°C (91°F), while minimums can drop as low as 22°C (72°F). This makes it an ideal time for travelers seeking warm and pleasant weather.

September Weather in San Francisco: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in San Francisco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Francisco, September typically has an average temperature of 26°C (80°F), with highs reaching up to 32°C (91°F) and lows dropping to around 22°C (72°F).
JanFebMarAprMayJunJulAugSepOctNovDec787981828280798079808079
Data source: Temperature data for San Francisco generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in San Francisco

In San Francisco in September, the precipitation amount is 493 mm (19.4 in) over a span of 28 days.

September Precipitation Trends in San Francisco

The chart displays monthly precipitation patterns in San Francisco, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In San Francisco, September typically receives around 493 mm (19.4 inches) of precipitation spread over approximately 28 days.
JanFebMarAprMayJunJulAugSepOctNovDec123768675234411490459493435176246
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Francisco

In San Francisco in September humidity is 85%. With an average temperature of 26°C (80°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities quite challenging and necessitating regular breaks to stay hydrated while sightseeing.

September Average Humidity in San Francisco

This chart illustrates the average monthly humidity levels in San Francisco, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in San Francisco is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%78%76%77%78%80%81%83%85%81%83%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Francisco

In San Francisco in September, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in San Francisco.

Maximum UV Index Levels in San Francisco for September

The chart shows the monthly maximum UV Index (UVI) for San Francisco in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in San Francisco typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec121416161414141515141211
Data source: San Francisco September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in San Francisco Compares to Other Months

Weather in San Francisco varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in San Francisco, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in San Francisco, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather26°C (79°F)123 mm (4.8 inches)81%extreme
February Weather26°C (79°F)76 mm (3.0 inches)78%extreme
March Weather27°C (81°F)86 mm (3.4 inches)76%extreme
April Weather28°C (83°F)75 mm (3.0 inches)77%extreme
May Weather28°C (83°F)234 mm (9.2 inches)78%extreme
June Weather27°C (81°F)411 mm (16.2 inches)80%extreme
July Weather26°C (80°F)490 mm (19.3 inches)81%extreme
August Weather26°C (80°F)458 mm (18.0 inches)83%extreme
September Weather26°C (80°F)493 mm (19.4 inches)85%extreme
October Weather26°C (80°F)435 mm (17.1 inches)80%extreme
November Weather27°C (80°F)176 mm (6.9 inches)83%extreme
December Weather26°C (80°F)245 mm (9.7 inches)86%extreme

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