September Weather in San Francisco, Philippines

Last updated: August 27, 2025

In September, the average temperature in San Francisco, Philippines hovers around 29°C (84°F), offering a warm tropical climate. Expect temperatures to range from a comfortable minimum of 25°C (77°F) to a lively maximum of 35°C (95°F). With an average precipitation amount of 134 mm (5.3 in) spread across 20 days, and humidity levels peaking at 84%, visitors should be prepared for a mix of sunny and rainy spells this season.

September Temperature in San Francisco

In September in San Francisco, the average temperature is 29°C (84°F), with maximums reaching 35°C (95°F) and minimums dropping to as low as 25°C (77°F). It's a great time to visit for those who enjoy warm weather and outdoor activities!

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 29°C (84°F), with highs reaching up to 35°C (95°F) and lows dropping to around 25°C (77°F).

Data source: Temperature data for San Francisco generated using information from the Copernicus Climate Change Service.

September Precipitation in San Francisco

In San Francisco, in September, the precipitation amount is 134 mm (5.3 in) distributed over 20 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 134 mm (5.3 inches) of precipitation spread over approximately 20 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in San Francisco

In San Francisco in September, humidity is 84%. With an average temperature of 29°C (84°F), this humidity feels like a warm blanket enveloping you, making travel sticky and somewhat stifling, yet invigorating, as every step is accompanied by a gentle, humid embrace.

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 84%, offering insight into how humid the weather typically is during this month.

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 is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in San Francisco, you can check here.

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 14, which falls under the extreme exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	27°C (81°F)	248 mm (9.8 inches)	90%	extreme
February Weather	27°C (81°F)	212 mm (8.3 inches)	90%	extreme
March Weather	28°C (82°F)	156 mm (6.1 inches)	90%	extreme
April Weather	28°C (83°F)	80 mm (3.2 inches)	88%	extreme
May Weather	29°C (85°F)	111 mm (4.4 inches)	83%	extreme
June Weather	29°C (85°F)	142 mm (5.6 inches)	81%	extreme
July Weather	29°C (84°F)	149 mm (5.9 inches)	80%	extreme
August Weather	29°C (85°F)	123 mm (4.9 inches)	81%	extreme
September Weather	29°C (84°F)	134 mm (5.3 inches)	84%	extreme
October Weather	28°C (84°F)	196 mm (7.7 inches)	81%	extreme
November Weather	28°C (83°F)	180 mm (7.1 inches)	84%	extreme
December Weather	27°C (82°F)	332 mm (13.1 inches)	88%	extreme