May Weather in San Francisco, Philippines

Last updated: August 27, 2025

In May, the average temperature in San Francisco, Philippines is a delightful 27°C (82°F), with a minimum of 25°C (77°F) and a maximum reaching up to 30°C (86°F). However, be prepared for some rain—132 mm (5.2 in) of precipitation typically falls over 24 days of the month. The average humidity sits at a muggy 83%, making it essential to stay hydrated and cool!

May Temperature in San Francisco

In May in San Francisco, the average temperature is 27°C (82°F). Maximums can reach 30°C (86°F), while minimums can drop to as low as 25°C (77°F). Overall, it's a warm and pleasant destination for travel, perfect for enjoying outdoor activities.

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

The chart illustrates May 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, May typically has an average temperature of 27°C (82°F), with highs reaching up to 30°C (86°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.

May Precipitation in San Francisco

In San Francisco in May, the precipitation amount is 132 mm (5.2 in) over a period of 24 days.

May Precipitation Trends in San Francisco

The chart displays monthly precipitation patterns in San Francisco, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In San Francisco, May typically receives around 132 mm (5.2 inches) of precipitation spread over approximately 24 days.

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

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Millimeters (mm) Inches (in)

May Humidity in San Francisco

In San Francisco in May humidity is 83%. With an average temperature of 27°C (82°F), this humidity feels like a thick, warm blanket enveloping you, making outdoor activities exhausting and encouraging visitors to seek the comfort of shade or air conditioning while exploring the area.

May Average Humidity in San Francisco

This chart illustrates the average monthly humidity levels in San Francisco, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in San Francisco is approximately 83%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in San Francisco

In San Francisco in May, 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 May

The chart shows the monthly maximum UV Index (UVI) for San Francisco in May, 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 May, the maximum UV index in San Francisco typically reaches 14, which falls under the extreme exposure category.

Data source: San Francisco May 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 May 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 May’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 May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	26°C (79°F)	297 mm (11.7 inches)	90%	extreme
February Weather	26°C (79°F)	224 mm (8.8 inches)	90%	extreme
March Weather	26°C (80°F)	162 mm (6.4 inches)	90%	extreme
April Weather	27°C (81°F)	90 mm (3.6 inches)	88%	extreme
May Weather	27°C (82°F)	132 mm (5.2 inches)	83%	extreme
June Weather	28°C (82°F)	186 mm (7.3 inches)	81%	extreme
July Weather	28°C (82°F)	238 mm (9.4 inches)	80%	extreme
August Weather	28°C (82°F)	189 mm (7.4 inches)	81%	extreme
September Weather	28°C (82°F)	215 mm (8.5 inches)	84%	extreme
October Weather	27°C (81°F)	263 mm (10.4 inches)	81%	extreme
November Weather	27°C (81°F)	241 mm (9.5 inches)	84%	extreme
December Weather	27°C (80°F)	391 mm (15.4 inches)	88%	extreme