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May Weather in San Francisco, Mexico

Last updated: August 26, 2025

In May, the average temperature in San Francisco, Mexico is a pleasant 25°C (78°F). Expect a minimum of 22°C (72°F) and a maximum of 28°C (82°F), providing a comfortable climate for outdoor activities. With only 3 mm (0.1 in) of precipitation over 0 days, you can enjoy mostly dry conditions. The average humidity sits at a moderate 69%, making it an ideal time to explore the beauty of your destination!

May Temperature in San Francisco

In May in San Francisco, the average temperature is 25°C (78°F), with maximums reaching 28°C (82°F) and minimums dropping as low as 22°C (72°F). This mild climate makes San Francisco an ideal destination for travelers seeking pleasant weather.

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 25°C (78°F), with highs reaching up to 28°C (82°F) and lows dropping to around 22°C (72°F).
JanFebMarAprMayJunJulAugSepOctNovDec747474757881848483838177
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.

May Precipitation in San Francisco

In San Francisco in May, the precipitation amount is 3 mm (0.1 in) during a total of 0 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 3 mm (0.1 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec2322003671302252661971915
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in San Francisco

In San Francisco in May humidity is 69%. With an average temperature of 25°C (78°F), this humidity feels like a warm and tropical embrace, making traveling a bit sticky but also invigorating as each breath carries a hint of the surrounding environment, perfect for those who enjoy a lively and immersive journey.

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 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec71%69%67%66%69%78%79%78%78%75%74%74%
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 reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in San Francisco.

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 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec810121313131213121197
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.
 TemperaturePrecipitationHumidityUV
January Weather24°C (75°F)23 mm (0.9 inches)71%very high
February Weather23°C (74°F)22 mm (0.9 inches)69%very high
March Weather23°C (74°F)0 mm (0.0 inches)67%extreme
April Weather24°C (76°F)0 mm (0.0 inches)66%extreme
May Weather25°C (78°F)3 mm (0.1 inches)69%extreme
June Weather27°C (81°F)67 mm (2.6 inches)78%extreme
July Weather29°C (84°F)130 mm (5.1 inches)79%extreme
August Weather29°C (84°F)225 mm (8.9 inches)78%extreme
September Weather28°C (83°F)266 mm (10.5 inches)78%extreme
October Weather28°C (83°F)197 mm (7.7 inches)75%extreme
November Weather27°C (81°F)19 mm (0.8 inches)74%very high
December Weather25°C (77°F)15 mm (0.6 inches)74%high

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