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May Weather in San Francisco, Mexico

Last updated: August 27, 2025

In May, the average temperature in San Francisco, Mexico is a warm 28°C (82°F). Expect it to range from a minimum of 16°C (60°F) to a maximum of 34°C (94°F). During this month, you can anticipate 89 mm (3.5 in) of precipitation spread over about 14 days, with an average humidity level around 68%. 🌦️

May Temperature in San Francisco

In May in San Francisco, the average temperature is 28°C (82°F). Maximums can reach 34°C (94°F) and minimums can be as low as 16°C (60°F). This makes it an ideal time for traveling, as you can enjoy warm days while still having cooler evenings to relax.

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 28°C (82°F), with highs reaching up to 34°C (94°F) and lows dropping to around 16°C (60°F).
JanFebMarAprMayJunJulAugSepOctNovDec737677808282828281807674
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 89 mm (3.5 in) over a span of 14 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 89 mm (3.5 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec3919153989164871101481746735
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 68%. With an average temperature of 28°C (82°F), this humidity feels like walking through a warm, sticky blanket, making outdoor activities feel more strenuous and requiring frequent breaks for hydration.

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 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%78%71%70%68%69%74%81%82%83%84%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec810121313131212121187
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 Weather23°C (73°F)38 mm (1.5 inches)81%very high
February Weather24°C (76°F)19 mm (0.8 inches)78%very high
March Weather25°C (77°F)15 mm (0.6 inches)71%extreme
April Weather27°C (81°F)38 mm (1.5 inches)70%extreme
May Weather28°C (82°F)89 mm (3.5 inches)68%extreme
June Weather28°C (82°F)164 mm (6.5 inches)69%extreme
July Weather28°C (83°F)87 mm (3.4 inches)74%extreme
August Weather28°C (83°F)110 mm (4.3 inches)81%extreme
September Weather27°C (82°F)148 mm (5.8 inches)82%extreme
October Weather26°C (80°F)174 mm (6.9 inches)83%extreme
November Weather24°C (76°F)67 mm (2.6 inches)84%very high
December Weather23°C (74°F)35 mm (1.4 inches)86%high

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