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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 22°C (71°F). However, temperatures can fluctuate, with a minimum of 9°C (49°F) and soaring up to a maximum of 35°C (95°F). With an average humidity of 67%, expect a comfortable atmosphere. Don't forget your umbrella, as you may encounter precipitation of 43 mm (1.7 in) over approximately 6 days throughout the month!

May Temperature in San Francisco

In May in San Francisco, the average temperature is 22°C (71°F). Maximums can reach 35°C (95°F), while minimums can drop to as low as 9°C (49°F). This makes San Francisco an ideal destination for travelers looking to enjoy warm days and mild evenings.

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 22°C (71°F), with highs reaching up to 35°C (95°F) and lows dropping to around 9°C (49°F).
JanFebMarAprMayJunJulAugSepOctNovDec616367697170686868676461
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 43 mm (1.7 in) over a period of 6 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 43 mm (1.7 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec9147343207280313278139347
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 67%. With an average temperature of 22°C (71°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet slightly uncomfortable, as the air hangs thick, reminding travelers to stay hydrated and seek shade during the midday sun.

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 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec70%65%59%60%67%80%81%83%83%80%77%76%
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.
JanFebMarAprMayJunJulAugSepOctNovDec911141414141313141298
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 Weather16°C (62°F)9 mm (0.3 inches)70%very high
February Weather17°C (64°F)14 mm (0.6 inches)65%extreme
March Weather19°C (67°F)7 mm (0.3 inches)59%extreme
April Weather21°C (69°F)3 mm (0.1 inches)60%extreme
May Weather22°C (71°F)43 mm (1.7 inches)67%extreme
June Weather21°C (70°F)207 mm (8.1 inches)80%extreme
July Weather20°C (68°F)280 mm (11.0 inches)81%extreme
August Weather20°C (68°F)313 mm (12.3 inches)83%extreme
September Weather20°C (68°F)278 mm (10.9 inches)83%extreme
October Weather19°C (67°F)139 mm (5.5 inches)80%extreme
November Weather18°C (65°F)34 mm (1.3 inches)77%very high
December Weather16°C (62°F)7 mm (0.3 inches)76%very high

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