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May Weather in San Bruno, United States

Last updated: June 24, 2025

The average temperature in San Bruno, United States during May is a mild 14°C (57°F). Expect a minimum of 8°C (47°F) and a maximum of 24°C (75°F), making it a comfortable time to explore. Be prepared for 20 mm (0.8 in) of precipitation over 2 days, and enjoy the fresh air with an average humidity of 83%.

May Temperature in San Bruno

In May in San Bruno, the average temperature is 14°C (57°F). Maximums can reach 24°C (75°F) and minimums can be as low as 8°C (47°F). This pleasant temperature range makes it an ideal time for outdoor activities and exploring the local attractions.

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

The chart illustrates May temperature patterns in San Bruno, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Bruno, May typically has an average temperature of 14°C (57°F), with highs reaching up to 24°C (75°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec515253555659596162605552
Data source: Temperature data for San Bruno 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 Bruno

In San Bruno in May, the precipitation amount is 20 mm (0.8 in) over the course of 2 days.

May Precipitation Trends in San Bruno

The chart displays monthly precipitation patterns in San Bruno, 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 Bruno, May typically receives around 20 mm (0.8 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec1061097835203322305095
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in San Bruno

In San Bruno in May, humidity is 83%. With an average temperature of 14°C (57°F), this humidity feels like you're stepping into a warm, damp embrace that can make outdoor activities quite uncomfortable, often leaving you sweaty and exhausted if you're not prepared with plenty of water and breathable clothing.

May Average Humidity in San Bruno

This chart illustrates the average monthly humidity levels in San Bruno, 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 Bruno is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%82%82%79%83%84%87%87%86%80%79%79%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in San Bruno

In San Bruno in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in San Bruno.

Maximum UV Index Levels in San Bruno for May

The chart shows the monthly maximum UV Index (UVI) for San Bruno 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 Bruno typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589101111109743
Data source: San Bruno 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 Bruno Compares to Other Months

Weather in San Bruno varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in San Bruno, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in San Bruno, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (52°F)106 mm (4.2 inches)85%moderate
February Weather11°C (52°F)109 mm (4.3 inches)82%moderate
March Weather12°C (53°F)78 mm (3.1 inches)82%very high
April Weather13°C (55°F)35 mm (1.4 inches)79%very high
May Weather14°C (57°F)20 mm (0.8 inches)83%very high
June Weather15°C (60°F)3 mm (0.1 inches)84%extreme
July Weather15°C (60°F)3 mm (0.1 inches)87%extreme
August Weather16°C (61°F)2 mm (0.1 inches)87%very high
September Weather17°C (63°F)2 mm (0.1 inches)86%very high
October Weather16°C (60°F)30 mm (1.2 inches)80%high
November Weather13°C (56°F)50 mm (2.0 inches)79%moderate
December Weather11°C (52°F)95 mm (3.7 inches)79%moderate

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