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May Weather in San Rafael, United States

Last updated: June 24, 2025

In San Rafael, United States, the average temperature for May hovers around 15°C (60°F), with lows of -1°C (30°F) and highs reaching up to 29°C (85°F). During this month, expect 16 mm (0.6 in) of precipitation over approximately 3 days, resulting in an average humidity of 48%.

May Temperature in San Rafael

In May in San Rafael, the average temperature is 15°C (60°F). Maximums can reach 29°C (85°F), while minimums can dip as low as -1°C (30°F). This diverse weather makes San Rafael an interesting destination for travelers seeking a mix of warm and cool experiences.

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

The chart illustrates May temperature patterns in San Rafael, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Rafael, May typically has an average temperature of 15°C (60°F), with highs reaching up to 29°C (85°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec293342516071727064524232
Data source: Temperature data for San Rafael 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 Rafael

In San Rafael in May, the precipitation amount is 16 mm (0.6 in), spread over a duration of 3 days.

May Precipitation Trends in San Rafael

The chart displays monthly precipitation patterns in San Rafael, 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 Rafael, May typically receives around 16 mm (0.6 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec242332201612583632241421
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in San Rafael

In San Rafael in May humidity is 48%. With an average temperature of 15°C (60°F), this humidity feels like a mild, refreshing embrace, making it quite pleasant for traveling and exploring the sights without feeling too hot or sticky.

May Average Humidity in San Rafael

This chart illustrates the average monthly humidity levels in San Rafael, 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 Rafael is approximately 48%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%83%71%61%48%36%37%46%62%74%82%82%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in San Rafael

In San Rafael in May, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in San Rafael.

Maximum UV Index Levels in San Rafael for May

The chart shows the monthly maximum UV Index (UVI) for San Rafael 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 Rafael typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111213131211864
Data source: San Rafael 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 Rafael Compares to Other Months

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

This table compares monthly weather conditions in San Rafael, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)24 mm (1.0 inches)81%moderate
February Weather1°C (34°F)23 mm (0.9 inches)83%high
March Weather6°C (43°F)31 mm (1.2 inches)71%very high
April Weather10°C (51°F)20 mm (0.8 inches)61%extreme
May Weather15°C (60°F)16 mm (0.6 inches)48%extreme
June Weather22°C (71°F)12 mm (0.5 inches)36%extreme
July Weather22°C (72°F)58 mm (2.3 inches)37%extreme
August Weather21°C (70°F)36 mm (1.4 inches)46%extreme
September Weather18°C (65°F)32 mm (1.3 inches)62%extreme
October Weather11°C (53°F)23 mm (0.9 inches)74%very high
November Weather6°C (42°F)14 mm (0.6 inches)82%high
December Weather0°C (32°F)21 mm (0.8 inches)82%moderate

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