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May Weather in Santa Rosa, United States

Last updated: June 24, 2025

In May, the average temperature in Santa Rosa, United States is a pleasant 20°C (68°F). While it can dip as low as 1°C (34°F), the weather can also climb to a sweltering 36°C (97°F). Expect about 30 mm (1.2 in) of precipitation over 4 days, with an average humidity of 69%. Perfect for planning your next adventure!

May Temperature in Santa Rosa

In May, in Santa Rosa, the average temperature is 20°C (68°F). The maximum can reach 36°C (97°F) and the minimum can be as low as 1°C (34°F). Be prepared for a wide range of temperatures, and pack accordingly for your travels!

May Weather in Santa Rosa: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Santa Rosa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santa Rosa, May typically has an average temperature of 20°C (68°F), with highs reaching up to 36°C (97°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec394251586877797772584941
Data source: Temperature data for Santa Rosa 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 Santa Rosa

In Santa Rosa in May, the precipitation amount is 30 mm (1.2 in) over the course of 4 days.

May Precipitation Trends in Santa Rosa

The chart displays monthly precipitation patterns in Santa Rosa, 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 Santa Rosa, May typically receives around 30 mm (1.2 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec151228273041315633481411
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Santa Rosa

In Santa Rosa in May, humidity is 69%. With an average temperature of 20°C (68°F), this humidity feels like walking through a warm, enveloping mist, making outdoor activities enjoyable yet a bit sticky, so it's best to stay hydrated and take breaks in the shade.

May Average Humidity in Santa Rosa

This chart illustrates the average monthly humidity levels in Santa Rosa, 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 Santa Rosa is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%75%61%62%69%74%75%78%76%76%80%77%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Santa Rosa

In Santa Rosa 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 Santa Rosa.

Maximum UV Index Levels in Santa Rosa for May

The chart shows the monthly maximum UV Index (UVI) for Santa Rosa 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 Santa Rosa typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479111213121211854
Data source: Santa Rosa 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 Santa Rosa Compares to Other Months

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

This table compares monthly weather conditions in Santa Rosa, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)15 mm (0.6 inches)74%moderate
February Weather6°C (43°F)12 mm (0.5 inches)75%high
March Weather11°C (51°F)28 mm (1.1 inches)61%very high
April Weather14°C (58°F)27 mm (1.1 inches)61%extreme
May Weather20°C (68°F)30 mm (1.2 inches)69%extreme
June Weather25°C (78°F)41 mm (1.6 inches)74%extreme
July Weather26°C (80°F)31 mm (1.2 inches)75%extreme
August Weather25°C (77°F)56 mm (2.2 inches)78%extreme
September Weather22°C (72°F)33 mm (1.3 inches)76%extreme
October Weather14°C (58°F)47 mm (1.9 inches)76%very high
November Weather9°C (49°F)14 mm (0.6 inches)80%moderate
December Weather5°C (42°F)11 mm (0.4 inches)77%moderate

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