nomadseason

May Weather in Santa Rosa, United States

Last updated: June 24, 2025

In May, the average temperature in Santa Rosa, United States hovers around 26°C (79°F). Expect a minimum of 10°C (49°F) and a maximum of 40°C (105°F), offering a broad range for weather enthusiasts. With only 1 mm (0.0 in) of precipitation over 0 days, you'll likely enjoy plenty of sunshine. The average humidity is a comfortable 40%, making it an ideal time to explore the outdoors!

May Temperature in Santa Rosa

In May in Santa Rosa, the average temperature is 26°C (79°F). The maximum can reach 40°C (105°F) and the minimum can be as low as 10°C (49°F). Be prepared for a wide range of temperatures when traveling to Santa Rosa during this time!

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 26°C (79°F), with highs reaching up to 40°C (105°F) and lows dropping to around 10°C (49°F).
JanFebMarAprMayJunJulAugSepOctNovDec555764737989919186756655
Data source: Temperature data for Santa Rosa generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
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 1 mm (0.0 in) during a span of 0 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 1 mm (0.0 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec1818132173424157818
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

May Humidity in Santa Rosa

In Santa Rosa in May, humidity is 40%. With an average temperature of 26°C (79°F), this humidity feels like a refreshing balance, making it pleasant for traveling as the warmth is complemented by a gentle breeze that keeps you comfortable while exploring the local sights.

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 40%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%79%67%55%40%33%34%48%64%67%77%82%
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.
JanFebMarAprMayJunJulAugSepOctNovDec579111212121110864
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 Weather13°C (55°F)18 mm (0.7 inches)76%moderate
February Weather14°C (58°F)18 mm (0.7 inches)79%high
March Weather18°C (64°F)13 mm (0.5 inches)67%very high
April Weather23°C (73°F)2 mm (0.1 inches)55%extreme
May Weather26°C (79°F)1 mm (0.0 inches)40%extreme
June Weather32°C (89°F)7 mm (0.3 inches)33%extreme
July Weather33°C (91°F)34 mm (1.3 inches)34%extreme
August Weather33°C (91°F)24 mm (0.9 inches)48%extreme
September Weather30°C (86°F)15 mm (0.6 inches)64%very high
October Weather24°C (76°F)7 mm (0.3 inches)67%very high
November Weather19°C (66°F)8 mm (0.3 inches)77%high
December Weather13°C (56°F)18 mm (0.7 inches)82%moderate

Compare Santa Rosa's Climate with Cities Worldwide