May Weather in Santa Rosa

Last updated: March 2, 2024

The weather in Santa Rosa, United States, during May is characterized by an average temperature of 20°C (68°F). Highs can soar to 34°C (93°F), while lows may dip to 4°C (40°F). Typically, the humidity level in Santa Rosa throughout May hovers around 69%.

4°C (40°F)

Minimum temperature

20°C (68°F)

Average temperature

34°C (93°F)

Maximum temperature

69%

Humidity

Precipitation and Sunshine hours

In May, Santa Rosa averages 30 mm (1.2 inches) of rainfall, typically over the course of 4 rainy days. The month enjoys an average of 14 hours 0 minutes of daylight, with the sun shining for approximately 11 hours 21 minutes each day. Additionally, there is a 56% probability of sunny days during this period.

30 mm (1.2 inches)

Precipitation

4 rainy days

Rainy days

11 hours 21 minutes

Sunshine hours

56%

Chance of sun

UV Index

In May, the UV Index in Santa Rosa reaches a maximum of 12, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 10 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00
UVI 1 2 4 7 9 11 12 11 8 6 3 2 1
Exposure Low Moderate High VeryHigh Extreme VeryHigh High Moderate Low
Time to burn 45 min 30 min 25 min 15 min 10 min 15 min 25 min 30 min 45 min

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