Sonoma
California, USA
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Sonoma, CA

Neat rows of vines in a vineyard farm in Sonoma, California, the sun rays beaming through the cloudy sunset sky, and distant hilly silhouettes
Neat rows of vines in a vineyard farm in Sonoma, California, the sun rays beaming through the cloudy sunset sky, and distant hilly silhouettes
The last month of the spring, May, is a pleasant month in Sonoma, California, with average temperature fluctuating between 48.4°F (9.1°C) and 71.2°F (21.8°C).

Temperature

In May, the average high-temperature is essentially the same as in April - an agreeable 71.2°F (21.8°C). In Sonoma, the average low-temperature is 48.4°F (9.1°C).

Humidity

The average relative humidity in Sonoma, California, is 67%.

Rainfall

In Sonoma, during May, the rain falls for 5.1 days and regularly aggregates up to 0.75" (19mm) of precipitation. In Sonoma, California, during the entire year, the rain falls for 73.3 days and collects up to 15.47" (393mm) of precipitation.

Daylight

In Sonoma, the average length of the day is 14.3h.

Sunshine

The average sunshine in May is 10.6h.

UV index

In Sonoma, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV rays for the ordinary person.
Note: In May, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in May in Sonoma?

In May, in Sonoma, California, the average high-temperature is 71.2°F (21.8°C), and the average low-temperature is 48.4°F (9.1°C).

What is the average humidity in May in Sonoma?

In Sonoma, the average relative humidity in May is 67%.

How many days does it rain in May in Sonoma?

In May, the rain falls for 5.1 days. Throughout May, 0.75" (19mm) of precipitation is accumulated.

How many hours of daylight does Sonoma have in May?

In May, the average length of the day in Sonoma, California, is 14.3h.

How long on average sun shines in May in Sonoma?

In May, the average sunshine is 10.6h.

What is the UV index reading in May in Sonoma?

In Sonoma, the average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from unprotected exposure to the UV radiation.
Average temperature in May - Sonoma, CA
  • Average high temperature in May: 71.2°F

The warmest month (with the highest average high temperature) is August (82.9°F).
The month with the lowest average high temperature is December (55°F).

  • Average low temperature in May: 48.4°F

The month with the highest average low temperature is August (54.9°F).
The coldest month (with the lowest average low temperature) is December (41.4°F).

Average humidity in May - Sonoma, CA
  • Average humidity in May: 67%

The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is September (59%).

Average rainfall in May - Sonoma, CA
  • Average rainfall in May: 0.75"

The wettest month (with the highest rainfall) is February (3.43").
Driest months (with the lowest rainfall) are July and August (0.04").

Average rainfall days in May - Sonoma, CA
  • Average rainfall days in May: 5.1 days

The month with the highest number of rainy days is March (13.4 days).
The month with the lowest number of rainy days is August (0.8 days).

Average daylight in May / Average sunshine in May - Sonoma, CA
  • Average daylight in May: 14.3h

The month with the longest days is June (Average daylight: 14.8h).
The month with shortest days is December (Average daylight: 9.5h).

  • Average sunshine in May: 10.6h

The month with most sunshine is July (Average sunshine: 12h).
The month with least sunshine is December (Average sunshine: 5.6h).

Average UV index in May - Sonoma, CA
  • Average UV index in May: 5

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 3).