May weather forecast
Sonoma, CA

Neat rows of vines in a vineyard farm in Sonoma, California
Neat rows of vines in a vineyard farm in Sonoma, California

Weather in May

May, the last month of the spring, in Sonoma, is a pleasant month, with average temperature fluctuating between 71.2°F (21.8°C) and 48.4°F (9.1°C).

Temperature

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

Humidity

The average relative humidity in Sonoma is 67%.

Rainfall

In Sonoma, in May, it is raining for 5.1 days, with typically 0.75" (19mm) of accumulated precipitation. In Sonoma, 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 in May is 14.3h.

Sunshine

In May, the average sunshine is 10.6h.

UV index

In Sonoma, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to the UV radiation for the average person.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the average humidity in May in Sonoma?

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

How many days does it rain in May in Sonoma?

In Sonoma, in May, it is raining for 5.1 days, with typically 0.75" (19mm) of accumulated precipitation.

What is the average length of the day in May in Sonoma?

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

How many hours of sunshine does Sonoma have in May?

In May, the average sunshine in Sonoma is 10.6h.

What is the UV index intensity in May in Sonoma?

In Sonoma, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV radiation.

Average temperature in May
Sonoma, CA

Average temperature in May - Sonoma, CA
  • Average high temperature in May: 21.8°C

The warmest month (with the highest average high temperature) is August (28.3°C).
The month with the lowest average high temperature is December (12.8°C).

  • Average low temperature in May: 9.1°C

The month with the highest average low temperature is August (12.7°C).
The coldest month (with the lowest average low temperature) is December (5.2°C).

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Average pressure in May
Sonoma, CA

Average pressure in May - Sonoma, CA
  • Average pressure in May: 1015mbar

The month with the highest atmospheric pressure is January (1020.4mbar).
The month with the lowest atmospheric pressure is June (1013mbar).

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Average wind speed in May
Sonoma, CA

Average wind speed in May - Sonoma, CA
  • Average wind speed in May: 10km/h

The windiest month (with the highest average wind speed) is May (10km/h).
The calmest month (with the lowest average wind speed) is November (7.1km/h).

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Average humidity in May
Sonoma, CA

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%).

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Average rainfall in May
Sonoma, CA

Average rainfall in May - Sonoma, CA
  • Average rainfall in May: 19mm

The wettest month (with the highest rainfall) is February (87mm).
The driest months (with the least rainfall) are July and August (1mm).

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Average rainfall days in May
Sonoma, CA

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 least rainy days is August (0.8 days).

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Average daylight in May /
Average sunshine in May
Sonoma, CA

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 the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in May: 10.6h

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

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Average sunshine days in May
Sonoma, CA

Average sunshine days in May - Sonoma, CA
  • Average sunshine days in May: 24.1 days

The month with the most sunshine days is July (28.7 days).
The month with the least sunshine days is March (16.1 days).

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Average UV index in May
Sonoma, CA

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).

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Average cloud cover in May
Sonoma, CA

Average cloud cover in May - Sonoma, CA
  • Average cloud cover in May: 26

The month with the most cloud cover is March (Cloud cover 40).
The month with the least cloud cover is July (Cloud cover 8).

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Average visibility in May
Sonoma, CA

Average visibility in May - Sonoma, CA
  • Average visibility in May: 9km

Months with the highest visibility are June, July and September (10km).
Months with the lowest visibility are January, February, March, April, May, August, October, November and December (9km).

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