May weather forecast and climate
Vallejo, CA

A colorful orange sunset skyline seen over the Napa River and Bridge in Vallejo, California
A colorful orange sunset skyline seen over the Napa River and Bridge in Vallejo, California

Weather in May

The last month of the spring, May, is an agreeable month in Vallejo, California, with temperature in the range of an average low of 49.8°F (9.9°C) and an average high of 71.1°F (21.7°C).

Temperature

In May, the average high-temperature is relatively the same as in April - an agreeable 71.1°F (21.7°C). In May, the average low-temperature is 49.8°F (9.9°C).

Humidity

The average relative humidity in Vallejo is 66%.

Rainfall

In Vallejo, California, during May, the rain falls for 3.6 days and regularly aggregates up to 0.28" (7mm) of precipitation. Throughout the year, in Vallejo, there are 56.9 rainfall days, and 4.88" (124mm) of precipitation is accumulated.

Daylight

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

Sunshine

In May, the average sunshine in Vallejo is 10.8h.

UV index

In Vallejo, California, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV rays for average individuals.
Note: In May, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 temperature in May in Vallejo?

The average high-temperature, in May, in Vallejo, California, is 71.1°F (21.7°C), while the average low-temperature is 49.8°F (9.9°C).

What is the average humidity in May in Vallejo?

In May, the average relative humidity in Vallejo is 66%.

How many days does it rain in May in Vallejo?

In Vallejo, California, in May, during 3.6 rainfall days, 0.28" (7mm) of precipitation is typically accumulated.

How many hours of daylight does Vallejo have in May?

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

How many hours of sunshine does Vallejo have in May?

In Vallejo, California, the average sunshine in May is 10.8h.

What is the UV index intensity in May in Vallejo?

In May, the average daily maximum UV index in Vallejo, California, is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in May
Vallejo, CA

Average temperature in May - Vallejo, CA
  • Average high temperature in May: 71.1°F

The warmest months (with the highest average high temperature) are July and September (80.1°F).
The month with the lowest average high temperature is December (55.4°F).

  • Average low temperature in May: 49.8°F

The month with the highest average low temperature is August (56.5°F).
The coldest month (with the lowest average low temperature) is January (43°F).

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Average pressure in May
Vallejo, CA

Average pressure in May - Vallejo, CA
  • Average pressure in May: 29.97"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in May
Vallejo, CA

Average wind speed in May - Vallejo, CA
  • Average wind speed in May: 7.1mph

The windiest month (with the highest average wind speed) is May (7.1mph).
The calmest month (with the lowest average wind speed) is November (4.6mph).

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Average humidity in May
Vallejo, CA

Average humidity in May - Vallejo, CA
  • Average humidity in May: 66%

The month with the highest relative humidity is March (75%).
Months with the lowest relative humidity are September and October (60%).

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Average rainfall in May
Vallejo, CA

Average rainfall in May - Vallejo, CA
  • Average rainfall in May: 0.28"

The wettest month (with the highest rainfall) is February (1.14").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in May
Vallejo, CA

Average rainfall days in May - Vallejo, CA
  • Average rainfall days in May: 3.6 days

The month with the highest number of rainy days is March (10.2 days).
The month with the least rainy days is August (0.9 days).

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

Average daylight in May / Average sunshine in May - Vallejo, 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: 9.6h).

  • Average sunshine in May: 10.8h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 5.7h).

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Average sunshine days in May
Vallejo, CA

Average sunshine days in May - Vallejo, CA
  • Average sunshine days in May: 24.3 days

The month with the most sunshine days is July (27.2 days).
The month with the least sunshine days is March (18.8 days).

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Average UV index in May
Vallejo, CA

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

The month with the highest UV index is June (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
Vallejo, CA

Average cloud cover in May - Vallejo, CA
  • Average cloud cover in May: 24

The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 9).

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Average visibility in May
Vallejo, CA

Average visibility in May - Vallejo, CA
  • Average visibility in May: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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