Monthly 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 January

January, the same as December, in Vallejo, California, is another mild winter month, with average temperature varying between 43°F (6.1°C) and 56.5°F (13.6°C). In Vallejo, the average high-temperature is relatively the same as in December - a still moderate 56.5°F (13.6°C). Weather in January »

Weather in February

The last month of the winter, February, is another mild month in Vallejo, California, with average temperature ranging between min 44.1°F (6.7°C) and max 59.2°F (15.1°C). In February, the average high-temperature is practically the same as in January - a still moderate 59.2°F (15.1°C). Weather in February »

Weather in March

March, the first month of the spring, in Vallejo, is a comfortable month, with average temperature fluctuating between 61.5°F (16.4°C) and 45°F (7.2°C). In March, the average high-temperature is practically the same as in February - a comfortable 61.5°F (16.4°C). Weather in March »

Weather in April

April, like March, in Vallejo, California, is another enjoyable spring month, with average temperature varying between 46.8°F (8.2°C) and 66.7°F (19.3°C). In Vallejo, the average high-temperature is practically the same as in March - a still comfortable 66.7°F (19.3°C). Weather in April »

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

Weather in June

The first month of the summer, June, is a warm month in Vallejo, California, with average temperature ranging between max 77.7°F (25.4°C) and min 54.1°F (12.3°C). In Vallejo, the average high-temperature marginally rises, from a pleasant 71.1°F (21.7°C) in May, to a moderately hot 77.7°F (25.4°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Vallejo, California, with average temperature ranging between max 80.1°F (26.7°C) and min 55.4°F (13°C). The warmest months are July and September, with an average high-temperature of 80.1°F (26.7°C). Weather in July »

Weather in August

August, the last month of the summer, in Vallejo, is also a moderately hot month, with average temperature ranging between max 79.7°F (26.5°C) and min 56.5°F (13.6°C). In August, the average high-temperature is almost the same as in July - a still moderately hot 79.7°F (26.5°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Vallejo, California, with temperature in the range of an average low of 56.3°F (13.5°C) and an average high of 80.1°F (26.7°C). The warmest months are July and September, with an average high-temperature of 80.1°F (26.7°C). Weather in September »

Weather in October

October, like September, is an agreeable autumn month in Vallejo, California, with average temperature fluctuating between 54°F (12.2°C) and 72.9°F (22.7°C). In Vallejo, the average high-temperature slightly decreases, from a moderately hot 80.1°F (26.7°C) in September, to an agreeable 72.9°F (22.7°C). Weather in October »

Weather in November

November, the last month of the autumn, in Vallejo, is another comfortable month, with average temperature fluctuating between 63°F (17.2°C) and 47.7°F (8.7°C). In Vallejo, the average high-temperature in November drops, from an agreeable 72.9°F (22.7°C) in October, to a comfortable 63°F (17.2°C). Weather in November »

Weather in December

December, the first month of the winter, in Vallejo, is also a moderate month, with average temperature ranging between max 55.4°F (13°C) and min 43.2°F (6.2°C). December is the coldest month, with an average high-temperature of 55.4°F (13°C) and an average low-temperature of 43.2°F (6.2°C). Weather in December »
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FAQ

How many days does it rain in Vallejo?

Throughout the year, there are 56.9 rainfall days, and 4.88" (124mm) of precipitation is accumulated.

What is the month with the lowest UV index in Vallejo?

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3.

What is the wettest month in Vallejo?

The month with the most rainfall in Vallejo, California, is February when the rain falls for 6.8 days and typically aggregates up to 1.14" (29mm) of precipitation.

What is the most humid month in Vallejo?

With an average relative humidity of 75%, March is the most humid month.

When are the longest days in Vallejo?

June has the longest days of the year, with an average of 14.8h of daylight.

When is the highest UV index in Vallejo?

With an average maximum UV index of 6, June is the month with the highest UV index.

What are the warmest months in Vallejo?

July and September, with an average high-temperature of 80.1°F (26.7°C), are warmest months in Vallejo.

What is the driest month in Vallejo?

Months with the least rainfall in Vallejo are July and August Rain falls for 1.5 days and accumulates 0.04" (1mm) of rain.

What month has the most sunshine in Vallejo?

July has the most sunshine of the year in Vallejo, California, with an average of 12h of sunshine.

What are the least humid months in Vallejo?

Months with the lowest humidity in Vallejo are September and October, with an average relative humidity of 60%.

What is the coldest month in Vallejo?

With an average high-temperature of 55.4°F (13°C) and an average low-temperature of 43.2°F (6.2°C), December is the coldest month in Vallejo.

What is the month with the shortest days in Vallejo?

With an average of 9.6h of daylight, December has the shortest days of the year.

What is the month with the least sunshine in Vallejo?

December has the least sunshine of the year, with an average of 5.7h of sunshine.

Average temperature
Vallejo, CA

Average temperature - Vallejo, CA

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).

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
Vallejo, CA

Average pressure - Vallejo, CA

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
Vallejo, CA

Average wind speed - Vallejo, CA

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
Vallejo, CA

Average humidity - Vallejo, CA

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
Vallejo, CA

Average rainfall - Vallejo, CA

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
Vallejo, CA

Average rainfall days - Vallejo, CA

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 / Average sunshine
Vallejo, CA

Average daylight / Average sunshine - Vallejo, CA

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.6h).

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
Vallejo, CA

Average sunshine days - Vallejo, CA

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 visibility
Vallejo, CA

Average visibility - Vallejo, CA

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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