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

Monthly weather forecast and climate
Vacaville, CA

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A beautiful blue water lagoon set in Vacaville, California, amid scenic greenery of trees and vast fields, hill ranges, and a walking path around the water
A beautiful blue water lagoon set in Vacaville, California, amid scenic greenery of trees and vast fields, hill ranges, and a walking path around the water

Weather in January

January in Vacaville, California, is a moderate winter month, with average temperature ranging between max 55.8°F (13.2°C) and min 41.4°F (5.2°C). In January, the average high-temperature is essentially the same as in December - a moderate 55.8°F (13.2°C). Weather in January »

Weather in February

The last month of the winter, February, is another mild month in Vacaville, California, with average temperature fluctuating between 59.5°F (15.3°C) and 41.9°F (5.5°C). In February, the average high-temperature is practically the same as in January - a still mild 59.5°F (15.3°C). Weather in February »

Weather in March

The first month of the spring, March, is an enjoyable month in Vacaville, California, with temperature in the range of an average high of 62.8°F (17.1°C) and an average low of 43.2°F (6.2°C). In Vacaville, California, the average high-temperature in March is relatively the same as in February - a comfortable 62.8°F (17.1°C). Weather in March »

Weather in April

April in Vacaville, California, is a pleasant spring month, with temperature in the range of an average high of 69.4°F (20.8°C) and an average low of 46.2°F (7.9°C). In Vacaville, California, the average high-temperature slightly increases, from an enjoyable 62.8°F (17.1°C) in March, to an agreeable 69.4°F (20.8°C). Weather in April »

Weather in May

May, the last month of the spring, in Vacaville, is a warm month, with average temperature varying between 76.5°F (24.7°C) and 50.4°F (10.2°C). In Vacaville, the average high-temperature slightly increases, from a pleasant 69.4°F (20.8°C) in April, to a warm 76.5°F (24.7°C). Weather in May »

Weather in June

June, the first month of the summer, in Vacaville, is a hot month, with average temperature fluctuating between 86°F (30°C) and 55.8°F (13.2°C). In June, the average high-temperature increases, from a moderately hot 76.5°F (24.7°C) in May, to a hot 86°F (30°C). Weather in June »

Weather in July

July, the same as June, in Vacaville, California, is a hot summer month, with average temperature ranging between max 91°F (32.8°C) and min 57.7°F (14.3°C). With an average high-temperature of 91°F (32.8°C) and an average low-temperature of 57.7°F (14.3°C), July is the warmest month. In July, the average heat index is appraised at a torrid 97.2°F (36.2°C). Weather in July »

Weather in August

August, the last month of the summer, in Vacaville, is another hot month, with average temperature fluctuating between 57.9°F (14.4°C) and 90.3°F (32.4°C). In August, the average high-temperature is practically the same as in July - a still tropical 90.3°F (32.4°C). Weather in August »

Weather in September

September, the first month of the autumn, in Vacaville, is still a hot month, with average temperature varying between 86.9°F (30.5°C) and 58.1°F (14.5°C). In September, the average high-temperature is practically the same as in August - a still tropical 86.9°F (30.5°C). Weather in September »

Weather in October

October, the same as September, is another warm autumn month in Vacaville, California, with average temperature ranging between min 54.1°F (12.3°C) and max 76.5°F (24.7°C). In October, the average high-temperature decreases, from a hot 86.9°F (30.5°C) in September, to a warm 76.5°F (24.7°C). Weather in October »

Weather in November

The last month of the autumn, November, is also an enjoyable month in Vacaville, California, with average temperature ranging between max 63.5°F (17.5°C) and min 46.6°F (8.1°C). In November, the average high-temperature decreases, from a moderately hot 76.5°F (24.7°C) in October, to an enjoyable 63.5°F (17.5°C). Weather in November »

Weather in December

The first month of the winter, December, is still a cool month in Vacaville, California, with temperature in the range of an average low of 41.4°F (5.2°C) and an average high of 54.7°F (12.6°C). December is the coldest month, with an average high-temperature of 54.7°F (12.6°C) and an average low-temperature of 41.4°F (5.2°C). Weather in December »

FAQ

How many days does it rain in Vacaville?

Throughout the year, there are 47.1 rainfall days, and 4.17" (106mm) of precipitation is accumulated.

When is the lowest UV index in Vacaville?

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

What is the wettest month in Vacaville?

February is the month with the most rainfall in Vacaville. Rain falls for 6 days and accumulates 0.87" (22mm) of precipitation.

What is the most humid month in Vacaville?

The most humid month in Vacaville, California, is March, with an average relative humidity of 75%.

When are the longest days in Vacaville?

With an average of 14.8h of daylight, June has the longest days of the year in Vacaville.

What is the month with the highest UV index in Vacaville?

Months with the highest UV index are June through August, with an average maximum UV index of 6.

What is the warmest month in Vacaville?

July is the warmest month in Vacaville, with an average high-temperature of 91°F (32.8°C) and an average low-temperature of 57.7°F (14.3°C).

What is the driest month in Vacaville?

Months with the least rainfall are July through September Rain falls for 1.1 days and accumulates 0.04" (1mm) of rain.

What month has the most sunshine in Vacaville?

July has the most sunshine of the year in Vacaville, with an average of 12.1h of sunshine.

What is the least humid month in Vacaville?

September is the least humid month in Vacaville, with an average relative humidity of 48%.

What is the coldest month in Vacaville?

December is the coldest month in Vacaville, with an average high-temperature of 54.7°F (12.6°C) and an average low-temperature of 41.4°F (5.2°C).

What is the month with the shortest days in Vacaville?

The month with the shortest days in Vacaville, California, is December, with an average of 9.5h of daylight.

What is the month with the least sunshine in Vacaville?

The month with the least sunshine in Vacaville, California, is December, with an average of 5.7h of sunshine.

Average temperature
Vacaville, CA

Average temperature - Vacaville, CA

The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is December (54.7°F).

The month with the highest average low temperature is September (58.1°F).
Coldest months (with the lowest average low temperature) are January and December (41.4°F).

Average humidity
Vacaville, CA

Average humidity - Vacaville, CA

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is September (48%).

Average rainfall
Vacaville, CA

Average rainfall - Vacaville, CA

The wettest month (with the highest rainfall) is February (0.87").
Driest months (with the lowest rainfall) are July, August and September (0.04").

Average rainfall days
Vacaville, CA

Average rainfall days - Vacaville, CA

The month with the highest number of rainy days is March (7.2 days).
The month with the lowest number of rainy days is August (1 days).

Average daylight / Average sunshine
Vacaville, CA

Average daylight / Average sunshine - Vacaville, CA

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

The month with most sunshine is July (Average sunshine: 12.1h).
The month with least sunshine is December (Average sunshine: 5.7h).

Average UV index
Vacaville, CA

Average UV index - Vacaville, CA

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