August 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 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).

Temperature

In August, the average high-temperature is almost the same as in July - a still moderately hot 79.7°F (26.5°C). The average low-temperature, in Vallejo, California, is 56.5°F (13.6°C).

Humidity

In Vallejo, the average relative humidity is 65%.

Rainfall

Months with the least rainfall are July and August Rain falls for 0.9 days and accumulates 0.04" (1mm) of rain.

Daylight

In Vallejo, California, the average length of the day is 13.6h.

Sunshine

The average sunshine in Vallejo is 11.9h.

UV index

In August, the average daily maximum UV index in Vallejo, California, is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 5 interpret into the following advice:
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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in August in Vallejo?

The average high-temperature, in August, is 79.7°F (26.5°C), while the average low-temperature is 56.5°F (13.6°C).

What is the average humidity in August in Vallejo?

The average relative humidity in August is 65%.

How much does it rain in Vallejo in August?

In Vallejo, California, in August, during 0.9 rainfall days, 0.04" (1mm) of precipitation is typically accumulated.

What is the driest month in Vallejo?

Months with the least rainfall in Vallejo, California, are July and August Rain falls for 0.9 days and accumulates 0.04" (1mm) of rain.

How many hours of daylight does Vallejo have in August?

The average length of the day in August in Vallejo is 13.6h.

How long on average sun shines in August in Vallejo?

In Vallejo, the average sunshine in August is 11.9h.

How high is the UV index in August in Vallejo?

The average daily maximum UV index in August is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to the Sun's UV rays.

Average temperature in August
Vallejo, CA

Average temperature in August - Vallejo, CA
  • Average high temperature in August: 79.7°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 August: 56.5°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 August
Vallejo, CA

Average pressure in August - Vallejo, CA
  • Average pressure in August: 29.92"

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 August
Vallejo, CA

Average wind speed in August - Vallejo, CA
  • Average wind speed in August: 6.2mph

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 August
Vallejo, CA

Average humidity in August - Vallejo, CA
  • Average humidity in August: 65%

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 August
Vallejo, CA

Average rainfall in August - Vallejo, CA
  • Average rainfall in August: 0.04"

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 August
Vallejo, CA

Average rainfall days in August - Vallejo, CA
  • Average rainfall days in August: 0.9 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 August /
Average sunshine in August
Vallejo, CA

Average daylight in August / Average sunshine in August - Vallejo, CA
  • Average daylight in August: 13.6h

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 August: 11.9h

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 August
Vallejo, CA

Average sunshine days in August - Vallejo, CA
  • Average sunshine days in August: 25.8 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 August
Vallejo, CA

Average UV index in August - Vallejo, CA
  • Average UV index in August: 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 August
Vallejo, CA

Average cloud cover in August - Vallejo, CA
  • Average cloud cover in August: 11

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 August
Vallejo, CA

Average visibility in August - Vallejo, CA
  • Average visibility in August: 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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