August 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 August

August, the last month of the summer in Sonoma, is also a moderately hot month, with an average temperature ranging between min 54.9°F (12.7°C) and max 82.9°F (28.3°C).

Temperature

With an average high-temperature of 82.9°F (28.3°C) and an average low-temperature of 54.9°F (12.7°C), August is the warmest month.

Heat index

In August, the average heat index is estimated at a hot 86.7°F (30.4°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'real feel', or 'feels like', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like pregnancy, metabolic differences, clothing, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

The average relative humidity in August is 64%.

Rainfall

The months with the least rainfall are July and August Rain falls for 0.8 days and accumulates 0.04" (1mm) of rain.

Daylight

The average length of the day in August in Sonoma is 13h and 36min.
On the first day of the month, sunrise is at 6:12 am and sunset at 8:19 pm. On the last day of August, in Sonoma, California, sunrise is at 6:38 am and sunset at 7:41 pm PDT.

Sunshine

The average sunshine in August in Sonoma is 11.9h.

UV index

The average daily maximum UV index in August in Sonoma is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 5 in August interpret into the following advice:
Take precautions - Protection against skin and eye damage is obliged. 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 warmest month in Sonoma?

The warmest month is August, with an average high-temperature of 82.9°F (28.3°C) and an average low-temperature of 54.9°F (12.7°C).

What is the temperature in August in Sonoma?

In August, the average high-temperature is 82.9°F (28.3°C), and the average low-temperature is 54.9°F (12.7°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is estimated at 86.7°F (30.4°C).

What is the average humidity in August in Sonoma?

The average relative humidity in August in Sonoma is 64%.

What is the driest month in Sonoma?

July and August are months with the least rain when the rain falls for 0.8 days and typically aggregates up to 0.04" (1mm) of rain.

How much does it rain in Sonoma in August?

In August, in Sonoma, California, the rain falls for 0.8 days. Throughout August, 0.04" (1mm) of precipitation is accumulated.

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

In August, the average day length is 13h and 36min.

What time are sunrise and sunset in August in Sonoma?

In August, on the first day of the month, sunrise is at 6:12 am and sunset at 8:19 pm. On the last day of the month, in Sonoma, California, sunrise is at 6:38 am and sunset at 7:41 pm PDT.

How many hours of sunshine does Sonoma have in August?

In Sonoma, California, the average sunshine duration in August is 11.9h.

How high is the UV index in August in Sonoma?

The average daily maximum UV index in August in Sonoma is 5. A UV Index of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.

Average temperature in August
Sonoma, CA

Average temperature in August - Sonoma, CA
  • Average high temperature in August: 82.9°F

The warmest month (with the highest average high temperature) is August (82.9°F).
The month with the lowest average high temperature is December (55°F).

  • Average low temperature in August: 54.9°F

The month with the highest average low temperature is August (54.9°F).
The coldest month (with the lowest average low temperature) is December (41.4°F).

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Average pressure in August
Sonoma, CA

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

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in August
Sonoma, CA

Average wind speed in August - Sonoma, CA
  • Average wind speed in August: 5mph

The windiest month (with the highest average wind speed) is May (6.2mph).
The calmest month (with the lowest average wind speed) is November (4.4mph).

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Average humidity in August
Sonoma, CA

Average humidity in August - Sonoma, CA
  • Average humidity in August: 64%

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 August
Sonoma, CA

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

The wettest month (with the highest rainfall) is February (3.43").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in August
Sonoma, CA

Average rainfall days in August - Sonoma, CA
  • Average rainfall days in August: 0.8 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 August /
Average sunshine in August
Sonoma, CA

Average daylight in August / Average sunshine in August - Sonoma, CA
  • Average daylight in August: 13h and 36min

The month with the longest days is June (Average daylight: 14h and 47min).
The month with the shortest days is December (Average daylight: 9h and 33min).

  • 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: 5.6h).

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Average sunshine days in August
Sonoma, CA

Average sunshine days in August - Sonoma, CA
  • Average sunshine days in August: 28.3 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 August
Sonoma, CA

Average UV index in August - Sonoma, CA
  • Average UV index in August: 5

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

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Average cloud cover in August
Sonoma, CA

Average cloud cover in August - Sonoma, CA
  • Average cloud cover in August: 9

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 August
Sonoma, CA

Average visibility in August - Sonoma, CA
  • Average visibility in August: 6mi

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

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