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 another warm month, with average temperature fluctuating between 82.9°F (28.3°C) and 54.9°F (12.7°C).

Temperature

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).

Heat index

In August, the average heat index is calculated to be a tropical 86.7°F (30.4°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. 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 'feels like', 'apparent temperature', 'felt air temperature', or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (metabolic differences, wind, pregnancy), and activity. 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 Sonoma, California, is 64%.

Rainfall

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

Daylight

In August, the average length of the day is 13.6h.

Sunshine

In August, the average sunshine is 11.9h.

UV index

In August, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to the UV radiation for ordinary individuals.
Note: The daily maximum UV index of 5 in August interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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?

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 in Sonoma, California.

What is the temperature in August in Sonoma?

In Sonoma, California, 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. 'felt air temperature', 'feels like'), which combines relative humidity and air temperature, in August is calculated to be 86.7°F (30.4°C).

What is the average humidity in August in Sonoma?

In Sonoma, the average relative humidity in August 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 many days does it rain in August in Sonoma?

In Sonoma, in August, during 0.8 rainfall days, 0.04" (1mm) of precipitation is typically accumulated.

How many hours of daylight does Sonoma have in August?

In Sonoma, the average length of the day in August is 13.6h.

How long on average sun shines in August in Sonoma?

The average sunshine in August is 11.9h.

How high is the UV index in August in Sonoma?

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

Average temperature in August
Sonoma, CA

Average temperature in August - Sonoma, CA
  • Average high temperature in August: 28.3°C

The warmest month (with the highest average high temperature) is August (28.3°C).
The month with the lowest average high temperature is December (12.8°C).

  • Average low temperature in August: 12.7°C

The month with the highest average low temperature is August (12.7°C).
The coldest month (with the lowest average low temperature) is December (5.2°C).

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Average pressure in August
Sonoma, CA

Average pressure in August - Sonoma, CA
  • Average pressure in August: 1013.1mbar

The month with the highest atmospheric pressure is January (1020.4mbar).
The month with the lowest atmospheric pressure is June (1013mbar).

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Average wind speed in August
Sonoma, CA

Average wind speed in August - Sonoma, CA
  • Average wind speed in August: 8.1km/h

The windiest month (with the highest average wind speed) is May (10km/h).
The calmest month (with the lowest average wind speed) is November (7.1km/h).

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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: 1mm

The wettest month (with the highest rainfall) is February (87mm).
The driest months (with the least rainfall) are July and August (1mm).

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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: 13.6h

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

  • 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

Months with the highest UV index are June and July (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
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: 9km

Months with the highest visibility are June, July and September (10km).
Months with the lowest visibility are January, February, March, April, May, August, October, November and December (9km).

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