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

August weather forecast and climate
Sonoma, CA

Neat rows of vines in a vineyard farm in Sonoma, California, the sun rays beaming through the cloudy sunset sky, and distant hilly silhouettes
Neat rows of vines in a vineyard farm in Sonoma, California, the sun rays beaming through the cloudy sunset sky, and distant hilly silhouettes
The last month of the summer, August, is another warm month in Sonoma, California, with average temperature ranging between max 82.9°F (28.3°C) and min 54.9°F (12.7°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 evaluated at a hot 86.7°F (30.4°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the 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 a measure of how hot it feels when the actual air humidity is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (differences in body mass, height, and shape, metabolic differences, wind), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. 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

In Sonoma, the average relative humidity is 64%.

Rainfall

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

Daylight

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

Sunshine

In Sonoma, the average sunshine is 11.9h.

UV index

In Sonoma, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to the UV radiation for the ordinary person.
Note: In August, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the warmest month in Sonoma?

The warmest month in Sonoma, California, 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?

The average high-temperature, in August, in Sonoma, is 82.9°F (28.3°C), while the average low-temperature is 54.9°F (12.7°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), that combines air temperature and relative humidity, in August is appraised at 86.7°F (30.4°C).

What is the average humidity in August in Sonoma?

In Sonoma, California, the average relative humidity in August is 64%.

How many days does it rain in August in Sonoma?

In Sonoma, California, in August, it is raining for 0.8 days, with typically 0.04" (1mm) of accumulated precipitation.

What is the driest month in Sonoma?

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

How many hours of daylight does Sonoma have in August?

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

How many hours of sunshine does Sonoma have in August?

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

What is the UV index intensity in August in Sonoma?

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

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%).

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

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

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 lowest number of rainy days is August (0.8 days).

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 shortest days is December (Average daylight: 9.5h).

  • Average sunshine in August: 11.9h

The month with most sunshine is July (Average sunshine: 12h).
The month with least sunshine is December (Average sunshine: 5.6h).

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).