August weather forecast
Santa Rosa, CA

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Set in a scenic valley, the Camarillo region of Santa Rosa, California, has great modern homes and is neared by scenic rugged mountain layouts
Set in a scenic valley, the Camarillo region of Santa Rosa, California, has great modern homes and is neared by scenic rugged mountain layouts

Weather in August

As the final month of summer, August in Santa Rosa is marked by warm temperatures comparable to July. The almost negligible rainfall of 0.04" further emphasizes the arid conditions. Furthermore, the fewest cloudy days in the year are noticed during August, emphasizing clear skies and plenty of sunshine. A stable level of humidity and wind speed contributes to the overall steadiness of the weather. As daylight hours start gradually decreasing from August onwards, it hints at the slow but impending arrival of fall.

Temperature

The highest temperatures are recorded in August, with averages reaching a high of 79.7°F and a low of 54.7°F.

Humidity

In August, the average relative humidity is 67%.

Rainfall

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

Daylight

In August, the average length of the day in Santa Rosa is 13h and 37min.
On the first day of August, sunrise is at 6:13 am and sunset at 8:21 pm. On the last day of the month, sunrise is at 6:39 am and sunset at 7:42 pm PDT.

Sunshine

In August, the average sunshine in Santa Rosa is 11.8h.

UV index

In Santa Rosa, the average daily maximum UV index in August is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the average person.
Note: In August, the maximum UV index of 5 suggests these recommendations:
Take necessary precautions - Defending against sun damage is advocated. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
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FAQ

What month is the hottest in Santa Rosa?

Santa Rosa's temperature records reveal August as the warmest month, marked by average highs of 79.7°F and lows of 54.7°F.

What are the temperatures in Santa Rosa in August?

In August, the average high-temperature and low-temperature in Santa Rosa are 79.7°F and 54.7°F respectively.

What is the average humidity in August in Santa Rosa?

In August, the average relative humidity is 67%.

What is the driest month in Santa Rosa?

July and August are months with the least rain in Santa Rosa, California, when the rain falls for 0.8 days and typically aggregates up to 0.04" of rain.

How many days does it rain in August in Santa Rosa?

In Santa Rosa, California, in August, during 0.8 rainfall days, 0.04" of precipitation is typically accumulated.

How many hours of daylight does Santa Rosa have in August?

In Santa Rosa, the average day length in August is 13h and 37min.

What time are sunrise and sunset in August in Santa Rosa?

On the first day of August in Santa Rosa, sunrise is at 6:13 am and sunset at 8:21 pm. On the last day of the month, sunrise is at 6:39 am and sunset at 7:42 pm PDT.

How many hours of sunshine does Santa Rosa have in August?

In Santa Rosa, the average sunshine duration in August is 11.8h.

What is the UV index reading in August in Santa Rosa?

The average daily maximum UV index in August in Santa Rosa is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from exposure to Sun's UV rays.
Average high temperature
Average low temperature
Average pressure
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Santa Rosa, CA

Average temperature in August - Santa Rosa, CA
  • Average high temperature in August: 79.7°F

The warmest month (with the highest average high temperature) is August (79.7°F).
The month with the lowest average high temperature is December (55.6°F).

  • Average low temperature in August: 54.7°F

The months with the highest average low temperature are August and September (54.7°F).
The coldest month (with the lowest average low temperature) is December (41.9°F).

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Average pressure in August
Santa Rosa, CA

Average pressure in August - Santa Rosa, CA
  • Average pressure in August: 29.92"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).

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Average wind speed in August
Santa Rosa, CA

Average wind speed in August - Santa Rosa, CA
  • Average wind speed in August: 5.2mph

The windiest month (with the highest average wind speed) is May (7.1mph).
The calmest month (with the lowest average wind speed) is November (4.9mph).

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Average humidity in August
Santa Rosa, CA

Average humidity in August - Santa Rosa, CA
  • Average humidity in August: 67%

The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is September (63%).

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Average rainfall in August
Santa Rosa, CA

Average rainfall in August - Santa Rosa, CA
  • Average rainfall in August: 0.04"

The wettest month (with the highest rainfall) is February (2.64").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in August
Santa Rosa, CA

Average rainfall days in August - Santa Rosa, CA
  • Average rainfall days in August: 0.8 days

The month with the highest number of rainy days is March (12.6 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
Santa Rosa, CA

Average daylight in August / Average sunshine in August - Santa Rosa, CA
  • Average daylight in August: 13h and 4min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in August: 11h and 5min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).

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Average sunshine days in August
Santa Rosa, CA

Average sunshine days in August - Santa Rosa, CA
  • Average sunshine days in August: 27.1 days

The month with the most sunshine days is July (27.2 days).
The month with the least sunshine days is March (17.1 days).

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Average UV index in August
Santa Rosa, CA

Average UV index in August - Santa Rosa, CA
  • Average UV index in August: 5

The month with the highest UV index is June (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
Santa Rosa, CA

Average cloud cover in August - Santa Rosa, CA
  • Average cloud cover in August: 10

The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is July (Cloud cover 9).

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Average visibility in August
Santa Rosa, CA

Average visibility in August - Santa Rosa, 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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Santa Rosa, California, USA

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