September weather forecast
Santa Rosa, CA

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 September

The first month of the autumn, September, is also a moderately hot month in Santa Rosa, California, with an average temperature varying between 79°F (26.1°C) and 54.7°F (12.6°C).

Temperature

In September, the average high-temperature is essentially the same as in August - a still moderately hot 79°F (26.1°C). The average low-temperature, in Santa Rosa, California, is 54.7°F (12.6°C).

Humidity

The least humid month in Santa Rosa is September, with an average relative humidity of 63%.

Rainfall

In Santa Rosa, during 2.8 rainfall days, 0.12" (3mm) of precipitation is typically accumulated. Throughout the year, there are 72.8 rainfall days, and 12.01" (305mm) of precipitation is accumulated.

Daylight

In Santa Rosa, the average length of the day in September is 12h and 25min.
On the first day of the month, sunrise is at 6:40 am and sunset at 7:40 pm. On the last day of September, sunrise is at 7:06 am and sunset at 6:55 pm PDT.

Sunshine

In September, the average sunshine is 11h.

UV index

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 5 in September 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 least humid month in Santa Rosa?

The least humid month in Santa Rosa, California, is September, with an average relative humidity of 63%.

What is the average humidity in September in Santa Rosa?

In September, the average relative humidity in Santa Rosa, California, is 63%.

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

In September, in Santa Rosa, California, the rain falls for 2.8 days. Throughout September, 0.12" (3mm) of precipitation is accumulated.

What is the average length of the day in September in Santa Rosa?

In Santa Rosa, the average day length in September is 12h and 25min.

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

On the first day of September, sunrise is at 6:40 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 6:55 pm PDT.

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

The average sunshine duration in September in Santa Rosa, California, is 11h.

What is the UV index intensity in September in Santa Rosa?

In Santa Rosa, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Santa Rosa, CA

Average temperature in September - Santa Rosa, CA
  • Average high temperature in September: 79°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 September: 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 September
Santa Rosa, CA

Average pressure in September - Santa Rosa, CA
  • Average pressure in September: 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 September
Santa Rosa, CA

Average wind speed in September - Santa Rosa, CA
  • Average wind speed in September: 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 September
Santa Rosa, CA

Average humidity in September - Santa Rosa, CA
  • Average humidity in September: 63%

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 September
Santa Rosa, CA

Average rainfall in September - Santa Rosa, CA
  • Average rainfall in September: 0.12"

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 September
Santa Rosa, CA

Average rainfall days in September - Santa Rosa, CA
  • Average rainfall days in September: 2.8 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 September /
Average sunshine in September
Santa Rosa, CA

Average daylight in September / Average sunshine in September - Santa Rosa, CA
  • Average daylight in September: 12h and 25min

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 32min).

  • Average sunshine in September: 11h and 0min

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 September
Santa Rosa, CA

Average sunshine days in September - Santa Rosa, CA
  • Average sunshine days in September: 26.5 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 September
Santa Rosa, CA

Average UV index in September - Santa Rosa, CA
  • Average UV index in September: 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 September
Santa Rosa, CA

Average cloud cover in September - Santa Rosa, CA
  • Average cloud cover in September: 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 September
Santa Rosa, CA

Average visibility in September - Santa Rosa, CA
  • Average visibility in September: 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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