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

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

Temperature

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

Humidity

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

Rainfall

In Santa Rosa, it is raining for 2.8 days, with typically 0.12" (3mm) of accumulated precipitation. In Santa Rosa, during the entire year, the rain falls for 72.8 days and collects up to 12.01" (305mm) of precipitation.

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 7:41 pm. On the last day of September, in Santa Rosa, California, sunrise is at 7:05 am and sunset at 6:55 pm PDT.

Sunshine

In Santa Rosa, the average sunshine in September is 11h.

UV index

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. 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 the 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.
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FAQ

What is the temperature in September in Santa Rosa?

In September, in Santa Rosa, California, the average high-temperature is 79°F (26.1°C), and the average low-temperature is 54.7°F (12.6°C).

What is the least humid month in Santa Rosa?

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

What is the average humidity in September in Santa Rosa?

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

How much does it rain in Santa Rosa in September?

In Santa Rosa, during September, the rain falls for 2.8 days and regularly aggregates up to 0.12" (3mm) of precipitation.

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

The average day length in September is 12h and 25min.

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

In September, on the first day of the month, sunrise is at 6:40 am and sunset at 7:41 pm. On the last day of the month, in Santa Rosa, sunrise is at 7:05 am and sunset at 6:55 pm PDT.

How long on average sun shines in September in Santa Rosa?

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

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

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from unsafe exposure to Sun's UV rays.
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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