September weather forecast
San Anselmo, CA

Weather in September

September, the first month of the autumn in San Anselmo, is still a pleasant month, with an average temperature ranging between min 56.1°F (13.4°C) and max 72.3°F (22.4°C).

Temperature

September is the warmest month, with an average high-temperature of 72.3°F (22.4°C) and an average low-temperature of 56.1°F (13.4°C).

Humidity

In San Anselmo, California, the average relative humidity in September is 71%.

Rainfall

June through September are months with the least rain in San Anselmo when the rain falls for 1.7 days and typically aggregates up to 0.04" (1mm) of rain.

Daylight

The average length of the day in September in San Anselmo is 12h and 25min.
On the first day of September in San Anselmo, sunrise is at 6:40 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:55 pm PDT.

Sunshine

The average sunshine in September in San Anselmo is 10.4h.

UV index

April, June through September, with an average maximum UV index of 5, are months with the highest UV index in San Anselmo. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, 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. 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 San Anselmo?

September is the warmest month in San Anselmo, California, with an average high-temperature of 72.3°F (22.4°C) and an average low-temperature of 56.1°F (13.4°C).

What is the temperature in September in San Anselmo?

In September, in San Anselmo, California, the average high-temperature is 72.3°F (22.4°C), and the average low-temperature is 56.1°F (13.4°C).

What is the average humidity in September in San Anselmo?

In San Anselmo, California, the average relative humidity in September is 71%.

What is the driest month in San Anselmo?

The months with the least rainfall are June through September Rain falls for 1.7 days and accumulates 0.04" (1mm) of rain.

How many days does it rain in September in San Anselmo?

In San Anselmo, California, in September, it is raining for 1.7 days, with typically 0.04" (1mm) of accumulated precipitation.

What is the average length of the day in September in San Anselmo?

In San Anselmo, California, the average day length in September is 12h and 25min.

When is the sunrise / sunset in September in San Anselmo?

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

How many hours of sunshine does San Anselmo have in September?

The average sunshine duration in September in San Anselmo, California, is 10.4h.

What are the months with the highest UV index in San Anselmo?

The months with the highest UV index in San Anselmo are April, June through September, with an average maximum UV index of 5.

What is the UV index intensity in September in San Anselmo?

The average daily maximum UV index in September in San Anselmo, California, is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
San Anselmo, CA

Average temperature in September - San Anselmo, CA
  • Average high temperature in September: 72.3°F

The warmest month (with the highest average high temperature) is September (72.3°F).
The month with the lowest average high temperature is December (55.4°F).

  • Average low temperature in September: 56.1°F

The month with the highest average low temperature is September (56.1°F).
The coldest month (with the lowest average low temperature) is December (45.3°F).

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Average pressure in September
San Anselmo, CA

Average pressure in September - San Anselmo, 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
San Anselmo, CA

Average wind speed in September - San Anselmo, CA
  • Average wind speed in September: 5.9mph

The windiest month (with the highest average wind speed) is May (7.8mph).
The calmest months (with the lowest average wind speed) are October and November (5.5mph).

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Average humidity in September
San Anselmo, CA

Average humidity in September - San Anselmo, CA
  • Average humidity in September: 71%

The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is October (68%).

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Average rainfall in September
San Anselmo, CA

Average rainfall in September - San Anselmo, CA
  • Average rainfall in September: 0.04"

The wettest month (with the highest rainfall) is February (0.87").
The driest months (with the least rainfall) are June, July, August and September (0.04").

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Average rainfall days in September
San Anselmo, CA

Average rainfall days in September - San Anselmo, CA
  • Average rainfall days in September: 1.7 days

The month with the highest number of rainy days is March (8.8 days).
The months with the least rainy days are June and August (1.2 days).

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Average daylight in September /
Average sunshine in September
San Anselmo, CA

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

The month with the longest days is June (Average daylight: 14h and 46min).
The month with the shortest days is December (Average daylight: 9h and 35min).

  • Average sunshine in September: 10h and 24min

The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).

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Average sunshine days in September
San Anselmo, CA

Average sunshine days in September - San Anselmo, CA
  • Average sunshine days in September: 26 days

The month with the most sunshine days is June (26.4 days).
The month with the least sunshine days is March (20.7 days).

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Average UV index in September
San Anselmo, CA

Average UV index in September - San Anselmo, CA
  • Average UV index in September: 5

The months with the highest UV index are April, June, July, August and September (UV index 5).
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
San Anselmo, CA

Average cloud cover in September - San Anselmo, CA
  • Average cloud cover in September: 19

The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is September (Cloud cover 19).

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Average visibility in September
San Anselmo, CA

Average visibility in September - San Anselmo, 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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