September weather forecast and climate
Sierraville, CA

Weather in September

September, the first month of the autumn, in Sierraville, is still a warm month, with average temperature ranging between min 42.3°F (5.7°C) and max 73.8°F (23.2°C).

Temperature

In Sierraville, the average high-temperature in September slightly decreases, from a warm 81.1°F (27.3°C) in August, to a still moderately hot 73.8°F (23.2°C). The average low-temperature, in Sierraville, is 42.3°F (5.7°C).

Humidity

The average relative humidity in Sierraville is 46%.

Rainfall

In Sierraville, during September, the rain falls for 4.5 days and regularly aggregates up to 0.43" (11mm) of precipitation. Throughout the year, in Sierraville, California, there are 80.1 rainfall days, and 22.95" (583mm) of precipitation is accumulated.

Snowfall

January through June, September through December are months with snowfall. September is the first month it typically snows in Sierraville. Throughout September, in the average 0.4 snowfall days, it receives 1.02" (26mm) of snow. Throughout the year, there are 69.3 snowfall days, and 103.5" (2629mm) of snow is accumulated.

Daylight

In Sierraville, the average length of the day is 12.4h.

Sunshine

In Sierraville, California, the average sunshine is 11h.

UV index

The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 3 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. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in September in Sierraville?

The average high-temperature, in September, is 73.8°F (23.2°C), while the average low-temperature is 42.3°F (5.7°C).

What is the average humidity in September in Sierraville?

In Sierraville, the average relative humidity in September is 46%.

How many days does it rain in September in Sierraville?

In Sierraville, in September, it is raining for 4.5 days, with typically 0.43" (11mm) of accumulated precipitation.

When does it start snowing in Sierraville?

September is the first month it typically snows. Throughout September, in the average 0.4 snowfall days, it receives 1.02" (26mm) of snow.

What is the average length of the day in September in Sierraville?

The average length of the day in September is 12.4h.

How many hours of sunshine does Sierraville have in September?

In September, the average sunshine is 11h.

What is the UV index intensity in September in Sierraville?

In Sierraville, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate health threat from unprotected exposure to the UV radiation.

Average temperature in September
Sierraville, CA

Average temperature in September - Sierraville, CA
  • Average high temperature in September: 73.8°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is December (37.2°F).

  • Average low temperature in September: 42.3°F

The month with the highest average low temperature is July (47.5°F).
The coldest month (with the lowest average low temperature) is December (21.6°F).

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Average pressure in September
Sierraville, CA

Average pressure in September - Sierraville, CA
  • Average pressure in September: 29.93"

The month with the highest atmospheric pressure is January (30.19").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in September
Sierraville, CA

Average wind speed in September - Sierraville, CA
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is March (6.6mph).
The calmest months (with the lowest average wind speed) are August and September (5.2mph).

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Average humidity in September
Sierraville, CA

Average humidity in September - Sierraville, CA
  • Average humidity in September: 46%

Months with the highest relative humidity are January and March (81%).
Months with the lowest relative humidity are July and August (40%).

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Average rainfall in September
Sierraville, CA

Average rainfall in September - Sierraville, CA
  • Average rainfall in September: 0.43"

The wettest month (with the highest rainfall) is March (4.02").
The driest month (with the least rainfall) is August (0.2").

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Average rainfall days in September
Sierraville, CA

Average rainfall days in September - Sierraville, CA
  • Average rainfall days in September: 4.5 days

The month with the highest number of rainy days is May (11.8 days).
The month with the least rainy days is July (3.3 days).

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Average snowfall in September
Sierraville, CA

Average snowfall in September - Sierraville, CA
  • Average snowfall in September: 1.02"

The month with the highest snowfall is December (22.52").
Months with the least snowfall are July and August (0").

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Average snowfall days in September
Sierraville, CA

Average snowfall days in September - Sierraville, CA
  • Average snowfall days in September: 0.4 days

The month with the highest number of snowfall days is March (14.7 days).
Months with the least snowfall days are July and August (0 days).

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Average daylight in September /
Average sunshine in September
Sierraville, CA

Average daylight in September / Average sunshine in September - Sierraville, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in September: 11h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is January (Average sunshine: 5h).

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Average sunshine days in September
Sierraville, CA

Average sunshine days in September - Sierraville, CA
  • Average sunshine days in September: 25 days

The month with the most sunshine days is August (26 days).
The month with the least sunshine days is March (11.8 days).

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Average UV index in September
Sierraville, CA

Average UV index in September - Sierraville, CA
  • Average UV index in September: 3

Months with the highest UV index are June, July and August (UV index 5).
The month with the lowest UV index is November (UV index 1).

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Average cloud cover in September
Sierraville, CA

Average cloud cover in September - Sierraville, CA
  • Average cloud cover in September: 12

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 7).

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Average visibility in September
Sierraville, CA

Average visibility in September - Sierraville, CA
  • Average visibility in September: 6mi

Months with the highest visibility are May, June, July, August, September, October and November (6mi).
Months with the lowest visibility are January and December (4mi).

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