September weather forecast
Sierraville, CA

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Sierraville, California, with an average temperature fluctuating between 73.8°F (23.2°C) and 42.3°F (5.7°C).

Temperature

September's arrival signals a moderate reduction in the average high-temperature, easing from a warm 81.1°F (27.3°C) in August to a still moderately hot 73.8°F (23.2°C). The nighttime temperature in Sierraville during September displays a significant divergence from daily peaks, averaging at an icy 42.3°F (5.7°C).

Humidity

The average relative humidity in September in Sierraville is 46%.

Rainfall

In September, the rain falls for 4.5 days. Throughout September, 0.43" (11mm) of precipitation is accumulated. In Sierraville, during the entire year, the rain falls for 80.1 days and collects up to 22.95" (583mm) of precipitation.

Snowfall

Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 0.4 snowfall days, it receives 1.02" (26mm) of snow. In Sierraville, during the entire year, snow falls for 69.3 days and aggregates up to 103.5" (2629mm) of snow.

Daylight

In September, the average length of the day in Sierraville is 12h and 26min.
On the first day of September in Sierraville, California, sunrise is at 6:30 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:44 pm PDT.

Sunshine

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

UV index

In September, the average daily maximum UV index in Sierraville is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily high UV index of 3 during September translates into the following recommendations:
Heed the precautions - Suggestions to avoid sunburn are made. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
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Frequently asked questions

What is the temperature in September in Sierraville?

The average high-temperature and low-temperature during September are 73.8°F (23.2°C) and 42.3°F (5.7°C) respectively. In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is estimated at 80.6°F (27°C).

What is the average humidity in September in Sierraville?

The average relative humidity in September in Sierraville is 46%.

How much does it rain in Sierraville in September?

In Sierraville, California, during September, the rain falls for 4.5 days and regularly aggregates up to 0.43" (11mm) of 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?

In Sierraville, the average day length in September is 12h and 26min.

What time are sunrise and sunset in September in Sierraville?

On the first day of September, sunrise is at 6:30 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:44 pm PDT.

How long on average sun shines in September in Sierraville?

In September, the average sunshine duration in Sierraville is 11h.

What is the UV index intensity in September in Sierraville?

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

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"Hg

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

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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%

The months with the highest relative humidity are January and March (81%).
The 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").
The 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).
The 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: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • 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

The 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

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

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Sierraville, California, USA

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