September weather forecastSierra City, CA
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Sierra City, California, with temperature in the range of an average high of 73.8°F (23.2°C) and an average low of 42.3°F (5.7°C).Temperature
Start of September brings a slight shift in the average high-temperature, dipping a bit from August's warm 81.1°F (27.3°C) to a still moderately hot 73.8°F (23.2°C). Sierra City's average nighttime temperature descends significantly from the day's peak in September, settling at a cold 42.3°F (5.7°C).Humidity
The average relative humidity in September is 46%.Rainfall
In Sierra City, during September, the rain falls for 4.5 days and regularly aggregates up to 0.43" (11mm) of precipitation. Throughout the year, there are 80.1 rainfall days, and 22.95" (583mm) of precipitation is accumulated.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 Sierra City, 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 is 12h and 26min.On the first day of the month, sunrise is at 6:31 am and sunset at 7:32 pm. On the last day of September, sunrise is at 6:58 am and sunset at 6:45 pm PDT.
Sunshine
In Sierra City, the average sunshine in September is 11h.UV index
In Sierra City, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum UV index of 3 during September leads to these instructions:
Guard yourself - An obligation to protect skin and eyes from harm exists. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sierra City, 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).
Average pressure in September
Sierra City, 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).
Average wind speed in September
Sierra City, 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).
Average humidity in September
Sierra City, 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%).
Average rainfall in September
Sierra City, 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").
Average rainfall days in September
Sierra City, 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).
Average snowfall in September
Sierra City, 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").
Average snowfall days in September
Sierra City, 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).
Average daylight in September /
Average sunshine in September
Sierra City, CA
- Average daylight in September: 12h and 24min
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).
Average sunshine days in September
Sierra City, 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).
Average UV index in September
Sierra City, 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).
Average cloud cover in September
Sierra City, 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).
Average visibility in September
Sierra City, 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).
