September weather forecastShasta Lake, CA
September
Weather in September
September, the first month of the autumn in Shasta Lake, is also a moderately hot month, with an average temperature fluctuating between 84.2°F (29°C) and 55.6°F (13.1°C).Temperature
With the onset of September, Shasta Lake's climate undergoes a slight change as the average high-temperature moves from a hot 91.2°F (32.9°C) in August to a warm 84.2°F (29°C). Significant variation from daytime temperatures marks September, with the month recording a nightly average of 55.6°F (13.1°C).Humidity
In September, the average relative humidity in Shasta Lake is 39%.Rainfall
In Shasta Lake, in September, during 3.5 rainfall days, 0.35" (9mm) of precipitation is typically accumulated. Throughout the year, there are 99.5 rainfall days, and 30.43" (773mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 27min.On the first day of the month, sunrise is at 6:37 am and sunset at 7:41 pm. On the last day of September, sunrise is at 7:05 am and sunset at 6:52 pm PDT.
Sunshine
The average sunshine in September in Shasta Lake is 11.1h.UV index
In September, the average daily maximum UV index in Shasta Lake is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.Note: In September, the maximum UV index of 5 transforms into these recommendations:
Undertake protective steps - Preventing sun damage is advised. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Shasta Lake, CA
- Average high temperature in September: 84.2°F
The warmest month (with the highest average high temperature) is July (92.3°F).
The month with the lowest average high temperature is December (49.3°F).
- Average low temperature in September: 55.6°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is December (35.2°F).
Average pressure in September
Shasta Lake, CA
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The months with the lowest atmospheric pressure are June and August (29.92"Hg).
Average wind speed in September
Shasta Lake, CA
- Average wind speed in September: 4.8mph
The windiest months (with the highest average wind speed) are March, April, June and October (5.2mph).
The calmest months (with the lowest average wind speed) are August and November (4.4mph).
Average humidity in September
Shasta Lake, CA
- Average humidity in September: 39%
The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is August (35%).
Average rainfall in September
Shasta Lake, CA
- Average rainfall in September: 0.35"
The wettest month (with the highest rainfall) is March (5.91").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in September
Shasta Lake, CA
- Average rainfall days in September: 3.5 days
The month with the highest number of rainy days is March (16.8 days).
The month with the least rainy days is August (1.6 days).
Average snowfall in September
Shasta Lake, CA
- Average snowfall in September: 0"
The month with the highest snowfall is December (0.63").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Shasta Lake, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Shasta Lake, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 11h and 6min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in September
Shasta Lake, CA
- Average sunshine days in September: 25.1 days
The month with the most sunshine days is August (27.3 days).
The month with the least sunshine days is March (12.7 days).
Average UV index in September
Shasta Lake, CA
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are February, November and December (UV index 2).
Average cloud cover in September
Shasta Lake, CA
- Average cloud cover in September: 9
The month with the most cloud cover is March (Cloud cover 43).
The months with the least cloud cover are July and August (Cloud cover 5).
Average visibility in September
Shasta Lake, 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).
