September weather forecast
Shasta Lake, CA

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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.
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is it in Shasta Lake in September?

September temperatures in Shasta Lake vary between a high-temperature of 84.2°F (29°C) and a low-temperature of 55.6°F (13.1°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in June is calculated to be 84.2°F (29°C).

What is the average humidity in September in Shasta Lake?

In Shasta Lake, the average relative humidity in September is 39%.

How much does it rain in Shasta Lake in September?

In September, the rain falls for 3.5 days. Throughout September, 0.35" (9mm) of precipitation is accumulated.

When it does not snow in Shasta Lake?

April through October are months without snowfall in Shasta Lake, California.

How many hours of daylight does Shasta Lake have in September?

The average day length in September in Shasta Lake is 12h and 27min.

When are sunrise and sunset in September in Shasta Lake?

On the first day of September in Shasta Lake, sunrise is at 6:37 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:52 pm PDT.

How many hours of sunshine does Shasta Lake have in September?

In Shasta Lake, the average sunshine duration in September is 11.1h.

What is the UV index intensity in September in Shasta Lake?

The average daily maximum UV index in September in Shasta Lake, California, is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Shasta Lake, CA

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / Average sunshine in September - Shasta Lake, CA
  • Average daylight in September: 12h and 2min

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 1min

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 - 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 - 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 - 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 - 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).

Shasta Lake, California, USA

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