September weather forecast
Hat Creek, CA

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Hat Creek, California, with an average temperature ranging between max 78.8°F (26°C) and min 48°F (8.9°C).

Temperature

With the arrival of September, Hat Creek experiences a modest decline in average high-temperatures, transitioning from 85.8°F (29.9°C) in August to a still warm 78.8°F (26°C). Nighttime in September brings a stark departure from the daily high, resting at an average low-temperature of 48°F (8.9°C).

Humidity

In September, the average relative humidity in Hat Creek is 45%.

Rainfall

In Hat Creek, California, in September, it is raining for 4.1 days, with typically 0.39" (10mm) of accumulated precipitation. In Hat Creek, during the entire year, the rain falls for 105 days and collects up to 24.69" (627mm) of precipitation.

Snowfall

In Hat Creek, snow does not fall in June through September.

Daylight

In Hat Creek, the average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 6:33 am and sunset at 7:38 pm. On the last day of September, sunrise is at 7:02 am and sunset at 6:49 pm PDT.

Sunshine

In September, the average sunshine in Hat Creek is 11.1h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: During September, 4 as the daily maximum UV index converts into the following advice:
Take measures. Individuals with light skin might experience burns in under 30 minutes. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
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Frequently asked questions

What are the temperatures in Hat Creek in September?

September temperatures vary between a high-temperature of 78.8°F (26°C) and a low-temperature of 48°F (8.9°C). The average heat index (a.k.a. 'feels like', 'real feel'), which combines relative humidity and air temperature, in August is estimated at 86°F (30°C).

What is the average humidity in September in Hat Creek?

In Hat Creek, California, the average relative humidity in September is 45%.

How much does it rain in Hat Creek in September?

In Hat Creek, in September, during 4.1 rainfall days, 0.39" (10mm) of precipitation is typically accumulated.

When it does not snow in Hat Creek?

June through September are months without snowfall in Hat Creek, California.

Does it snow in Hat Creek in September?

In Hat Creek, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September in Hat Creek?

In Hat Creek, California, the average day length in September is 12h and 27min.

When are sunrise and sunset in September in Hat Creek?

In September, on the first day of the month, sunrise is at 6:33 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:49 pm PDT.

How many hours of sunshine does Hat Creek have in September?

In Hat Creek, the average sunshine duration in September is 11.1h.

What is the UV index reading in September in Hat Creek?

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health risk from exposure to Sun's UV rays.
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
Hat Creek, CA

Average temperature in September - Hat Creek, CA
  • Average high temperature in September: 78.8°F

The warmest month (with the highest average high temperature) is July (86.7°F).
The month with the lowest average high temperature is December (43.3°F).

  • Average low temperature in September: 48°F

The month with the highest average low temperature is July (53.1°F).
The coldest month (with the lowest average low temperature) is December (27.9°F).

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Average pressure in September
Hat Creek, CA

Average pressure in September - Hat Creek, CA
  • Average pressure in September: 29.94"Hg

The month with the highest atmospheric pressure is January (30.18"Hg).
The months with the lowest atmospheric pressure are June and August (29.92"Hg).

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Average wind speed in September
Hat Creek, CA

Average wind speed in September - Hat Creek, CA
  • Average wind speed in September: 4.8mph

The windiest month (with the highest average wind speed) is March (5.8mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

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Average humidity in September
Hat Creek, CA

Average humidity in September - Hat Creek, CA
  • Average humidity in September: 45%

The months with the highest relative humidity are January and March (79%).
The months with the lowest relative humidity are July and August (40%).

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Average rainfall in September
Hat Creek, CA

Average rainfall in September - Hat Creek, CA
  • Average rainfall in September: 0.39"

The wettest month (with the highest rainfall) is March (4.45").
The driest month (with the least rainfall) is July (0.16").

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Average rainfall days in September
Hat Creek, CA

Average rainfall days in September - Hat Creek, CA
  • Average rainfall days in September: 4.1 days

The month with the highest number of rainy days is April (14.5 days).
The month with the least rainy days is August (2.3 days).

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Average snowfall in September
Hat Creek, CA

Average snowfall in September - Hat Creek, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is March (10.43").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Hat Creek, CA

Average snowfall days in September - Hat Creek, CA
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is March (8 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in September /
Average sunshine in September
Hat Creek, CA

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

The month with the longest days is June (Average daylight: 15h and 6min).
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 6min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).

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Average sunshine days in September
Hat Creek, CA

Average sunshine days in September - Hat Creek, CA
  • Average sunshine days in September: 24.7 days

The month with the most sunshine days is August (26 days).
The month with the least sunshine days is March (11.3 days).

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Average UV index in September
Hat Creek, CA

Average UV index in September - Hat Creek, CA
  • Average UV index in September: 4

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Hat Creek, CA

Average cloud cover in September - Hat Creek, CA
  • Average cloud cover in September: 10

The month with the most cloud cover is March (Cloud cover 42).
The months with the least cloud cover are July and August (Cloud cover 6).

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Average visibility in September
Hat Creek, CA

Average visibility in September - Hat Creek, CA
  • Average visibility in September: 6mi

The months with the highest visibility are February, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, March and December (5mi).

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Hat Creek, California, USA

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