September weather forecast and climate
Hat Creek, CA

Weather in September

The first month of the autumn, September, is still a warm month in Hat Creek, California, with average temperature varying between 78.8°F (26°C) and 48°F (8.9°C).

Temperature

In September, the average high-temperature marginally drops, from a moderately hot 85.8°F (29.9°C) in August, to a still warm 78.8°F (26°C). In September, the average low-temperature is 48°F (8.9°C).

Humidity

The average relative humidity in Hat Creek is 45%.

Rainfall

In September, the rain falls for 4.1 days. Throughout September, 0.39" (10mm) of precipitation is accumulated. Throughout the year, there are 105 rainfall days, and 24.69" (627mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall.

Daylight

The average length of the day is 12.4h.

Sunshine

The average sunshine in Hat Creek, California, is 11.1h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 4 transform into the following instructions:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in September in Hat Creek?

In Hat Creek, California, in September, the average high-temperature is 78.8°F (26°C), and the average low-temperature is 48°F (8.9°C).

What is the average humidity in September in Hat Creek?

In September, the average relative humidity is 45%.

How much does it rain in Hat Creek in September?

In Hat Creek, in September, it is raining for 4.1 days, with typically 0.39" (10mm) of accumulated precipitation.

Does it snow in Hat Creek in September?

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

When it does not snow in Hat Creek?

June through September are months without snowfall.

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

In September, the average length of the day in Hat Creek is 12.4h.

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

In September, the average sunshine is 11.1h.

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

In Hat Creek, California, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health threat from the exposure to the Sun's UV radiation.

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"

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

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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%

Months with the highest relative humidity are January and March (79%).
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").
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).
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: 12.4h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 11.1h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.7h).

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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

Months with the highest UV index are June and July (UV index 6).
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).
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

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

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