September weather forecast and climate
Hayfork, CA

Weather in September

The first month of the autumn, September, is still a warm month in Hayfork, California, with average temperature ranging between min 47.1°F (8.4°C) and max 79.7°F (26.5°C).

Temperature

In Hayfork, the average high-temperature slightly decreases, from a hot 86.5°F (30.3°C) in August, to a warm 79.7°F (26.5°C). In Hayfork, the average low-temperature is 47.1°F (8.4°C).

Humidity

The average relative humidity in Hayfork, California, is 55%.

Rainfall

In Hayfork, during 3.6 rainfall days, 0.39" (10mm) of precipitation is typically accumulated. Throughout the year, there are 99.6 rainfall days, and 25.04" (636mm) of precipitation is accumulated.

Snowfall

In Hayfork snow does not fall in June through October.

Daylight

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

Sunshine

In Hayfork, the average sunshine is 10.7h.

UV index

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against sunburn is recommended. 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.
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FAQ

What is the temperature in September in Hayfork?

In Hayfork, California, in September, the average high-temperature is 79.7°F (26.5°C), and the average low-temperature is 47.1°F (8.4°C).

What is the average humidity in September in Hayfork?

In September, the average relative humidity in Hayfork, California, is 55%.

How much does it rain in Hayfork in September?

In Hayfork, California, during September, the rain falls for 3.6 days and regularly aggregates up to 0.39" (10mm) of precipitation.

When it does not snow in Hayfork?

In Hayfork snow does not fall in June through October.

How many hours of daylight does Hayfork have in September?

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

How many hours of sunshine does Hayfork have in September?

In Hayfork, California, the average sunshine in September is 10.7h.

What is the UV index intensity in September in Hayfork?

In September, the average daily maximum UV index in Hayfork, California, is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in September
Hayfork, CA

Average temperature in September - Hayfork, CA
  • Average high temperature in September: 79.7°F

The warmest months (with the highest average high temperature) are July and August (86.5°F).
The month with the lowest average high temperature is December (46°F).

  • Average low temperature in September: 47.1°F

The month with the highest average low temperature is July (51.1°F).
The coldest month (with the lowest average low temperature) is December (30.2°F).

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Average pressure in September
Hayfork, CA

Average pressure in September - Hayfork, CA
  • Average pressure in September: 29.95"

The month with the highest atmospheric pressure is January (30.15").
The month with the lowest atmospheric pressure is August (29.93").

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Average wind speed in September
Hayfork, CA

Average wind speed in September - Hayfork, CA
  • Average wind speed in September: 3.6mph

The windiest month (with the highest average wind speed) is April (4.8mph).
The calmest month (with the lowest average wind speed) is August (3.3mph).

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Average humidity in September
Hayfork, CA

Average humidity in September - Hayfork, CA
  • Average humidity in September: 55%

The month with the highest relative humidity is March (81%).
The month with the lowest relative humidity is August (52%).

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Average rainfall in September
Hayfork, CA

Average rainfall in September - Hayfork, CA
  • Average rainfall in September: 0.39"

The wettest month (with the highest rainfall) is December (4.17").
The driest month (with the least rainfall) is July (0.16").

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Average rainfall days in September
Hayfork, CA

Average rainfall days in September - Hayfork, CA
  • Average rainfall days in September: 3.6 days

The month with the highest number of rainy days is March (15.3 days).
The month with the least rainy days is August (2.3 days).

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Average snowfall in September
Hayfork, CA

Average snowfall in September - Hayfork, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (7.52").
Months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in September
Hayfork, CA

Average snowfall days in September - Hayfork, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (5 days).
Months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Hayfork, CA

Average daylight in September / Average sunshine in September - Hayfork, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 10.7h

Months with the most sunshine are July and August (Average sunshine: 11.9h).
The month with the least sunshine is December (Average sunshine: 4.7h).

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Average sunshine days in September
Hayfork, CA

Average sunshine days in September - Hayfork, CA
  • Average sunshine days in September: 25.3 days

The month with the most sunshine days is July (26 days).
The month with the least sunshine days is March (13.6 days).

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Average UV index in September
Hayfork, CA

Average UV index in September - Hayfork, 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
Hayfork, CA

Average cloud cover in September - Hayfork, CA
  • Average cloud cover in September: 15

The month with the most cloud cover is March (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 7).

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Average visibility in September
Hayfork, CA

Average visibility in September - Hayfork, CA
  • Average visibility in September: 6mi

Months with the highest visibility are May, June, July, August, September and October (6mi).
Months with the lowest visibility are March and December (4mi).

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