September weather forecast
Twin Peaks, CA

Weather in September

The first month of the autumn, September, is also a moderately hot month in Twin Peaks, California, with temperature in the range of an average high of 85.8°F (29.9°C) and an average low of 62.4°F (16.9°C).

Temperature

In September, the average high-temperature is almost the same as in August - a warm 85.8°F (29.9°C). In September, the average low-temperature is 62.4°F (16.9°C).

Humidity

In Twin Peaks, California, the average relative humidity in September is 39%.

Rainfall

In Twin Peaks, during September, the rain falls for 2.6 days and regularly aggregates up to 0.12" (3mm) of precipitation. Throughout the year, there are 51.8 rainfall days, and 6.69" (170mm) of precipitation is accumulated.

Snowfall

In Twin Peaks, snow does not fall in January, March through December.

Daylight

In Twin Peaks, California, the average length of the day in September is 12h and 22min.
On the first day of the month, sunrise is at 6:22 am and sunset at 7:15 pm. On the last day of September, in Twin Peaks, sunrise is at 6:42 am and sunset at 6:35 pm PDT.

Sunshine

In Twin Peaks, the average sunshine in September is 10.7h.

UV index

In Twin Peaks, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 6 in September interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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 Twin Peaks?

In Twin Peaks, California, in September, the average high-temperature is 85.8°F (29.9°C), and the average low-temperature is 62.4°F (16.9°C). in June, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which represents the influence of relative humidity on air temperature, is evaluated at 84.2°F (29°C).

What is the average humidity in September in Twin Peaks?

The average relative humidity in September in Twin Peaks is 39%.

How many days does it rain in September in Twin Peaks?

In Twin Peaks, during September, the rain falls for 2.6 days and regularly aggregates up to 0.12" (3mm) of precipitation.

When it does not snow in Twin Peaks?

In Twin Peaks, snow does not fall in January, March through December.

How many hours of daylight does Twin Peaks have in September?

In September, the average day length in Twin Peaks, California, is 12h and 22min.

When are sunrise and sunset in September in Twin Peaks?

On the first day of September, sunrise is at 6:22 am and sunset at 7:15 pm. On the last day of the month, sunrise is at 6:42 am and sunset at 6:35 pm PDT.

How long on average sun shines in September in Twin Peaks?

The average sunshine duration in September is 10.7h.

What is the UV index intensity in September in Twin Peaks?

In Twin Peaks, California, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Twin Peaks, CA

Average temperature in September - Twin Peaks, CA
  • Average high temperature in September: 85.8°F

The warmest month (with the highest average high temperature) is August (90.9°F).
The month with the lowest average high temperature is December (57.7°F).

  • Average low temperature in September: 62.4°F

The month with the highest average low temperature is August (66.6°F).
The coldest months (with the lowest average low temperature) are February and December (41.5°F).

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Average pressure in September
Twin Peaks, CA

Average pressure in September - Twin Peaks, CA
  • Average pressure in September: 29.86"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

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Average wind speed in September
Twin Peaks, CA

Average wind speed in September - Twin Peaks, CA
  • Average wind speed in September: 4.8mph

The windiest month (with the highest average wind speed) is April (6.6mph).
The calmest month (with the lowest average wind speed) is September (4.8mph).

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Average humidity in September
Twin Peaks, CA

Average humidity in September - Twin Peaks, CA
  • Average humidity in September: 39%

The month with the highest relative humidity is February (52%).
The month with the lowest relative humidity is August (36%).

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Average rainfall in September
Twin Peaks, CA

Average rainfall in September - Twin Peaks, CA
  • Average rainfall in September: 0.12"

The wettest month (with the highest rainfall) is December (1.42").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
Twin Peaks, CA

Average rainfall days in September - Twin Peaks, CA
  • Average rainfall days in September: 2.6 days

The month with the highest number of rainy days is March (7.3 days).
The month with the least rainy days is June (1.3 days).

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Average snowfall days in September
Twin Peaks, CA

Average snowfall days in September - Twin Peaks, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

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Average daylight in September /
Average sunshine in September
Twin Peaks, CA

Average daylight in September / Average sunshine in September - Twin Peaks, CA
  • Average daylight in September: 12h and 22min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 55min).

  • Average sunshine in September: 10h and 42min

The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).

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Average sunshine days in September
Twin Peaks, CA

Average sunshine days in September - Twin Peaks, CA
  • Average sunshine days in September: 25.7 days

The month with the most sunshine days is June (28.5 days).
The month with the least sunshine days is February (20.9 days).

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Average UV index in September
Twin Peaks, CA

Average UV index in September - Twin Peaks, CA
  • Average UV index in September: 6

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are November and December (UV index 3).

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Average cloud cover in September
Twin Peaks, CA

Average cloud cover in September - Twin Peaks, CA
  • Average cloud cover in September: 6

The months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in September
Twin Peaks, CA

Average visibility in September - Twin Peaks, 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).

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