September weather forecast
Whitethorn, CA

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Weather in September

September, the first month of the autumn in Whitethorn, is also an agreeable month, with temperature in the range of an average high of 69.8°F (21°C) and an average low of 54.3°F (12.4°C).

Temperature

In Whitethorn, temperatures reach their average annual highs in September, measuring 69.8°F (21°C) and a minimum average of 54.3°F (12.4°C).

Humidity

September is the least humid month, with an average relative humidity of 72%.

Rainfall

In Whitethorn, in September, during 3.5 rainfall days, 0.47" (12mm) of precipitation is typically accumulated. Throughout the year, there are 102.7 rainfall days, and 28.78" (731mm) of precipitation is accumulated.

Snowfall

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

Daylight

The average length of the day in September in Whitethorn is 12h and 26min.
On the first day of the month, sunrise is at 6:44 am and sunset at 7:46 pm. On the last day of September, in Whitethorn, sunrise is at 7:11 am and sunset at 6:59 pm PDT.

Sunshine

In September, the average sunshine is 10.4h.

UV index

In Whitethorn, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum UV index of 4 during September translates into these guidelines:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.

Frequently asked questions

What time of the year is the hottest in Whitethorn?

During the warmest month in Whitethorn, September, temperatures average a high of 69.8°F (21°C) and a low of 54.3°F (12.4°C).

What are September temperatures in Whitethorn?

In Whitethorn, in September, the average high-temperature is 69.8°F (21°C), and the average low-temperature is 54.3°F (12.4°C).

What is the least humid month in Whitethorn?

The least humid month in Whitethorn is September, with an average relative humidity of 72%.

What is the average humidity in September in Whitethorn?

In September, the average relative humidity in Whitethorn is 72%.

How much does it rain in Whitethorn in September?

In Whitethorn, California, in September, it is raining for 3.5 days, with typically 0.47" (12mm) of accumulated precipitation.

When it does not snow in Whitethorn?

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

How many hours of daylight does Whitethorn have in September?

In Whitethorn, the average day length in September is 12h and 26min.

When is the sunrise / sunset in September in Whitethorn?

In September, on the first day of the month, sunrise is at 6:44 am and sunset at 7:46 pm. On the last day of the month, in Whitethorn, California, sunrise is at 7:11 am and sunset at 6:59 pm PDT.

How long on average sun shines in September in Whitethorn?

The average sunshine duration in September in Whitethorn is 10.4h.

How high is the UV index in September in Whitethorn?

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Whitethorn, CA

Average temperature in September - Whitethorn, CA
  • Average high temperature in September: 69.8°F

The warmest month (with the highest average high temperature) is September (69.8°F).
The month with the lowest average high temperature is December (53.4°F).

  • Average low temperature in September: 54.3°F

The months with the highest average low temperature are July, August and September (54.3°F).
The coldest month (with the lowest average low temperature) is February (43.5°F).

Average pressure in September
Whitethorn, CA

Average pressure in September - Whitethorn, CA
  • Average pressure in September: 29.95"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are August and September (29.95"Hg).

Average wind speed in September
Whitethorn, CA

Average wind speed in September - Whitethorn, CA
  • Average wind speed in September: 8.1mph

The windiest month (with the highest average wind speed) is June (10.6mph).
The calmest months (with the lowest average wind speed) are January and August (7.8mph).

Average humidity in September
Whitethorn, CA

Average humidity in September - Whitethorn, CA
  • Average humidity in September: 72%

The month with the highest relative humidity is March (81%).
The month with the lowest relative humidity is September (72%).

Average rainfall in September
Whitethorn, CA

Average rainfall in September - Whitethorn, CA
  • Average rainfall in September: 0.47"

The wettest month (with the highest rainfall) is December (5.31").
The driest month (with the least rainfall) is July (0.08").

Average rainfall days in September
Whitethorn, CA

Average rainfall days in September - Whitethorn, CA
  • Average rainfall days in September: 3.5 days

The month with the highest number of rainy days is March (16.4 days).
The month with the least rainy days is August (1.8 days).

Average snowfall days in September
Whitethorn, CA

Average snowfall days in September - Whitethorn, 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).

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

Average daylight in September / Average sunshine in September - Whitethorn, 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 24min).

  • Average sunshine in September: 10h and 2min

The months with the most sunshine are July and August (Average sunshine: 11h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).

Average sunshine days in September
Whitethorn, CA

Average sunshine days in September - Whitethorn, CA
  • Average sunshine days in September: 25.9 days

The month with the most sunshine days is July (28.4 days).
The month with the least sunshine days is March (13.1 days).

Average UV index in September
Whitethorn, CA

Average UV index in September - Whitethorn, CA
  • Average UV index in September: 4

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 3).

Average cloud cover in September
Whitethorn, CA

Average cloud cover in September - Whitethorn, CA
  • Average cloud cover in September: 14

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 10).

Average visibility in September
Whitethorn, CA

Average visibility in September - Whitethorn, 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).

Whitethorn, California, USA

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