September weather forecast and climate
Posts, CA

Weather in September

The first month of the autumn, September, is still a pleasant month in Posts, California, with average temperature fluctuating between 69.6°F (20.9°C) and 55.4°F (13°C).

Temperature

With an average high-temperature of 69.6°F (20.9°C) and an average low-temperature of 55.4°F (13°C), September is the warmest month.

Humidity

In September, the average relative humidity in Posts is 75%.

Rainfall

In Posts, during 2.4 rainfall days, 0.08" (2mm) of precipitation is typically accumulated. Throughout the year, there are 70 rainfall days, and 11.93" (303mm) of precipitation is accumulated.

Daylight

The average length of the day in September is 12.4h.

Sunshine

In Posts, the average sunshine is 11h.

UV index

Months with the highest UV index are June through September, with an average maximum UV index of 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 warmest month in Posts?

The warmest month is September, with an average high-temperature of 69.6°F (20.9°C) and an average low-temperature of 55.4°F (13°C).

What is the temperature in September in Posts?

In Posts, in September, the average high-temperature is 69.6°F (20.9°C), and the average low-temperature is 55.4°F (13°C).

What is the average humidity in September in Posts?

In Posts, California, the average relative humidity in September is 75%.

How many days does it rain in September in Posts?

In Posts, in September, during 2.4 rainfall days, 0.08" (2mm) of precipitation is typically accumulated.

How many hours of daylight does Posts have in September?

The average length of the day in September is 12.4h.

How many hours of sunshine does Posts have in September?

In September, the average sunshine in Posts is 11h.

What is the month with the highest UV index in Posts?

June through September, with an average maximum UV index of 5, are months with the highest UV index in Posts, California.

How high is the UV index in September in Posts?

In Posts, California, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health risk from unsafe exposure to the Sun's UV rays.

Average temperature in September
Posts, CA

Average temperature in September - Posts, CA
  • Average high temperature in September: 69.6°F

The warmest month (with the highest average high temperature) is September (69.6°F).
The month with the lowest average high temperature is December (57°F).

  • Average low temperature in September: 55.4°F

The month with the highest average low temperature is September (55.4°F).
The coldest month (with the lowest average low temperature) is December (46.9°F).

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Average pressure in September
Posts, CA

Average pressure in September - Posts, CA
  • Average pressure in September: 29.93"

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are June, August and September (29.93").

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Average wind speed in September
Posts, CA

Average wind speed in September - Posts, CA
  • Average wind speed in September: 6.3mph

The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).

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Average humidity in September
Posts, CA

Average humidity in September - Posts, CA
  • Average humidity in September: 75%

The month with the highest relative humidity is August (79%).
The month with the lowest relative humidity is November (70%).

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Average rainfall in September
Posts, CA

Average rainfall in September - Posts, CA
  • Average rainfall in September: 0.08"

The wettest month (with the highest rainfall) is December (2.48").
The driest month (with the least rainfall) is August (0.04").

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Average rainfall days in September
Posts, CA

Average rainfall days in September - Posts, CA
  • Average rainfall days in September: 2.4 days

The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is August (1.3 days).

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

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

The month with the longest days is June (Average daylight: 14.6h).
The month with the shortest days is December (Average daylight: 9.7h).

  • Average sunshine in September: 11h

The month with the most sunshine is July (Average sunshine: 11.9h).
The month with the least sunshine is December (Average sunshine: 5.9h).

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Average sunshine days in September
Posts, CA

Average sunshine days in September - Posts, CA
  • Average sunshine days in September: 26.8 days

The month with the most sunshine days is August (27.8 days).
The month with the least sunshine days is March (17.3 days).

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Average UV index in September
Posts, CA

Average UV index in September - Posts, CA
  • Average UV index in September: 5

Months with the highest UV index are June, July, August and September (UV index 5).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in September
Posts, CA

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

The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 13).

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Average visibility in September
Posts, CA

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

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

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