September weather forecast and climate
Fort Irwin, CA

Weather in September

September, the first month of the autumn, in Fort Irwin, is still a hot month, with average temperature fluctuating between 89.8°F (32.1°C) and 69.1°F (20.6°C).

Temperature

In September, the average high-temperature marginally drops, from a very hot 97.3°F (36.3°C) in August, to a hot 89.8°F (32.1°C). In Fort Irwin, in September, the average low-temperature is 69.1°F (20.6°C).

Humidity

In Fort Irwin, the average relative humidity is 25%.

Rainfall

In Fort Irwin, during September, the rain falls for 2.8 days and regularly aggregates up to 0.16" (4mm) of precipitation. In Fort Irwin, during the entire year, the rain falls for 39 days and collects up to 3.27" (83mm) of precipitation.

Snowfall

In Fort Irwin snow does not fall in February through December.

Daylight

The average length of the day in Fort Irwin is 12.4h.

Sunshine

The average sunshine in Fort Irwin is 10.6h.

UV index

In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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 Fort Irwin?

In Fort Irwin, California, in September, the average high-temperature is 89.8°F (32.1°C), and the average low-temperature is 69.1°F (20.6°C).

What is the average humidity in September in Fort Irwin?

In Fort Irwin, the average relative humidity in September is 25%.

How many days does it rain in September in Fort Irwin?

In September, in Fort Irwin, California, the rain falls for 2.8 days. Throughout September, 0.16" (4mm) of precipitation is accumulated.

When it does not snow in Fort Irwin?

In Fort Irwin snow does not fall in February through December.

How many hours of daylight does Fort Irwin have in September?

In Fort Irwin, California, the average length of the day in September is 12.4h.

How long on average sun shines in September in Fort Irwin?

In Fort Irwin, the average sunshine in September is 10.6h.

What is the UV index reading in September in Fort Irwin?

In September, the average daily maximum UV index in Fort Irwin is 6. A UV Index reading of 6 to 7 represents a high health risk from the exposure to the Sun's UV rays.

Average temperature in September
Fort Irwin, CA

Average temperature in September - Fort Irwin, CA
  • Average high temperature in September: 89.8°F

The warmest month (with the highest average high temperature) is July (98.2°F).
The month with the lowest average high temperature is December (55°F).

  • Average low temperature in September: 69.1°F

The month with the highest average low temperature is August (74.7°F).
The coldest month (with the lowest average low temperature) is December (40.1°F).

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Average pressure in September
Fort Irwin, CA

Average pressure in September - Fort Irwin, CA
  • Average pressure in September: 29.85"

The month with the highest atmospheric pressure is January (30.11").
The month with the lowest atmospheric pressure is June (29.79").

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Average wind speed in September
Fort Irwin, CA

Average wind speed in September - Fort Irwin, CA
  • Average wind speed in September: 8mph

The windiest month (with the highest average wind speed) is May (11.7mph).
The calmest month (with the lowest average wind speed) is January (6mph).

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Average humidity in September
Fort Irwin, CA

Average humidity in September - Fort Irwin, CA
  • Average humidity in September: 25%

The month with the highest relative humidity is December (47%).
The month with the lowest relative humidity is August (21%).

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Average rainfall in September
Fort Irwin, CA

Average rainfall in September - Fort Irwin, CA
  • Average rainfall in September: 0.16"

The wettest month (with the highest rainfall) is December (0.51").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
Fort Irwin, CA

Average rainfall days in September - Fort Irwin, CA
  • Average rainfall days in September: 2.8 days

The month with the highest number of rainy days is December (4.6 days).
The month with the least rainy days is June (0.6 days).

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Average snowfall in September
Fort Irwin, CA

Average snowfall in September - Fort Irwin, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.04").
Months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in September
Fort Irwin, CA

Average snowfall days in September - Fort Irwin, CA
  • Average snowfall days in September: 0 days

Months with the highest number of snowfall days are January and December (0.3 days).
Months with the least snowfall days are February, March, April, May, June, July, August, September, October and November (0 days).

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Average daylight in September /
Average sunshine in September
Fort Irwin, CA

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

The month with the longest days is June (Average daylight: 14.5h).
The month with the shortest days is December (Average daylight: 9.8h).

  • Average sunshine in September: 10.6h

Months with the most sunshine are June, July and August (Average sunshine: 12.1h).
The month with the least sunshine is January (Average sunshine: 7.1h).

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Average sunshine days in September
Fort Irwin, CA

Average sunshine days in September - Fort Irwin, CA
  • Average sunshine days in September: 26 days

The month with the most sunshine days is June (29 days).
The month with the least sunshine days is February (23.5 days).

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Average UV index in September
Fort Irwin, CA

Average UV index in September - Fort Irwin, CA
  • Average UV index in September: 6

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are November and December (UV index 3).

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Average cloud cover in September
Fort Irwin, CA

Average cloud cover in September - Fort Irwin, CA
  • Average cloud cover in September: 5

The month with the most cloud cover is December (Cloud cover 18).
The month with the least cloud cover is June (Cloud cover 4).

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Average visibility in September
Fort Irwin, CA

Average visibility in September - Fort Irwin, 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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