September weather forecast
Fort Irwin, CA

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Weather in September

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

Temperature

A subtle shift in Fort Irwin's weather is observed as August turns into September, with the average high temperature reducing from a very hot 97.3°F (36.3°C) to a tropical 89.8°F (32.1°C). September witnesses an average low-temperature hovering around an agreeable 69.1°F (20.6°C).

Humidity

The average relative humidity in September 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

In Fort Irwin, the average length of the day in September is 12h and 23min.
On the first day of the month, sunrise is at 6:19 am and sunset at 7:13 pm. On the last day of September, in Fort Irwin, sunrise is at 6:41 am and sunset at 6:31 pm PDT.

Sunshine

In September, the average sunshine is 10.6h.

UV index

The average daily maximum UV index in September in Fort Irwin is 6. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: In September, a daily UV index of 6 turns into the following recommendations:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
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Frequently asked questions

How hot does it get in Fort Irwin in September?

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

How much does it rain in Fort Irwin in September?

In Fort Irwin, California, during September, the rain falls for 2.8 days and regularly aggregates up to 0.16" (4mm) of precipitation.

When it does not snow in Fort Irwin?

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

What is the average length of the day in September in Fort Irwin?

The average day length in September is 12h and 23min.

When are sunrise and sunset in September in Fort Irwin?

In September, on the first day of the month, sunrise is at 6:19 am and sunset at 7:13 pm. On the last day of the month, sunrise is at 6:41 am and sunset at 6:31 pm PDT.

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

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

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

In Fort Irwin, 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 unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

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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").
The 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

The months with the highest number of snowfall days are January and December (0.3 days).
The 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: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in September: 10h and 4min

The months with the most sunshine are June, July and August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 7h and 6min).

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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

The months with the highest UV index are June and July (UV index 8).
The 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

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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Fort Irwin, California, USA

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