September weather forecast
Fort Shaw, MT

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Weather in September

The first month of the autumn, September, is still a pleasant month in Fort Shaw, Montana, with temperature in the range of an average high of 70.5°F (21.4°C) and an average low of 49.5°F (9.7°C).

Temperature

The arrival of September corresponds with a reduction in the average high-temperature, down from August's warm 81.1°F (27.3°C) to an agreeable 70.5°F (21.4°C). Fort Shaw witnesses an average low-temperature of 49.5°F (9.7°C) throughout the month of September.

Humidity

In Fort Shaw, the average relative humidity in September is 47%.

Rainfall

In Fort Shaw, in September, it is raining for 8.7 days, with typically 1.14" (29mm) of accumulated precipitation. In Fort Shaw, during the entire year, the rain falls for 112.8 days and collects up to 12.95" (329mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall in Fort Shaw. September is the first month it typically snows. Throughout September, in the average 0.7 snowfall days, it receives 2.05" (52mm) of snow. In Fort Shaw, during the entire year, snow falls for 69.4 days and aggregates up to 35.35" (898mm) of snow.

Daylight

In September, the average length of the day in Fort Shaw is 12h and 33min.
On the first day of September in Fort Shaw, sunrise is at 6:47 am and sunset at 8:06 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 7:07 pm MDT.

Sunshine

The average sunshine in September in Fort Shaw is 9.6h.

UV index

The average daily maximum UV index in September in Fort Shaw is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum high daily UV index of 4 during September translates into the following directions:
Heed the precautions - It is counselled to guard against solar damage. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
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Frequently asked questions

What is the average September temperature in Fort Shaw?

The average high-temperature and low-temperature during September are 70.5°F (21.4°C) and 49.5°F (9.7°C) respectively. In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is computed to be 80.6°F (27°C).

What is the average humidity in September in Fort Shaw?

In September, the average relative humidity is 47%.

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

In Fort Shaw, in September, during 8.7 rainfall days, 1.14" (29mm) of precipitation is typically accumulated.

When does it start snowing in Fort Shaw?

September is the first month it typically snows in Fort Shaw, Montana. Throughout September, in the average 0.7 snowfall days, it receives 2.05" (52mm) of snow.

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

In September, the average day length in Fort Shaw is 12h and 33min.

What time are sunrise and sunset in September in Fort Shaw?

On the first day of September in Fort Shaw, Montana, sunrise is at 6:47 am and sunset at 8:06 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 7:07 pm MDT.

How many hours of sunshine does Fort Shaw have in September?

In September, the average sunshine duration in Fort Shaw is 9.6h.

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

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability 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
Fort Shaw, MT

Average temperature in September - Fort Shaw, MT
  • Average high temperature in September: 70.5°F

The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is December (29.5°F).

  • Average low temperature in September: 49.5°F

The month with the highest average low temperature is August (56.7°F).
The coldest month (with the lowest average low temperature) is December (17.4°F).

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Average pressure in September
Fort Shaw, MT

Average pressure in September - Fort Shaw, MT
  • Average pressure in September: 29.96"Hg

The months with the highest atmospheric pressure are January and December (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).

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Average wind speed in September
Fort Shaw, MT

Average wind speed in September - Fort Shaw, MT
  • Average wind speed in September: 8.2mph

The windiest months (with the highest average wind speed) are January and November (10.7mph).
The calmest month (with the lowest average wind speed) is August (7.3mph).

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Average humidity in September
Fort Shaw, MT

Average humidity in September - Fort Shaw, MT
  • Average humidity in September: 47%

The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is August (41%).

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Average rainfall in September
Fort Shaw, MT

Average rainfall in September - Fort Shaw, MT
  • Average rainfall in September: 1.14"

The wettest month (with the highest rainfall) is June (2.05").
The driest months (with the least rainfall) are January and July (0.63").

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Average rainfall days in September
Fort Shaw, MT

Average rainfall days in September - Fort Shaw, MT
  • Average rainfall days in September: 8.7 days

The month with the highest number of rainy days is May (15.2 days).
The month with the least rainy days is January (4.8 days).

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Average snowfall in September
Fort Shaw, MT

Average snowfall in September - Fort Shaw, MT
  • Average snowfall in September: 2.05"

The month with the highest snowfall is February (6.34").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Fort Shaw, MT

Average snowfall days in September - Fort Shaw, MT
  • Average snowfall days in September: 0.7 days

The month with the highest number of snowfall days is February (14.4 days).
The months with the least snowfall days are July and August (0 days).

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Average daylight in September /
Average sunshine in September
Fort Shaw, MT

Average daylight in September / Average sunshine in September - Fort Shaw, MT
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in September: 9h and 4min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).

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Average sunshine days in September
Fort Shaw, MT

Average sunshine days in September - Fort Shaw, MT
  • Average sunshine days in September: 18.8 days

The month with the most sunshine days is September (18.8 days).
The month with the least sunshine days is April (10.3 days).

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Average UV index in September
Fort Shaw, MT

Average UV index in September - Fort Shaw, MT
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).

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Average cloud cover in September
Fort Shaw, MT

Average cloud cover in September - Fort Shaw, MT
  • Average cloud cover in September: 24

The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 14).

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Average visibility in September
Fort Shaw, MT

Average visibility in September - Fort Shaw, MT
  • 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 Shaw, Montana, USA

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