September weather forecast and climate
Choteau, MT

Weather in September

The first month of the autumn, September, is also an agreeable month in Choteau, Montana, with average temperature ranging between max 68.2°F (20.1°C) and min 48.6°F (9.2°C).

Temperature

In September, the average high-temperature decreases, from a warm 79°F (26.1°C) in August, to an agreeable 68.2°F (20.1°C). In September, the average low-temperature is 48.6°F (9.2°C).

Humidity

The average relative humidity in Choteau is 48%.

Rainfall

In Choteau, during 6.1 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. Throughout the year, in Choteau, there are 73.3 rainfall days, and 9.17" (233mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, September through December. September is the first month it typically snows in Choteau. Throughout September, in the average 0.7 snowfall days, it receives 0.55" (14mm) of snow. Throughout the year, there are 50.3 snowfall days, and 21.26" (540mm) of snow is accumulated.

Daylight

In September, the average length of the day is 12.5h.

Sunshine

The average sunshine in Choteau is 9.7h.

UV index

The average daily maximum UV index in Choteau is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in September in Choteau?

The average relative humidity in September in Choteau is 48%.

How much does it rain in Choteau in September?

In Choteau, in September, it is raining for 6.1 days, with typically 0.79" (20mm) of accumulated precipitation.

When does it start to snow in Choteau?

September is the first month it typically snows in Choteau, Montana. Throughout September, in the average 0.7 snowfall days, it receives 0.55" (14mm) of snow.

What is the average length of the day in September in Choteau?

The average length of the day in September is 12.5h.

How long on average sun shines in September in Choteau?

In Choteau, Montana, the average sunshine in September is 9.7h.

How high is the UV index in September in Choteau?

The average daily maximum UV index in September in Choteau, Montana, is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from unsafe exposure to the Sun's UV rays.

Average temperature in September
Choteau, MT

Average temperature in September - Choteau, MT
  • Average high temperature in September: 68.2°F

The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is December (28.8°F).

  • Average low temperature in September: 48.6°F

The month with the highest average low temperature is August (55.9°F).
The coldest month (with the lowest average low temperature) is December (16.2°F).

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Average pressure in September
Choteau, MT

Average pressure in September - Choteau, MT
  • Average pressure in September: 29.96"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.88").

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Average wind speed in September
Choteau, MT

Average wind speed in September - Choteau, MT
  • Average wind speed in September: 8.8mph

The windiest month (with the highest average wind speed) is January (11.2mph).
The calmest months (with the lowest average wind speed) are July and August (8mph).

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Average humidity in September
Choteau, MT

Average humidity in September - Choteau, MT
  • Average humidity in September: 48%

The month with the highest relative humidity is January (76%).
The month with the lowest relative humidity is August (42%).

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Average rainfall in September
Choteau, MT

Average rainfall in September - Choteau, MT
  • Average rainfall in September: 0.79"

The wettest month (with the highest rainfall) is June (1.93").
The driest month (with the least rainfall) is December (0.35").

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Average rainfall days in September
Choteau, MT

Average rainfall days in September - Choteau, MT
  • Average rainfall days in September: 6.1 days

The month with the highest number of rainy days is May (11.3 days).
The month with the least rainy days is November (2.7 days).

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Average snowfall in September
Choteau, MT

Average snowfall in September - Choteau, MT
  • Average snowfall in September: 0.55"

The month with the highest snowfall is February (4.17").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Choteau, MT

Average snowfall days in September - Choteau, MT
  • Average snowfall days in September: 0.7 days

The month with the highest number of snowfall days is February (11.3 days).
Months with the least snowfall days are July and August (0 days).

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Average daylight in September /
Average sunshine in September
Choteau, MT

Average daylight in September / Average sunshine in September - Choteau, MT
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 16h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in September: 9.7h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.8h).

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Average sunshine days in September
Choteau, MT

Average sunshine days in September - Choteau, MT
  • Average sunshine days in September: 21 days

The month with the most sunshine days is October (23.2 days).
The month with the least sunshine days is February (15.8 days).

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Average UV index in September
Choteau, MT

Average UV index in September - Choteau, MT
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 6).
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
Choteau, MT

Average cloud cover in September - Choteau, MT
  • Average cloud cover in September: 22

The month with the most cloud cover is February (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 14).

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Average visibility in September
Choteau, MT

Average visibility in September - Choteau, MT
  • 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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