September weather forecast
Polson, MT

Weather in September

September, the first month of the autumn in Polson, is still a comfortable month, with temperature in the range of an average high of 67.6°F (19.8°C) and an average low of 42.3°F (5.7°C).

Temperature

In September, the average high-temperature drops from a warm 78.6°F (25.9°C) in August to a comfortable 67.6°F (19.8°C). In September, in Polson, the average low-temperature is 42.3°F (5.7°C).

Humidity

In Polson, the average relative humidity in September is 59%.

Rainfall

In Polson, it is raining for 10.7 days, with typically 0.94" (24mm) of accumulated precipitation. In Polson, during the entire year, the rain falls for 160.2 days and collects up to 18.11" (460mm) of precipitation.

Snowfall

Months with snowfall in Polson are January through May, September through December. September is the first month it typically snows in Polson, Montana. Throughout September, in the average 0.2 snowfall days, it receives 0.31" (8mm) of snow. In Polson, Montana, during the entire year, snow falls for 99 days and aggregates up to 47.28" (1201mm) of snow.

Daylight

The average length of the day in September in Polson is 12h and 33min.
On the first day of the month, sunrise is at 6:55 am and sunset at 8:17 pm. On the last day of September, in Polson, sunrise is at 7:34 am and sunset at 7:18 pm MDT.

Sunshine

The average sunshine in September is 9.4h.

UV index

In Polson, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 3 translate into the following recommendations:
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. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in September in Polson?

The average relative humidity in September in Polson, Montana, is 59%.

How many days does it rain in September in Polson?

In September, in Polson, the rain falls for 10.7 days. Throughout September, 0.94" (24mm) of precipitation is accumulated.

When does it start to snow in Polson?

September is the first month it typically snows in Polson. Throughout September, in the average 0.2 snowfall days, it receives 0.31" (8mm) of snow.

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

In Polson, Montana, the average day length in September is 12h and 33min.

What time are sunrise and sunset in September in Polson?

On the first day of September, sunrise is at 6:55 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 7:18 pm MDT.

How long on average sun shines in September in Polson?

In September, the average sunshine duration in Polson is 9.4h.

What is the UV index intensity in September in Polson?

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

Average temperature in September
Polson, MT

Average temperature in September - Polson, MT
  • Average high temperature in September: 67.6°F

The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is December (27.9°F).

  • Average low temperature in September: 42.3°F

The months with the highest average low temperature are July and August (48.9°F).
The coldest month (with the lowest average low temperature) is December (16.7°F).

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Average pressure in September
Polson, MT

Average pressure in September - Polson, MT
  • Average pressure in September: 29.98"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in September
Polson, MT

Average wind speed in September - Polson, MT
  • Average wind speed in September: 3.9mph

The windiest month (with the highest average wind speed) is April (4.8mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).

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Average humidity in September
Polson, MT

Average humidity in September - Polson, MT
  • Average humidity in September: 59%

The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is August (51%).

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Average rainfall in September
Polson, MT

Average rainfall in September - Polson, MT
  • Average rainfall in September: 0.94"

The wettest month (with the highest rainfall) is June (2.2").
The driest months (with the least rainfall) are July and August (0.55").

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Average rainfall days in September
Polson, MT

Average rainfall days in September - Polson, MT
  • Average rainfall days in September: 10.7 days

The months with the highest number of rainy days are March and April (18.8 days).
The month with the least rainy days is August (7 days).

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Average snowfall in September
Polson, MT

Average snowfall in September - Polson, MT
  • Average snowfall in September: 0.31"

The month with the highest snowfall is February (10.28").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Polson, MT

Average snowfall days in September - Polson, MT
  • Average snowfall days in September: 0.2 days

The month with the highest number of snowfall days is December (19.8 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in September / Average sunshine in September - Polson, MT
  • Average daylight in September: 12h and 33min

The month with the longest days is June (Average daylight: 15h and 56min).
The month with the shortest days is December (Average daylight: 8h and 29min).

  • Average sunshine in September: 9.4h

The month with the most sunshine is July (Average sunshine: 11.9h).
The month with the least sunshine is January (Average sunshine: 4.5h).

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Average sunshine days in September
Polson, MT

Average sunshine days in September - Polson, MT
  • Average sunshine days in September: 17.5 days

The month with the most sunshine days is July (21.3 days).
The month with the least sunshine days is March (6.4 days).

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Average UV index in September
Polson, MT

Average UV index in September - Polson, MT
  • Average UV index in September: 3

The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).

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Average cloud cover in September
Polson, MT

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

The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July and August (Cloud cover 14).

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Average visibility in September
Polson, MT

Average visibility in September - Polson, MT
  • Average visibility in September: 6mi

The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).

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