September weather forecast
Missoula, MT

The scenic area surrounding the iconic Higgins Street Bridge in Missoula, Montana
The scenic area surrounding the iconic Higgins Street Bridge in Missoula, Montana

Weather in September

September, the first month of the autumn in Missoula, is still a pleasant month, with an average temperature ranging between min 41°F (5°C) and max 68.7°F (20.4°C).

Temperature

In September, the average high-temperature decreases from a moderately hot 79.7°F (26.5°C) in August to a pleasant 68.7°F (20.4°C). In Missoula, in September, the average low-temperature is 41°F (5°C).

Humidity

The average relative humidity in September is 58%.

Rainfall

In Missoula, Montana, it is raining for 4.2 days, with typically 0.24" (6mm) of accumulated precipitation. In Missoula, Montana, during the entire year, the rain falls for 67.5 days and collects up to 3.27" (83mm) of precipitation.

Snowfall

Months with snowfall in Missoula are January through May, September through December. September is the first month it typically snows in Missoula. Throughout September, in the average 0.1 snowfall days, it receives 0.2" (5mm) of snow. In Missoula, during the entire year, snow falls for 44 days and aggregates up to 8.07" (205mm) of snow.

Daylight

In Missoula, the average length of the day in September is 12h and 32min.
On the first day of the month, sunrise is at 6:56 am and sunset at 8:15 pm. On the last day of September, sunrise is at 7:33 am and sunset at 7:17 pm MDT.

Sunshine

In Missoula, the average sunshine in September is 9.4h.

UV index

In Missoula, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.
Note: In September, the average maximum UV index of 3 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. 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 Missoula?

The average relative humidity in September in Missoula, Montana, is 58%.

How many days does it rain in September in Missoula?

In Missoula, in September, it is raining for 4.2 days, with typically 0.24" (6mm) of accumulated precipitation.

When does it start to snow in Missoula?

September is the first month it typically snows in Missoula, Montana. Throughout September, in the average 0.1 snowfall days, it receives 0.2" (5mm) of snow.

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

In September, the average day length in Missoula is 12h and 32min.

What time are sunrise and sunset in September in Missoula?

On the first day of September in Missoula, sunrise is at 6:56 am and sunset at 8:15 pm. On the last day of the month, sunrise is at 7:33 am and sunset at 7:17 pm MDT.

How many hours of sunshine does Missoula have in September?

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

What is the UV index reading in September in Missoula?

In September, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Missoula, MT

Average temperature in September - Missoula, MT
  • Average high temperature in September: 68.7°F

The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is December (28°F).

  • Average low temperature in September: 41°F

The month with the highest average low temperature is August (46.9°F).
The coldest month (with the lowest average low temperature) is December (15.4°F).

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Average pressure in September
Missoula, MT

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

The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Missoula, MT

Average wind speed in September - Missoula, MT
  • Average wind speed in September: 4.2mph

The windiest month (with the highest average wind speed) is April (5mph).
The calmest month (with the lowest average wind speed) is August (4mph).

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Average humidity in September
Missoula, MT

Average humidity in September - Missoula, MT
  • Average humidity in September: 58%

The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is July (50%).

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Average rainfall in September
Missoula, MT

Average rainfall in September - Missoula, MT
  • Average rainfall in September: 0.24"

The wettest month (with the highest rainfall) is April (0.47").
The driest months (with the least rainfall) are July and December (0.16").

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Average rainfall days in September
Missoula, MT

Average rainfall days in September - Missoula, MT
  • Average rainfall days in September: 4.2 days

The month with the highest number of rainy days is April (8.8 days).
The month with the least rainy days is August (3.3 days).

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Average snowfall in September
Missoula, MT

Average snowfall in September - Missoula, MT
  • Average snowfall in September: 0.2"

The month with the highest snowfall is February (2.36").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Missoula, MT

Average snowfall days in September - Missoula, MT
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is December (9 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
Missoula, MT

Average daylight in September / Average sunshine in September - Missoula, MT
  • Average daylight in September: 12h and 32min

The month with the longest days is June (Average daylight: 15h and 49min).
The month with the shortest days is December (Average daylight: 8h and 36min).

  • Average sunshine in September: 9h and 24min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).

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Average sunshine days in September
Missoula, MT

Average sunshine days in September - Missoula, MT
  • Average sunshine days in September: 24.5 days

The month with the most sunshine days is July (27 days).
The month with the least sunshine days is April (17.8 days).

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Average UV index in September
Missoula, MT

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

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are February and December (UV index 1).

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Average cloud cover in September
Missoula, MT

Average cloud cover in September - Missoula, MT
  • Average cloud cover in September: 23

The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is July (Cloud cover 14).

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Average visibility in September
Missoula, MT

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

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

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