September weather forecast and climate
Kalispell, MT

A gorgeous sunset over the tranquil city of Kalispell, Montana
A gorgeous sunset over the tranquil city of Kalispell, Montana

Weather in September

September, the first month of the autumn, in Kalispell, is also an enjoyable month, with average temperature ranging between min 39.9°F (4.4°C) and max 65.7°F (18.7°C).

Temperature

In September, the average high-temperature decreases, from a moderately hot 77.4°F (25.2°C) in August, to an enjoyable 65.7°F (18.7°C). In Kalispell, Montana, the average low-temperature is 39.9°F (4.4°C).

Humidity

In September, the average relative humidity is 63%.

Rainfall

In Kalispell, during 8.6 rainfall days, 0.91" (23mm) of precipitation is typically accumulated. In Kalispell, during the entire year, the rain falls for 142.8 days and collects up to 17.36" (441mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, in Kalispell, there are 104.7 snowfall days, and 51.34" (1304mm) of snow is accumulated.

Daylight

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

Sunshine

The average sunshine in September is 9.4h.

UV index

In Kalispell, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to the 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 the skin and eye damage is obliged. 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 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 temperature in September in Kalispell?

The average high-temperature, in September, is 65.7°F (18.7°C), while the average low-temperature is 39.9°F (4.4°C).

What is the average humidity in September in Kalispell?

The average relative humidity in September is 63%.

How much does it rain in Kalispell in September?

In Kalispell, in September, it is raining for 8.6 days, with typically 0.91" (23mm) of accumulated precipitation.

When does it start to snow in Kalispell?

September is the first month it typically snows in Kalispell, Montana. Throughout September, in the average 0.2 snowfall days, it receives 0.04" (1mm) of snow.

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

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

How long on average sun shines in September in Kalispell?

The average sunshine in September in Kalispell, Montana, is 9.4h.

What is the UV index reading in September in Kalispell?

In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in September
Kalispell, MT

Average temperature in September - Kalispell, MT
  • Average high temperature in September: 65.7°F

The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is December (25.9°F).

  • Average low temperature in September: 39.9°F

The month with the highest average low temperature is August (46.4°F).
The coldest month (with the lowest average low temperature) is February (14.4°F).

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Average pressure in September
Kalispell, MT

Average pressure in September - Kalispell, MT
  • Average pressure in September: 29.97"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in September
Kalispell, MT

Average wind speed in September - Kalispell, MT
  • Average wind speed in September: 3.8mph

The windiest month (with the highest average wind speed) is April (4.7mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).

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Average humidity in September
Kalispell, MT

Average humidity in September - Kalispell, MT
  • Average humidity in September: 63%

The month with the highest relative humidity is January (93%).
The month with the lowest relative humidity is August (55%).

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Average rainfall in September
Kalispell, MT

Average rainfall in September - Kalispell, MT
  • Average rainfall in September: 0.91"

The wettest month (with the highest rainfall) is June (2.05").
The driest month (with the least rainfall) is August (0.55").

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Average rainfall days in September
Kalispell, MT

Average rainfall days in September - Kalispell, MT
  • Average rainfall days in September: 8.6 days

The month with the highest number of rainy days is April (17.9 days).
The month with the least rainy days is August (6.6 days).

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Average snowfall in September
Kalispell, MT

Average snowfall in September - Kalispell, MT
  • Average snowfall in September: 0.04"

The month with the highest snowfall is January (11.3").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Kalispell, MT

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

The month with the highest number of snowfall days is December (21.5 days).
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
Kalispell, MT

Average daylight in September / Average sunshine in September - Kalispell, 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: 8.4h).

  • 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: 3.7h).

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Average sunshine days in September
Kalispell, MT

Average sunshine days in September - Kalispell, MT
  • Average sunshine days in September: 19.6 days

The month with the most sunshine days is August (21.8 days).
The month with the least sunshine days is February (6.8 days).

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Average UV index in September
Kalispell, MT

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

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

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Average cloud cover in September
Kalispell, MT

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

The month with the most cloud cover is January (Cloud cover 63).
Months with the least cloud cover are July and August (Cloud cover 15).

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Average visibility in September
Kalispell, MT

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

Months with the highest visibility are May, June, July, August, September and October (6mi).
The month with the lowest visibility is January (3mi).

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