September weather forecast and climate
Colstrip, MT

Weather in September

The first month of the autumn, September, is also a moderately hot month in Colstrip, Montana, with temperature in the range of an average low of 53.2°F (11.8°C) and an average high of 73.8°F (23.2°C).

Temperature

In September, the average high-temperature decreases, from 83.3°F (28.5°C) in August, to a still warm 73.8°F (23.2°C). In September, in Colstrip, the average low-temperature is 53.2°F (11.8°C).

Humidity

The average relative humidity in Colstrip is 45%.

Rainfall

In Colstrip, in September, it is raining for 10.3 days, with typically 1.38" (35mm) of accumulated precipitation. Throughout the year, there are 113.9 rainfall days, and 14.84" (377mm) of precipitation is accumulated.

Snowfall

January through June, September through December are months with snowfall in Colstrip. September is the first month it typically snows in Colstrip, Montana. Throughout September, in the average 0.2 snowfall days, it receives 0.16" (4mm) of snow. In Colstrip, during the entire year, snow falls for 55.2 days, and aggregates up to 23.5" (597mm) of snow.

Daylight

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

Sunshine

In September, the average sunshine is 10.4h.

UV index

The average daily maximum UV index in Colstrip is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to the UV radiation for average individuals.
Note: The average daily UV index of 4 transform into the following instructions:
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. 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 Colstrip?

In Colstrip, the average relative humidity in September is 45%.

How much does it rain in Colstrip in September?

In Colstrip, during September, the rain falls for 10.3 days and regularly aggregates up to 1.38" (35mm) of precipitation.

When does it start snowing in Colstrip?

September is the first month it typically snows in Colstrip. Throughout September, in the average 0.2 snowfall days, it receives 0.16" (4mm) of snow.

How many hours of daylight does Colstrip have in September?

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

How many hours of sunshine does Colstrip have in September?

The average sunshine in September in Colstrip is 10.4h.

What is the UV index reading in September in Colstrip?

The average daily maximum UV index in September in Colstrip, Montana, is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from unprotected exposure to the UV radiation.

Average temperature in September
Colstrip, MT

Average temperature in September - Colstrip, MT
  • Average high temperature in September: 73.8°F

The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is December (30.4°F).

  • Average low temperature in September: 53.2°F

The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (16°F).

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Average pressure in September
Colstrip, MT

Average pressure in September - Colstrip, MT
  • Average pressure in September: 29.92"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is June (29.84").

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Average wind speed in September
Colstrip, MT

Average wind speed in September - Colstrip, MT
  • Average wind speed in September: 8.4mph

The windiest month (with the highest average wind speed) is April (10mph).
The calmest months (with the lowest average wind speed) are July and August (7.8mph).

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Average humidity in September
Colstrip, MT

Average humidity in September - Colstrip, MT
  • Average humidity in September: 45%

The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is August (42%).

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Average rainfall in September
Colstrip, MT

Average rainfall in September - Colstrip, MT
  • Average rainfall in September: 1.38"

The wettest month (with the highest rainfall) is May (2.56").
The driest month (with the least rainfall) is December (0.47").

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Average rainfall days in September
Colstrip, MT

Average rainfall days in September - Colstrip, MT
  • Average rainfall days in September: 10.3 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is February (2.8 days).

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Average snowfall in September
Colstrip, MT

Average snowfall in September - Colstrip, MT
  • Average snowfall in September: 0.16"

The month with the highest snowfall is February (4.33").
Months with the least snowfall are July and August (0").

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Average snowfall days in September
Colstrip, MT

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

The month with the highest number of snowfall days is February (10.4 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
Colstrip, MT

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

The month with the longest days is June (Average daylight: 15.7h).
The month with the shortest days is December (Average daylight: 8.7h).

  • Average sunshine in September: 10.4h

The month with the most sunshine is July (Average sunshine: 11.8h).
The month with the least sunshine is February (Average sunshine: 5h).

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Average sunshine days in September
Colstrip, MT

Average sunshine days in September - Colstrip, MT
  • Average sunshine days in September: 16.8 days

The month with the most sunshine days is December (20.5 days).
The month with the least sunshine days is May (11.3 days).

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Average UV index in September
Colstrip, MT

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

The month with the highest UV index is July (UV index 7).
Months with the lowest UV index are January, February, March, April, November and December (UV index 2).

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Average cloud cover in September
Colstrip, MT

Average cloud cover in September - Colstrip, MT
  • Average cloud cover in September: 21

The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 15).

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Average visibility in September
Colstrip, MT

Average visibility in September - Colstrip, 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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