September weather forecast and climate
Alberton, MT

Weather in September

September, the first month of the autumn, in Alberton, is also an enjoyable month, with average temperature varying between 41°F (5°C) and 67.8°F (19.9°C).

Temperature

In Alberton, Montana, the average high-temperature decreases, from a warm 78.4°F (25.8°C) in August, to an enjoyable 67.8°F (19.9°C). In September, in Alberton, the average low-temperature is 41°F (5°C).

Humidity

The average relative humidity in Alberton is 58%.

Rainfall

In Alberton, in September, it is raining for 9.5 days, with typically 0.98" (25mm) of accumulated precipitation. Throughout the year, there are 141.4 rainfall days, and 16.5" (419mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall in Alberton. September is the first month it typically snows. Throughout September, in the average 0.4 snowfall days, it receives 0.59" (15mm) of snow. Throughout the year, there are 81.4 snowfall days, and 42.91" (1090mm) of snow is accumulated.

Daylight

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

Sunshine

In Alberton, the average sunshine is 9.4h.

UV index

The average daily maximum UV index in Alberton is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV rays for the average person.
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 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 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 Alberton?

In September, the average relative humidity is 58%.

How much does it rain in Alberton in September?

In Alberton, Montana, in September, it is raining for 9.5 days, with typically 0.98" (25mm) of accumulated precipitation.

When does it start to snow in Alberton?

September is the first month it typically snows. Throughout September, in the average 0.4 snowfall days, it receives 0.59" (15mm) of snow.

How many hours of daylight does Alberton have in September?

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

How many hours of sunshine does Alberton have in September?

The average sunshine in September in Alberton is 9.4h.

What is the UV index reading in September in Alberton?

In Alberton, Montana, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV radiation.

Average temperature in September
Alberton, MT

Average temperature in September - Alberton, MT
  • Average high temperature in September: 67.8°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: 41°F

The month with the highest average low temperature is August (48°F).
The coldest month (with the lowest average low temperature) is December (15.8°F).

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Average pressure in September
Alberton, MT

Average pressure in September - Alberton, MT
  • Average pressure in September: 29.98"

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

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Average wind speed in September
Alberton, MT

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

The windiest month (with the highest average wind speed) is April (4.9mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).

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Average humidity in September
Alberton, MT

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

The month with the highest relative humidity is January (90%).
Months with the lowest relative humidity are July and August (51%).

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Average rainfall in September
Alberton, MT

Average rainfall in September - Alberton, MT
  • Average rainfall in September: 0.98"

The wettest month (with the highest rainfall) is April (1.97").
The driest month (with the least rainfall) is July (0.47").

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Average rainfall days in September
Alberton, MT

Average rainfall days in September - Alberton, MT
  • Average rainfall days in September: 9.5 days

The month with the highest number of rainy days is April (16.7 days).
Months with the least rainy days are July and August (6.7 days).

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Average snowfall in September
Alberton, MT

Average snowfall in September - Alberton, MT
  • Average snowfall in September: 0.59"

The month with the highest snowfall is February (10.75").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Alberton, MT

Average snowfall days in September - Alberton, MT
  • Average snowfall days in September: 0.4 days

The month with the highest number of snowfall days is February (16.2 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
Alberton, MT

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

The month with the longest days is June (Average daylight: 15.8h).
The month with the shortest days is December (Average daylight: 8.6h).

  • Average sunshine in September: 9.4h

The month with the most sunshine is July (Average sunshine: 11.8h).
The month with the least sunshine is January (Average sunshine: 4.8h).

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Average sunshine days in September
Alberton, MT

Average sunshine days in September - Alberton, MT
  • Average sunshine days in September: 18.4 days

The month with the most sunshine days is July (22.5 days).
Months with the least sunshine days are February and April (9.2 days).

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Average UV index in September
Alberton, MT

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

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

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Average cloud cover in September
Alberton, MT

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

The month with the most cloud cover is February (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 14).

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Average visibility in September
Alberton, MT

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

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

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