September weather forecast
Bannack, MT

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Weather in September

September, the first month of the autumn in Bannack, is still a refreshing month, with an average temperature varying between 42.1°F (5.6°C) and 65.8°F (18.8°C).

Temperature

With September's onset, the average high-temperature recedes from August's warm 75.4°F (24.1°C) to a refreshing 65.8°F (18.8°C). Bannack registers a prominent dip from daytime highs, with an average of 42.1°F (5.6°C) during the nights of September.

Humidity

In Bannack, Montana, the average relative humidity in September is 48%.

Rainfall

In Bannack, in September, during 7.8 rainfall days, 0.75" (19mm) of precipitation is typically accumulated. Throughout the year, there are 103.2 rainfall days, and 9.84" (250mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 0.9 snowfall days, it receives 1.22" (31mm) of snow. In Bannack, during the entire year, snow falls for 81.9 days and aggregates up to 31.65" (804mm) of snow.

Daylight

In September, the average length of the day is 12h and 31min.
On the first day of September, sunrise is at 6:54 am and sunset at 8:08 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 7:13 pm MDT.

Sunshine

In September, the average sunshine in Bannack is 9.7h.

UV index

The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: During September, 3 as the daily maximum UV index converts into the following advice:
Ensure safety - Recommendations to avert sunburn are presented. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
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Frequently asked questions

What are September temperatures in Bannack?

Bannack in September has an average high-temperature of 65.8°F (18.8°C) and an average low-temperature of 42.1°F (5.6°C).

What is the average humidity in September in Bannack?

In September, the average relative humidity in Bannack is 48%.

How much does it rain in Bannack in September?

In September, in Bannack, the rain falls for 7.8 days. Throughout September, 0.75" (19mm) of precipitation is accumulated.

When does it start to snow in Bannack?

September is the first month it typically snows. Throughout September, in the average 0.9 snowfall days, it receives 1.22" (31mm) of snow.

How many hours of daylight does Bannack have in September?

In September, the average day length in Bannack is 12h and 31min.

What time are sunrise and sunset in September in Bannack?

In September, on the first day of the month, sunrise is at 6:54 am and sunset at 8:08 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 7:13 pm MDT.

How many hours of sunshine does Bannack have in September?

The average sunshine duration in September is 9.7h.

What is the UV index reading in September in Bannack?

The average daily maximum UV index in September in Bannack, Montana, is 3. A UV Index of 3 to 5 symbolizes a medium health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Bannack, MT

Average temperature in September - Bannack, MT
  • Average high temperature in September: 65.8°F

The warmest month (with the highest average high temperature) is July (76.6°F).
The month with the lowest average high temperature is December (24.3°F).

  • Average low temperature in September: 42.1°F

The month with the highest average low temperature is July (47.1°F).
The coldest month (with the lowest average low temperature) is December (9.9°F).

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Average pressure in September
Bannack, MT

Average pressure in September - Bannack, MT
  • Average pressure in September: 29.99"Hg

The month with the highest atmospheric pressure is January (30.25"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in September
Bannack, MT

Average wind speed in September - Bannack, MT
  • Average wind speed in September: 5.8mph

The windiest months (with the highest average wind speed) are November and December (7.3mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

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Average humidity in September
Bannack, MT

Average humidity in September - Bannack, MT
  • Average humidity in September: 48%

The months with the highest relative humidity are January and February (86%).
The months with the lowest relative humidity are July and August (43%).

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Average rainfall in September
Bannack, MT

Average rainfall in September - Bannack, MT
  • Average rainfall in September: 0.75"

The wettest month (with the highest rainfall) is June (1.73").
The driest month (with the least rainfall) is January (0.43").

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Average rainfall days in September
Bannack, MT

Average rainfall days in September - Bannack, MT
  • Average rainfall days in September: 7.8 days

The month with the highest number of rainy days is May (13.7 days).
The month with the least rainy days is January (4.6 days).

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Average snowfall in September
Bannack, MT

Average snowfall in September - Bannack, MT
  • Average snowfall in September: 1.22"

The month with the highest snowfall is April (4.96").
The months with the least snowfall are July and August (0").

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Average snowfall days in September
Bannack, MT

Average snowfall days in September - Bannack, MT
  • Average snowfall days in September: 0.9 days

The month with the highest number of snowfall days is February (13.3 days).
The months with the least snowfall days are July and August (0 days).

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

Average daylight in September / Average sunshine in September - Bannack, MT
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in September: 9h and 4min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 54min).

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Average sunshine days in September
Bannack, MT

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

The month with the most sunshine days is July (20.7 days).
The month with the least sunshine days is April (10.7 days).

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Average UV index in September
Bannack, MT

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

The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is February (UV index 1).

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Average cloud cover in September
Bannack, MT

Average cloud cover in September - Bannack, MT
  • Average cloud cover in September: 19

The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 13).

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Average visibility in September
Bannack, MT

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

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

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Bannack, Montana, USA

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