Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Bannack in September undergoes a mild reduction in the average high-temperature, shifting from August's warm 75.4°F (24.1°C) to a comfortable 65.8°F (18.8°C). In Bannack, September nights witness a remarkable decline from the day's zenith to a wintry 42.1°F (5.6°C).Humidity
In Bannack, the average relative humidity in September is 48%.Rainfall
In September, the rain falls for 7.8 days. Throughout September, 0.75" (19mm) of precipitation is accumulated. In Bannack, during the entire year, the rain falls for 103.2 days and collects up to 9.84" (250mm) of precipitation.Snowfall
January through June, September through December are months with snowfall in Bannack, Montana. 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
The average length of the day in September 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 is 9.7h.UV index
In September, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The UV index of 3 during September translates into the following guidance:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September in Bannack?
How many days does it rain in September in Bannack?
When does it start to snow?
How many hours of daylight does Bannack have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September in Bannack?
What is the UV index reading in September?
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).
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).
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).
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%).
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").
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).
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").
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).
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).
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).
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).
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).
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).
Bannack, Montana, USA
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