September weather forecastMusselshell, MT
September
Weather in September
The first month of the autumn, September, is also an agreeable month in Musselshell, Montana, with an average temperature ranging between max 72.7°F (22.6°C) and min 53.2°F (11.8°C).Temperature
The onset of September introduces a moderate change in Musselshell's weather, with average high-temperatures falling from August's warm 82.8°F (28.2°C) to a pleasant 72.7°F (22.6°C). During the month of September, the nighttime temperature in Musselshell falls to an average of 53.2°F (11.8°C).Humidity
In September, the average relative humidity in Musselshell is 44%.Rainfall
In Musselshell, during September, the rain falls for 8 days and regularly aggregates up to 0.94" (24mm) of precipitation. In Musselshell, during the entire year, the rain falls for 114.3 days and collects up to 12.13" (308mm) of precipitation.Snowfall
January through May, September through December are months with snowfall in Musselshell. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.12" (3mm) of snow. Throughout the year, there are 53.5 snowfall days, and 18.58" (472mm) of snow is accumulated.Daylight
The average length of the day in September is 12h and 32min.On the first day of the month, sunrise is at 6:33 am and sunset at 7:50 pm. On the last day of September, in Musselshell, sunrise is at 7:10 am and sunset at 6:53 pm MDT.
Sunshine
In Musselshell, the average sunshine in September is 10.2h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 4 in September translates into these instructions:
Undertake precautions - Guarding against sun damage is counselled. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Musselshell, MT
- Average high temperature in September: 72.7°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (31.1°F).
- Average low temperature in September: 53.2°F
The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is February (18°F).
Average pressure in September
Musselshell, MT
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Musselshell, MT
- Average wind speed in September: 9.3mph
The windiest month (with the highest average wind speed) is January (11.2mph).
The calmest months (with the lowest average wind speed) are July and August (8.5mph).
Average humidity in September
Musselshell, MT
- Average humidity in September: 44%
The month with the highest relative humidity is January (77%).
The month with the lowest relative humidity is August (39%).
Average rainfall in September
Musselshell, MT
- Average rainfall in September: 0.94"
The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in September
Musselshell, MT
- Average rainfall days in September: 8 days
The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is February (4.6 days).
Average snowfall in September
Musselshell, MT
- Average snowfall in September: 0.12"
The month with the highest snowfall is February (3.78").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Musselshell, MT
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is February (11.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Musselshell, MT
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 10h and 12min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are February and December (Average sunshine: 5h and 12min).
Average sunshine days in September
Musselshell, MT
- Average sunshine days in September: 19.5 days
The month with the most sunshine days is September (19.5 days).
The month with the least sunshine days is April (12.8 days).
Average UV index in September
Musselshell, MT
- Average UV index in September: 4
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Musselshell, MT
- Average cloud cover in September: 22
The month with the most cloud cover is February (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 16).
Average visibility in September
Musselshell, MT
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
