September weather forecastWilsall, MT
September
Weather in September
The first month of the autumn, September, is still a comfortable month in Wilsall, Montana, with an average temperature varying between 64.8°F (18.2°C) and 41.4°F (5.2°C).Temperature
September's arrival coincides with a drop in the average high-temperature, decreasing from August's warm 75°F (23.9°C) to a comfortable 64.8°F (18.2°C). Wilsall's September nights see a large temperature deviation, with temperatures resting at a low of 41.4°F (5.2°C).Humidity
The average relative humidity in September in Wilsall is 55%.Rainfall
In Wilsall, Montana, in September, it is raining for 10.6 days, with typically 1.34" (34mm) of accumulated precipitation. Throughout the year, there are 145.9 rainfall days, and 18.27" (464mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall in Wilsall. September is the first month it typically snows. Throughout September, in the average 1 snowfall days, it receives 1.06" (27mm) of snow. Throughout the year, in Wilsall, Montana, there are 100.5 snowfall days, and 58.7" (1491mm) of snow is accumulated.Daylight
In Wilsall, Montana, the average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 6:44 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:03 pm MDT.
Sunshine
In Wilsall, Montana, the average sunshine in September is 10.1h.UV index
In Wilsall, Montana, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In September, the maximum UV index of 3 suggests these recommendations:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Wilsall, MT
- Average high temperature in September: 64.8°F
The warmest month (with the highest average high temperature) is July (77°F).
The month with the lowest average high temperature is December (25.2°F).
- Average low temperature in September: 41.4°F
The month with the highest average low temperature is August (47.8°F).
The coldest month (with the lowest average low temperature) is February (11.7°F).
Average pressure in September
Wilsall, MT
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Wilsall, MT
- Average wind speed in September: 6mph
The windiest month (with the highest average wind speed) is January (9.2mph).
The calmest month (with the lowest average wind speed) is July (5.2mph).
Average humidity in September
Wilsall, MT
- Average humidity in September: 55%
The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is August (50%).
Average rainfall in September
Wilsall, MT
- Average rainfall in September: 1.34"
The wettest month (with the highest rainfall) is May (2.56").
The driest months (with the least rainfall) are January and December (1.02").
Average rainfall days in September
Wilsall, MT
- Average rainfall days in September: 10.6 days
The month with the highest number of rainy days is May (19.5 days).
The month with the least rainy days is December (6.8 days).
Average snowfall in September
Wilsall, MT
- Average snowfall in September: 1.06"
The month with the highest snowfall is March (9.72").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Wilsall, MT
- Average snowfall days in September: 1 days
The month with the highest number of snowfall days is February (17.9 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Wilsall, MT
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 10h and 6min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).
Average sunshine days in September
Wilsall, MT
- Average sunshine days in September: 16.8 days
The month with the most sunshine days is September (16.8 days).
The month with the least sunshine days is April (7.1 days).
Average UV index in September
Wilsall, 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
Wilsall, MT
- Average cloud cover in September: 21
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Wilsall, MT
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is February (4mi).
