September weather forecastWillow Creek, MT
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Willow Creek, Montana, with temperature in the range of an average low of 44.4°F (6.9°C) and an average high of 70.9°F (21.6°C).Temperature
Willow Creek's weather changes with the onset of September, slightly falling from a warm 81.9°F (27.7°C) in August to a pleasant 70.9°F (21.6°C). A noteworthy thermal contrast characterizes Willow Creek's September nights, with temperatures averaging at a chilly 44.4°F (6.9°C).Humidity
The average relative humidity in September is 49%.Rainfall
In Willow Creek, in September, it is raining for 8.4 days, with typically 0.91" (23mm) of accumulated precipitation. Throughout the year, there are 134.2 rainfall days, and 11.34" (288mm) 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 0.5 snowfall days, it receives 0.83" (21mm) of snow. Throughout the year, there are 79.6 snowfall days, and 30.08" (764mm) of snow is accumulated.Daylight
In Willow Creek, the average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:48 am and sunset at 8:04 pm. On the last day of September, sunrise is at 7:24 am and sunset at 7:07 pm MDT.
Sunshine
In September, the average sunshine is 10h.UV index
In Willow Creek, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: A maximum daily UV index of 3 during September morphs into the following directions:
Undertake protective steps - Recommendations to avoid sunburn are issued. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Stay sun-safe with clothing that is both closely woven and worn loosely. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Willow Creek, MT
- Average high temperature in September: 70.9°F
The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is December (28°F).
- Average low temperature in September: 44.4°F
The month with the highest average low temperature is August (50.5°F).
The coldest month (with the lowest average low temperature) is December (12.7°F).
Average pressure in September
Willow Creek, MT
- Average pressure in September: 29.98"Hg
The months with the highest atmospheric pressure are January and December (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Willow Creek, MT
- Average wind speed in September: 4.6mph
The windiest month (with the highest average wind speed) is April (5.5mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).
Average humidity in September
Willow Creek, MT
- Average humidity in September: 49%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (44%).
Average rainfall in September
Willow Creek, MT
- Average rainfall in September: 0.91"
The wettest month (with the highest rainfall) is June (1.57").
The driest month (with the least rainfall) is August (0.51").
Average rainfall days in September
Willow Creek, MT
- Average rainfall days in September: 8.4 days
The month with the highest number of rainy days is April (16.5 days).
The month with the least rainy days is August (7.6 days).
Average snowfall in September
Willow Creek, MT
- Average snowfall in September: 0.83"
The month with the highest snowfall is February (6.02").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Willow Creek, MT
- Average snowfall days in September: 0.5 days
The month with the highest number of snowfall days is February (16.5 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Willow Creek, 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 0min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 5h and 54min).
Average sunshine days in September
Willow Creek, MT
- Average sunshine days in September: 18.7 days
The month with the most sunshine days is September (18.7 days).
The month with the least sunshine days is April (9.3 days).
Average UV index in September
Willow Creek, MT
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Willow Creek, MT
- Average cloud cover in September: 20
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in September
Willow Creek, MT
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
