September weather forecastCascade, MT
September
Weather in September
September, the first month of the autumn in Cascade, is still a pleasant month, with an average temperature varying between 49.5°F (9.7°C) and 70.5°F (21.4°C).Temperature
Cascade's September weather features a mild decline in high-temperatures, reducing from a moderately hot 81.1°F (27.3°C) in August to an agreeable 70.5°F (21.4°C). Nighttime temperature lowers to an average of 49.5°F (9.7°C) in September.Humidity
In September, the average relative humidity is 47%.Rainfall
In Cascade, in September, it is raining for 8.7 days, with typically 1.14" (29mm) of accumulated precipitation. Throughout the year, there are 112.8 rainfall days, and 12.95" (329mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.7 snowfall days, it receives 2.05" (52mm) of snow. In Cascade, during the entire year, snow falls for 69.4 days and aggregates up to 35.35" (898mm) of snow.Daylight
The average length of the day in September is 12h and 32min.On the first day of September, sunrise is at 6:46 am and sunset at 8:06 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 7:07 pm MDT.
Sunshine
The average sunshine in September is 9.6h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: In September, the maximum UV index of 4 transforms into these recommendations:
Guard yourself - Precautionary measures against sun damage are advocated. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Stay sun-safe with clothing that is both closely woven and worn loosely. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Cascade, MT
- Average high temperature in September: 70.5°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is December (29.5°F).
- Average low temperature in September: 49.5°F
The month with the highest average low temperature is August (56.7°F).
The coldest month (with the lowest average low temperature) is December (17.4°F).
Average pressure in September
Cascade, MT
- Average pressure in September: 29.96"Hg
The months with the highest atmospheric pressure are January and December (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Cascade, MT
- Average wind speed in September: 8.2mph
The windiest months (with the highest average wind speed) are January and November (10.7mph).
The calmest month (with the lowest average wind speed) is August (7.3mph).
Average humidity in September
Cascade, MT
- Average humidity in September: 47%
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is August (41%).
Average rainfall in September
Cascade, MT
- Average rainfall in September: 1.14"
The wettest month (with the highest rainfall) is June (2.05").
The driest months (with the least rainfall) are January and July (0.63").
Average rainfall days in September
Cascade, MT
- Average rainfall days in September: 8.7 days
The month with the highest number of rainy days is May (15.2 days).
The month with the least rainy days is January (4.8 days).
Average snowfall in September
Cascade, MT
- Average snowfall in September: 2.05"
The month with the highest snowfall is February (6.34").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Cascade, MT
- Average snowfall days in September: 0.7 days
The month with the highest number of snowfall days is February (14.4 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Cascade, MT
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 9h and 36min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).
Average sunshine days in September
Cascade, MT
- Average sunshine days in September: 18.8 days
The month with the most sunshine days is September (18.8 days).
The month with the least sunshine days is April (10.3 days).
Average UV index in September
Cascade, MT
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in September
Cascade, MT
- Average cloud cover in September: 24
The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 14).
Average visibility in September
Cascade, 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).
