September weather forecastJoliet, MT
September
Weather in September
September, the first month of the autumn in Joliet, is still a pleasant month, with an average temperature varying between 50.2°F (10.1°C) and 72°F (22.2°C).Temperature
The start of September comes with a reduction in the average high-temperature, receding from a moderately hot 81.1°F (27.3°C) in August to a pleasant 72°F (22.2°C). Joliet anticipates a considerable daily temperature fluctuation in September, with low temperatures averaging a fresh 50.2°F (10.1°C).Humidity
In September, the average relative humidity in Joliet is 45%.Rainfall
In Joliet, in September, during 6.9 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. Throughout the year, there are 108.1 rainfall days, and 12.83" (326mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.8 snowfall days, it receives 0.67" (17mm) of snow. In Joliet, during the entire year, snow falls for 61.5 days and aggregates up to 41.77" (1061mm) of snow.Daylight
In September, the average length of the day is 12h and 31min.On the first day of the month, sunrise is at 6:38 am and sunset at 7:52 pm. On the last day of September, sunrise is at 7:13 am and sunset at 6:57 pm MDT.
Sunshine
The average sunshine in September is 10.6h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: In September, the maximum UV index of 4 translates into these guidelines:
Undertake protective steps - Recommendations to avoid sunburn are issued. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Joliet, MT
- Average high temperature in September: 72°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is December (30.7°F).
- Average low temperature in September: 50.2°F
The months with the highest average low temperature are July and August (57.2°F).
The coldest month (with the lowest average low temperature) is February (16.7°F).
Average pressure in September
Joliet, MT
- Average pressure in September: 29.96"Hg
The months with the highest atmospheric pressure are January and December (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Joliet, MT
- Average wind speed in September: 6.9mph
The windiest month (with the highest average wind speed) is January (8.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in September
Joliet, MT
- Average humidity in September: 45%
The month with the highest relative humidity is January (76%).
The month with the lowest relative humidity is August (41%).
Average rainfall in September
Joliet, MT
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is May (2.09").
The driest month (with the least rainfall) is January (0.51").
Average rainfall days in September
Joliet, MT
- Average rainfall days in September: 6.9 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (4 days).
Average snowfall in September
Joliet, MT
- Average snowfall in September: 0.67"
The month with the highest snowfall is February (6.81").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Joliet, MT
- Average snowfall days in September: 0.8 days
The month with the highest number of snowfall days is February (10.8 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Joliet, MT
- Average daylight in September: 12h and 30min
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: 10h and 36min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 12min).
Average sunshine days in September
Joliet, MT
- Average sunshine days in September: 18.4 days
The month with the most sunshine days is December (19.7 days).
The month with the least sunshine days is May (10.5 days).
Average UV index in September
Joliet, 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, November and December (UV index 2).
Average cloud cover in September
Joliet, MT
- Average cloud cover in September: 18
The month with the most cloud cover is February (Cloud cover 38).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in September
Joliet, 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).
