Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Fort Smith's transition into September involves a shift in temperature, receding from a moderately hot 81.3°F (27.4°C) in August to a pleasant 71.4°F (21.9°C). In September, the temperature in Fort Smith, Montana, drops to an average of 51.3°F (10.7°C) at night.Humidity
The average relative humidity in September in Fort Smith is 44%.Rainfall
In September, in Fort Smith, the rain falls for 9.9 days. Throughout September, 0.83" (21mm) of precipitation is accumulated. Throughout the year, in Fort Smith, there are 128.8 rainfall days, and 12.64" (321mm) 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 0.2 snowfall days, it receives 0.04" (1mm) of snow. In Fort Smith, during the entire year, snow falls for 66 days and aggregates up to 33.07" (840mm) of snow.Daylight
The average length of the day in September in Fort Smith is 12h and 31min.On the first day of September, sunrise is at 6:34 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:53 pm MDT.
Sunshine
In September, the average sunshine is 10.6h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Undertake protective steps - Recommendations to avoid sunburn are issued. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Fort Smith in September?
What is the average humidity in September in Fort Smith?
How many days does it rain in September in Fort Smith?
When does it start snowing in Fort Smith?
How many hours of daylight does Fort Smith have in September?
What time are sunrise and sunset in September in Fort Smith?
How long on average sun shines in September in Fort Smith?
What is the UV index intensity in September in Fort Smith?
Average temperature in September
Fort Smith, MT
- Average high temperature in September: 71.4°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is December (29.7°F).
- Average low temperature in September: 51.3°F
The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is February (16.5°F).
Average pressure in September
Fort Smith, MT
- Average pressure in September: 29.94"Hg
The months with the highest atmospheric pressure are January and December (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in September
Fort Smith, MT
- Average wind speed in September: 7.2mph
The windiest month (with the highest average wind speed) is January (9.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in September
Fort Smith, MT
- Average humidity in September: 44%
The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is August (41%).
Average rainfall in September
Fort Smith, MT
- Average rainfall in September: 0.83"
The wettest month (with the highest rainfall) is May (2.01").
The driest month (with the least rainfall) is December (0.59").
Average rainfall days in September
Fort Smith, MT
- Average rainfall days in September: 9.9 days
The month with the highest number of rainy days is May (18 days).
The months with the least rainy days are January and December (6.3 days).
Average snowfall in September
Fort Smith, MT
- Average snowfall in September: 0.04"
The month with the highest snowfall is February (6.85").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Fort Smith, MT
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is February (14.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Fort Smith, MT
- Average daylight in September: 12h and 3min
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 4min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 42min).
Average sunshine days in September
Fort Smith, MT
- Average sunshine days in September: 15.8 days
The month with the most sunshine days is October (16.7 days).
The month with the least sunshine days is May (8.7 days).
Average UV index in September
Fort Smith, MT
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Fort Smith, MT
- Average cloud cover in September: 19
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 14).
Average visibility in September
Fort Smith, 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).
Fort Smith, Montana, USA
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