September weather forecastBig Timber, MT
September
Weather in September
September brings the first signs of autumn in Big Timber with temperatures easing off, daylight hours reducing, and a slight increase in rainfall. Chilly early mornings and late evenings contrast with milder afternoons, dressing the city in a spectrum of fall colors. The only snowfall in the last quarter- 0.51" (13mm), marks the onset of winter. Farmers markets thrive with fall harvests, while hikers are treated to the vibrant hues of fall foliage. Picturesque autumn landscapes, cool weather, and clear blue skies bring about a magical aura that attracts visitors from far and wide.Temperature
The onset of September coincides with a reduction in the average high-temperature, falling from a moderately hot 76.6°F (24.8°C) in August to a refreshing 66.7°F (19.3°C). During September, the nighttime temperature averages of 45.3°F (7.4°C).Humidity
In Big Timber, the average relative humidity in September is 51%.Rainfall
In Big Timber, in September, during 9.8 rainfall days, 1.1" (28mm) of precipitation is typically accumulated. Throughout the year, there are 129.6 rainfall days, and 15.83" (402mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows in Big Timber, Montana. Throughout September, in the average 1 snowfall days, it receives 0.51" (13mm) of snow. Throughout the year, there are 67.6 snowfall days, and 38.19" (970mm) of snow is accumulated.Daylight
In Big Timber, the average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 6:41 am and sunset at 7:57 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 7:01 pm MDT.
Sunshine
In September, the average sunshine is 10.2h.UV index
In September, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: In September, the maximum UV index of 3 suggests this advice:
Ensure safety - Recommendations to avert sunburn are presented. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. 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
Big Timber, MT
- Average high temperature in September: 66.7°F
The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is December (28.4°F).
- Average low temperature in September: 45.3°F
The month with the highest average low temperature is August (52.9°F).
The coldest month (with the lowest average low temperature) is February (15.3°F).
Average pressure in September
Big Timber, MT
- Average pressure in September: 29.96"Hg
The months with the highest atmospheric pressure are January and December (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Big Timber, MT
- Average wind speed in September: 6.9mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).
Average humidity in September
Big Timber, MT
- Average humidity in September: 51%
The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is August (47%).
Average rainfall in September
Big Timber, MT
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is May (3.15").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in September
Big Timber, MT
- Average rainfall days in September: 9.8 days
The month with the highest number of rainy days is May (19.8 days).
The months with the least rainy days are January and December (5.3 days).
Average snowfall in September
Big Timber, MT
- Average snowfall in September: 0.51"
The month with the highest snowfall is March (7.09").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Big Timber, MT
- Average snowfall days in September: 1 days
The month with the highest number of snowfall days is February (12.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Big Timber, 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 12min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 12min).
Average sunshine days in September
Big Timber, MT
- Average sunshine days in September: 17.8 days
The month with the most sunshine days is January (19.8 days).
The month with the least sunshine days is May (7.7 days).
Average UV index in September
Big Timber, MT
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in September
Big Timber, MT
- Average cloud cover in September: 21
The month with the most cloud cover is February (Cloud cover 41).
The months with the least cloud cover are July and August (Cloud cover 16).
Average visibility in September
Big Timber, 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).
