September weather forecastBig Piney, WY
September
Weather in September
September in Big Piney marks the start of the autumn season with cooler temperatures and a minimal increase in rainfall. Notably, temperatures drop from the 40s°F in August to highs of 66.4°F (19.1°C) and lows of 44.1°F (6.7°C) in September. Rainfall inches up to 0.83" (21mm) over 8.8 days, and a slight resurgence of snowfall at 0.59" (15mm), could be noted. Mild weather, changing leaves and an enchanting air denote the arrival of fall. This time proves to be the transition from summer to winter, reflecting the changing colors and shifting mood of Big Piney.Temperature
September is characterized by a mild reduction in the average high-temperature, from a moderately hot 75°F (23.9°C) in August to a refreshing 66.4°F (19.1°C). Big Piney undergoes a major shift from daytime highs, averaging a chilly 44.1°F (6.7°C) during the night in September.Humidity
In Big Piney, the average relative humidity in September is 44%.Rainfall
In Big Piney, during September, the rain falls for 8.8 days and regularly aggregates up to 0.83" (21mm) of precipitation. In Big Piney, during the entire year, the rain falls for 109.9 days and collects up to 10.59" (269mm) of precipitation.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 0.7 snowfall days, it receives 0.59" (15mm) of snow. Throughout the year, in Big Piney, there are 89 snowfall days, and 43.43" (1103mm) of snow is accumulated.Daylight
In September, the average length of the day in Big Piney is 12h and 28min.On the first day of September in Big Piney, sunrise is at 6:46 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 7:02 pm MDT.
Sunshine
In September, the average sunshine in Big Piney is 10.7h.UV index
In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: The maximum daily UV index, 3 in September, converts into the following recommendations:
Be vigilant - Suggestions to stave off sun damage are provided. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Big Piney, WY
- Average high temperature in September: 66.4°F
The warmest month (with the highest average high temperature) is July (76.8°F).
The month with the lowest average high temperature is December (23.7°F).
- Average low temperature in September: 44.1°F
The month with the highest average low temperature is July (52°F).
The coldest month (with the lowest average low temperature) is December (5°F).
Average pressure in September
Big Piney, WY
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.28"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Big Piney, WY
- Average wind speed in September: 5.8mph
The windiest month (with the highest average wind speed) is June (7mph).
The calmest month (with the lowest average wind speed) is December (5.3mph).
Average humidity in September
Big Piney, WY
- Average humidity in September: 44%
The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is August (39%).
Average rainfall in September
Big Piney, WY
- Average rainfall in September: 0.83"
The wettest month (with the highest rainfall) is May (1.65").
The driest months (with the least rainfall) are July and August (0.63").
Average rainfall days in September
Big Piney, WY
- Average rainfall days in September: 8.8 days
The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is November (6.9 days).
Average snowfall in September
Big Piney, WY
- Average snowfall in September: 0.59"
The month with the highest snowfall is April (7.36").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Big Piney, WY
- Average snowfall days in September: 0.7 days
The months with the highest number of snowfall days are February and March (15.1 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Big Piney, WY
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 10h and 42min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 6h and 12min).
Average sunshine days in September
Big Piney, WY
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is October (19.6 days).
The month with the least sunshine days is May (10.9 days).
Average UV index in September
Big Piney, WY
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 5).
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 Piney, WY
- Average cloud cover in September: 14
The month with the most cloud cover is February (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 12).
Average visibility in September
Big Piney, WY
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and February (4mi).
