September weather forecastBig Horn, WY
September
Weather in September
The first month of the autumn, September, is also an agreeable month in Big Horn, Wyoming, with an average temperature ranging between min 48.7°F (9.3°C) and max 68.7°F (20.4°C).Temperature
With the onset of September, Big Horn experiences a modest temperature adjustment, with the average high-temperature gently receding from a warm 77.4°F (25.2°C) in August to a pleasant 68.7°F (20.4°C). September nights in Big Horn are marked by an average low-temperature of 48.7°F (9.3°C).Humidity
In Big Horn, the average relative humidity in September is 48%.Rainfall
In Big Horn, during September, the rain falls for 12.5 days and regularly aggregates up to 1.42" (36mm) of precipitation. In Big Horn, during the entire year, the rain falls for 165.2 days and collects up to 21.22" (539mm) of precipitation.Snowfall
Months with snowfall in Big Horn are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.35" (9mm) of snow. In Big Horn, during the entire year, snow falls for 78.9 days and aggregates up to 46.3" (1176mm) of snow.Daylight
The average length of the day in September in Big Horn is 12h and 30min.On the first day of September, sunrise is at 6:31 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:49 pm MDT.
Sunshine
The average sunshine in September is 10.8h.UV index
In September, the average daily maximum UV index in Big Horn is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.Note: The average daily UV index of 4 in September transforms into the following instructions:
Put precautions into practice - Protective measures against sun-induced damage are advised. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Big Horn, WY
- Average high temperature in September: 68.7°F
The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is February (29.1°F).
- Average low temperature in September: 48.7°F
The month with the highest average low temperature is July (57°F).
The coldest month (with the lowest average low temperature) is February (14.4°F).
Average pressure in September
Big Horn, WY
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Big Horn, WY
- Average wind speed in September: 6.3mph
The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in September
Big Horn, WY
- Average humidity in September: 48%
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is August (46%).
Average rainfall in September
Big Horn, WY
- Average rainfall in September: 1.42"
The wettest month (with the highest rainfall) is May (3.43").
The driest month (with the least rainfall) is December (0.75").
Average rainfall days in September
Big Horn, WY
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is May (22.3 days).
The month with the least rainy days is November (7.5 days).
Average snowfall in September
Big Horn, WY
- Average snowfall in September: 0.35"
The month with the highest snowfall is April (8.7").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Big Horn, WY
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is February (15.8 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Big Horn, WY
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 10h and 48min
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 6min).
Average sunshine days in September
Big Horn, WY
- Average sunshine days in September: 13.6 days
The month with the most sunshine days is November (15.2 days).
The month with the least sunshine days is May (5.8 days).
Average UV index in September
Big Horn, WY
- 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, April, October, November and December (UV index 2).
Average cloud cover in September
Big Horn, WY
- Average cloud cover in September: 18
The months with the most cloud cover are February and April (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 15).
Average visibility in September
Big Horn, WY
- 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).
