September weather forecastDouglas, WY
September
Weather in September
As September ushers in the fall season in Douglas, the temperature slides down, and the rainfall inches down to 0.43" (11mm), marking its driest month. The daylight hours progressively decrease, heralding the upcoming winter. While the wind speed ascends slightly, the decline in UV index signals a cooler, gentler sun.Temperature
With the arrival of September, Douglas notices a mild change in the average high-temperature, sliding from August's warm 82.2°F (27.9°C) to a still moderately hot 73.6°F (23.1°C). The temperature dips to an average of 52.9°F (11.6°C) during September nights.Humidity
In Douglas, the average relative humidity in September is 42%.Rainfall
The month with the least rainfall is September, when the rain falls for 6.8 days and typically collects 0.43" (11mm) of precipitation.Snowfall
Months with snowfall in Douglas are January through May, September through December. September is the first month it typically snows in Douglas. Throughout September, in the average 0.2 snowfall days, it receives 0.16" (4mm) of snow. In Douglas, during the entire year, snow falls for 60.9 days and aggregates up to 34.21" (869mm) of snow.Daylight
The average length of the day in September is 12h and 29min.On the first day of September in Douglas, sunrise is at 6:27 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:43 pm MDT.
Sunshine
In September, the average sunshine is 11.1h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A daily maximum UV index of 4 in September translates into the following instructions:
Be vigilant - Suggestions to stave off sun damage are provided. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Douglas, WY
- Average high temperature in September: 73.6°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is December (31.3°F).
- Average low temperature in September: 52.9°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is December (18.1°F).
Average pressure in September
Douglas, WY
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Douglas, WY
- Average wind speed in September: 9.9mph
The windiest month (with the highest average wind speed) is January (12.9mph).
The calmest month (with the lowest average wind speed) is August (8.9mph).
Average humidity in September
Douglas, WY
- Average humidity in September: 42%
The month with the highest relative humidity is February (73%).
The month with the lowest relative humidity is August (40%).
Average rainfall in September
Douglas, WY
- Average rainfall in September: 0.43"
The wettest month (with the highest rainfall) is May (2.28").
The driest month (with the least rainfall) is September (0.43").
Average rainfall days in September
Douglas, WY
- Average rainfall days in September: 6.8 days
The month with the highest number of rainy days is May (15.2 days).
The month with the least rainy days is January (4.3 days).
Average snowfall in September
Douglas, WY
- Average snowfall in September: 0.16"
The month with the highest snowfall is April (5.59").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Douglas, WY
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is February (12.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Douglas, 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: 11h and 6min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is February (Average sunshine: 6h and 18min).
Average sunshine days in September
Douglas, WY
- Average sunshine days in September: 21.1 days
The month with the most sunshine days is October (21.6 days).
The month with the least sunshine days is April (11.3 days).
Average UV index in September
Douglas, WY
- Average UV index in September: 4
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, April, November and December (UV index 2).
Average cloud cover in September
Douglas, WY
- Average cloud cover in September: 14
The month with the most cloud cover is February (Cloud cover 34).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in September
Douglas, 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).
