September weather forecastPowell, WY
September
Weather in September
September signifies the initiation of fall season in Powell, Wyoming, with revealing signs such as cooler nights and leaves changing colors. The switch to autumnal conditions is brought into sharp focus by the rainfall figures, amounting to 0.71" (18mm). Seasonal onset in October witnesses a further downturn in temperature but brings a surge in the vibrancy of the fall foliage. Compared to August, the change in weather is palpable, with noticeable shortening of days and cooler temperatures paving the way for the approaching winter. This period, bridging summer and winter, finds residents drifting towards indoor leisure pursuits.Temperature
Powell's weather in September involves a decrease in the average high-temperature, moving down from August's moderately hot 81.3°F (27.4°C) to a pleasant 72.1°F (22.3°C). The temperature dips to an average of 51.1°F (10.6°C) during September nights.Humidity
In September, the average relative humidity in Powell is 40%.Rainfall
In Powell, Wyoming, in September, it is raining for 7.1 days, with typically 0.71" (18mm) of accumulated precipitation. Throughout the year, there are 105.7 rainfall days, and 8.19" (208mm) of precipitation is accumulated.Snowfall
Months with snowfall in Powell are January through June, September through December. September is the first month it typically snows in Powell. Throughout September, in the average 0.2 snowfall days, it receives 0.16" (4mm) of snow. Throughout the year, there are 52.1 snowfall days, and 16.97" (431mm) of snow is accumulated.Daylight
The average length of the day in September in Powell is 12h and 30min.On the first day of the month, sunrise is at 6:38 am and sunset at 7:51 pm. On the last day of September, sunrise is at 7:12 am and sunset at 6:56 pm MDT.
Sunshine
In September, the average sunshine in Powell, Wyoming, is 10.8h.UV index
In September, the average daily maximum UV index in Powell is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Avoiding the Sun during its peak radiation time around midday is a healthy practice. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Powell, WY
- Average high temperature in September: 72.1°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 (29.7°F).
- Average low temperature in September: 51.1°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is December (15.6°F).
Average pressure in September
Powell, WY
- Average pressure in September: 29.97"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
Powell, WY
- Average wind speed in September: 6.7mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in September
Powell, WY
- Average humidity in September: 40%
The month with the highest relative humidity is January (76%).
The months with the lowest relative humidity are July and August (37%).
Average rainfall in September
Powell, WY
- Average rainfall in September: 0.71"
The wettest month (with the highest rainfall) is May (1.5").
The driest month (with the least rainfall) is January (0.31").
Average rainfall days in September
Powell, WY
- Average rainfall days in September: 7.1 days
The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is December (4.9 days).
Average snowfall in September
Powell, WY
- Average snowfall in September: 0.16"
The month with the highest snowfall is February (3.9").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Powell, WY
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is February (11 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Powell, 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: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 42min).
Average sunshine days in September
Powell, WY
- Average sunshine days in September: 17.9 days
The month with the most sunshine days is December (21.7 days).
The month with the least sunshine days is May (11.3 days).
Average UV index in September
Powell, WY
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Powell, WY
- Average cloud cover in September: 15
The month with the most cloud cover is February (Cloud cover 32).
The month with the least cloud cover is July (Cloud cover 13).
Average visibility in September
Powell, 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).
