September weather forecastKemmerer, WY
September
Weather in September
The arrival of September announces the start of fall in Kemmerer, reflecting pleasant and cooler temperatures compared to the hotter August. The transition from summer to fall becomes evident with rainfall slightly increasing to 0.83" (21mm) and the temperatures beginning to fall. The town's weather continues to support outdoor activities with an average of 12.5 daylight hours, albeit with shorter days compared to the summer months. Meanwhile, humidity begins to rise signaling the onset of the cooler and damper fall season. As September progresses, Kemmerer sees more cloud cover, replacing the clear, sunny skies of summer.Temperature
In Kemmerer, the beginning of September is marked by a lowered average high-temperature, shifting from August's warm 77.9°F (25.5°C) to an agreeable 68.9°F (20.5°C). September nights in Kemmerer, Wyoming, are marked by an average low-temperature of 47.7°F (8.7°C).Humidity
The average relative humidity in September in Kemmerer is 40%.Rainfall
In Kemmerer, in September, during 8.6 rainfall days, 0.83" (21mm) of precipitation is typically accumulated. In Kemmerer, during the entire year, the rain falls for 96.8 days and collects up to 11.46" (291mm) of precipitation.Snowfall
January through June, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.7 snowfall days, it receives 0.35" (9mm) of snow. In Kemmerer, during the entire year, snow falls for 88.9 days and aggregates up to 38.86" (987mm) of snow.Daylight
In September, the average length of the day is 12h and 28min.On the first day of September, sunrise is at 6:48 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 7:04 pm MDT.
Sunshine
In September, the average sunshine is 10.5h.UV index
In September, the average daily maximum UV index in Kemmerer is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.Note: The daily high UV index of 4 during September translates into the following recommendations:
Undertake precautions - It is suggested to shield oneself from sunburn. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Kemmerer, WY
- Average high temperature in September: 68.9°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is December (25.7°F).
- Average low temperature in September: 47.7°F
The month with the highest average low temperature is July (55°F).
The coldest month (with the lowest average low temperature) is January (9.9°F).
Average pressure in September
Kemmerer, WY
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Kemmerer, WY
- Average wind speed in September: 8.3mph
The windiest month (with the highest average wind speed) is April (9.8mph).
The calmest month (with the lowest average wind speed) is July (7.5mph).
Average humidity in September
Kemmerer, WY
- Average humidity in September: 40%
The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is August (35%).
Average rainfall in September
Kemmerer, WY
- Average rainfall in September: 0.83"
The wettest month (with the highest rainfall) is May (2.01").
The driest month (with the least rainfall) is August (0.59").
Average rainfall days in September
Kemmerer, WY
- Average rainfall days in September: 8.6 days
The month with the highest number of rainy days is May (13.3 days).
The month with the least rainy days is February (5 days).
Average snowfall in September
Kemmerer, WY
- Average snowfall in September: 0.35"
The month with the highest snowfall is March (6.81").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Kemmerer, WY
- Average snowfall days in September: 0.7 days
The month with the highest number of snowfall days is February (15.3 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Kemmerer, WY
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 10h and 30min
The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 5h and 42min).
Average sunshine days in September
Kemmerer, WY
- Average sunshine days in September: 19.3 days
The month with the most sunshine days is October (19.4 days).
The month with the least sunshine days is April (9.7 days).
Average UV index in September
Kemmerer, 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
Kemmerer, WY
- Average cloud cover in September: 14
The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 12).
Average visibility in September
Kemmerer, 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).
