September weather forecastCentennial, WY
September
Weather in September
September, the first month of the autumn in Centennial, is also an agreeable month, with temperature in the range of an average high of 68.5°F (20.3°C) and an average low of 46°F (7.8°C).Temperature
In September, the meteorological conditions change slightly, with the average high-temperature moving from a warm 75.7°F (24.3°C) in August to an agreeable 68.5°F (20.3°C). September nights present a stark temperature decrease to a frosty 46°F (7.8°C).Humidity
In September, the average relative humidity in Centennial is 44%.Rainfall
In Centennial, in September, during 9.9 rainfall days, 1.02" (26mm) of precipitation is typically accumulated. Throughout the year, in Centennial, there are 110.5 rainfall days, and 14.57" (370mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall. September is the first month it typically snows in Centennial. Throughout September, in the average 0.9 snowfall days, it receives 0.43" (11mm) of snow. Throughout the year, in Centennial, Wyoming, there are 89 snowfall days, and 49.8" (1265mm) of snow is accumulated.Daylight
In Centennial, the average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:31 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:47 pm MDT.
Sunshine
In September, the average sunshine in Centennial is 10.8h.UV index
The average daily maximum UV index in September in Centennial is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 4 in September converts into the following recommendations:
Be vigilant - Preventing sunburn is recommended. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Centennial, WY
- Average high temperature in September: 68.5°F
The warmest month (with the highest average high temperature) is July (77°F).
The month with the lowest average high temperature is December (28.2°F).
- Average low temperature in September: 46°F
The month with the highest average low temperature is July (53.6°F).
The coldest month (with the lowest average low temperature) is December (14.2°F).
Average pressure in September
Centennial, WY
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Centennial, WY
- Average wind speed in September: 10.5mph
The windiest month (with the highest average wind speed) is January (14.1mph).
The calmest month (with the lowest average wind speed) is July (8.9mph).
Average humidity in September
Centennial, WY
- Average humidity in September: 44%
The month with the highest relative humidity is February (76%).
The month with the lowest relative humidity is August (43%).
Average rainfall in September
Centennial, WY
- Average rainfall in September: 1.02"
The wettest month (with the highest rainfall) is May (2.52").
The driest month (with the least rainfall) is January (0.51").
Average rainfall days in September
Centennial, WY
- Average rainfall days in September: 9.9 days
The month with the highest number of rainy days is July (14.9 days).
The month with the least rainy days is November (4 days).
Average snowfall in September
Centennial, WY
- Average snowfall in September: 0.43"
The month with the highest snowfall is April (9.84").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Centennial, WY
- Average snowfall days in September: 0.9 days
The month with the highest number of snowfall days is April (13.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Centennial, WY
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 10h and 48min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).
Average sunshine days in September
Centennial, WY
- Average sunshine days in September: 16.8 days
The month with the most sunshine days is January (19.4 days).
The month with the least sunshine days is May (9 days).
Average UV index in September
Centennial, WY
- Average UV index in September: 4
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
Centennial, WY
- Average cloud cover in September: 16
The month with the most cloud cover is February (Cloud cover 34).
The month with the least cloud cover is September (Cloud cover 16).
Average visibility in September
Centennial, 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).
