Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The shift from August to September corresponds with a decrease in the average high-temperature, down to a still moderately hot 75.6°F (24.2°C) from a warm 84.9°F (29.4°C). A considerable shift from the daytime highs is observed in Arapahoe during September nights, with an average low of 52.9°F (11.6°C).Humidity
The average relative humidity in September in Arapahoe is 35%.Rainfall
In September, the rain falls for 6.3 days. Throughout September, 0.43" (11mm) of precipitation is accumulated. In Arapahoe, during the entire year, the rain falls for 67.6 days and collects up to 6.81" (173mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, there are 42.7 snowfall days, and 24.92" (633mm) of snow is accumulated.Daylight
In September, the average length of the day in Arapahoe is 12h and 29min.On the first day of September, sunrise is at 6:39 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 6:56 pm MDT.
Sunshine
In Arapahoe, the average sunshine in September is 10.8h.UV index
In September, the average daily maximum UV index in Arapahoe is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The UV index of 4 in September translates into these instructions:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. To guard against the harmful effects of the Sun, minimize exposure during midday. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Frequently asked questions
What is the temperature in September in Arapahoe?
What is the average humidity in September in Arapahoe?
How many days does it rain in September in Arapahoe?
When does it start snowing in Arapahoe?
What is the average length of the day in September in Arapahoe?
When are sunrise and sunset in September in Arapahoe?
How long on average sun shines in September in Arapahoe?
What is the UV index reading in September in Arapahoe?
Average temperature in September
Arapahoe, WY
- Average high temperature in September: 75.6°F
The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is December (30.9°F).
- Average low temperature in September: 52.9°F
The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (14.5°F).
Average pressure in September
Arapahoe, WY
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Arapahoe, WY
- Average wind speed in September: 6.5mph
The windiest month (with the highest average wind speed) is June (7.5mph).
The calmest month (with the lowest average wind speed) is January (5.5mph).
Average humidity in September
Arapahoe, WY
- Average humidity in September: 35%
The month with the highest relative humidity is January (77%).
The months with the lowest relative humidity are July and August (31%).
Average rainfall in September
Arapahoe, WY
- Average rainfall in September: 0.43"
The wettest month (with the highest rainfall) is May (1.42").
The driest month (with the least rainfall) is January (0.24").
Average rainfall days in September
Arapahoe, WY
- Average rainfall days in September: 6.3 days
The month with the highest number of rainy days is May (9.9 days).
The month with the least rainy days is January (2.5 days).
Average snowfall in September
Arapahoe, WY
- Average snowfall in September: 0.08"
The month with the highest snowfall is April (5.39").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Arapahoe, WY
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is February (7.8 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Arapahoe, WY
- Average daylight in September: 12h and 3min
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: 10h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 6h and 36min).
Average sunshine days in September
Arapahoe, WY
- Average sunshine days in September: 19.6 days
The month with the most sunshine days is January (24.5 days).
The month with the least sunshine days is April (15.5 days).
Average UV index in September
Arapahoe, WY
- Average UV index in September: 4
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Arapahoe, WY
- Average cloud cover in September: 13
The months with the most cloud cover are February and April (Cloud cover 28).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in September
Arapahoe, 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).
Arapahoe, Wyoming, USA
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