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 coincides with a small decrease in the average high-temperature, down to an enjoyable 62.1°F (16.7°C) from a pleasant 70.3°F (21.3°C). Nightly readings in September display a noticeable downturn from daily highs, with the average low-temperature registering an icy 37°F (2.8°C).Humidity
In September, the average relative humidity is 57%.Rainfall
In Kelly, in September, it is raining for 12.2 days, with typically 1.97" (50mm) of accumulated precipitation. In Kelly, during the entire year, the rain falls for 116.8 days and collects up to 27.95" (710mm) of precipitation.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 1.5 snowfall days, it receives 1.93" (49mm) of snow. Throughout the year, there are 130.7 snowfall days, and 137.48" (3492mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 29min.On the first day of the month, sunrise is at 6:47 am and sunset at 7:57 pm. On the last day of September, sunrise is at 7:19 am and sunset at 7:04 pm MDT.
Sunshine
The average sunshine in September is 10h.UV index
In September, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for ordinary individuals.Note: An average UV index of 2 in September transforms into this advice:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Kelly in September?
What is the average humidity in September?
How many days does it rain in September?
When does it start to snow?
How many hours of daylight does Kelly have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Kelly have in September?
What is the UV index reading in September?
Average temperature in September
Kelly, WY
- Average high temperature in September: 62.1°F
The warmest month (with the highest average high temperature) is July (72°F).
The month with the lowest average high temperature is December (21°F).
- Average low temperature in September: 37°F
The month with the highest average low temperature is July (43.9°F).
The coldest month (with the lowest average low temperature) is December (4.1°F).
Average pressure in September
Kelly, WY
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Kelly, WY
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is June (5.8mph).
The calmest months (with the lowest average wind speed) are January and December (4.5mph).
Average humidity in September
Kelly, WY
- Average humidity in September: 57%
The month with the highest relative humidity is February (94%).
The month with the lowest relative humidity is August (50%).
Average rainfall in September
Kelly, WY
- Average rainfall in September: 1.97"
The wettest month (with the highest rainfall) is February (3.23").
The driest month (with the least rainfall) is August (1.42").
Average rainfall days in September
Kelly, WY
- Average rainfall days in September: 12.2 days
The month with the highest number of rainy days is May (16.2 days).
The months with the least rainy days are January and February (3.9 days).
Average snowfall in September
Kelly, WY
- Average snowfall in September: 1.93"
The month with the highest snowfall is February (25.94").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Kelly, WY
- Average snowfall days in September: 1.5 days
The month with the highest number of snowfall days is December (21.7 days).
The month with the least snowfall days is July (0 days).
Average daylight in September /
Average sunshine in September
Kelly, WY
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 10h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 3h and 36min).
Average sunshine days in September
Kelly, WY
- Average sunshine days in September: 15.2 days
The month with the most sunshine days is July (15.6 days).
The month with the least sunshine days is April (7 days).
Average UV index in September
Kelly, WY
- Average UV index in September: 2
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, October, November and December (UV index 1).
Average cloud cover in September
Kelly, WY
- Average cloud cover in September: 20
The month with the most cloud cover is February (Cloud cover 71).
The month with the least cloud cover is August (Cloud cover 15).
Average visibility in September
Kelly, WY
- Average visibility in September: 6mi
The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January and February (2mi).
Kelly, Wyoming, USA
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