September weather forecast
Cheyenne, WY

A sunny day in front of the State Capitol building in Cheyenne, Wyoming
A sunny day in front of the State Capitol building in Cheyenne, Wyoming

Weather in September

September, the first month of the autumn in Cheyenne, is still a warm month, with an average temperature ranging between min 52.3°F (11.3°C) and max 73.8°F (23.2°C).

Temperature

In Cheyenne, the average high-temperature in September slightly decreases from 81.1°F (27.3°C) in August to a still warm 73.8°F (23.2°C). In Cheyenne, the average low-temperature is 52.3°F (11.3°C).

Humidity

In September, the average relative humidity in Cheyenne is 44%.

Rainfall

In Cheyenne, during 8.4 rainfall days, 0.87" (22mm) of precipitation is typically accumulated. Throughout the year, in Cheyenne, there are 116 rainfall days, and 14.57" (370mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall in Cheyenne.

Daylight

In Cheyenne, the average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 6:25 am and sunset at 7:32 pm. On the last day of September, in Cheyenne, sunrise is at 6:54 am and sunset at 6:43 pm MDT.

Sunshine

The average sunshine in September in Cheyenne, Wyoming, is 10.7h.

UV index

The average daily maximum UV index in September in Cheyenne is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in September in Cheyenne?

In Cheyenne, in September, the average high-temperature is 73.8°F (23.2°C), and the average low-temperature is 52.3°F (11.3°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which represents the influence of relative humidity on air temperature, in August is appraised at 80.6°F (27°C).

What is the average humidity in September in Cheyenne?

The average relative humidity in September is 44%.

How many days does it rain in September in Cheyenne?

In Cheyenne, Wyoming, in September, it is raining for 8.4 days, with typically 0.87" (22mm) of accumulated precipitation.

When it does not snow in Cheyenne?

June through September are months without snowfall in Cheyenne, Wyoming.

Does it snow in Cheyenne in September?

In Cheyenne, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September in Cheyenne?

The average day length in September is 12h and 27min.

When are sunrise and sunset in September in Cheyenne?

On the first day of September, sunrise is at 6:25 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:54 am and sunset at 6:43 pm MDT.

How many hours of sunshine does Cheyenne have in September?

The average sunshine duration in September in Cheyenne, Wyoming, is 10.7h.

How high is the UV index in September in Cheyenne?

The average daily maximum UV index in September in Cheyenne, Wyoming, is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Cheyenne, WY

Average temperature in September - Cheyenne, WY
  • Average high temperature in September: 73.8°F

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is December (34.7°F).

  • Average low temperature in September: 52.3°F

The month with the highest average low temperature is July (59.9°F).
The coldest month (with the lowest average low temperature) is December (20.3°F).

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Average pressure in September
Cheyenne, WY

Average pressure in September - Cheyenne, WY
  • Average pressure in September: 29.96"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).

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Average wind speed in September
Cheyenne, WY

Average wind speed in September - Cheyenne, WY
  • Average wind speed in September: 9.6mph

The windiest month (with the highest average wind speed) is January (14.2mph).
The calmest month (with the lowest average wind speed) is August (8.7mph).

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Average humidity in September
Cheyenne, WY

Average humidity in September - Cheyenne, WY
  • Average humidity in September: 44%

The month with the highest relative humidity is February (64%).
The month with the lowest relative humidity is August (43%).

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Average rainfall in September
Cheyenne, WY

Average rainfall in September - Cheyenne, WY
  • Average rainfall in September: 0.87"

The wettest month (with the highest rainfall) is May (2.95").
The driest month (with the least rainfall) is January (0.43").

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Average rainfall days in September
Cheyenne, WY

Average rainfall days in September - Cheyenne, WY
  • Average rainfall days in September: 8.4 days

The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (4.7 days).

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Average snowfall in September
Cheyenne, WY

Average snowfall in September - Cheyenne, WY
  • Average snowfall in September: 0"

The month with the highest snowfall is March (6.06").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Cheyenne, WY

Average snowfall days in September - Cheyenne, WY
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is February (11.3 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in September /
Average sunshine in September
Cheyenne, WY

Average daylight in September / Average sunshine in September - Cheyenne, WY
  • Average daylight in September: 12h and 27min

The month with the longest days is June (Average daylight: 15h and 5min).
The month with the shortest days is December (Average daylight: 9h and 16min).

  • Average sunshine in September: 10h and 42min

The months with the most sunshine are July and August (Average sunshine: 11h and 36min).
The month with the least sunshine is February (Average sunshine: 6h and 30min).

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Average sunshine days in September
Cheyenne, WY

Average sunshine days in September - Cheyenne, WY
  • Average sunshine days in September: 19 days

The month with the most sunshine days is January (20.7 days).
The month with the least sunshine days is April (9.3 days).

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Average UV index in September
Cheyenne, WY

Average UV index in September - Cheyenne, WY
  • Average UV index in September: 4

The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Cheyenne, WY

Average cloud cover in September - Cheyenne, WY
  • Average cloud cover in September: 18

The months with the most cloud cover are April and May (Cloud cover 32).
The month with the least cloud cover is September (Cloud cover 18).

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Average visibility in September
Cheyenne, WY

Average visibility in September - Cheyenne, 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).

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