September weather forecast
Douglas, WY

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Weather in September

As September ushers in the fall season in Douglas, the temperature slides down, and the rainfall inches down to 0.43" (11mm), marking its driest month. The daylight hours progressively decrease, heralding the upcoming winter. While the wind speed ascends slightly, the decline in UV index signals a cooler, gentler sun.

Temperature

With the arrival of September, Douglas notices a mild change in the average high-temperature, sliding from August's warm 82.2°F (27.9°C) to a still moderately hot 73.6°F (23.1°C). The temperature dips to an average of 52.9°F (11.6°C) during September nights.

Humidity

In Douglas, the average relative humidity in September is 42%.

Rainfall

The month with the least rainfall is September, when the rain falls for 6.8 days and typically collects 0.43" (11mm) of precipitation.

Snowfall

Months with snowfall in Douglas are January through May, September through December. September is the first month it typically snows in Douglas. Throughout September, in the average 0.2 snowfall days, it receives 0.16" (4mm) of snow. In Douglas, during the entire year, snow falls for 60.9 days and aggregates up to 34.21" (869mm) of snow.

Daylight

The average length of the day in September is 12h and 29min.
On the first day of September in Douglas, sunrise is at 6:27 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:43 pm MDT.

Sunshine

In September, the average sunshine is 11.1h.

UV index

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A daily maximum UV index of 4 in September translates into the following instructions:
Be vigilant - Suggestions to stave off sun damage are provided. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Updated: Feb 14, 2024 | Published by: Weather U.S. | About Us / Weather Forecasting / Data Sources

Frequently asked questions

What is the temperature in September in Douglas?

The average high-temperature, in September, in Douglas, is 73.6°F (23.1°C), while the average low-temperature is 52.9°F (11.6°C). In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is computed to be 82.4°F (28°C).

What is the average humidity in September in Douglas?

In Douglas, the average relative humidity in September is 42%.

What is the driest month in Douglas?

September is the month with the least rainfall in Douglas, Wyoming. Rain falls for 6.8 days and accumulates 0.43" (11mm) of precipitation.

How many days does it rain in September in Douglas?

In Douglas, Wyoming, in September, it is raining for 6.8 days, with typically 0.43" (11mm) of accumulated precipitation.

When does it start snowing in Douglas?

September is the first month it typically snows in Douglas. Throughout September, in the average 0.2 snowfall days, it receives 0.16" (4mm) of snow.

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

In September, the average day length in Douglas, Wyoming, is 12h and 29min.

When is the sunrise / sunset in September in Douglas?

On the first day of September in Douglas, Wyoming, sunrise is at 6:27 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:43 pm MDT.

How many hours of sunshine does Douglas have in September?

In Douglas, Wyoming, the average sunshine duration in September is 11.1h.

How high is the UV index in September in Douglas?

In Douglas, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Douglas, WY

Average temperature in September - Douglas, WY
  • Average high temperature in September: 73.6°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is December (31.3°F).

  • Average low temperature in September: 52.9°F

The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is December (18.1°F).

Average pressure in September
Douglas, WY

Average pressure in September - Douglas, WY
  • Average pressure in September: 29.94"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

Average wind speed in September
Douglas, WY

Average wind speed in September - Douglas, WY
  • Average wind speed in September: 9.9mph

The windiest month (with the highest average wind speed) is January (12.9mph).
The calmest month (with the lowest average wind speed) is August (8.9mph).

Average humidity in September
Douglas, WY

Average humidity in September - Douglas, WY
  • Average humidity in September: 42%

The month with the highest relative humidity is February (73%).
The month with the lowest relative humidity is August (40%).

Average rainfall in September
Douglas, WY

Average rainfall in September - Douglas, WY
  • Average rainfall in September: 0.43"

The wettest month (with the highest rainfall) is May (2.28").
The driest month (with the least rainfall) is September (0.43").

Average rainfall days in September
Douglas, WY

Average rainfall days in September - Douglas, WY
  • Average rainfall days in September: 6.8 days

The month with the highest number of rainy days is May (15.2 days).
The month with the least rainy days is January (4.3 days).

Average snowfall in September
Douglas, WY

Average snowfall in September - Douglas, WY
  • Average snowfall in September: 0.16"

The month with the highest snowfall is April (5.59").
The months with the least snowfall are June, July and August (0").

Average snowfall days in September
Douglas, WY

Average snowfall days in September - Douglas, WY
  • Average snowfall days in September: 0.2 days

The month with the highest number of snowfall days is February (12.2 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in September / Average sunshine in September - Douglas, 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: 11h and 1min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is February (Average sunshine: 6h and 18min).

Average sunshine days in September
Douglas, WY

Average sunshine days in September - Douglas, WY
  • Average sunshine days in September: 21.1 days

The month with the most sunshine days is October (21.6 days).
The month with the least sunshine days is April (11.3 days).

Average UV index in September
Douglas, WY

Average UV index in September - Douglas, 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, April, November and December (UV index 2).

Average cloud cover in September
Douglas, WY

Average cloud cover in September - Douglas, WY
  • Average cloud cover in September: 14

The month with the most cloud cover is February (Cloud cover 34).
The month with the least cloud cover is August (Cloud cover 13).

Average visibility in September
Douglas, WY

Average visibility in September - Douglas, 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).

Douglas, Wyoming, USA

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