September weather forecast
Dubois, WY

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Dubois, Wyoming, a winter view of the glorious Absaroka Mountains on Togwotee Region
Dubois, Wyoming, a winter view of the glorious Absaroka Mountains on Togwotee Region

Weather in September

September serves as a bridge between the heat of August and the autumn chill of October. This month experiences a decrease in rainfall, having just 0.71" (18mm) on average. The arrival of fall in September sees a slight increase in cloud cover, painting vivid landscapes filled with hues of yellow, orange, and red. The wind speed begins to pick up its pace, creating a whimsical atmosphere as leaves fall off the trees. Despite shorter daylight hours, the city remains well-lit under the afternoon sun.

Temperature

The start of September signals a gentle decrease in the average high-temperature, transitioning from a pleasant 71.8°F (22.1°C) in August to a refreshing 63.1°F (17.3°C). Dubois experiences a significant contrast between daily highs and an average nighttime temperature of 41.4°F (5.2°C) during September.

Humidity

In Dubois, the average relative humidity in September is 46%.

Rainfall

In Dubois, in September, during 7.5 rainfall days, 0.71" (18mm) of precipitation is typically accumulated. Throughout the year, there are 118.1 rainfall days, and 9.06" (230mm) of precipitation is accumulated.

Snowfall

January through June, September through December are months with snowfall in Dubois. September is the first month it typically snows in Dubois. Throughout September, in the average 0.5 snowfall days, it receives 0.59" (15mm) of snow. In Dubois, during the entire year, snow falls for 81 days and aggregates up to 30.83" (783mm) of snow.

Daylight

In Dubois, the average length of the day in September is 12h and 29min.
On the first day of the month, sunrise is at 6:43 am and sunset at 7:53 pm. On the last day of September, sunrise is at 7:15 am and sunset at 7:00 pm MDT.

Sunshine

The average sunshine in September in Dubois is 10.7h.

UV index

In Dubois, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: A typical high UV index of 3 in September suggests the following recommendations:
Act with care - Obligation to protect against skin and eye damage is highlighted. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
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Frequently asked questions

What is the usual temperature for Dubois in September?

In Dubois, 63.1°F (17.3°C) is the average high-temperature and 41.4°F (5.2°C) is the average low-temperature during September.

What is the average humidity in September in Dubois?

The average relative humidity in September is 46%.

How many days does it rain in September in Dubois?

In Dubois, Wyoming, in September, it is raining for 7.5 days, with typically 0.71" (18mm) of accumulated precipitation.

When does it start to snow in Dubois?

September is the first month it typically snows in Dubois, Wyoming. Throughout September, in the average 0.5 snowfall days, it receives 0.59" (15mm) of snow.

How many hours of daylight does Dubois have in September?

The average day length in September is 12h and 29min.

When is the sunrise / sunset in September in Dubois?

In September, on the first day of the month, sunrise is at 6:43 am and sunset at 7:53 pm. On the last day of the month, in Dubois, Wyoming, sunrise is at 7:15 am and sunset at 7:00 pm MDT.

How many hours of sunshine does Dubois have in September?

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

How high is the UV index in September in Dubois?

In September, the average daily maximum UV index is 3. A UV Index value 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
Dubois, WY

Average temperature in September - Dubois, WY
  • Average high temperature in September: 63.1°F

The warmest month (with the highest average high temperature) is July (73.8°F).
The month with the lowest average high temperature is December (24.4°F).

  • Average low temperature in September: 41.4°F

The month with the highest average low temperature is July (47.7°F).
The coldest month (with the lowest average low temperature) is December (8.2°F).

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Average pressure in September
Dubois, WY

Average pressure in September - Dubois, WY
  • Average pressure in September: 29.98"Hg

The month with the highest atmospheric pressure is January (30.23"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in September
Dubois, WY

Average wind speed in September - Dubois, WY
  • Average wind speed in September: 7.1mph

The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).

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Average humidity in September
Dubois, WY

Average humidity in September - Dubois, WY
  • Average humidity in September: 46%

The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is August (41%).

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Average rainfall in September
Dubois, WY

Average rainfall in September - Dubois, WY
  • Average rainfall in September: 0.71"

The wettest month (with the highest rainfall) is May (1.46").
The driest month (with the least rainfall) is January (0.35").

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Average rainfall days in September
Dubois, WY

Average rainfall days in September - Dubois, WY
  • Average rainfall days in September: 7.5 days

The month with the highest number of rainy days is May (14.4 days).
The month with the least rainy days is November (7 days).

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Average snowfall in September
Dubois, WY

Average snowfall in September - Dubois, WY
  • Average snowfall in September: 0.59"

The month with the highest snowfall is April (6.54").
The months with the least snowfall are July and August (0").

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Average snowfall days in September
Dubois, WY

Average snowfall days in September - Dubois, WY
  • Average snowfall days in September: 0.5 days

The month with the highest number of snowfall days is March (14.1 days).
The months with the least snowfall days are July and August (0 days).

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

Average daylight in September / Average sunshine in September - Dubois, 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 4min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The months with the least sunshine are January and December (Average sunshine: 6h and 48min).

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Average sunshine days in September
Dubois, WY

Average sunshine days in September - Dubois, WY
  • Average sunshine days in September: 17.2 days

The month with the most sunshine days is October (18.8 days).
The month with the least sunshine days is May (9 days).

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Average UV index in September
Dubois, WY

Average UV index in September - Dubois, WY
  • Average UV index in September: 3

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

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Average cloud cover in September
Dubois, WY

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

The months with the most cloud cover are February and April (Cloud cover 32).
The month with the least cloud cover is August (Cloud cover 13).

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Average visibility in September
Dubois, WY

Average visibility in September - Dubois, 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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Dubois, Wyoming, USA

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