September weather forecast
Laramie, WY

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A broken pulley in front of a farmhouse in a ranch in Laramie, Wyoming
A broken pulley in front of a farmhouse in a ranch in Laramie, Wyoming

Weather in September

September in Laramie, Wyoming, sees a smooth transition from simmering summer to the golden tones of fall. The scorching sun softens to a welcoming warm glow, coloring the foliage in hues of yellow and orange. A slight nip returns to the air as the temperature ranges from 46.8°F (8.2°C) in the mornings to a cool 68.4°F (20.2°C) during the day. The change in weather indicates a shift in the seasonal energy. Outdoor enthusiasts find joy in the serene atmosphere that accompanies the onset of the autumn season.

Temperature

As August shifts into September, a minor alteration in temperatures is observed, with average highs reducing from a moderately hot 75.7°F (24.3°C) to an agreeable 68.4°F (20.2°C). Laramie records a consistent low-temperature average of 46.8°F (8.2°C) during September, indicating a significant difference from the daytime heat.

Humidity

In September, the average relative humidity is 44%.

Rainfall

In Laramie, during September, the rain falls for 9.9 days and regularly aggregates up to 0.98" (25mm) of precipitation. Throughout the year, there are 101.6 rainfall days, and 14.33" (364mm) of precipitation is accumulated.

Snowfall

January through June, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.7 snowfall days, it receives 0.35" (9mm) of snow. Throughout the year, in Laramie, there are 77.7 snowfall days, and 44.8" (1138mm) of snow is accumulated.

Daylight

In September, the average length of the day is 12h and 28min.
On the first day of the month, sunrise is at 6:29 am and sunset at 7:34 pm. On the last day of September, sunrise is at 6:58 am and sunset at 6:45 pm MDT.

Sunshine

In September, the average sunshine is 10.9h.

UV index

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: A maximum high UV index of 4 in September translates into the following recommendations:
Prioritize safety - Suggestions to prevent sun damage are offered. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Updated: Jun 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Laramie in September?

In September, in Laramie, the average high-temperature is 68.4°F (20.2°C), and the average low-temperature is 46.8°F (8.2°C).

What is the average humidity in September?

The average relative humidity in September is 44%.

How much does it rain in September?

In Laramie, in September, it is raining for 9.9 days, with typically 0.98" (25mm) of accumulated precipitation.

When does it start to snow?

September is the first month it typically snows. Throughout September, in the average 0.7 snowfall days, it receives 0.35" (9mm) of snow.

What is the average length of the day in September?

The average day length in September is 12h and 28min.

What time are sunrise and sunset in September in Laramie?

On the first day of September in Laramie, sunrise is at 6:29 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:45 pm MDT.

How long on average sun shines in September?

In September, the average sunshine duration is 10.9h.

What is the UV index reading in September?

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability 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
Laramie, WY

Average temperature in September - Laramie, WY
  • Average high temperature in September: 68.4°F

The warmest month (with the highest average high temperature) is July (76.8°F).
The month with the lowest average high temperature is December (28.2°F).

  • Average low temperature in September: 46.8°F

The month with the highest average low temperature is July (54.1°F).
The coldest month (with the lowest average low temperature) is December (14.4°F).

Average pressure in September
Laramie, WY

Average pressure in September - Laramie, WY
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

Average wind speed in September
Laramie, WY

Average wind speed in September - Laramie, WY
  • Average wind speed in September: 10.9mph

The windiest month (with the highest average wind speed) is January (14.5mph).
The calmest month (with the lowest average wind speed) is July (9.3mph).

Average humidity in September
Laramie, WY

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

The months with the highest relative humidity are January and February (75%).
The month with the lowest relative humidity is August (43%).

Average rainfall in September
Laramie, WY

Average rainfall in September - Laramie, WY
  • Average rainfall in September: 0.98"

The wettest month (with the highest rainfall) is May (2.68").
The driest month (with the least rainfall) is January (0.35").

Average rainfall days in September
Laramie, WY

Average rainfall days in September - Laramie, WY
  • Average rainfall days in September: 9.9 days

The months with the highest number of rainy days are May and July (15.1 days).
The months with the least rainy days are January, February and November (2.9 days).

Average snowfall in September
Laramie, WY

Average snowfall in September - Laramie, WY
  • Average snowfall in September: 0.35"

The month with the highest snowfall is April (9.76").
The months with the least snowfall are July and August (0").

Average snowfall days in September
Laramie, WY

Average snowfall days in September - Laramie, WY
  • Average snowfall days in September: 0.7 days

The month with the highest number of snowfall days is April (12.5 days).
The months with the least snowfall days are July and August (0 days).

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

Average daylight in September / Average sunshine in September - Laramie, WY
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 10h and 5min

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

Average sunshine days in September
Laramie, WY

Average sunshine days in September - Laramie, WY
  • Average sunshine days in September: 16.2 days

The month with the most sunshine days is January (21.4 days).
The month with the least sunshine days is May (8.9 days).

Average UV index in September
Laramie, WY

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

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

Average cloud cover in September
Laramie, WY

Average cloud cover in September - Laramie, WY
  • Average cloud cover in September: 17

The month with the most cloud cover is February (Cloud cover 34).
The month with the least cloud cover is September (Cloud cover 17).

Average visibility in September
Laramie, WY

Average visibility in September - Laramie, 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).

Laramie, Wyoming, USA

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