September weather forecastGlenrock, WY
September
Weather in September
As summer inches towards its end, September brings a mild, pleasant weather to Glenrock, Wyoming. With temperatures sliding back into the bearable 70s and daylight hours reducing to 12.5 hours, the city begins preparing for autumn. However, the fair weather, toned down sunlight, and dwindling rainfall provide the perfect ambience for outdoor activities. It's a beautiful transition period, with summer's greenery gradually giving way to autumn's earthy hues. In conclusion, September's weather can be described as a gentle segue from summer's warmth to autumn's coolness, a wonderful merging of seasons.Temperature
A subtle change in temperatures is noted as August gives way to September, with average highs reducing from a moderately hot 81.1°F (27.3°C) to a pleasant 72.5°F (22.5°C). Nighttime temperature in Glenrock lowers to an average of 51.1°F (10.6°C) in September.Humidity
In September, the average relative humidity is 41%.Rainfall
In Glenrock, during September, the rain falls for 8.2 days and regularly aggregates up to 0.67" (17mm) of precipitation. In Glenrock, during the entire year, the rain falls for 101.1 days and collects up to 11.54" (293mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.2" (5mm) of snow. Throughout the year, there are 65.9 snowfall days, and 33.03" (839mm) 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 6:29 am and sunset at 7:37 pm. On the last day of September, sunrise is at 7:00 am and sunset at 6:45 pm MDT.
Sunshine
The average sunshine in September in Glenrock is 10.9h.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 unsafe exposure to UV radiation for the average person.Note: The daily high UV index of 4 in September translates into this advice:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Glenrock, WY
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is December (29.3°F).
- Average low temperature in September: 51.1°F
The month with the highest average low temperature is July (59.7°F).
The coldest month (with the lowest average low temperature) is December (16.2°F).
Average pressure in September
Glenrock, WY
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Glenrock, WY
- Average wind speed in September: 9.8mph
The windiest month (with the highest average wind speed) is January (13mph).
The calmest months (with the lowest average wind speed) are July and August (8.8mph).
Average humidity in September
Glenrock, WY
- Average humidity in September: 41%
The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is August (39%).
Average rainfall in September
Glenrock, WY
- Average rainfall in September: 0.67"
The wettest month (with the highest rainfall) is May (1.85").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days in September
Glenrock, WY
- Average rainfall days in September: 8.2 days
The month with the highest number of rainy days is May (14.8 days).
The months with the least rainy days are January and December (4.9 days).
Average snowfall in September
Glenrock, WY
- Average snowfall in September: 0.2"
The month with the highest snowfall is November (4.84").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Glenrock, WY
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is February (11.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Glenrock, WY
- Average daylight in September: 12h and 30min
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: 10h and 54min
The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 0min).
Average sunshine days in September
Glenrock, WY
- Average sunshine days in September: 18.7 days
The month with the most sunshine days is November (18.9 days).
The months with the least sunshine days are April and May (11.3 days).
Average UV index in September
Glenrock, 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, October, November and December (UV index 2).
Average cloud cover in September
Glenrock, WY
- Average cloud cover in September: 15
The month with the most cloud cover is February (Cloud cover 36).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in September
Glenrock, 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).
