Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
A mild drop in Gillette's average high-temperature is observed in September, transitioning from 82.4°F (28°C) in August to a still moderately hot 73.6°F (23.1°C). Gillette's nights in September experience an average temperature drop to a fresh 54.3°F (12.4°C).Humidity
The average relative humidity in September in Gillette, Wyoming, is 44%.Rainfall
In September, in Gillette, the rain falls for 10.2 days. Throughout September, 1.02" (26mm) of precipitation is accumulated. Throughout the year, in Gillette, there are 108.9 rainfall days, and 15.59" (396mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.4 snowfall days, it receives 0.31" (8mm) of snow. Throughout the year, in Gillette, there are 50.5 snowfall days, and 19.53" (496mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 30min.On the first day of September in Gillette, sunrise is at 6:25 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:43 pm MDT.
Sunshine
In Gillette, the average sunshine in September is 10.8h.UV index
In Gillette, Wyoming, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum high daily UV index of 4 during September translates into the following directions:
Take measures. Individuals with light skin might experience burns in under 30 minutes. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Gillette?
What is the average humidity in September in Gillette?
How much does it rain in Gillette in September?
When does it start to snow in Gillette?
What is the average length of the day in September in Gillette?
When are sunrise and sunset in September in Gillette?
How long on average sun shines in September in Gillette?
What is the UV index reading in September in Gillette?
Average temperature in September
Gillette, WY
- Average high temperature in September: 73.6°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (29.7°F).
- Average low temperature in September: 54.3°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is February (16.7°F).
Average pressure in September
Gillette, WY
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Gillette, WY
- Average wind speed in September: 10.1mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest months (with the lowest average wind speed) are July and August (9.1mph).
Average humidity in September
Gillette, WY
- Average humidity in September: 44%
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is August (41%).
Average rainfall in September
Gillette, WY
- Average rainfall in September: 1.02"
The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is January (0.39").
Average rainfall days in September
Gillette, WY
- Average rainfall days in September: 10.2 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (1.5 days).
Average snowfall in September
Gillette, WY
- Average snowfall in September: 0.31"
The month with the highest snowfall is April (3.82").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Gillette, WY
- Average snowfall days in September: 0.4 days
The month with the highest number of snowfall days is February (9.1 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Gillette, WY
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 10h and 5min
The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 36min).
Average sunshine days in September
Gillette, WY
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is December (22.4 days).
The month with the least sunshine days is May (9.3 days).
Average UV index in September
Gillette, WY
- Average UV index in September: 4
The months with the highest UV index are June, 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
Gillette, WY
- Average cloud cover in September: 18
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Gillette, 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).
Gillette, Wyoming, USA
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