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
In Thermopolis, the beginning of September is marked by a marginally lowered average high-temperature, shifting from August's moderately hot 81.9°F (27.7°C) to a pleasant 73°F (22.8°C). Nighttime temperatures in September average to a fresh 52°F (11.1°C) in Thermopolis.Humidity
In Thermopolis, the average relative humidity in September is 38%.Rainfall
In September, in Thermopolis, the rain falls for 9.4 days. Throughout September, 0.91" (23mm) of precipitation is accumulated. In Thermopolis, during the entire year, the rain falls for 117.2 days and collects up to 11.14" (283mm) of precipitation.Snowfall
Months with snowfall in Thermopolis, Wyoming, are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.47" (12mm) of snow. In Thermopolis, during the entire year, snow falls for 51.2 days and aggregates up to 21.3" (541mm) of snow.Daylight
In September, the average length of the day in Thermopolis is 12h and 29min.On the first day of September in Thermopolis, sunrise is at 6:37 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:54 pm MDT.
Sunshine
In September, the average sunshine in Thermopolis is 10.7h.UV index
In Thermopolis, Wyoming, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The daily high UV index of 4 during September translates into the following recommendations:
Be vigilant - Suggestions to stave off sun damage are provided. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Thermopolis in September?
What is the average humidity in September in Thermopolis?
How many days does it rain in September in Thermopolis?
When does it start to snow in Thermopolis?
What is the average length of the day in September in Thermopolis?
What time are sunrise and sunset in September in Thermopolis?
How many hours of sunshine does Thermopolis have in September?
How high is the UV index in September in Thermopolis?
Average temperature in September
Thermopolis, WY
- Average high temperature in September: 73°F
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is December (28.2°F).
- Average low temperature in September: 52°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).
Average pressure in September
Thermopolis, WY
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Thermopolis, WY
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is January (5mph).
Average humidity in September
Thermopolis, WY
- Average humidity in September: 38%
The month with the highest relative humidity is January (81%).
The months with the lowest relative humidity are July and August (35%).
Average rainfall in September
Thermopolis, WY
- Average rainfall in September: 0.91"
The wettest month (with the highest rainfall) is May (1.93").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in September
Thermopolis, WY
- Average rainfall days in September: 9.4 days
The month with the highest number of rainy days is May (17 days).
The months with the least rainy days are January and December (4.3 days).
Average snowfall in September
Thermopolis, WY
- Average snowfall in September: 0.47"
The month with the highest snowfall is February (4.57").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Thermopolis, WY
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is February (11.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Thermopolis, 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 month with the least sunshine is February (Average sunshine: 6h and 12min).
Average sunshine days in September
Thermopolis, WY
- Average sunshine days in September: 17.3 days
The month with the most sunshine days is January (20.2 days).
The month with the least sunshine days is May (10.1 days).
Average UV index in September
Thermopolis, WY
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, April, November and December (UV index 2).
Average cloud cover in September
Thermopolis, WY
- Average cloud cover in September: 15
The month with the most cloud cover is February (Cloud cover 35).
The months with the least cloud cover are July and August (Cloud cover 14).
Average visibility in September
Thermopolis, WY
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Thermopolis, Wyoming, USA
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