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
The commencement of September involves a temperature shift, with the average high-temperature dropping from a warm 76.5°F (24.7°C) in August to an enjoyable 66.6°F (19.2°C). A striking difference from the daytime highs is registered during September nights in Etna, Wyoming, with an average temperature of 40.1°F (4.5°C).Humidity
In Etna, the average relative humidity in September is 53%.Rainfall
In Etna, in September, it is raining for 11.1 days, with typically 1.46" (37mm) of accumulated precipitation. Throughout the year, in Etna, there are 127 rainfall days, and 24.29" (617mm) of precipitation is accumulated.Snowfall
Months with snowfall in Etna, Wyoming, are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 0.5 snowfall days, it receives 0.47" (12mm) of snow. Throughout the year, there are 126.6 snowfall days, and 110.28" (2801mm) of snow is accumulated.Daylight
In Etna, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:49 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 7:06 pm MDT.
Sunshine
In Etna, the average sunshine in September is 10.1h.UV index
The average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: A daily maximum UV index of 3 in September translates into the following instructions:
Be vigilant - Suggestions to stave off sun damage are provided. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Be alert! Nearly double the UV rays 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 Etna in September?
What is the average humidity in September in Etna?
How many days does it rain in September in Etna?
When does it start to snow in Etna?
What is the average length of the day in September in Etna?
When is the sunrise / sunset in September in Etna?
How long on average sun shines in September in Etna?
What is the UV index reading in September in Etna?
Average temperature in September
Etna, WY
- Average high temperature in September: 66.6°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is December (24.3°F).
- Average low temperature in September: 40.1°F
The months with the highest average low temperature are July and August (45.3°F).
The coldest month (with the lowest average low temperature) is January (7.3°F).
Average pressure in September
Etna, WY
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.28"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Etna, WY
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is June (5.7mph).
The calmest month (with the lowest average wind speed) is January (4.3mph).
Average humidity in September
Etna, WY
- Average humidity in September: 53%
The month with the highest relative humidity is February (94%).
The month with the lowest relative humidity is August (46%).
Average rainfall in September
Etna, WY
- Average rainfall in September: 1.46"
The wettest month (with the highest rainfall) is February (2.91").
The driest month (with the least rainfall) is July (0.91").
Average rainfall days in September
Etna, WY
- Average rainfall days in September: 11.1 days
The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is January (4.6 days).
Average snowfall in September
Etna, WY
- Average snowfall in September: 0.47"
The month with the highest snowfall is February (22.91").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Etna, WY
- Average snowfall days in September: 0.5 days
The months with the highest number of snowfall days are February and December (22.3 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Etna, WY
- Average daylight in September: 12h and 3min
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 1min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 4h and 0min).
Average sunshine days in September
Etna, WY
- Average sunshine days in September: 16.2 days
The month with the most sunshine days is September (16.2 days).
The month with the least sunshine days is April (5.3 days).
Average UV index in September
Etna, 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, November and December (UV index 1).
Average cloud cover in September
Etna, WY
- Average cloud cover in September: 18
The month with the most cloud cover is February (Cloud cover 67).
The months with the least cloud cover are July and August (Cloud cover 13).
Average visibility in September
Etna, WY
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (3mi).
Etna, Wyoming, USA
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