September weather forecastFarson, WY
September
Weather in September
September brings the arrival of fall, delivering a needed respite from the summer heat. A notable decrease in temperatures, with figures oscillating between 46.9°F (8.3°C) and 67.3°F (19.6°C), announce the initial inklings of cooler weather. The city experiences mild changes in weather conditions with more cloud cover, and occasional rainfall. September also signals the first wave of leaf color change, acknowledging the arrival of fall. While the city sees a decrease in daylight hours, the weather remains comfortable and inviting.Temperature
A shift in the average high-temperature occurs in September, reducing from a warm 76.6°F (24.8°C) in August to a refreshing 67.3°F (19.6°C). September sees the temperature falling to a mean low of 46.9°F (8.3°C).Humidity
In September, the average relative humidity is 40%.Rainfall
In Farson, Wyoming, in September, during 7.2 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. In Farson, during the entire year, the rain falls for 102.6 days and collects up to 10.75" (273mm) of precipitation.Snowfall
Months with snowfall in Farson are January through June, September through December. September is the first month it typically snows in Farson. Throughout September, in the average 0.6 snowfall days, it receives 0.31" (8mm) of snow. In Farson, during the entire year, snow falls for 86.8 days and aggregates up to 41.77" (1061mm) of snow.Daylight
In Farson, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:44 am and sunset at 7:50 pm. On the last day of September, sunrise is at 7:14 am and sunset at 7:00 pm MDT.
Sunshine
In September, the average sunshine is 10.7h.UV index
The average daily maximum UV index in September in Farson is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Heed the precautions - Suggestions to avoid sunburn are made. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. 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
Average temperature in September
Farson, WY
- Average high temperature in September: 67.3°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is December (23.9°F).
- Average low temperature in September: 46.9°F
The month with the highest average low temperature is July (55.2°F).
The coldest month (with the lowest average low temperature) is January (5.4°F).
Average pressure in September
Farson, WY
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Farson, WY
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is June (8.1mph).
The calmest month (with the lowest average wind speed) is December (5.8mph).
Average humidity in September
Farson, WY
- Average humidity in September: 40%
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is August (34%).
Average rainfall in September
Farson, WY
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is May (1.73").
The driest month (with the least rainfall) is August (0.51").
Average rainfall days in September
Farson, WY
- Average rainfall days in September: 7.2 days
The month with the highest number of rainy days is May (15.2 days).
The month with the least rainy days is January (5.5 days).
Average snowfall in September
Farson, WY
- Average snowfall in September: 0.31"
The month with the highest snowfall is February (7.32").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Farson, WY
- Average snowfall days in September: 0.6 days
The month with the highest number of snowfall days is March (15.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Farson, WY
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 10h and 42min
The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 6h and 18min).
Average sunshine days in September
Farson, WY
- Average sunshine days in September: 18.5 days
The month with the most sunshine days is January (19.8 days).
The month with the least sunshine days is May (9.7 days).
Average UV index in September
Farson, 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, October, November and December (UV index 2).
Average cloud cover in September
Farson, WY
- Average cloud cover in September: 13
The month with the most cloud cover is February (Cloud cover 39).
The month with the least cloud cover is August (Cloud cover 11).
Average visibility in September
Farson, WY
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and February (4mi).
