September weather forecastEagle River, WI
September
Weather in September
September beckons the arrival of fall in Eagle River, Wisconsin, replacing summer's heat with a pleasant and balmy climate. The temperatures start to taper down from the summer highs, replaced by soft whispers of the changing season. Green landscapes evolve into a myriad of earthy hues, as the trees begin shedding their foliage. The decrease in daylight, paralleled by an increase in cloud cover, gives ample signs of the impending winter. September's charm lies in the warm days balancing the cool evenings - a perfect illustration of a transitioning season.Temperature
September in Eagle River witnesses a gentle descent in average high-temperature, descending from August's warm 74.5°F (23.6°C) to a comfortable 66.7°F (19.3°C). Eagle River's average low-temperature is measured at a chilly 48°F (8.9°C) during September.Humidity
The average relative humidity in September in Eagle River is 80%.Rainfall
In Eagle River, during September, the rain falls for 12.1 days and regularly aggregates up to 1.57" (40mm) of precipitation. Throughout the year, there are 123.5 rainfall days, and 23.11" (587mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 31min.On the first day of September in Eagle River, sunrise is at 6:18 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:38 pm CDT.
Sunshine
The average sunshine in September in Eagle River is 7.6h.UV index
In Eagle River, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index, 3 during September, leads to the following recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Eagle River, WI
- Average high temperature in September: 66.7°F
The warmest month (with the highest average high temperature) is July (76.6°F).
The month with the lowest average high temperature is January (18.9°F).
- Average low temperature in September: 48°F
The month with the highest average low temperature is July (56.1°F).
The coldest month (with the lowest average low temperature) is January (7.9°F).
Average pressure in September
Eagle River, WI
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Eagle River, WI
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is November (8.6mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity in September
Eagle River, WI
- Average humidity in September: 80%
The months with the highest relative humidity are January and February (92%).
The month with the lowest relative humidity is May (71%).
Average rainfall in September
Eagle River, WI
- Average rainfall in September: 1.57"
The wettest months (with the highest rainfall) are April and May (2.64").
The driest month (with the least rainfall) is January (1.26").
Average rainfall days in September
Eagle River, WI
- Average rainfall days in September: 12.1 days
The month with the highest number of rainy days is June (15.8 days).
The month with the least rainy days is January (2.8 days).
Average snowfall in September
Eagle River, WI
- Average snowfall in September: 0"
The month with the highest snowfall is December (9.69").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Eagle River, WI
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (24.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Eagle River, WI
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 7h and 36min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The months with the least sunshine are January and February (Average sunshine: 2h and 0min).
Average sunshine days in September
Eagle River, WI
- Average sunshine days in September: 15 days
The month with the most sunshine days is September (15 days).
The month with the least sunshine days is February (6.4 days).
Average UV index in September
Eagle River, WI
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, March, November and December (UV index 1).
Average cloud cover in September
Eagle River, WI
- Average cloud cover in September: 46
The months with the most cloud cover are January and February (Cloud cover 82).
The month with the least cloud cover is July (Cloud cover 39).
Average visibility in September
Eagle River, WI
- Average visibility in September: 5mi
The months with the highest visibility are May and June (6mi).
The months with the lowest visibility are January, February and December (4mi).
