September weather forecastThree Lakes, WI
September
Weather in September
September announces the arrival of fall in Three Lakes, Wisconsin, bringing clear skies and mild temperatures. A significant reduction in average high temperature to 66.7°F (19.3°C) from 74.5°F (23.6°C) in August signifies this change. The city begins to shed its summer greenery, slowly replacing it with the characteristic fall oranges and yellows. With the gradual fall temperatures, the city braces itself for the cooler temperatures and increase in rainfall expected in October.Temperature
The arrival of September correlates with a minor temperature reduction, down from August's warm 74.5°F (23.6°C) to a comfortable 66.7°F (19.3°C). In Three Lakes, the expected average low-temperature for September is a chilly 48°F (8.9°C).Humidity
In Three Lakes, the average relative humidity in September is 80%.Rainfall
In Three Lakes, in September, it is raining for 12.1 days, with typically 1.57" (40mm) of accumulated 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
The average length of the day in September in Three Lakes is 12h and 31min.On the first day of the month, sunrise is at 6:18 am and sunset at 7:34 pm. On the last day of September, sunrise is at 6:54 am and sunset at 6:38 pm CDT.
Sunshine
In September, the average sunshine is 7.6h.UV index
In Three Lakes, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: A maximum high UV index of 3 in September translates into the following recommendations:
Undertake precautions - It is suggested to shield oneself from sunburn. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Three Lakes, 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
Three Lakes, 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
Three Lakes, 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
Three Lakes, 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
Three Lakes, 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
Three Lakes, 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
Three Lakes, 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
Three Lakes, 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
Three Lakes, 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
Three Lakes, 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
Three Lakes, 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
Three Lakes, 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
Three Lakes, 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).
