September weather forecastShell Lake, WI
September
Weather in September
September, the first month of the autumn in Shell Lake, is still a pleasant month, with an average temperature fluctuating between 68.9°F (20.5°C) and 49.8°F (9.9°C).Temperature
Shell Lake records a mild change in average high-temperature during September, easing from a warm 77°F (25°C) in August to an agreeable 68.9°F (20.5°C). Shell Lake records an average nighttime low-temperature of 49.8°F (9.9°C) throughout September.Humidity
In Shell Lake, the average relative humidity in September is 78%.Rainfall
In Shell Lake, Wisconsin, in September, during 12.5 rainfall days, 1.69" (43mm) of precipitation is typically accumulated. Throughout the year, in Shell Lake, there are 118.5 rainfall days, and 21.1" (536mm) of precipitation is accumulated.Snowfall
In Shell Lake, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 31min.On the first day of September in Shell Lake, Wisconsin, sunrise is at 6:29 am and sunset at 7:45 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:49 pm CDT.
Sunshine
In September, the average sunshine in Shell Lake is 8.4h.UV index
In September, the average daily maximum UV index in Shell Lake is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 4 during September translates into the following guidance:
Act with care - Obligation to protect against skin and eye damage is highlighted. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Shell Lake, WI
- Average high temperature in September: 68.9°F
The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (17.4°F).
- Average low temperature in September: 49.8°F
The month with the highest average low temperature is July (59°F).
The coldest month (with the lowest average low temperature) is January (4.8°F).
Average pressure in September
Shell Lake, WI
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is February (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Shell Lake, WI
- Average wind speed in September: 7.6mph
The windiest month (with the highest average wind speed) is April (8.8mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in September
Shell Lake, WI
- Average humidity in September: 78%
The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is May (73%).
Average rainfall in September
Shell Lake, WI
- Average rainfall in September: 1.69"
The wettest month (with the highest rainfall) is June (3.15").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days in September
Shell Lake, WI
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is June (15.8 days).
The month with the least rainy days is January (2.4 days).
Average snowfall in September
Shell Lake, WI
- Average snowfall in September: 0"
The month with the highest snowfall is December (6.42").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Shell Lake, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Shell Lake, 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: 8h and 24min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 2h and 36min).
Average sunshine days in September
Shell Lake, WI
- Average sunshine days in September: 15.9 days
The month with the most sunshine days is December (16.9 days).
The month with the least sunshine days is June (11.4 days).
Average UV index in September
Shell Lake, WI
- 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, November and December (UV index 1).
Average cloud cover in September
Shell Lake, WI
- Average cloud cover in September: 39
The month with the most cloud cover is January (Cloud cover 74).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in September
Shell Lake, WI
- Average visibility in September: 5mi
The months with the highest visibility are April, May, June, July and October (6mi).
The months with the lowest visibility are January and February (4mi).
