September weather forecastSuperior, WI
September
Weather in September
September welcomes the arrival of fall in Superior with a noticeable decrease in temperature. A decrease in humidity differentiates it from preceding months, delivering a fresh, crisp quality to the air. Colorful fall foliage starts to appear, transforming the landscape into a multi-colored canvas. The noticeable chill in the evening gives a hint of the approaching winter. Meanwhile, the cityara reaps the last of summer's bounty, marking the end of a vibrant season.Temperature
With September's arrival, Superior's weather changes as the average high-temperature falls from a moderately hot 76.3°F (24.6°C) in August to a comfortable 67.1°F (19.5°C). Superior encounters an average low-temperature of 49.5°F (9.7°C) during September nights.Humidity
In Superior, the average relative humidity in September is 78%.Rainfall
In September, the rain falls for 6.2 days. Throughout September, 0.35" (9mm) of precipitation is accumulated. In Superior, during the entire year, the rain falls for 55.7 days and collects up to 4.33" (110mm) of precipitation.Snowfall
In Superior, snow does not fall in June through September.Daylight
In Superior, the average length of the day in September is 12h and 32min.On the first day of September, sunrise is at 6:29 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 6:49 pm CDT.
Sunshine
In September, the average sunshine is 8.2h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: In September, an average UV index of 4 transforms into the following instructions:
Guard yourself - Avoiding sunburn is suggested. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Superior, WI
- Average high temperature in September: 67.1°F
The warmest month (with the highest average high temperature) is July (77.7°F).
The month with the lowest average high temperature is January (17.1°F).
- Average low temperature in September: 49.5°F
The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is January (4.1°F).
Average pressure in September
Superior, WI
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is February (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Superior, WI
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is April (8.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity in September
Superior, WI
- Average humidity in September: 78%
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is May (72%).
Average rainfall in September
Superior, WI
- Average rainfall in September: 0.35"
The wettest month (with the highest rainfall) is July (0.67").
The driest months (with the least rainfall) are January and February (0.16").
Average rainfall days in September
Superior, WI
- Average rainfall days in September: 6.2 days
The month with the highest number of rainy days is May (7.9 days).
The month with the least rainy days is February (0.5 days).
Average snowfall in September
Superior, WI
- Average snowfall in September: 0"
The month with the highest snowfall is December (0.98").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Superior, WI
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and December (9.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Superior, WI
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 8h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).
Average sunshine days in September
Superior, WI
- Average sunshine days in September: 21.9 days
The month with the most sunshine days is January (25.7 days).
The month with the least sunshine days is April (19.9 days).
Average UV index in September
Superior, 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, February, November and December (UV index 1).
Average cloud cover in September
Superior, WI
- Average cloud cover in September: 40
The month with the most cloud cover is January (Cloud cover 72).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in September
Superior, WI
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
