September weather forecast
Superior, WI

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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.
Updated: Jun 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Superior in September?

An average high-temperature, in September, in Superior, is 67.1°F (19.5°C) and the average low-temperature is 49.5°F (9.7°C).

What is the average humidity in September?

In Superior, Wisconsin, the average relative humidity in September is 78%.

How much does it rain in September?

In Superior, in September, during 6.2 rainfall days, 0.35" (9mm) of precipitation is typically accumulated.

When it does not snow?

June through September are months without snowfall.

Does it snow in September?

In Superior, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September?

In September, the average day length is 12h and 32min.

When is the sunrise / sunset in September?

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.

How long on average sun shines in September?

In Superior, Wisconsin, the average sunshine duration in September is 8.2h.

What is the UV index reading in September?

In Superior, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Superior, WI

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / Average sunshine in September - Superior, WI
  • Average daylight in September: 12h and 3min

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 1min

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 - 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 - 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 - 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 - 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).

Superior, Wisconsin, USA

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