September weather forecast
Sioux, WI

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Weather in September

The first month of the autumn, September, is also an enjoyable month in Sioux, Wisconsin, with an average temperature ranging between max 65.3°F (18.5°C) and min 52.5°F (11.4°C).

Temperature

With the onset of September, Sioux's average high-temperature slightly adjusts, moderately receding from August's pleasant 72.5°F (22.5°C) to a refreshing 65.3°F (18.5°C). During the month of September, an average temperature of 52.5°F (11.4°C) is noted during the nights.

Humidity

The average relative humidity in September is 78%.

Rainfall

In Sioux, in September, it is raining for 12.5 days, with typically 1.77" (45mm) of accumulated precipitation. In Sioux, during the entire year, the rain falls for 127.9 days and collects up to 22.56" (573mm) of precipitation.

Snowfall

June through September are months without snowfall in Sioux.

Daylight

In September, the average length of the day in Sioux, Wisconsin, is 12h and 32min.
On the first day of September, sunrise is at 6:24 am and sunset at 7:42 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:44 pm CDT.

Sunshine

In Sioux, the average sunshine in September is 8.9h.

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for average individuals.
Note: The maximum UV index of 4 during September leads to these instructions:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.

Frequently asked questions

What are the temperatures in September?

In September, in Sioux, the average high-temperature is 65.3°F (18.5°C), and the average low-temperature is 52.5°F (11.4°C).

What is the average humidity in September?

The average relative humidity in September is 78%.

How much does it rain in September?

In September, in Sioux, the rain falls for 12.5 days. Throughout September, 1.77" (45mm) of precipitation is accumulated.

When it does not snow?

June through September are months without snowfall.

Does it snow in September?

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

How many hours of daylight does Sioux have in September?

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

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:24 am and sunset at 7:42 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:44 pm CDT.

How long on average sun shines in September?

In September, the average sunshine duration is 8.9h.

What is the UV index intensity in September?

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's 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
Sioux, WI

Average temperature in September - Sioux, WI
  • Average high temperature in September: 65.3°F

The warmest month (with the highest average high temperature) is August (72.5°F).
The month with the lowest average high temperature is January (20.3°F).

  • Average low temperature in September: 52.5°F

The month with the highest average low temperature is August (57.9°F).
The coldest month (with the lowest average low temperature) is January (10.8°F).

Average pressure in September
Sioux, WI

Average pressure in September - Sioux, WI
  • Average pressure in September: 30"Hg

The month with the highest atmospheric pressure is February (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

Average wind speed in September
Sioux, WI

Average wind speed in September - Sioux, WI
  • Average wind speed in September: 8.7mph

The windiest months (with the highest average wind speed) are January and December (10.6mph).
The calmest month (with the lowest average wind speed) is July (6.9mph).

Average humidity in September
Sioux, WI

Average humidity in September - Sioux, WI
  • Average humidity in September: 78%

The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is May (75%).

Average rainfall in September
Sioux, WI

Average rainfall in September - Sioux, WI
  • Average rainfall in September: 1.77"

The wettest months (with the highest rainfall) are May and July (2.56").
The driest months (with the least rainfall) are January and February (1.06").

Average rainfall days in September
Sioux, WI

Average rainfall days in September - Sioux, WI
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is June (15.9 days).
The month with the least rainy days is February (3.6 days).

Average snowfall in September
Sioux, WI

Average snowfall in September - Sioux, WI
  • Average snowfall in September: 0"

The month with the highest snowfall is January (6.85").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Sioux, WI

Average snowfall days in September - Sioux, WI
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (22.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Sioux, WI

Average daylight in September / Average sunshine in September - Sioux, 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 5min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 2h and 24min).

Average sunshine days in September
Sioux, WI

Average sunshine days in September - Sioux, WI
  • Average sunshine days in September: 15.1 days

The month with the most sunshine days is September (15.1 days).
The month with the least sunshine days is December (8.7 days).

Average UV index in September
Sioux, WI

Average UV index in September - Sioux, 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
Sioux, WI

Average cloud cover in September - Sioux, WI
  • Average cloud cover in September: 35

The month with the most cloud cover is January (Cloud cover 76).
The month with the least cloud cover is August (Cloud cover 29).

Average visibility in September
Sioux, WI

Average visibility in September - Sioux, WI
  • Average visibility in September: 6mi

The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).

Sioux, Wisconsin, USA

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