September weather forecast
South Sioux City, NE

Weather in September

September, the first month of the autumn, in South Sioux City, is also a moderately hot month, with average temperature ranging between min 55.4°F (13°C) and max 75.6°F (24.2°C).

Temperature

In South Sioux City, the average high-temperature marginally drops, from a moderately hot 81.9°F (27.7°C) in August, to a still warm 75.6°F (24.2°C). In September, in South Sioux City, the average low-temperature is 55.4°F (13°C).

Humidity

In South Sioux City, Nebraska, the average relative humidity is 71%.

Rainfall

In South Sioux City, it is raining for 9.7 days, with typically 1.26" (32mm) of accumulated precipitation. In South Sioux City, Nebraska, during the entire year, the rain falls for 102.3 days and collects up to 12.91" (328mm) of precipitation.

Snowfall

May through September are months without snowfall in South Sioux City.

Daylight

The average length of the day in South Sioux City is 12.5h.

Sunshine

In September, the average sunshine is 8.9h.

UV index

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the average humidity in September in South Sioux City?

In South Sioux City, Nebraska, the average relative humidity in September is 71%.

How many days does it rain in September in South Sioux City?

In South Sioux City, in September, during 9.7 rainfall days, 1.26" (32mm) of precipitation is typically accumulated.

When it does not snow in South Sioux City?

In South Sioux City, Nebraska, snow does not fall in May through September.

Does it snow in South Sioux City in September?

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

What is the average length of the day in September in South Sioux City?

In South Sioux City, the average length of the day in September is 12.5h.

How long on average sun shines in September in South Sioux City?

The average sunshine in September is 8.9h.

What is the UV index reading in September in South Sioux City?

The average daily maximum UV index in September in South Sioux City is 4. A UV Index of 3 to 5 symbolizes a moderate health threat from unprotected exposure to the UV radiation.

Average temperature in September
South Sioux City, NE

Average temperature in September - South Sioux City, NE
  • Average high temperature in September: 75.6°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (27°F).

  • Average low temperature in September: 55.4°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).

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Average pressure in September
South Sioux City, NE

Average pressure in September - South Sioux City, NE
  • Average pressure in September: 29.99"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.86").

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Average wind speed in September
South Sioux City, NE

Average wind speed in September - South Sioux City, NE
  • Average wind speed in September: 8.9mph

The windiest month (with the highest average wind speed) is April (11mph).
The calmest month (with the lowest average wind speed) is July (7.5mph).

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Average humidity in September
South Sioux City, NE

Average humidity in September - South Sioux City, NE
  • Average humidity in September: 71%

The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is October (65%).

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Average rainfall in September
South Sioux City, NE

Average rainfall in September - South Sioux City, NE
  • Average rainfall in September: 1.26"

The wettest month (with the highest rainfall) is June (1.85").
The driest months (with the least rainfall) are January and February (0.39").

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Average rainfall days in September
South Sioux City, NE

Average rainfall days in September - South Sioux City, NE
  • Average rainfall days in September: 9.7 days

The month with the highest number of rainy days is June (14.6 days).
The month with the least rainy days is January (2.6 days).

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Average snowfall in September
South Sioux City, NE

Average snowfall in September - South Sioux City, NE
  • Average snowfall in September: 0"

The month with the highest snowfall is January (1.77").
Months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
South Sioux City, NE

Average snowfall days in September - South Sioux City, NE
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (8.2 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
South Sioux City, NE

Average daylight in September / Average sunshine in September - South Sioux City, NE
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.3h).
The month with the shortest days is December (Average daylight: 9.1h).

  • Average sunshine in September: 8.9h

The month with the most sunshine is July (Average sunshine: 10.7h).
The month with the least sunshine is January (Average sunshine: 4.5h).

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Average sunshine days in September
South Sioux City, NE

Average sunshine days in September - South Sioux City, NE
  • Average sunshine days in September: 17.5 days

The month with the most sunshine days is January (22.6 days).
The month with the least sunshine days is June (13.1 days).

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Average UV index in September
South Sioux City, NE

Average UV index in September - South Sioux City, NE
  • Average UV index in September: 4

Months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).

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Average cloud cover in September
South Sioux City, NE

Average cloud cover in September - South Sioux City, NE
  • Average cloud cover in September: 29

The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 25).

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Average visibility in September
South Sioux City, NE

Average visibility in September - South Sioux City, NE
  • Average visibility in September: 6mi

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

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