Climate and monthly weather forecast
South Sioux City, NE

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The climate of South Sioux City

Designated within the Köppen climate classification as Dfa, South Sioux City, Nebraska, USA is characterised by a humid continental climate. There is no dry season and the city experiences hot summers. This geographically located city in the Midwestern United States presents conditions typified by substantial temperature variations throughout the year and an balanced distribution of annual rainfall.

Monthly average temperatures in South Sioux City range from a comfortable 13.5°F (-10.3°C) during the cooler months to a toasty 83.8°F (28.8°C) in the peak of the warmer season. Essential to note is the fluctuation in humidity, which presents a span from 67% in the dry periods to 83% in the more humid intervals. Rainfall also shows considerable variation, with monthly averages ranging from a light 0.39" (10mm) to a substantial 1.85" (47mm).

The most remarkable aspect of the region's climate is its unique weather patterns. For instance, despite its humid categorisation, South Sioux City does not experience precipitation throughout the year. Snowfall is observed from January through April, then reappears in late November and December, leaving five months free from snow. The most substantial downpour of rain is witnessed in June, followed by a considerable decrease in the ensuing months. This pattern is also reflected in the number of rainfall days, with June recording the peak and then a consistent decline noted from July to November.

The best time to visit South Sioux City

Ideal weather conditions are subjective and depend on personal comfort and preferences. However, conditions associated with moderate temperatures and lower precipitation are, to many, the epitome of perfect weather. South Sioux City offers such conditions from May to September when the average temperature hovers around a pleasant 70°F (21.1°C) to 80.1°F (26.7°C). Rainfall during these months is moderate to low, making this window of time particularly appealing.

Moreover, this period encompasses the lengthiest daylight hours, extending from 14.6 hours in May to a maximum of 15.3 hours in June before shrinking to 12.5 hours in September.

The worst time to visit South Sioux City

For those averse to colder weather, the first few months of the year would not represent the optimal time to visit South Sioux City. From January to April, the average temperature remains within 13.5°F (-10.3°C) to 58.6°F (14.8°C). Precipitation in the form of both rain and snow characterizes the weather during these months, with snowfall reaching 1.42" (36mm) in December and rainfall peaking at 1.57" (40mm) in April.

Spring weather in South Sioux City

The spring in South Sioux City, from March to May, is a time of transitional weather. Temperatures gradually rise to 70°F (21.1°C) by May from 31.1°F (-0.5°C) in March. During this period, the relative humidity decreases to 70% from 73% and there is an upward trend in rainfall, with May registering an average precipitation of 1.73" (44mm).

Summer weather in South Sioux City

The summertime, from June to August, is when South Sioux City experiences its highest temperatures and most substantial rainfall. Average temperatures peak at 83.8°F (28.8°C) in July, while humidity escalates to 76%. Rainfall is highest in June at 1.85" (47mm). Despite these trends, the city enjoys prolonged periods of sunlight, reaching up to 15.3 hours of daylight in June.

Autumn weather in South Sioux City

Autumn, from September through November, brings a gradual drop in temperature from 75.6°F (24.2°C) to 46.8°F (8.2°C). Concurrently, the city experiences a decrease in rainfall, humidity, and daylight hours. Going from 1.26" (32mm) of rainfall in September to only 0.47" (12mm) by November, and 12.5 hours of daylight in September to 9.8 hours by November.

Winter weather in South Sioux City

Winters in South Sioux City, from December to February, can be quite chilly with the average temperature hovering between 13.5°F (-10.3°C) to 31.1°F (-0.5°C). Snowfall is a common feature during these months, peaking at 1.42" (36mm) in December. However, despite the cold conditions, the city experiences surprisingly minimal rainfall during winter, ranging from 0.39" (10mm) to 0.59" (15mm).

Weather in January

South Sioux City's January weather can be recognized by its frosty grip, with an average high and low temperature of 27°F (-2.8°C) and 13.5°F (-10.3°C) respectively. The winter chill remains firmly entrenched, seldom spilling over into February, making it colder than December. Weather in January »

Weather in February

February brings a small, yet noticeable change from January, paving the way for an early spring atmosphere. It is still comfortably cool with top readings of 31.1°F (-0.5°C) and lows around 17.1°F (-8.3°C). The rapid growth in the daylight hours from 9.5 the previous month to 10.6 in February signals a transition. Weather in February »

Weather in March

March recounts the rhetoric of changing seasons in South Sioux City, hinting at the arrival of spring. The temperature increases to 46.8°F (8.2°C) during the day, and around night dips to 30.9°F (-0.6°C), a noticeable increase compared to February's cold days. Weather in March »

Weather in April

April ushers in a surge in South Sioux City's weather progression with a pollen-filled air characteristic of blooming spring. The city experiences an unmistakable hike in daytime temperatures from a high of 46.8°F (8.2°C) in March to 58.6°F (14.8°C) in April. Weather in April »

Weather in May

May brings a refreshing break from the past months and announces the onset of summer in South Sioux City. A rise occurs in daytime and nighttime temperatures, with highs and lows now reaching 70°F (21.1°C) and 52.5°F (11.4°C). The weather indicates a transformation into summer with increased daylight and reduced snowfall, a common theme for this time of the year. Weather in May »

Weather in June

South Sioux City experiences near-peak summer conditions in June, shedding the subtle cool winds of May. Daytime temperatures now reach 80.1°F (26.7°C), while nights provide respite with 62.6°F (17°C). The overall weather promotes engaging outdoor activities and celebrations, symbolizing the start of summer holidays. Weather in June »

Weather in July

South Sioux City in July displays central summer weather in its full bloom. The mercury reaching a peak of 83.8°F (28.8°C) and a low of 64.9°F (18.3°C) makes July the hottest month of the year. South Sioux City relishes the heat with outdoor festivals and pool parties taking center stage. Weather in July »

Weather in August

August in South Sioux City presents near-identical climatic conditions to July, with a mild decrease in temperatures. High temperatures mark around 81.9°F (27.7°C) alongside lows of 61.5°F (16.4°C). Despite being summer’s final stretch, the weather remains predominantly warm. Weather in August »

Weather in September

September sees a subtle shift in South Sioux City's weather from glaring summer to welcoming fall season. Notable is a drop in daytime temperatures, now averaging 75.6°F (24.2°C). While the weather remains moderately hot, the clear blue skies against the backdrop of burnt-orange leaves begin to transform the landscape. Weather in September »

Weather in October

The sweeping autumnal change continues to fashion South Sioux City's weather in October. From high temperatures around 59.9°F (15.5°C), a move toward winter characterizes the month. The progressive change from daylight of 12.5 hours in September to 11 hours in October makes it clear that winter is around the corner. Weather in October »

Weather in November

November's weather in South Sioux City reflects a stark shift towards the colder winter months ahead. Temperature highs and lows decrease further to 46.8°F (8.2°C) and 31.6°F (-0.2°C) respectively, marking a considerable drop from October. Weather in November »

Weather in December

Wrapping up the year, South Sioux City is under the full gear of winter during December. Freezing temperatures below 31.1°F (-0.5°C) during the day and a chilly 19°F (-7.2°C) at night confirm the arrival of peak winter. Despite the cold, South Sioux City gleams under the festive season, celebrating the holidays with gusto. Weather in December »
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Frequently asked questions

What are the coldest months in South Sioux City?

January is the month that records the lowest temperatures in South Sioux City, with averages ranging from a high of 27°F (-2.8°C) to a low of 13.5°F (-10.3°C).

What is the most humid month in South Sioux City?

The most humid month is January, with an average relative humidity of 83%.

What is the driest month in South Sioux City?

The months with the least rainfall are January and February Rain falls for 2.6 days and accumulates 0.39" (10mm) of rain.

How much does it rain in South Sioux City?

Throughout the year, in South Sioux City, there are 102.3 rainfall days, and 12.91" (328mm) of precipitation is accumulated.

When does it snow in South Sioux City?

Months with snowfall in South Sioux City, Nebraska, are January through April, October through December.

When does it snow the most in South Sioux City?

January is the month with the most snowfall. Snow falls for 8.2 days and accumulates 1.77" (45mm) of snow.

How many days does it snow in South Sioux City?

Throughout the year, there are 31.1 snowfall days, and 6.85" (174mm) of snow is accumulated.

What is the month with the least sunshine in South Sioux City?

January has the least sunshine of the year, with an average of 4.5h of sunshine.

When is the lowest UV index in South Sioux City?

With an average maximum UV index of 1, January is the month with the lowest UV index in South Sioux City, Nebraska.

When is Daylight Saving Time (DST) in South Sioux City?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in South Sioux City, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.

When it does not snow in South Sioux City?

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

What is the wettest month in South Sioux City?

June is the month with the most rainfall in South Sioux City, Nebraska. Rain falls for 14.6 days and accumulates 1.85" (47mm) of precipitation.

When are the longest days in South Sioux City?

June has the longest days of the year, with an average of 15h and 12min of daylight.

When is the highest UV index in South Sioux City?

The months with the highest UV index are June and July, with an average maximum UV index of 6.

What time of the year is the hottest in South Sioux City?

July, recording an average high temperature of 83.8°F (28.8°C) and a low temperature of 64.9°F (18.3°C), is South Sioux City's warmest month.

What month has the most sunshine in South Sioux City?

The month with the most sunshine in South Sioux City, Nebraska, is July, with an average of 10.7h of sunshine.

What is the least humid month in South Sioux City?

October is the least humid month in South Sioux City, Nebraska, with an average relative humidity of 65%.

What is the month with the shortest days in South Sioux City?

With an average of 9h and 6min of daylight, December has the shortest days of the year.

Average temperature
South Sioux City, NE

Average temperature - South Sioux City, NE

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).

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
South Sioux City, NE

Average pressure - South Sioux City, NE

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

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Average wind speed
South Sioux City, NE

Average wind speed - South Sioux City, NE

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
South Sioux City, NE

Average humidity - South Sioux City, NE

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
South Sioux City, NE

Average rainfall - South Sioux City, NE

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
South Sioux City, NE

Average rainfall days - South Sioux City, NE

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
South Sioux City, NE

Average snowfall - South Sioux City, NE

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

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Average snowfall days
South Sioux City, NE

Average snowfall days - South Sioux City, NE

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

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Average daylight / Average sunshine
South Sioux City, NE

Average daylight / Average sunshine - South Sioux City, NE

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).

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Average sunshine days
South Sioux City, NE

Average sunshine days - South Sioux City, NE

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 visibility
South Sioux City, NE

Average visibility - South Sioux City, NE

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

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South Sioux City, Nebraska, USA

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