Climate and monthly weather forecast
Sioux City, IA

Panorama of the vast Sioux City, Iowa
Panorama of the vast Sioux City, Iowa

Weather in January

January, like December, is a freezing cold winter month in Sioux City, Iowa, with an average temperature varying between 27°F (-2.8°C) and 13.5°F (-10.3°C). January is the coldest month, with an average high-temperature of 27°F (-2.8°C) and an average low-temperature of 13.5°F (-10.3°C). Weather in January »

Weather in February

The last month of the winter, February, is also a subzero cold month in Sioux City, Iowa, with an average temperature fluctuating between 31.1°F (-0.5°C) and 17.1°F (-8.3°C). In February, the average high-temperature is almost the same as in January - a still subzero cold 31.1°F (-0.5°C). Weather in February »

Weather in March

March, the first month of the spring in Sioux City, is a chilly month, with temperature in the range of an average low of 30.9°F (-0.6°C) and an average high of 46.8°F (8.2°C). In March, the average high-temperature increases considerably from a subzero cold 31.1°F (-0.5°C) in February to a frosty 46.8°F (8.2°C). Weather in March »

Weather in April

April in Sioux City, Iowa, is a moderate spring month, with an average temperature fluctuating between 41.5°F (5.3°C) and 58.6°F (14.8°C). In April, the average high-temperature rises from a frosty 46.8°F (8.2°C) in March to a mild 58.6°F (14.8°C). Weather in April »

Weather in May

May, the last month of the spring in Sioux City, is an agreeable month, with temperature in the range of an average high of 70°F (21.1°C) and an average low of 52.5°F (11.4°C). In May, the average high-temperature increases from a mild 58.6°F (14.8°C) in April to an agreeable 70°F (21.1°C). Weather in May »

Weather in June

June, the first month of the summer in Sioux City, is a warm month, with temperature in the range of an average high of 80.1°F (26.7°C) and an average low of 62.6°F (17°C). In Sioux City, Iowa, the average high-temperature in June increases from a pleasant 70°F (21.1°C) in May to a warm 80.1°F (26.7°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Sioux City, Iowa, with an average temperature ranging between max 83.8°F (28.8°C) and min 64.9°F (18.3°C). July is the warmest month, with an average high-temperature of 83.8°F (28.8°C) and an average low-temperature of 64.9°F (18.3°C). The average heat index in July is estimated at a hot 92.1°F (33.4°C). Weather in July »

Weather in August

August, the last month of the summer in Sioux City, is also a moderately hot month, with an average temperature fluctuating between 61.5°F (16.4°C) and 81.9°F (27.7°C). In August, the average high-temperature is practically the same as in July - a still warm 81.9°F (27.7°C). Weather in August »

Weather in September

September, the first month of the autumn in Sioux City, is still a warm month, with an average temperature ranging between max 75.6°F (24.2°C) and min 55.4°F (13°C). In September, the average high-temperature marginally drops from 81.9°F (27.7°C) in August to a still moderately hot 75.6°F (24.2°C). Weather in September »

Weather in October

October, the same as September, in Sioux City, Iowa, is another mild autumn month, with an average temperature fluctuating between 59.9°F (15.5°C) and 43.5°F (6.4°C). In Sioux City, the average high-temperature in October plummets from a moderately hot 75.6°F (24.2°C) in September to a mild 59.9°F (15.5°C). Weather in October »

Weather in November

November, the last month of the autumn in Sioux City, is another chilly month, with an average temperature varying between 46.8°F (8.2°C) and 31.6°F (-0.2°C). In Sioux City, the average high-temperature in November decreases from a mild 59.9°F (15.5°C) in October to a chilly 46.8°F (8.2°C). Weather in November »

Weather in December

December, the first month of the winter in Sioux City, is also a subzero cold month, with temperature in the range of an average high of 31.1°F (-0.5°C) and an average low of 19°F (-7.2°C). In December, the average high-temperature declines considerably from a frosty 46.8°F (8.2°C) in November to a subzero cold 31.1°F (-0.5°C). Weather in December »
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FAQ

What is the coldest month in Sioux City?

The coldest month in Sioux City is January, with an average high-temperature of 27°F (-2.8°C) and an average low-temperature of 13.5°F (-10.3°C).

What is the most humid month in Sioux City?

With an average relative humidity of 83%, January is the most humid month.

What is the driest month in Sioux City?

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

How many days does it rain in Sioux City?

In Sioux City, during the entire year, the rain falls for 102.3 days and collects up to 12.91" (328mm) of precipitation.

When does it snow in Sioux City?

Months with snowfall are January through April, October through December.

What is the snowiest month in Sioux City?

The month with the most snowfall in Sioux City, Iowa, is January, when snow falls for 8.2 days and typically aggregates up to 1.77" (45mm) of snow.

How much does it snow in Sioux City?

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

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

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

What is the month with the lowest UV index in Sioux City?

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

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

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in Sioux City, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from CDT to CST.

When it does not snow in Sioux City?

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

What is the wettest month in Sioux City?

The month with the most rainfall is June, when the rain falls for 14.6 days and typically aggregates up to 1.85" (47mm) of precipitation.

When are the longest days in Sioux City?

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

When is the highest UV index in Sioux City?

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

What is the warmest month in Sioux City?

The warmest month is July, with an average high-temperature of 83.8°F (28.8°C) and an average low-temperature of 64.9°F (18.3°C).

What month has the most sunshine in Sioux City?

July has the most sunshine of the year in Sioux City, Iowa, with an average of 10.7h of sunshine.

What is the least humid month in Sioux City?

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

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

December has the shortest days of the year, with an average of 9h and 8min of daylight.

Average temperature
Sioux City, IA

Average temperature - Sioux City, IA

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
Sioux City, IA

Average pressure - Sioux City, IA

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
Sioux City, IA

Average wind speed - Sioux City, IA

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 rainfall
Sioux City, IA

Average rainfall - Sioux City, IA

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
Sioux City, IA

Average rainfall days - Sioux City, IA

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
Sioux City, IA

Average snowfall - Sioux City, IA

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
Sioux City, IA

Average snowfall days - Sioux City, IA

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
Sioux City, IA

Average daylight / Average sunshine - Sioux City, IA

The month with the longest days is June (Average daylight: 15h and 15min).
The month with the shortest days is December (Average daylight: 9h and 8min).

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
Sioux City, IA

Average sunshine days - Sioux City, IA

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
Sioux City, IA

Average visibility - Sioux City, IA

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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