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 another subzero cold winter month in Sioux City, Iowa, with an average temperature fluctuating between 27°F (-2.8°C) and 13.5°F (-10.3°C). With an average high-temperature of 27°F (-2.8°C) and an average low-temperature of 13.5°F (-10.3°C), January is the coldest month. 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 varying between 31.1°F (-0.5°C) and 17.1°F (-8.3°C). In February, the average high-temperature is relatively the same as in January - a still freezing 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 an average temperature ranging between min 30.9°F (-0.6°C) and max 46.8°F (8.2°C). In Sioux City, the average high-temperature in March significantly increases from a freezing cold 31.1°F (-0.5°C) in February to a chilly 46.8°F (8.2°C). Weather in March »

Weather in April

April in Sioux City, Iowa, is a moderate spring month, with temperature in the range of an average low of 41.5°F (5.3°C) and an average high of 58.6°F (14.8°C). In April, the average high-temperature increases from a chilly 46.8°F (8.2°C) in March to a moderate 58.6°F (14.8°C). Weather in April »

Weather in May

The last month of the spring, May, is an agreeable month in Sioux City, Iowa, with an average temperature ranging between max 70°F (21.1°C) and min 52.5°F (11.4°C). In Sioux City, the average high-temperature in May rises from a moderate 58.6°F (14.8°C) in April to a pleasant 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 an average temperature fluctuating between 80.1°F (26.7°C) and 62.6°F (17°C). In June, the average high-temperature increases from an agreeable 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 temperature in the range of an average low of 64.9°F (18.3°C) and an average high of 83.8°F (28.8°C). With an average high-temperature of 83.8°F (28.8°C) and an average low-temperature of 64.9°F (18.3°C), July is the warmest month. In July, the average heat index is calculated to be a tropical 91.4°F (33°C). Weather in July »

Weather in August

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

Weather in September

The first month of the autumn, September, is still a warm month in Sioux City, Iowa, with temperature in the range of an average high of 75.6°F (24.2°C) and an average low of 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 a moderate autumn month, with an average temperature varying 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

The last month of the autumn, November, is also a frosty month in Sioux City, Iowa, with an average temperature fluctuating between 31.6°F (-0.2°C) and 46.8°F (8.2°C). In November, the average high-temperature drops from a mild 59.9°F (15.5°C) in October to a frosty 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 an average temperature fluctuating between 19°F (-7.2°C) and 31.1°F (-0.5°C). In Sioux City, the average high-temperature in December plummets from a frosty 46.8°F (8.2°C) in November to a freezing cold 31.1°F (-0.5°C). Weather in December »
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FAQ

What is the coldest month in Sioux City?

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

What is the most humid month in Sioux City?

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

What is the driest month in Sioux City?

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

How much does it rain in Sioux City?

In Sioux City, Iowa, 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?

January through April, October through December are months with snowfall in Sioux City, Iowa.

What is the snowiest month in Sioux City?

The month with the most snowfall in Sioux City 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, 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 in Sioux City, Iowa.

When is the lowest UV index in Sioux City?

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

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

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts, 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 rainiest month in Sioux City?

The month with the most rainfall in Sioux City 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?

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

When is the highest UV index in Sioux City?

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

What is the warmest month in Sioux City?

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).

What month has the most sunshine in Sioux City?

July has the most sunshine of the year, 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 in Sioux City, Iowa, 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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