Sioux City
Iowa, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Sioux City, IA

A high aerial view of the vast Sioux City, Iowa, complete with the river therein and a far view of the clear horizon, a few clouds in the sky
A high aerial view of the vast Sioux City, Iowa, complete with the river therein and a far view of the clear horizon, a few clouds in the sky
January, like December, is another subzero cold winter month in Sioux City, Iowa, with average temperature varying between 10.2°F (-12.1°C) and 30.6°F (-0.8°C). The coldest month is January, with an average high-temperature of 30.6°F (-0.8°C) and an average low-temperature of 10.2°F (-12.1°C). Weather in January »
The last month of the winter, February, is a cold month in Sioux City, Iowa, with temperature in the range of an average low of 15.3°F (-9.3°C) and an average high of 34.9°F (1.6°C). In February, the average high-temperature is almost the same as in January - a cold 34.9°F (1.6°C). Weather in February »

The first month of the spring, March, is a chilly month in Sioux City, Iowa, with average temperature varying between 47.5°F (8.6°C) and 25.5°F (-3.6°C). In March, the average high-temperature rises, from a wintry 34.9°F (1.6°C) in February, to a frosty 47.5°F (8.6°C). Weather in March »

April in Sioux City, Iowa, is a comfortable spring month, with average temperature fluctuating between 62.2°F (16.8°C) and 36.9°F (2.7°C). In Sioux City, the average high-temperature soars, from a frosty 47.5°F (8.6°C) in March, to an enjoyable 62.2°F (16.8°C). Weather in April »

May, the last month of the spring, in Sioux City, is a pleasant month, with average temperature fluctuating between 73°F (22.8°C) and 48.7°F (9.3°C). In May, the average high-temperature rises, from a comfortable 62.2°F (16.8°C) in April, to an agreeable 73°F (22.8°C). Weather in May »

The first month of the summer, June, is a moderately hot month in Sioux City, Iowa, with average temperature varying between 82°F (27.8°C) and 58.6°F (14.8°C). In June, the average high-temperature increases, from an agreeable 73°F (22.8°C) in May, to a warm 82°F (27.8°C). Weather in June »

July, the same as June, is a moderately hot summer month in Sioux City, Iowa, with temperature in the range of an average high of 85.5°F (29.7°C) and an average low of 63.1°F (17.3°C). The warmest month is July, with an average high-temperature of 85.5°F (29.7°C) and an average low-temperature of 63.1°F (17.3°C). Weather in July »

The last month of the summer, August, is another warm month in Sioux City, Iowa, with average temperature ranging between max 83.3°F (28.5°C) and min 61°F (16.1°C). In August, the average high-temperature is essentially the same as in July - a still moderately hot 83.3°F (28.5°C). Weather in August »

The first month of the autumn, September, is also a moderately hot month in Sioux City, Iowa, with average temperature ranging between min 50.5°F (10.3°C) and max 76.3°F (24.6°C). In Sioux City, the average high-temperature marginally drops, from 83.3°F (28.5°C) in August, to a still moderately hot 76.3°F (24.6°C). Weather in September »

October, like September, in Sioux City, Iowa, is another comfortable autumn month, with average temperature fluctuating between 63.3°F (17.4°C) and 37.9°F (3.3°C). In October, the average high-temperature decreases, from a warm 76.3°F (24.6°C) in September, to an enjoyable 63.3°F (17.4°C). Weather in October »

November, the last month of the autumn, in Sioux City, is another chilly month, with average temperature ranging between max 46.4°F (8°C) and min 25.2°F (-3.8°C). In November, the average high-temperature declines considerably, from a comfortable 63.3°F (17.4°C) in October, to a frosty 46.4°F (8°C). Weather in November »

The first month of the winter, December, is also a wintry month in Sioux City, Iowa, with average temperature ranging between min 12.9°F (-10.6°C) and max 32.2°F (0.1°C). In Sioux City, the average high-temperature decreases, from a chilly 46.4°F (8°C) in November, to a cold 32.2°F (0.1°C). Weather in December »

What is the coldest month in Sioux City?

January is the coldest month, with an average high-temperature of 30.6°F (-0.8°C) and an average low-temperature of 10.2°F (-12.1°C).

How much does it rain in Sioux City?

In Sioux City, Iowa, during the entire year, the rain falls for 100.9 days and collects up to 27.7" (704.5mm) of precipitation.

What is the driest month in Sioux City?

The month with the least rainfall is January when the rain falls for 6.3 days and typically collects 0.6" (15.7mm) of precipitation.

When does it snow in Sioux City?

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

How much does it snow in Sioux City?

Throughout the year, there are 25.5 snowfall days, and 34.8" (883.9mm) of snow is accumulated.

What are the months with the lowest UV index in Sioux City?

Months with the lowest UV index are January and December, with an average maximum UV index of 1.

What is the least humid month in Sioux City?

The least humid month is April, with an average relative humidity of 61.6%.

What is the rainiest month in Sioux City?

The month with the most rainfall in Sioux City, Iowa, is June when the rain falls for 10.9 days and typically aggregates up to 3.9" (98.8mm) of precipitation.

When are the longest days in Sioux City?

June has the longest days of the year in Sioux City, Iowa, with an average of 15.3h of daylight.

What are the months with the highest UV index in Sioux City?

June and July, with an average maximum UV index of 9, are months with the highest UV index in Sioux City.

What is the warmest month in Sioux City?

The warmest month is July, with an average high-temperature of 85.5°F (29.7°C) and an average low-temperature of 63.1°F (17.3°C).

What month has the most sunshine in Sioux City?

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

What is the most humid month in Sioux City?

With an average relative humidity of 75.9%, December is the most humid month in Sioux City, Iowa.

When does it snow the most in Sioux City?

December is the month with the most snowfall. Snow falls for 5.7 days and accumulates 7.8" (198.1mm) of snow.

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 9.1h of daylight.

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

With an average of 4.5h of sunshine, December has the least sunshine of the year in Sioux City, Iowa.
Average temperature - Sioux City, IA
Average humidity - Sioux City, IA

The month with the highest relative humidity is December (75.9%).
The month with the lowest relative humidity is April (61.6%).

Average rainfall - Sioux City, IA
Average rainfall days - Sioux City, IA

The month with the highest number of rainy days is May (11.3 days).
The month with the lowest number of rainy days is February (6 days).

Average snowfall - Sioux City, IA
Average snowfall days - Sioux City, IA

The month with the highest number of snowfall days is January (5.9 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

Average daylight / Average sunshine - Sioux City, IA