Monthly weather forecast and climate
Chicago, IL

The city of Chicago in Illinois on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street
The city of Chicago in Illinois on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street

Weather in January

January, the same as December, in Chicago, Illinois, is another subzero cold winter month, with temperature in the range of an average low of 20.7°F (-6.3°C) and an average high of 29.7°F (-1.3°C). With an average high-temperature of 29.7°F (-1.3°C) and an average low-temperature of 20.7°F (-6.3°C), January is the coldest month. Weather in January »

Weather in February

February, the last month of the winter, in Chicago, is a cold month, with average temperature ranging between max 32°F (0°C) and min 23°F (-5°C). In Chicago, the average high-temperature is relatively the same as in January - a wintry 32°F (0°C). Weather in February »

Weather in March

The first month of the spring, March, is still a cold month in Chicago, Illinois, with temperature in the range of an average high of 41.5°F (5.3°C) and an average low of 32.2°F (0.1°C). In March, the average high-temperature rises, from a cold 32°F (0°C) in February, to a still wintry 41.5°F (5.3°C). Weather in March »

Weather in April

April is a fresh spring month in Chicago, Illinois, with average temperature varying between 50.7°F (10.4°C) and 40.6°F (4.8°C). In Chicago, the average high-temperature rises, from a wintry 41.5°F (5.3°C) in March, to a fresh 50.7°F (10.4°C). Weather in April »

Weather in May

The last month of the spring, May, is a comfortable month in Chicago, Illinois, with average temperature ranging between max 61°F (16.1°C) and min 50.4°F (10.2°C). In May, the average high-temperature rises, from a fresh 50.7°F (10.4°C) in April, to a comfortable 61°F (16.1°C). Weather in May »

Weather in June

June, the first month of the summer, in Chicago, is an agreeable month, with average temperature ranging between max 70.5°F (21.4°C) and min 60.3°F (15.7°C). In Chicago, the average high-temperature in June rises, from a comfortable 61°F (16.1°C) in May, to an agreeable 70.5°F (21.4°C). Weather in June »

Weather in July

July is a warm summer month in Chicago, Illinois, with average temperature fluctuating between 77.4°F (25.2°C) and 67.8°F (19.9°C). In July, the average high-temperature slightly increases, from a pleasant 70.5°F (21.4°C) in June, to a warm 77.4°F (25.2°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Chicago, Illinois, with average temperature ranging between max 77.5°F (25.3°C) and min 67.6°F (19.8°C). With an average high-temperature of 77.5°F (25.3°C) and an average low-temperature of 67.6°F (19.8°C), August is the warmest month. Weather in August »

Weather in September

The first month of the autumn, September, is also an agreeable month in Chicago, Illinois, with average temperature ranging between max 71.1°F (21.7°C) and min 61.2°F (16.2°C). In Chicago, the average high-temperature slightly decreases, from a warm 77.5°F (25.3°C) in August, to an agreeable 71.1°F (21.7°C). Weather in September »

Weather in October

October, like September, is another mild autumn month in Chicago, Illinois, with temperature in the range of an average low of 48.9°F (9.4°C) and an average high of 59.5°F (15.3°C). In Chicago, the average high-temperature in October drops, from a pleasant 71.1°F (21.7°C) in September, to a moderate 59.5°F (15.3°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a frosty month in Chicago, Illinois, with average temperature ranging between min 36.5°F (2.5°C) and max 46°F (7.8°C). In Chicago, the average high-temperature drops, from a mild 59.5°F (15.3°C) in October, to a chilly 46°F (7.8°C). Weather in November »

Weather in December

The first month of the winter, December, is still a cold month in Chicago, Illinois, with average temperature varying between 27.9°F (-2.3°C) and 35.8°F (2.1°C). In Chicago, the average high-temperature in December drops, from a chilly 46°F (7.8°C) in November, to a cold 35.8°F (2.1°C). Weather in December »
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FAQ

What is the coldest month in Chicago?

With an average high-temperature of 29.7°F (-1.3°C) and an average low-temperature of 20.7°F (-6.3°C), January is the coldest month in Chicago, Illinois.

What is the most humid month in Chicago?

With an average relative humidity of 82%, January is the most humid month in Chicago.

How much does it rain in Chicago?

In Chicago, during the entire year, the rain falls for 160.2 days and collects up to 36.97" (939mm) of precipitation.

When does it snow in Chicago?

January through May, November and December are months with snowfall in Chicago.

How much does it snow in Chicago?

Throughout the year, there are 40.9 snowfall days, and 13.9" (353mm) of snow is accumulated.

What is the month with the least sunshine in Chicago?

January has the least sunshine of the year, with an average of 3.7h of sunshine.

What are the months with the lowest UV index in Chicago?

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

What is the snowiest month in Chicago?

The month with the most snowfall is February when snow falls for 9.9 days and typically aggregates up to 3.54" (90mm) of snow.

What month is the ocean coldest in Chicago?

The month with the coldest seawater in Chicago, Illinois, is February, with an average ocean temperature of 36.9°F (2.7°C).

What is the rainiest month in Chicago?

June is the month with the most rainfall in Chicago. Rain falls for 17.5 days and accumulates 4.88" (124mm) of precipitation.

When it does not snow in Chicago?

In Chicago, Illinois, snow does not fall in June through October.

When are the longest days in Chicago?

The month with the longest days in Chicago, Illinois, is June, with an average of 15.2h of daylight.

What are the months with the most sunshine in Chicago?

July and August, with an average of 10.6h of sunshine, are months with the most sunshine in Chicago, Illinois.

When is the highest UV index in Chicago?

July and August, with an average maximum UV index of 6, are months with the highest UV index in Chicago, Illinois.

What is the warmest month in Chicago?

The warmest month in Chicago is August, with an average high-temperature of 77.5°F (25.3°C) and an average low-temperature of 67.6°F (19.8°C).

What is the month with the warmest ocean in Chicago?

August is the month with the warmest seawater, with an average ocean temperature of 73.9°F (23.3°C).

What is the least humid month in Chicago?

With an average relative humidity of 73%, October is the least humid month.

What is the driest month in Chicago?

The month with the least rainfall is December when the rain falls for 8.8 days and typically collects 1.65" (42mm) of precipitation.

What is the month with the shortest days in Chicago?

With an average of 9.2h of daylight, December has the shortest days of the year.

Average pressure
Chicago, IL

Average pressure - Chicago, IL

The month with the highest atmospheric pressure is January (1019.5mbar).
The month with the lowest atmospheric pressure is June (1013.3mbar).

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Average wind speed
Chicago, IL

Average wind speed - Chicago, IL

The windiest month (with the highest average wind speed) is January (20.1km/h).
The calmest month (with the lowest average wind speed) is July (12.4km/h).

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Average rainfall
Chicago, IL

Average rainfall - Chicago, IL

The wettest month (with the highest rainfall) is June (124mm).
The driest month (with the least rainfall) is December (42mm).

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Average rainfall days
Chicago, IL

Average rainfall days - Chicago, IL

The month with the highest number of rainy days is July (18.5 days).
The month with the least rainy days is February (5.5 days).

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Average snowfall
Chicago, IL

Average snowfall - Chicago, IL

The month with the highest snowfall is February (90mm).
Months with the least snowfall are June, July, August, September and October (0mm).

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Average snowfall days
Chicago, IL

Average snowfall days - Chicago, IL

The month with the highest number of snowfall days is January (10.6 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature
Chicago, IL

Average sea temperature - Chicago, IL

The best month for swimming (with the highest average sea temperature) is August (23.3°C).
The coldest month (with the lowest average sea temperature) is February (2.7°C).

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Average daylight / Average sunshine
Chicago, IL

Average daylight / Average sunshine - Chicago, IL

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.2h).

Months with the most sunshine are July and August (Average sunshine: 10.6h).
The month with the least sunshine is January (Average sunshine: 3.7h).

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Average sunshine days
Chicago, IL

Average sunshine days - Chicago, IL

The month with the most sunshine days is December (15.5 days).
The month with the least sunshine days is July (9.3 days).

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Average visibility
Chicago, IL

Average visibility - Chicago, IL

Months with the highest visibility are September and October (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, November and December (9km).

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