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

Weather in February

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

Weather in March

March, the first month of the spring, in Chicago, is also a wintry month, with average temperature ranging between min 32.2°F (0.1°C) and max 41.5°F (5.3°C). In Chicago, the average high-temperature in March rises, from a wintry 32°F (0°C) in February, to a still cold 41.5°F (5.3°C). Weather in March »

Weather in April

April is a fresh spring month in Chicago, Illinois, with average temperature ranging between max 50.7°F (10.4°C) and min 40.6°F (4.8°C). In April, the average high-temperature increases, from a cold 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 an enjoyable month in Chicago, Illinois, with average temperature fluctuating between 61°F (16.1°C) and 50.4°F (10.2°C). In Chicago, the average high-temperature rises, from a cool 50.7°F (10.4°C) in April, to an enjoyable 61°F (16.1°C). Weather in May »

Weather in June

The first month of the summer, June, is an agreeable month in Chicago, Illinois, with average temperature ranging between min 60.3°F (15.7°C) and max 70.5°F (21.4°C). In June, the average high-temperature 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 temperature in the range of an average low of 67.8°F (19.9°C) and an average high of 77.4°F (25.2°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

August, the last month of the summer, in Chicago, is also a moderately hot month, with temperature in the range of an average low of 67.6°F (19.8°C) and an average high of 77.5°F (25.3°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

September, the first month of the autumn, in Chicago, is still a pleasant month, with average temperature varying between 61.2°F (16.2°C) and 71.1°F (21.7°C). In Chicago, the average high-temperature in September 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, the same as September, in Chicago, Illinois, is a moderate autumn month, with average temperature ranging between max 59.5°F (15.3°C) and min 48.9°F (9.4°C). In Chicago, the average high-temperature in October decreases, from an agreeable 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 another chilly month in Chicago, Illinois, with average temperature varying between 36.5°F (2.5°C) and 46°F (7.8°C). In November, the average high-temperature decreases, from a moderate 59.5°F (15.3°C) in October, to a chilly 46°F (7.8°C). Weather in November »

Weather in December

December, the first month of the winter, in Chicago, is still a cold month, with temperature in the range of an average low of 27.9°F (-2.3°C) and an average high of 35.8°F (2.1°C). In Chicago, the average high-temperature in December decreases, from a chilly 46°F (7.8°C) in November, to a wintry 35.8°F (2.1°C). Weather in December »
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FAQ

What is the coldest month in Chicago?

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

What is the most humid month in Chicago?

January is the most humid month, with an average relative humidity of 82%.

How many days does it rain in Chicago?

Throughout the year, there are 160.2 rainfall days, and 36.97" (939mm) of precipitation is accumulated.

When does it snow in Chicago?

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

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?

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

What is the snowiest month in Chicago?

February is the month with the most snowfall in Chicago. Snow falls for 9.9 days and accumulates 3.54" (90mm) of snow.

What month is the ocean coldest in Chicago?

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

What is the wettest month in Chicago?

The month with the most rainfall in Chicago, Illinois, is June when the rain falls for 17.5 days and typically aggregates up to 4.88" (124mm) of precipitation.

When it does not snow in Chicago?

In Chicago snow does not fall in June through October.

When are the longest days in Chicago?

June has the longest days of the year in Chicago, 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.

What is the month with 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?

August is the warmest month, 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?

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

What is the least humid month in Chicago?

The least humid month is October, with an average relative humidity of 73%.

What is the driest month in Chicago?

December is the month with the least rainfall. Rain falls for 8.8 days and accumulates 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 in Chicago.

Average temperature
Chicago, IL

Average temperature - Chicago, IL

The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is January (29.7°F).

The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).

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Average pressure
Chicago, IL

Average pressure - Chicago, IL

The month with the highest atmospheric pressure is January (30.11").
The month with the lowest atmospheric pressure is June (29.92").

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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 (12.5mph).
The calmest month (with the lowest average wind speed) is July (7.7mph).

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Average rainfall
Chicago, IL

Average rainfall - Chicago, IL

The wettest month (with the highest rainfall) is June (4.88").
The driest month (with the least rainfall) is December (1.65").

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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 (3.54").
Months with the least snowfall are June, July, August, September and October (0").

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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 (73.9°F).
The coldest month (with the lowest average sea temperature) is February (36.9°F).

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

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