Chicago
Illinois, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Chicago, IL

An aerial view of the city of Chicago in Illinois, on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street
An aerial view of the city of Chicago in Illinois, on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street
January, the same as December, in Chicago, Illinois, is another subzero cold winter month, with average temperature fluctuating between 20.7°F (-6.3°C) and 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 »

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

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

April is a fresh spring month in Chicago, Illinois, with temperature in the range of an average low of 40.6°F (4.8°C) and an average high of 50.7°F (10.4°C). In Chicago, Illinois, the average high-temperature in April increases, from a cold 41.5°F (5.3°C) in March, to a cool 50.7°F (10.4°C). Weather in April »

The last month of the spring, May, is an enjoyable month in Chicago, Illinois, with average temperature varying between 50.4°F (10.2°C) and 61°F (16.1°C). In May, 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 »

June, the first month of the summer, in Chicago, is an agreeable month, 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 »

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

August, the last month of the summer, in Chicago, is another warm month, 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 »

The first month of the autumn, September, is still a pleasant month in Chicago, Illinois, with average temperature varying between 61.2°F (16.2°C) and 71.1°F (21.7°C). In Chicago, Illinois, the average high-temperature marginally drops, from a moderately hot 77.5°F (25.3°C) in August, to an agreeable 71.1°F (21.7°C). Weather in September »

October, like September, is another mild autumn month in Chicago, Illinois, with average temperature fluctuating between 59.5°F (15.3°C) and 48.9°F (9.4°C). In Chicago, the average high-temperature decreases, from an agreeable 71.1°F (21.7°C) in September, to a mild 59.5°F (15.3°C). Weather in October »

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

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

What is the coldest month in Chicago?

January 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).

What is the most humid month in Chicago?

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

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?

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

How many days does it snow in Chicago?

In Chicago, during the entire year, snow falls for 40.9 days, and aggregates up to 13.9" (353mm) of snow.

What is the month with the least sunshine in Chicago?

The month with the least sunshine in Chicago is January, with an average of 3.7h of sunshine.

When is the lowest UV index in Chicago?

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

What is the snowiest month in Chicago?

The month with the most snowfall in Chicago 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?

February is the month with the coldest seawater, 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. Rain falls for 17.5 days and accumulates 4.88" (124mm) of precipitation.

When it does not snow in Chicago?

June through October are months without snowfall.

When are the longest days in Chicago?

June has the longest days of the year in Chicago, Illinois, with an average of 15.2h of daylight.

What are the months with the most sunshine in Chicago?

Months with the most sunshine are July and August, with an average of 10.6h of 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 in Chicago, Illinois, 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 month is the ocean warmest in Chicago?

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

What is the least humid month in Chicago?

October is the least humid month in Chicago, Illinois, with an average relative humidity of 73%.

What is the driest month in Chicago?

December is the month with the least rainfall in Chicago, Illinois. Rain falls for 8.8 days and accumulates 1.65" (42mm) of precipitation.

What is the month with the shortest days in Chicago?

The month with the shortest days is December, with an average of 9.2h of daylight.
Average temperature - Chicago, IL
Average rainfall - Chicago, IL

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

Average rainfall days - Chicago, IL

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

Average snowfall - Chicago, IL

The month with the highest snowfall is February (3.54").
Months with the lowest snowfall are June, July, August, September and October (0").

Average snowfall days - Chicago, IL

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

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).

Average daylight / Average sunshine - Chicago, IL

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

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