Climate and monthly weather forecast
Joliet, IL

A unique shot of cars, trees, and buildings along a street in the town of Joliet, Illinois
A unique shot of cars, trees, and buildings along a street in the town of Joliet, Illinois

Weather in January

January, like December, is another subzero cold winter month in Joliet, Illinois, with an average temperature varying between 17.4°F (-8.1°C) and 29.3°F (-1.5°C). The coldest month is January, with an average high-temperature of 29.3°F (-1.5°C) and an average low-temperature of 17.4°F (-8.1°C). Weather in January »

Weather in February

February, the last month of the winter in Joliet, is a cold month, with an average temperature fluctuating between 33.4°F (0.8°C) and 20.7°F (-6.3°C). In February, the average high-temperature is almost the same as in January - a cold 33.4°F (0.8°C). Weather in February »

Weather in March

The first month of the spring, March, is a frosty month in Joliet, Illinois, with an average temperature fluctuating between 46.2°F (7.9°C) and 31.8°F (-0.1°C). In Joliet, the average high-temperature in March rises from a wintry 33.4°F (0.8°C) in February to a frosty 46.2°F (7.9°C). Weather in March »

Weather in April

April in Joliet, Illinois, is a moderate spring month, with an average temperature ranging between min 41.7°F (5.4°C) and max 58.1°F (14.5°C). In Joliet, the average high-temperature in April rises from a chilly 46.2°F (7.9°C) in March to a mild 58.1°F (14.5°C). Weather in April »

Weather in May

The last month of the spring, May, is an agreeable month in Joliet, Illinois, with temperature in the range of an average high of 70.3°F (21.3°C) and an average low of 52.3°F (11.3°C). In May, the average high-temperature rises from a moderate 58.1°F (14.5°C) in April to an agreeable 70.3°F (21.3°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Joliet, Illinois, with temperature in the range of an average low of 61.3°F (16.3°C) and an average high of 79.2°F (26.2°C). In June, the average high-temperature slightly increases from an agreeable 70.3°F (21.3°C) in May to a moderately hot 79.2°F (26.2°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Joliet, Illinois, with temperature in the range of an average high of 81.3°F (27.4°C) and an average low of 64.8°F (18.2°C). With an average high-temperature of 81.3°F (27.4°C) and an average low-temperature of 64.8°F (18.2°C), July is the warmest month. In July, the average heat index is calculated to be a tropical 87.8°F (31°C). Weather in July »

Weather in August

August, the last month of the summer in Joliet, is also a moderately hot month, with an average temperature fluctuating between 62.8°F (17.1°C) and 80.1°F (26.7°C). In August, the average high-temperature is relatively the same as in July - a still moderately hot 80.1°F (26.7°C). Weather in August »

Weather in September

September, the first month of the autumn in Joliet, is still a warm month, with an average temperature fluctuating between 56.7°F (13.7°C) and 74.7°F (23.7°C). In September, the average high-temperature marginally drops from a warm 80.1°F (26.7°C) in August to a still moderately hot 74.7°F (23.7°C). Weather in September »

Weather in October

October, the same as September, is another enjoyable autumn month in Joliet, Illinois, with temperature in the range of an average high of 61.3°F (16.3°C) and an average low of 45.5°F (7.5°C). In Joliet, the average high-temperature in October decreases from a moderately hot 74.7°F (23.7°C) in September to an enjoyable 61.3°F (16.3°C). Weather in October »

Weather in November

The last month of the autumn, November, is another chilly month in Joliet, Illinois, with an average temperature ranging between min 33.4°F (0.8°C) and max 47.1°F (8.4°C). In Joliet, the average high-temperature in November drops from a comfortable 61.3°F (16.3°C) in October to a chilly 47.1°F (8.4°C). Weather in November »

Weather in December

December, the first month of the winter in Joliet, is also a wintry month, with an average temperature fluctuating between 35.1°F (1.7°C) and 25°F (-3.9°C). In Joliet, the average high-temperature in December drops from a frosty 47.1°F (8.4°C) in November to a wintry 35.1°F (1.7°C). Weather in December »
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FAQ

What is the coldest month in Joliet?

January is the coldest month, with an average high-temperature of 29.3°F (-1.5°C) and an average low-temperature of 17.4°F (-8.1°C).

How many days does it rain in Joliet?

Throughout the year, there are 153.6 rainfall days, and 32.72" (831mm) of precipitation is accumulated.

When does it snow in Joliet?

January through April, November and December are months with snowfall in Joliet.

What is the snowiest month in Joliet?

January is the month with the most snowfall in Joliet, Illinois. Snow falls for 11.9 days and accumulates 4.33" (110mm) of snow.

How many days does it snow in Joliet?

In Joliet, during the entire year, snow falls for 38.2 days and aggregates up to 14.61" (371mm) of snow.

What is the month with the least sunshine in Joliet?

With an average of 3.7h of sunshine, January has the least sunshine of the year in Joliet, Illinois.

When is the lowest UV index in Joliet?

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

What is the most humid month in Joliet?

The most humid month is February, with an average relative humidity of 83%.

What is the driest month in Joliet?

February is the month with the least rainfall in Joliet. Rain falls for 5.7 days and accumulates 1.61" (41mm) of precipitation.

When is Daylight Saving Time (DST) in Joliet?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in Joliet, Illinois, 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.

What is the rainiest month in Joliet?

May is the month with the most rainfall in Joliet. Rain falls for 17.8 days and accumulates 4.41" (112mm) of precipitation.

When it does not snow in Joliet?

In Joliet, snow does not fall in May through October.

When are the longest days in Joliet?

June has the longest days of the year in Joliet, Illinois, with an average of 15h and 8min of daylight.

What is the month with the highest UV index in Joliet?

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

What is the warmest month in Joliet?

With an average high-temperature of 81.3°F (27.4°C) and an average low-temperature of 64.8°F (18.2°C), July is the warmest month.

What month has the most sunshine in Joliet?

With an average of 9.7h of sunshine, August has the most sunshine of the year.

What is the least humid month in Joliet?

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

What is the month with the shortest days in Joliet?

December has the shortest days of the year in Joliet, Illinois, with an average of 9h and 14min of daylight.

Average temperature
Joliet, IL

Average temperature - Joliet, IL

The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (29.3°F).

The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).

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Average pressure
Joliet, IL

Average pressure - Joliet, IL

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed
Joliet, IL

Average wind speed - Joliet, IL

The windiest month (with the highest average wind speed) is April (9.7mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).

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Average rainfall
Joliet, IL

Average rainfall - Joliet, IL

The wettest month (with the highest rainfall) is May (4.41").
The driest month (with the least rainfall) is February (1.61").

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Average rainfall days
Joliet, IL

Average rainfall days - Joliet, IL

The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is February (5.7 days).

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Average snowfall
Joliet, IL

Average snowfall - Joliet, IL

The month with the highest snowfall is January (4.33").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days
Joliet, IL

Average snowfall days - Joliet, IL

The month with the highest number of snowfall days is January (11.9 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
Joliet, IL

Average daylight / Average sunshine - Joliet, IL

The month with the longest days is June (Average daylight: 15h and 8min).
The month with the shortest days is December (Average daylight: 9h and 14min).

The month with the most sunshine is August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days
Joliet, IL

Average sunshine days - Joliet, IL

The month with the most sunshine days is November (18.1 days).
The month with the least sunshine days is June (10.4 days).

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Average visibility
Joliet, IL

Average visibility - Joliet, IL

The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).

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