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 a freezing cold winter month in Joliet, Illinois, with temperature in the range of an average low of 17.4°F (-8.1°C) and an average high of 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 temperature in the range of an average low of 20.7°F (-6.3°C) and an average high of 33.4°F (0.8°C). In Joliet, the average high-temperature in February is practically the same as in January - a wintry 33.4°F (0.8°C). Weather in February »

Weather in March

March, the first month of the spring in Joliet, is a chilly month, with an average temperature ranging between min 31.8°F (-0.1°C) and max 46.2°F (7.9°C). In March, the average high-temperature increases from a wintry 33.4°F (0.8°C) in February to a chilly 46.2°F (7.9°C). Weather in March »

Weather in April

April in Joliet, Illinois, is a mild spring month, with an average temperature ranging between max 58.1°F (14.5°C) and min 41.7°F (5.4°C). In Joliet, Illinois, the average high-temperature in April increases from a frosty 46.2°F (7.9°C) in March to a moderate 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 an average temperature varying between 52.3°F (11.3°C) and 70.3°F (21.3°C). In Joliet, the average high-temperature in May rises from a moderate 58.1°F (14.5°C) in April to a pleasant 70.3°F (21.3°C). Weather in May »

Weather in June

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

Weather in July

July, the same as June, is a moderately hot summer month in Joliet, Illinois, with an average temperature ranging between min 64.8°F (18.2°C) and max 81.3°F (27.4°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 evaluated at a hot 87.6°F (30.9°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 warm 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 temperature in the range of an average high of 74.7°F (23.7°C) and an average low of 56.7°F (13.7°C). In September, the average high-temperature slightly decreases 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, like September, in Joliet, Illinois, is another comfortable autumn month, with an average temperature ranging between max 61.3°F (16.3°C) and min 45.5°F (7.5°C). In Joliet, the average high-temperature in October drops from a warm 74.7°F (23.7°C) in September to an enjoyable 61.3°F (16.3°C). Weather in October »

Weather in November

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

Weather in December

December, the first month of the winter in Joliet, is still a cold 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 decreases 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?

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).

How much does it rain in Joliet?

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

When does it snow in Joliet?

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

When does it snow the most 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 much does it snow in Joliet?

Throughout the year, there are 38.2 snowfall days, and 14.61" (371mm) of snow is accumulated.

What is the month with the least sunshine in Joliet?

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

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

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

What is the most humid month in Joliet?

With an average relative humidity of 83%, February is the most humid month in Joliet.

What is the driest month in Joliet?

February is the month with the least rainfall in Joliet, Illinois. 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, 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 wettest month in Joliet?

The month with the most rainfall in Joliet is May, when the rain falls for 17.8 days and typically aggregates up to 4.41" (112mm) of precipitation.

When it does not snow in Joliet?

May through October are months without snowfall in Joliet, Illinois.

When are the longest days in Joliet?

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

When is the highest UV index in Joliet?

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

What is the warmest month in Joliet?

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

What month has the most sunshine in Joliet?

August has the most sunshine of the year in Joliet, Illinois, with an average of 9.7h of sunshine.

What is the least humid month in Joliet?

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

What is the month with the shortest days in Joliet?

The month with the shortest days is December, 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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