Monthly weather forecast and climate
Joliet, IL

 A unique shot of cars, trees, and buildings along a street in the town of Joliet, Illinois, with a view of the clear blue sky above
A unique shot of cars, trees, and buildings along a street in the town of Joliet, Illinois, with a view of the clear blue sky above
January, the same as December, in Joliet, Illinois, is another subzero cold winter month, with average temperature varying between 30.9°F (-0.6°C) and 16°F (-8.9°C). January is the coldest month, with an average high-temperature of 30.9°F (-0.6°C) and an average low-temperature of 16°F (-8.9°C). Weather in January »
The last month of the winter, February, is a cold month in Joliet, Illinois, with average temperature fluctuating between 19.9°F (-6.7°C) and 36°F (2.2°C). The average high-temperature, is 36°F (2.2°C), while the average low-temperature is 19.9°F (-6.7°C). Weather in February »

March, the first month of the spring, in Joliet, is a chilly month, with temperature in the range of an average low of 28.9°F (-1.7°C) and an average high of 46.9°F (8.3°C). The average high-temperature, is 46.9°F (8.3°C), while the average low-temperature is 28.9°F (-1.7°C). Weather in March »

April is a comfortable spring month in Joliet, Illinois, with average temperature ranging between max. 61°F (16.1°C) and min. 39°F (3.9°C). In Joliet, the average high-temperature is 61°F (16.1°C), and the average low-temperature is 39°F (3.9°C). Weather in April »

May, the last month of the spring, in Joliet, is a pleasant month, with average temperature varying between 71.1°F (21.7°C) and 48.9°F (9.4°C). In May, the average high-temperature is 71.1°F (21.7°C), and the average low-temperature is 48.9°F (9.4°C). Weather in May »

The first month of the summer, June, is a warm month in Joliet, Illinois, with temperature in the range of an average high of 81°F (27.2°C) and an average low of 59°F (15°C). In Joliet, the average high-temperature is 81°F (27.2°C), and the average low-temperature is 59°F (15°C). Weather in June »

July, the same as June, is another warm summer month in Joliet, Illinois, with average temperature fluctuating between 84°F (28.9°C) and 64°F (17.8°C). With an average high-temperature of 84°F (28.9°C) and an average low-temperature of 64°F (17.8°C), July is the warmest month. Weather in July »

The last month of the summer, August, is another warm month in Joliet, Illinois, with temperature in the range of an average low of 63°F (17.2°C) and an average high of 82.9°F (28.3°C). In Joliet, in August, the average high-temperature is 82.9°F (28.3°C), and the average low-temperature is 63°F (17.2°C). Weather in August »

September, the first month of the autumn, in Joliet, is also a warm month, with average temperature fluctuating between 75.9°F (24.4°C) and 54°F (12.2°C). The average high-temperature, is 75.9°F (24.4°C), while the average low-temperature is 54°F (12.2°C). Weather in September »

October, the same as September, is another comfortable autumn month in Joliet, Illinois, with average temperature varying between 64°F (17.8°C) and 43°F (6.1°C). The average high-temperature, is 64°F (17.8°C), while the average low-temperature is 43°F (6.1°C). Weather in October »

The last month of the autumn, November, is another cool month in Joliet, Illinois, with average temperature varying between 33.1°F (0.6°C) and 50°F (10°C). In Joliet, in November, the average high-temperature is 50°F (10°C), and the average low-temperature is 33.1°F (0.6°C). Weather in November »

The first month of the winter, December, is also a cold month in Joliet, Illinois, with average temperature ranging between min. 19.9°F (-6.7°C) and max. 35.1°F (1.7°C). In December, the average high-temperature is 35.1°F (1.7°C), and the average low-temperature is 19.9°F (-6.7°C). Weather in December »

What is the coldest month in Joliet?

January is the coldest month in Joliet, with an average high-temperature of 30.9°F (-0.6°C) and an average low-temperature of 16°F (-8.9°C).

How many days does it rain in Joliet?

Throughout the year, there are 121.1 rainfall days, and 36.3" (922mm) of precipitation is accumulated.

What is the driest month in Joliet?

February is the month with the least rainfall in Joliet. Rain falls for 8.9 days and accumulates 1.7" (43.9mm) of precipitation.

When are the longest days in Joliet?

The month with the longest days in Joliet, Illinois, is June, with an average of 15.1h of daylight.

What is the warmest month in Joliet?

The warmest month in Joliet is July, with an average high-temperature of 84°F (28.9°C) and an average low-temperature of 64°F (17.8°C).

What is the wettest month in Joliet?

The month with the most rainfall is July when the rain falls for 9.4 days and typically aggregates up to 4.3" (110mm) of precipitation.

What is the month with the shortest days in Joliet?

December has the shortest days of the year in Joliet, with an average of 9.2h of daylight.
Average rainfall - Joliet, IL
Average rainfall days - Joliet, IL

The month with the highest number of rainy days is April (11.4 days).
The month with the lowest number of rainy days is September (8.2 days).

Average daylight - Joliet, IL

The month with the longest days is June (Average daylight: 15.1h).
The month with shortest days is December (Average daylight: 9.2h).

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