Climate and monthly weather forecast
Naperville, IL

A covered bridge over a river along the famous Naperville Riverwalk in Naperville, Illinois
A covered bridge over a river along the famous Naperville Riverwalk in Naperville, Illinois

Weather in January

January, like December, is a freezing cold winter month in Naperville, Illinois, with temperature in the range of an average low of 17.1°F (-8.3°C) and an average high of 28.4°F (-2°C). January is the coldest month, with an average high-temperature of 28.4°F (-2°C) and an average low-temperature of 17.1°F (-8.3°C). Weather in January »

Weather in February

February, the last month of the winter, in Naperville, is a wintry month, with average temperature ranging between max 32.4°F (0.2°C) and min 19.9°F (-6.7°C). In Naperville, the average high-temperature in February is almost the same as in January - a wintry 32.4°F (0.2°C). Weather in February »

Weather in March

March, the first month of the spring, in Naperville, is a frosty month, with average temperature varying between 31.1°F (-0.5°C) and 45.1°F (7.3°C). In Naperville, the average high-temperature increases, from a wintry 32.4°F (0.2°C) in February, to a frosty 45.1°F (7.3°C). Weather in March »

Weather in April

April in Naperville, Illinois, is a mild spring month, with average temperature ranging between min 40.5°F (4.7°C) and max 56.8°F (13.8°C). In Naperville, the average high-temperature increases, from a frosty 45.1°F (7.3°C) in March, to a mild 56.8°F (13.8°C). Weather in April »

Weather in May

May, the last month of the spring, in Naperville, is an agreeable month, with average temperature varying between 51.8°F (11°C) and 69.1°F (20.6°C). In May, the average high-temperature rises, from a mild 56.8°F (13.8°C) in April, to a pleasant 69.1°F (20.6°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Naperville, Illinois, with temperature in the range of an average low of 61.3°F (16.3°C) and an average high of 78.4°F (25.8°C). In Naperville, the average high-temperature in June rises, from an agreeable 69.1°F (20.6°C) in May, to a warm 78.4°F (25.8°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Naperville, Illinois, with average temperature fluctuating between 81.7°F (27.6°C) and 65.1°F (18.4°C). With an average high-temperature of 81.7°F (27.6°C) and an average low-temperature of 65.1°F (18.4°C), July is the warmest month. In July, the average heat index is evaluated at a tropical 88°F (31.1°C). Weather in July »

Weather in August

August, the last month of the summer, in Naperville, is another warm month, with average temperature fluctuating between 80.1°F (26.7°C) and 63.5°F (17.5°C). In Naperville, the average high-temperature in August 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 Naperville, is also a moderately hot month, with average temperature varying between 57°F (13.9°C) and 73.8°F (23.2°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 73.8°F (23.2°C). Weather in September »

Weather in October

October, the same as September, in Naperville, Illinois, is another mild autumn month, with average temperature fluctuating between 60.6°F (15.9°C) and 45.5°F (7.5°C). In Naperville, the average high-temperature in October drops, from a warm 73.8°F (23.2°C) in September, to a mild 60.6°F (15.9°C). Weather in October »

Weather in November

The last month of the autumn, November, is another chilly month in Naperville, Illinois, with average temperature ranging between max 45.9°F (7.7°C) and min 33.1°F (0.6°C). In Naperville, the average high-temperature declines considerably, from a mild 60.6°F (15.9°C) in October, to a frosty 45.9°F (7.7°C). Weather in November »

Weather in December

December, the first month of the winter, in Naperville, is also a wintry month, with average temperature varying between 34.3°F (1.3°C) and 24.4°F (-4.2°C). In December, the average high-temperature drops, from a chilly 45.9°F (7.7°C) in November, to a cold 34.3°F (1.3°C). Weather in December »
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FAQ

What is the coldest month in Naperville?

January is the coldest month in Naperville, with an average high-temperature of 28.4°F (-2°C) and an average low-temperature of 17.1°F (-8.3°C).

What are the most humid months in Naperville?

Months with the highest humidity are January and February, with an average relative humidity of 83%.

How much does it rain in Naperville?

In Naperville, during the entire year, the rain falls for 132.2 days and collects up to 16.22" (412mm) of precipitation.

When does it snow in Naperville?

January through April, October through December are months with snowfall in Naperville, Illinois.

When does it snow the most in Naperville?

The month with the most snowfall in Naperville, Illinois, is January when snow falls for 11.1 days and typically aggregates up to 1.85" (47mm) of snow.

How much does it snow in Naperville?

Throughout the year, in Naperville, there are 38.7 snowfall days, and 6.93" (176mm) of snow is accumulated.

What is the month with the least sunshine in Naperville?

January has the least sunshine of the year, with an average of 3.8h of sunshine.

What are the months with the lowest UV index in Naperville?

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

What is the rainiest month in Naperville?

May is the month with the most rainfall. Rain falls for 14.8 days and accumulates 2.09" (53mm) of precipitation.

When it does not snow in Naperville?

In Naperville, Illinois, snow does not fall in May through September.

When are the longest days in Naperville?

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

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

Months with the highest UV index in Naperville are June through August, with an average maximum UV index of 6.

What is the warmest month in Naperville?

July is the warmest month in Naperville, with an average high-temperature of 81.7°F (27.6°C) and an average low-temperature of 65.1°F (18.4°C).

What are the months with the most sunshine in Naperville?

Months with the most sunshine are July and August, with an average of 10h of sunshine.

What is the least humid month in Naperville?

With an average relative humidity of 73%, October is the least humid month.

What is the driest month in Naperville?

December is the month with the least rainfall in Naperville, Illinois. Rain falls for 6.4 days and accumulates 0.71" (18mm) of precipitation.

What is the month with the shortest days in Naperville?

December has the shortest days of the year in Naperville, Illinois, with an average of 9.2h of daylight.

Average temperature
Naperville, IL

Average temperature - Naperville, IL

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28.4°F).

The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).

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Average pressure
Naperville, IL

Average pressure - Naperville, 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
Naperville, IL

Average wind speed - Naperville, IL

The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).

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Average humidity
Naperville, IL

Average humidity - Naperville, IL

Months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (73%).

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Average rainfall
Naperville, IL

Average rainfall - Naperville, IL

The wettest month (with the highest rainfall) is May (2.09").
The driest month (with the least rainfall) is December (0.71").

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Average rainfall days
Naperville, IL

Average rainfall days - Naperville, IL

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is February (4.4 days).

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Average snowfall
Naperville, IL

Average snowfall - Naperville, IL

The month with the highest snowfall is January (1.85").
Months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days
Naperville, IL

Average snowfall days - Naperville, IL

The month with the highest number of snowfall days is January (11.1 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Naperville, IL

Average daylight / Average sunshine - Naperville, 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: 10h).
The month with the least sunshine is January (Average sunshine: 3.8h).

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Average sunshine days
Naperville, IL

Average sunshine days - Naperville, IL

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (10.2 days).

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Average visibility
Naperville, IL

Average visibility - Naperville, 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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