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, the same as December, in Naperville, Illinois, is another subzero cold winter month, with an average temperature fluctuating between 28.4°F (-2°C) and 17.1°F (-8.3°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

The last month of the winter, February, is a wintry month in Naperville, Illinois, with temperature in the range of an average low of 19.9°F (-6.7°C) and an average high of 32.4°F (0.2°C). In February, the average high-temperature is essentially the same as in January - a cold 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 temperature in the range of an average high of 45.1°F (7.3°C) and an average low of 31.1°F (-0.5°C). In Naperville, Illinois, the average high-temperature in March rises from a cold 32.4°F (0.2°C) in February to a chilly 45.1°F (7.3°C). Weather in March »

Weather in April

April in Naperville, Illinois, is a moderate spring month, with temperature in the range of an average low of 40.5°F (4.7°C) and an average high of 56.8°F (13.8°C). In April, the average high-temperature rises 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

The last month of the spring, May, is a pleasant month in Naperville, Illinois, with an average temperature ranging between max 69.1°F (20.6°C) and min 51.8°F (11°C). In Naperville, the average high-temperature in May increases from a moderate 56.8°F (13.8°C) in April to an agreeable 69.1°F (20.6°C). Weather in May »

Weather in June

June, the first month of the summer in Naperville, is a moderately hot month, with an average temperature ranging between max 78.4°F (25.8°C) and min 61.3°F (16.3°C). In June, the average high-temperature rises from an agreeable 69.1°F (20.6°C) in May to a moderately hot 78.4°F (25.8°C). Weather in June »

Weather in July

July, like June, in Naperville, Illinois, is another warm summer month, with an average temperature varying between 65.1°F (18.4°C) and 81.7°F (27.6°C). July is the warmest month, with an average high-temperature of 81.7°F (27.6°C) and an average low-temperature of 65.1°F (18.4°C). In July, the average heat index is evaluated at a tropical 87.8°F (31°C). Weather in July »

Weather in August

August, the last month of the summer in Naperville, is another warm month, with an average temperature ranging between min 63.5°F (17.5°C) and max 80.1°F (26.7°C). In August, the average high-temperature is almost the same as in July - a still warm 80.1°F (26.7°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Naperville, Illinois, with an average temperature varying between 73.8°F (23.2°C) and 57°F (13.9°C). In Naperville, Illinois, the average high-temperature in September slightly decreases from a moderately hot 80.1°F (26.7°C) in August to a still warm 73.8°F (23.2°C). Weather in September »

Weather in October

October, like September, is a moderate autumn month in Naperville, Illinois, with an average temperature varying between 45.5°F (7.5°C) and 60.6°F (15.9°C). In October, the average high-temperature drops from a moderately hot 73.8°F (23.2°C) in September to a moderate 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 an average temperature fluctuating between 33.1°F (0.6°C) and 45.9°F (7.7°C). In November, the average high-temperature declines considerably from a moderate 60.6°F (15.9°C) in October to a frosty 45.9°F (7.7°C). Weather in November »

Weather in December

The first month of the winter, December, is still a cold month in Naperville, Illinois, with temperature in the range of an average high of 34.3°F (1.3°C) and an average low of 24.4°F (-4.2°C). In December, the average high-temperature drops from a frosty 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?

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

What is the most humid month in Naperville?

January and February, with an average relative humidity of 83%, are most humid months.

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.

What is the snowiest month in Naperville?

January is the month with the most snowfall in Naperville, Illinois. Snow falls for 11.1 days and accumulates 1.85" (47mm) of snow.

How many days 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?

With an average of 3.8h of sunshine, January has the least sunshine of the year in Naperville, Illinois.

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

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

When is Daylight Saving Time (DST) in Naperville?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts, 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 Naperville?

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

When it does not snow in Naperville?

May through September are months without snowfall in Naperville.

When are the longest days in Naperville?

June has the longest days of the year, with an average of 15h and 10min of daylight.

When is the highest UV index in Naperville?

The 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?

July and August, with an average of 10h of sunshine, are months with the most sunshine in Naperville.

What is the least humid month in Naperville?

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

What is the driest month in Naperville?

The month with the least rainfall in Naperville is December, when the rain falls for 6.4 days and typically collects 0.71" (18mm) of precipitation.

What is the month with the shortest days in Naperville?

The month with the shortest days is December, with an average of 9h and 13min 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"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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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

The 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").
The 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).
The 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: 15h and 10min).
The month with the shortest days is December (Average daylight: 9h and 13min).

The months with the most sunshine are July and August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

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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 UV index
Naperville, IL

Average UV index - Naperville, IL

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

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Average visibility
Naperville, IL

Average visibility - Naperville, IL

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

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