Naperville
Illinois, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Naperville, IL

The scenic view of a covered bridge over a river along the famous Naperville Riverwalk in Naperville, Illinois, reflections in the below water
The scenic view of a covered bridge over a river along the famous Naperville Riverwalk in Naperville, Illinois, reflections in the below water
January, the same as December, in Naperville, Illinois, is a freezing cold winter month, with temperature in the range of an average high of 28.4°F (-2°C) and an average low of 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 »

The last month of the winter, February, is a cold month in Naperville, Illinois, 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 is practically the same as in January - a wintry 32.4°F (0.2°C). Weather in February »

The first month of the spring, March, is a frosty month in Naperville, Illinois, 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 March, 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 »

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

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 increases, from a mild 56.8°F (13.8°C) in April, to an agreeable 69.1°F (20.6°C). Weather in May »

June, the first month of the summer, in Naperville, is a warm month, with average temperature fluctuating between 61.3°F (16.3°C) and 78.4°F (25.8°C). In Naperville, the average high-temperature in June increases, from a pleasant 69.1°F (20.6°C) in May, to a warm 78.4°F (25.8°C). Weather in June »

July, like June, in Naperville, Illinois, is another warm summer month, with average temperature fluctuating between 81.7°F (27.6°C) and 65.1°F (18.4°C). The warmest month is July, 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 estimated at a tropical 88°F (31.1°C). Weather in July »

August, the last month of the summer, in Naperville, is also a moderately hot month, with temperature in the range of an average high of 80.1°F (26.7°C) and an average low of 63.5°F (17.5°C). In Naperville, the average high-temperature is practically the same as in July - a still warm 80.1°F (26.7°C). Weather in August »

The first month of the autumn, September, is still a warm month in Naperville, Illinois, with temperature in the range of an average high of 73.8°F (23.2°C) and an average low of 57°F (13.9°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 73.8°F (23.2°C). Weather in September »

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

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

The first month of the winter, December, is still a cold month in Naperville, Illinois, with average temperature ranging between max 34.3°F (1.3°C) and min 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 »

What is the coldest month in Naperville?

The coldest month in Naperville, Illinois, 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 in Naperville.

How much does it rain in Naperville?

In Naperville, Illinois, 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?

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

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 snowiest month in Naperville?

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

What is the month with the least sunshine in Naperville?

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

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

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

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?

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

When are the longest days in Naperville?

The month with the longest days is June, with an average of 15.2h of daylight.

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

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

What is the warmest month in Naperville?

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).

What is the month with the most sunshine in Naperville?

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

What is the least humid month in Naperville?

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

What is the driest month in Naperville?

The month with the least rainfall in Naperville, Illinois, 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?

With an average of 9.2h of daylight, December has the shortest days of the year.
Average humidity - Naperville, IL
Average rainfall - 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 lowest number of rainy days is February (4.4 days).

Average snowfall - Naperville, IL
Average snowfall days - Naperville, IL

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

Average daylight / Average sunshine - Naperville, IL

The month with the longest days is June (Average daylight: 15.2h).
The month with shortest days is December (Average daylight: 9.2h).

Months with most sunshine are July and August (Average sunshine: 10h).
The month with least sunshine is January (Average sunshine: 3.8h).