April weather forecast and climate
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 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).

Temperature

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). In Naperville, in April, the average low-temperature is 40.5°F (4.7°C).

Humidity

The average relative humidity in Naperville is 75%.

Rainfall

In Naperville, in April, it is raining for 13.6 days, with typically 1.69" (43mm) of accumulated precipitation. Throughout the year, in Naperville, there are 132.2 rainfall days, and 16.22" (412mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, October through December. April is the last month it regularly snows in Naperville. During 2 snowfall days, in April, Naperville aggregates 1.26" (32mm) of snow. In Naperville, Illinois, during the entire year, snow falls for 38.7 days, and aggregates up to 6.93" (176mm) of snow.

Daylight

In April, the average length of the day in Naperville is 13.4h.

Sunshine

The average sunshine in April is 7.6h.

UV index

The average daily maximum UV index in April is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to the UV radiation for average individuals.
Note: The daily maximum UV index of 3 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in April in Naperville?

The average relative humidity in April in Naperville is 75%.

How much does it rain in Naperville in April?

In Naperville, during April, the rain falls for 13.6 days and regularly aggregates up to 1.69" (43mm) of precipitation.

What is the last month it snows in Naperville?

April is the last month it regularly snows in Naperville. During 2 snowfall days, in April, Naperville aggregates 1.26" (32mm) of snow.

What is the average length of the day in April in Naperville?

In Naperville, the average length of the day in April is 13.4h.

How many hours of sunshine does Naperville have in April?

In Naperville, Illinois, the average sunshine in April is 7.6h.

What is the UV index reading in April in Naperville?

In Naperville, the average daily maximum UV index in April is 3. A UV Index estimate of 3 to 5 represents a moderate vulnerability from the exposure to the Sun's UV rays.

Average temperature in April
Naperville, IL

Average temperature in April - Naperville, IL
  • Average high temperature in April: 56.8°F

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).

  • Average low temperature in April: 40.5°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 in April
Naperville, IL

Average pressure in April - Naperville, IL
  • Average pressure in April: 29.95"

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 in April
Naperville, IL

Average wind speed in April - Naperville, IL
  • Average wind speed in April: 9.6mph

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 in April
Naperville, IL

Average humidity in April - Naperville, IL
  • Average humidity in April: 75%

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 in April
Naperville, IL

Average rainfall in April - Naperville, IL
  • Average rainfall in April: 1.69"

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 in April
Naperville, IL

Average rainfall days in April - Naperville, IL
  • Average rainfall days in April: 13.6 days

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 in April
Naperville, IL

Average snowfall in April - Naperville, IL
  • Average snowfall in April: 1.26"

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 in April
Naperville, IL

Average snowfall days in April - Naperville, IL
  • Average snowfall days in April: 2 days

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 in April /
Average sunshine in April
Naperville, IL

Average daylight in April / Average sunshine in April - Naperville, IL
  • Average daylight in April: 13.4h

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

  • Average sunshine in April: 7.6h

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 in April
Naperville, IL

Average sunshine days in April - Naperville, IL
  • Average sunshine days in April: 12.8 days

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 in April
Naperville, IL

Average UV index in April - Naperville, IL
  • Average UV index in April: 3

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

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Average cloud cover in April
Naperville, IL

Average cloud cover in April - Naperville, IL
  • Average cloud cover in April: 49

The month with the most cloud cover is January (Cloud cover 60).
Months with the least cloud cover are August and September (Cloud cover 31).

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Average visibility in April
Naperville, IL

Average visibility in April - Naperville, IL
  • Average visibility in April: 6mi

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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