April weather forecast
Oak Brook, IL

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Weather in April

April in Oak Brook, Illinois, is a mild spring month, with an average temperature varying between 40.6°F (4.8°C) and 56.5°F (13.6°C).

Temperature

April's arrival brings a change in high-temperatures, moving from a frosty 45.1°F (7.3°C) in March to a refreshing 56.5°F (13.6°C). Oak Brook usually reports an average low-temperature of 40.6°F (4.8°C) during the month of April.

Humidity

In April, the average relative humidity in Oak Brook is 74%.

Rainfall

In Oak Brook, Illinois, in April, it is raining for 12.8 days, with typically 1.38" (35mm) of accumulated precipitation. Throughout the year, in Oak Brook, Illinois, there are 118.5 rainfall days, and 13.74" (349mm) of precipitation is accumulated.

Snowfall

January through April, October through December are months with snowfall. April is the last month it regularly snows in Oak Brook. During 1.4 snowfall days, in April, Oak Brook aggregates 1.1" (28mm) of snow. Throughout the year, in Oak Brook, there are 34.9 snowfall days, and 7.2" (183mm) of snow is accumulated.

Daylight

In Oak Brook, the average length of the day in April is 13h and 23min.
On the first day of the month, sunrise is at 6:33 am and sunset at 7:17 pm. On the last day of April, sunrise is at 5:48 am and sunset at 7:49 pm CDT.

Sunshine

In April, the average sunshine in Oak Brook is 7.6h.

UV index

In Oak Brook, Illinois, the average daily maximum UV index in April is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily high UV index of 3 in April translates into this advice:
Put precautions into practice - Ensuring skin and eye safety is a necessity. It's recommended to limit sun exposure when its radiation is at its peak during midday. Opt for tightly woven and loose clothing to enhance protection from the Sun. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
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Frequently asked questions

What are the temperatures in Oak Brook in April?

In Oak Brook, 56.5°F (13.6°C) is the average high-temperature and 40.6°F (4.8°C) is the average low-temperature during April.

What is the average humidity in April in Oak Brook?

In April, the average relative humidity in Oak Brook is 74%.

How much does it rain in Oak Brook in April?

In Oak Brook, in April, it is raining for 12.8 days, with typically 1.38" (35mm) of accumulated precipitation.

What is the last month it snows in Oak Brook?

April is the last month it regularly snows. During 1.4 snowfall days, in April, Oak Brook aggregates 1.1" (28mm) of snow.

How many hours of daylight does Oak Brook have in April?

In Oak Brook, the average day length in April is 13h and 23min.

When are sunrise and sunset in April in Oak Brook?

In April, on the first day of the month, sunrise is at 6:33 am and sunset at 7:17 pm. On the last day of the month, sunrise is at 5:48 am and sunset at 7:49 pm CDT.

How many hours of sunshine does Oak Brook have in April?

In Oak Brook, the average sunshine duration in April is 7.6h.

How high is the UV index in April in Oak Brook?

In Oak Brook, Illinois, the average daily maximum UV index in April is 3. A UV Index reading of 3 to 5 represents a moderate health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in April
Oak Brook, IL

Average temperature in April - Oak Brook, IL
  • Average high temperature in April: 56.5°F

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (28.8°F).

  • Average low temperature in April: 40.6°F

The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).

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Average pressure in April
Oak Brook, IL

Average pressure in April - Oak Brook, IL
  • Average pressure in April: 29.95"Hg

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 in April
Oak Brook, IL

Average wind speed in April - Oak Brook, IL
  • Average wind speed in April: 9.4mph

The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).

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Average humidity in April
Oak Brook, IL

Average humidity in April - Oak Brook, IL
  • Average humidity in April: 74%

The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in April
Oak Brook, IL

Average rainfall in April - Oak Brook, IL
  • Average rainfall in April: 1.38"

The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is December (0.63").

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Average rainfall days in April
Oak Brook, IL

Average rainfall days in April - Oak Brook, IL
  • Average rainfall days in April: 12.8 days

The month with the highest number of rainy days is May (14.9 days).
The month with the least rainy days is February (4.2 days).

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Average snowfall in April
Oak Brook, IL

Average snowfall in April - Oak Brook, IL
  • Average snowfall in April: 1.1"

The month with the highest snowfall is February (2.28").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in April
Oak Brook, IL

Average snowfall days in April - Oak Brook, IL
  • Average snowfall days in April: 1.4 days

The month with the highest number of snowfall days is January (9.7 days).
The 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
Oak Brook, IL

Average daylight in April / Average sunshine in April - Oak Brook, IL
  • Average daylight in April: 13h and 2min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in April: 7h and 4min

The month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days in April
Oak Brook, IL

Average sunshine days in April - Oak Brook, IL
  • Average sunshine days in April: 13.8 days

The month with the most sunshine days is December (20.7 days).
The month with the least sunshine days is July (11.8 days).

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Average UV index in April
Oak Brook, IL

Average UV index in April - Oak Brook, IL
  • Average UV index in April: 3

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

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Average cloud cover in April
Oak Brook, IL

Average cloud cover in April - Oak Brook, IL
  • Average cloud cover in April: 50

The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 31).

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Average visibility in April
Oak Brook, IL

Average visibility in April - Oak Brook, IL
  • Average visibility in April: 6mi

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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Oak Brook, Illinois, USA

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