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

April weather forecast and climate
Chicago, IL

An aerial view of the city of Chicago in Illinois, on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street
An aerial view of the city of Chicago in Illinois, on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street
April is a fresh spring month in Chicago, Illinois, with temperature in the range of an average low of 40.6°F (4.8°C) and an average high of 50.7°F (10.4°C).

Temperature

In Chicago, Illinois, the average high-temperature in April increases, from a cold 41.5°F (5.3°C) in March, to a cool 50.7°F (10.4°C). The average low-temperature, in Chicago, is 40.6°F (4.8°C).

Humidity

In April, the average relative humidity in Chicago, Illinois, is 77%.

Rainfall

In Chicago, during April, the rain falls for 16.6 days and regularly aggregates up to 3.7" (94mm) of precipitation. In Chicago, during the entire year, the rain falls for 160.2 days and collects up to 36.97" (939mm) of precipitation.

Snowfall

January through May, November and December are months with snowfall. In Chicago, snow falls for 2.4 days, with typically accumulated 1.61" (41mm) of snow. Throughout the year, there are 40.9 snowfall days, and 13.9" (353mm) of snow is accumulated.

Ocean temperature

In April, the average ocean temperature in Chicago is 41°F (5°C).
Note: Swimming in 41°F (5°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

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

Sunshine

The average sunshine in Chicago is 7.8h.

UV index

The average daily maximum UV index in April is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against sun damage is advised. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in April in Chicago?

In April, the average high-temperature is 50.7°F (10.4°C), and the average low-temperature is 40.6°F (4.8°C).

What is the average humidity in April in Chicago?

The average relative humidity in April is 77%.

How much does it rain in Chicago in April?

In April, the rain falls for 16.6 days. Throughout April, 3.7" (94mm) of precipitation is accumulated.

How many days does it snow in April in Chicago?

In Chicago, Illinois, in April, during 2.4 snowfall days, 1.61" (41mm) of snow is typically accumulated.

What is the water temperature in April in Chicago?

In Chicago, the average seawater temperature in April is 41°F (5°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

How many hours of daylight does Chicago have in April?

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

How many hours of sunshine does Chicago have in April?

In Chicago, Illinois, the average sunshine in April is 7.8h.

How high is the UV index in April in Chicago?

In Chicago, the average daily maximum UV index in April is 3. A UV Index reading of 3 to 5 represents a medium health risk from unsafe exposure to the Sun's UV rays.
Average temperature in April - Chicago, IL
  • Average high temperature in April: 50.7°F

The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in April: 40.6°F

The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).

Average humidity in April - Chicago, IL
  • Average humidity in April: 77%

The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (73%).

Average rainfall in April - Chicago, IL
  • Average rainfall in April: 3.7"

The wettest month (with the highest rainfall) is June (4.88").
The driest month (with the lowest rainfall) is December (1.65").

Average rainfall days in April - Chicago, IL
  • Average rainfall days in April: 16.6 days

The month with the highest number of rainy days is July (18.5 days).
The month with the lowest number of rainy days is February (5.5 days).

Average snowfall in April - Chicago, IL
  • Average snowfall in April: 1.61"

The month with the highest snowfall is February (3.54").
Months with the lowest snowfall are June, July, August, September and October (0").

Average snowfall days in April - Chicago, IL
  • Average snowfall days in April: 2.4 days

The month with the highest number of snowfall days is January (10.6 days).
Months with the lowest number of snowfall days are June, July, August and September (0 days).

Average sea temperature in April - Chicago, IL
  • Average sea temperature in April: 40.9°F

The best month for swimming (with the highest average sea temperature) is August (73.9°F).
The coldest month (with the lowest average sea temperature) is February (36.9°F).

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

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

  • Average sunshine in April: 7.8h

Months with most sunshine are July and August (Average sunshine: 10.6h).
The month with least sunshine is January (Average sunshine: 3.7h).

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

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