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 one of the best times to visit Chicago in the warm but wet spring weather. The rain gauge accumulates 3.4" (86.4mm) on an average in the city.
The average temperatures are in the 39°F (3.9°C) to 59°F (15°C) with most of the days above 40°F (4.4°C) and nights above freezing. Spring brings the most unpredictable weather though, and April temperatures vary from a low 20°F (-6.7°C) to a high 80°F (26.7°C).
The last snow usually falls during the month as the sunlight increases to 13 hours.
Tourists flock to the public shores around Lake Michigan even though the waters are cold. Keep an eye on the weather for thunderstorms!

What is the temperature in April in Chicago?

The average high-temperature, in April, in Chicago, is 59.2°F (15.1°C), while the average low-temperature is 41.7°F (5.4°C).

What is the average humidity in April in Chicago?

The average relative humidity in April in Chicago is 64.9%.

How many days does it rain in April in Chicago?

In April, in Chicago, the rain falls for 11.1 days. Throughout April, 3.6" (92.5mm) of precipitation is accumulated.

What is the last month it snows in Chicago?

April is the last month it regularly snows in Chicago. During 0.7 snowfall days, in April, Chicago aggregates 1" (25.4mm) of snow.

What is the water temperature in April in Chicago?

In Chicago, Illinois, the average seawater temperature in April is 41°F (5°C). Swimming in 41°F (5°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the average UV index in April in Chicago?

In Chicago, the average UV index in April is 6.
Average temperature in April - Chicago, IL
  • Average high temperature in April: 59.2°F

The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (31.5°F).

  • Average low temperature in April: 41.7°F

The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (18.2°F).

Average humidity in April - Chicago, IL
  • Average humidity in April: 64.9%

The month with the highest relative humidity is December (75.5%).
The month with the lowest relative humidity is May (64.1%).

Average rainfall in April - Chicago, IL
  • Average rainfall in April: 3.6"

Wettest months (with the highest rainfall) are May and June (4.1").
The driest month (with the lowest rainfall) is February (1.9").

Average rainfall days in April - Chicago, IL
  • Average rainfall days in April: 11.1 days

The month with the highest number of rainy days is May (11.4 days).
The month with the lowest number of rainy days is September (8.2 days).

Average snowfall in April - Chicago, IL
  • Average snowfall in April: 1"

The month with the highest snowfall is January (11.5").
Months with the lowest snowfall are May, June, July, August and September (0").

Average snowfall days in April - Chicago, IL
  • Average snowfall days in April: 0.7 days

The month with the highest number of snowfall days is January (8.1 days).
Months with the lowest number of snowfall days are May, 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: 7.2h

The month with most sunshine is June (Average sunshine: 10.4h).
The month with least sunshine is December (Average sunshine: 3.4h).

Average UV index in April - Chicago, IL
  • Average UV index in April: 6

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January and December (UV index 1).

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