May weather forecast and climate
Chicago, IL

The city of Chicago in Illinois on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street
The city of Chicago in Illinois on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street

Weather in May

May, the last month of the spring, in Chicago, is a comfortable month, with average temperature ranging between max 61°F (16.1°C) and min 50.4°F (10.2°C).

Temperature

In May, the average high-temperature increases, from a fresh 50.7°F (10.4°C) in April, to an enjoyable 61°F (16.1°C). In Chicago, the average low-temperature is 50.4°F (10.2°C).

Humidity

In May, the average relative humidity is 79%.

Rainfall

In May, in Chicago, the rain falls for 18.3 days. Throughout May, 4.61" (117mm) of precipitation is accumulated. 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. May is the last month it regularly snows in Chicago. During 0.2 snowfall days, Chicago aggregates 0.08" (2mm) of snow. In Chicago, during the entire year, snow falls for 40.9 days, and aggregates up to 13.9" (353mm) of snow.

Ocean temperature

In Chicago, the average seawater temperature is 45°F (7.2°C).
Note: Swimming in 45°F (7.2°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 May, the average length of the day in Chicago is 14.6h.

Sunshine

In May, the average sunshine is 8.9h.

UV index

The average daily maximum UV index in May is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to the UV radiation for the ordinary person.
Note: The daily maximum UV index of 4 in May interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 temperature in May in Chicago?

The average high-temperature, in May, in Chicago, Illinois, is 61°F (16.1°C), while the average low-temperature is 50.4°F (10.2°C).

What is the average humidity in May in Chicago?

The average relative humidity in May in Chicago, Illinois, is 79%.

How many days does it rain in May in Chicago?

In Chicago, Illinois, in May, during 18.3 rainfall days, 4.61" (117mm) of precipitation is typically accumulated.

What is the last month it snows in Chicago?

May is the last month it regularly snows in Chicago. During 0.2 snowfall days, in May, Chicago aggregates 0.08" (2mm) of snow.

How cold is the water in May in Chicago?

In May, the average ocean temperature in Chicago, Illinois, is 45°F (7.2°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 May?

In Chicago, Illinois, the average length of the day in May is 14.6h.

How many hours of sunshine does Chicago have in May?

In May, the average sunshine in Chicago, Illinois, is 8.9h.

What is the UV index reading in May in Chicago?

In May, the average daily maximum UV index in Chicago is 4. A UV Index reading of 3 to 5 represents a medium health risk from the exposure to the Sun's UV rays.

Average temperature in May
Chicago, IL

Average temperature in May - Chicago, IL
  • Average high temperature in May: 16.1°C

The warmest month (with the highest average high temperature) is August (25.3°C).
The month with the lowest average high temperature is January (-1.3°C).

  • Average low temperature in May: 10.2°C

The month with the highest average low temperature is July (19.9°C).
The coldest month (with the lowest average low temperature) is January (-6.3°C).

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Average pressure in May
Chicago, IL

Average pressure in May - Chicago, IL
  • Average pressure in May: 1014.8mbar

The month with the highest atmospheric pressure is January (1019.5mbar).
The month with the lowest atmospheric pressure is June (1013.3mbar).

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Average wind speed in May
Chicago, IL

Average wind speed in May - Chicago, IL
  • Average wind speed in May: 15.1km/h

The windiest month (with the highest average wind speed) is January (20.1km/h).
The calmest month (with the lowest average wind speed) is July (12.4km/h).

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Average humidity in May
Chicago, IL

Average humidity in May - Chicago, IL
  • Average humidity in May: 79%

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

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Average rainfall in May
Chicago, IL

Average rainfall in May - Chicago, IL
  • Average rainfall in May: 117mm

The wettest month (with the highest rainfall) is June (124mm).
The driest month (with the least rainfall) is December (42mm).

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Average rainfall days in May
Chicago, IL

Average rainfall days in May - Chicago, IL
  • Average rainfall days in May: 18.3 days

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

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Average snowfall in May
Chicago, IL

Average snowfall in May - Chicago, IL
  • Average snowfall in May: 2mm

The month with the highest snowfall is February (90mm).
Months with the least snowfall are June, July, August, September and October (0mm).

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Average snowfall days in May
Chicago, IL

Average snowfall days in May - Chicago, IL
  • Average snowfall days in May: 0.2 days

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

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Average sea temperature in May
Chicago, IL

Average sea temperature in May - Chicago, IL
  • Average sea temperature in May: 7.2°C

The best month for swimming (with the highest average sea temperature) is August (23.3°C).
The coldest month (with the lowest average sea temperature) is February (2.7°C).

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Average daylight in May /
Average sunshine in May
Chicago, IL

Average daylight in May / Average sunshine in May - Chicago, IL
  • Average daylight in May: 14.6h

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 May: 8.9h

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

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Average sunshine days in May
Chicago, IL

Average sunshine days in May - Chicago, IL
  • Average sunshine days in May: 10.6 days

The month with the most sunshine days is December (15.5 days).
The month with the least sunshine days is July (9.3 days).

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Average UV index in May
Chicago, IL

Average UV index in May - Chicago, IL
  • Average UV index in May: 4

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).

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Average cloud cover in May
Chicago, IL

Average cloud cover in May - Chicago, IL
  • Average cloud cover in May: 41

The month with the most cloud cover is January (Cloud cover 62).
Months with the least cloud cover are July and August (Cloud cover 27).

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Average visibility in May
Chicago, IL

Average visibility in May - Chicago, IL
  • Average visibility in May: 9km

Months with the highest visibility are September and October (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, November and December (9km).

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