May weather forecast
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

The last month of the spring, May, is a comfortable month in Chicago, Illinois, with an average temperature fluctuating between 61°F (16.1°C) and 50.4°F (10.2°C).

Temperature

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

Humidity

In May, the average relative humidity in Chicago is 79%.

Rainfall

In May, the rain falls for 18.3 days. Throughout May, 4.61" (117mm) of precipitation is accumulated. Throughout the year, in Chicago, Illinois, there are 160.2 rainfall days, and 36.97" (939mm) of precipitation is accumulated.

Snowfall

January through May, November and December are months with snowfall in Chicago. May is the last month it regularly snows. During 0.2 snowfall days, Chicago aggregates 0.08" (2mm) of snow. Throughout the year, there are 40.9 snowfall days, and 13.9" (353mm) of snow is accumulated.

Ocean temperature

In May, the average ocean 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

The average length of the day in May is 14h and 34min.
On the first day of the month, sunrise is at 5:46 am and sunset at 7:49 pm. On the last day of May, in Chicago, sunrise is at 5:18 am and sunset at 8:18 pm CDT.

Sunshine

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

UV index

The average daily maximum UV index in May in Chicago is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: In May, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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 May in Chicago?

In Chicago, the average relative humidity in May is 79%.

How much does it rain in Chicago in May?

In Chicago, Illinois, in May, it is raining for 18.3 days, with typically 4.61" (117mm) of accumulated precipitation.

What is the last month it snows in Chicago?

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

What is the ocean temperature in May in Chicago?

In May, the average ocean temperature in Chicago 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.

What is the average length of the day in May in Chicago?

The average day length in May in Chicago, Illinois, is 14h and 34min.

What time are sunrise and sunset in May in Chicago?

In May, on the first day of the month, sunrise is at 5:46 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 5:18 am and sunset at 8:18 pm CDT.

How long on average sun shines in May in Chicago?

The average sunshine duration in May in Chicago is 8.9h.

What is the UV index reading in May in Chicago?

In Chicago, the average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unsafe exposure to Sun's UV rays.

Average temperature in May
Chicago, IL

Average temperature in May - Chicago, IL
  • Average high temperature in May: 61°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 May: 50.4°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).

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Average pressure in May
Chicago, IL

Average pressure in May - Chicago, IL
  • Average pressure in May: 29.97"

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 May
Chicago, IL

Average wind speed in May - Chicago, IL
  • Average wind speed in May: 9.4mph

The windiest month (with the highest average wind speed) is January (12.5mph).
The calmest month (with the lowest average wind speed) is July (7.7mph).

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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: 4.61"

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

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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: 0.08"

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

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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).
The 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: 44.8°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).

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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: 14h and 34min

The month with the longest days is June (Average daylight: 15h and 11min).
The month with the shortest days is December (Average daylight: 9h and 11min).

  • Average sunshine in May: 8.9h

The 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

The months with the highest UV index are July and August (UV index 6).
The 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).
The 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: 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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