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

May 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
May is a warm spring month in Chicago with pleasant temperatures in the average range of 48°F (8.9°C) to 70°F (21.1°C). Days are routinely above 50°F (10°C), and some even register 80°F (26.7°C), while nights invariably tend to be above 40°F (4.4°C).
The sunlight lasts for 262 hours as the days stretch beyond 14 hours. The skies are mostly cloudy due to the persistent wet conditions with 3.7" (94mm) of rainfall in May.
While the flowers blossom in the lovely weather, spring is a season of surprises, and it is a good idea to carry raincoats or jackets to shield from sudden outbursts of rain.
  • Average high temperature in May: 70.2°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 May: 51.6°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 May: 64.1%

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 May: 4.1"

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 May: 11.4 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 May: 0"

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 May: 0 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 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).

  • Average daylight in May: 15.6h

The month with the longest days is June (Average daylight: 16.3h).
The month with shortest days is December (Average daylight: 10.2h).

  • Average sunshine in May: 9.1h

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 May: 7

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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