Temperature in Illinois in May

Daytime highs, nighttime lows and the warmest cities in Illinois, the United States of America this May.

Illinois, the United States of America, a region in the United States of America, experiences maximum daytime temperatures in May ranging from 18°C (64°F) in Zion to 25°C (77°F) in Metropolis. Nighttime temperatures generally drop to 14°C (57°F) in Metropolis and 9°C (48°F) in Zion.

What is the temperature of the different cities in Illinois, the United States of America in May?

Discover the typical May temperatures for the most popular locations of Illinois on the map below. Detailed insights are just a click away.

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Check the conditions for any month of the year.

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For a detailed overview over the year and the best time to visit Illinois, check out our Illinois's climate page.

See also: Illinois weather by month.

Best Places to Visit in Illinois in May

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Illinois.

Conditions Temperatures Precipitation
Avg daytime high -5°C (23°F) cold → 32°C (90°F) hot

Marker color shows the average daytime high temperature in May: blue is cold, red is hot.

See all May weather averages, cities and regions in Illinois

Illinois temperatures in May: frequently asked questions

How hot does it get in Illinois, the United States of America in May?

Chicago averages a daytime high of 21°C (70°F) in May, which is pleasant for Illinois, the United States of America.

How cold does it get at night in Illinois, the United States of America in May?

Nighttime temperatures in Chicago typically drop to around 11°C (52°F) in May.

What is the warmest city in May in Illinois, the United States of America?

Based on our systematic data collection, Metropolis has been identified as the city with the highest average temperatures. The daytime temperature usually hovers around 25°C (77°F), while at night it goes down to an approximate temperature of 14°C (57°F).

What is the coldest city in May in Illinois, the United States of America?

For the month of May, Zion is the most temperate city in Illinois, the United States of America based on our records. Highs average 18°C (64°F) and nighttime temperatures dip to around 9°C (48°F).

How much sun does Illinois, the United States of America get in May?

The weather is predominantly sunny, with an estimated total of around 282 hours of sunshine in Chicago. This means many sunny days, which creates a cheerful atmosphere during this month.

Interested in more climate information?

We have much more information about the climate in Illinois.

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