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Weather in May in Illinois

Considering a trip to Illinois this May and wondering about the expected weather conditions? Find all the crucial information you need right here, addressing your question:

What is the weather like in Illinois in May?

Illinois is a region in the United States of America. May in Illinois generally has temperatures that range from pleasant to warm, with precipitation levels ranging from moderate to high.

Temperatures

The average maximum daytime temperatures vary from pleasant in Zion at 18°C to warm in Metropolis at 25°C. Nighttime temperatures generally drop to 14°C in Metropolis and 9°C in Zion.

Precipitation

In May, precipitation varies across different areas. From moderate rainfall in Freeport with an average of 90 mm to high rainfall in Sparta with 148 mm.

Average sunshine

Meanwhile, Chicago enjoys close to 282 hours of sunlight. This means it's a great month if you prefer bright and sunny days.

For a closer look at May's conditions in Illinois, see the map below. For a more detailed look at Illinois's yearly weather, check out our Illinois climate page.

Where to go in Illinois in May

Find more information for the most popular destinations in the Illinois on the map below. Click on a destination dot for more detailes.

Map not visible? Whoops sorry! Please refresh the page.
Legend perfect weather pleasant tolerable unpleasant poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

Popular destinations

What is the weather like in May for the 5 most popular destinations in Illinois?

Chicago

In May Chicago generally has pleasant temperatures with maximum daytime temperatures around 21°C, minimum nighttime temperatures around 11°C and high monthly rainfall. So on average the conditions are pleasant that month.

Chicago
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   April April
<<  
15°C 
4°C 
217 hours 
102 mm 
13 days 
21°C 
11°C 
282 hours 
118 mm 
12 days 
June   >> June
>>  
26°C 
16°C 
311 hours 
126 mm 
14 days 
Climate in Chicago

Schaumburg

In May Schaumburg generally has pleasant temperatures with maximum daytime temperatures around 22°C, minimum nighttime temperatures around 9°C and high monthly rainfall. So on average the conditions are pleasant that month.

Schaumburg
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   April April
<<  
15°C 
3°C 
217 hours 
102 mm 
13 days 
22°C 
9°C 
282 hours 
103 mm 
13 days 
June   >> June
>>  
27°C 
15°C 
311 hours 
124 mm 
14 days 
Climate in Schaumburg

Rosemont

In May Rosemont generally has pleasant temperatures with maximum daytime temperatures around 21°C, minimum nighttime temperatures around 11°C and high monthly rainfall. So on average the conditions are pleasant that month.

Rosemont
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   April April
<<  
15°C 
4°C 
217 hours 
101 mm 
12 days 
21°C 
11°C 
282 hours 
117 mm 
12 days 
June   >> June
>>  
26°C 
16°C 
311 hours 
126 mm 
14 days 
Climate in Rosemont

Joliet

In May Joliet generally has high temperatures with maximum daytime temperatures around 22°C, minimum nighttime temperatures around 10°C and high monthly rainfall. So on average the conditions are pleasant that month.

Joliet
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   April April
<<  
16°C 
4°C 
217 hours 
99 mm 
13 days 
22°C 
10°C 
282 hours 
113 mm 
13 days 
June   >> June
>>  
27°C 
16°C 
311 hours 
133 mm 
15 days 
Climate in Joliet

Naperville

In May Naperville generally has high temperatures with maximum daytime temperatures around 22°C, minimum nighttime temperatures around 10°C and high monthly rainfall. So on average the conditions are pleasant that month.

Naperville
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   April April
<<  
16°C 
3°C 
217 hours 
105 mm 
13 days 
22°C 
10°C 
282 hours 
117 mm 
13 days 
June   >> June
>>  
27°C 
15°C 
311 hours 
123 mm 
14 days 
Climate in Naperville

Is your destination not in the list? Have a look at other destinations in Illinois, in the United States of America.

Is May the best time to visit Illinois?

In our opinion, May is a good time to visit Illinois with overall pleasant weather in Chicago.

Generally speaking, the best visiting conditions can be found in September offering mostly perfect weather in Chicago. The weather in January, February, March, November and December, on the other hand, tends to be poor.

Interested in more climate information?

We have much more information about the climate in Illinois. Interested in the weather conditions in a specific month? Select the month below.

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  • Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.

    Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.