Chicago

Illinois Weather in May

Average temperatures, rainfall, sunshine and the best places to visit in Illinois, the United States of America in May.

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Chicago Schaumburg Rosemont Joliet

Planning a getaway to Illinois, the United States of America this May and curious about the weather you should prepare for? Discover all the vital details you need on this page, solving your puzzle:

What to Expect in Illinois in May

Illinois, the United States of America 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 (64°F) to warm in Metropolis at 25°C (77°F). Nighttime temperatures generally drop to 14°C (57°F) in Metropolis and 9°C (48°F) in Zion.

For specific regional insights in Illinois, the United States of America, refer to the map provided below.

Precipitation

In May, precipitation varies across different areas. From moderate rainfall in Freeport with an average of 90 mm (3.5 in) to high rainfall in Sparta with 148 mm (5.8 in).

Average sunshine

Sunshine is generally plentiful throughout many areas. Chicago enjoys about 282 hours of sunlight, ideal for those seeking sunny weather.

Explore Illinois by month

Pick a month to see the average temperature, rainfall and sunshine in Illinois — and find the best time to visit. (based on Chicago)

January-1°C (30°F) February0°C (32°F) March8°C (46°F) April15°C (59°F) May21°C (70°F) June26°C (79°F) This monthJuly29°C (84°F) August28°C (82°F) September24°C (75°F) October17°C (63°F) November9°C (48°F) December3°C (37°F)
Best Time to Visit Illinois →

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
perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Illinois

What is the weather like in May for some of the most popular destinations in Illinois, the United States of America?

Temperature range in Illinois (May)

Precipitation variation in Illinois (May)

Chicago

In May Chicago generally has pleasant temperatures with maximum daytime temperatures around 21°C (70°F), minimum nighttime temperatures around 11°C (52°F) and high monthly rainfall. So on average the conditions are pleasant that month.

« April
May
June »
April
May
June
Max temperature
15°C (59°F)
21°C (70°F)
26°C (79°F)
Min temperature
4°C (39°F)
11°C (52°F)
16°C (61°F)
Monthly sun hours
217 hours
282 hours
311 hours
Monthly rainfall
102 mm (4 in)
118 mm (4.6 in)
126 mm (5 in)
Monthly rainy days
13 days
12 days
14 days
Weather conditions
unpleasant
pleasant
pleasant
Climate in Chicago →

Schaumburg

In May Schaumburg generally has pleasant temperatures with maximum daytime temperatures around 22°C (72°F), minimum nighttime temperatures around 9°C (48°F) and high monthly rainfall. So on average the conditions are pleasant that month.

« April
May
June »
April
May
June
Max temperature
15°C (59°F)
22°C (72°F)
27°C (81°F)
Min temperature
3°C (37°F)
9°C (48°F)
15°C (59°F)
Monthly sun hours
217 hours
282 hours
311 hours
Monthly rainfall
102 mm (4 in)
103 mm (4.1 in)
124 mm (4.9 in)
Monthly rainy days
13 days
13 days
14 days
Weather conditions
unpleasant
pleasant
pleasant
Climate in Schaumburg →

Rosemont

In May Rosemont generally has pleasant temperatures with maximum daytime temperatures around 21°C (70°F), minimum nighttime temperatures around 11°C (52°F) and high monthly rainfall. So on average the conditions are pleasant that month.

« April
May
June »
April
May
June
Max temperature
15°C (59°F)
21°C (70°F)
26°C (79°F)
Min temperature
4°C (39°F)
11°C (52°F)
16°C (61°F)
Monthly sun hours
217 hours
282 hours
311 hours
Monthly rainfall
101 mm (4 in)
117 mm (4.6 in)
126 mm (5 in)
Monthly rainy days
12 days
12 days
14 days
Weather conditions
unpleasant
pleasant
pleasant
Climate in Rosemont →

Joliet

In May Joliet generally has high temperatures with maximum daytime temperatures around 22°C (72°F), minimum nighttime temperatures around 10°C (50°F) and high monthly rainfall. So on average the conditions are pleasant that month.

« April
May
June »
April
May
June
Max temperature
16°C (61°F)
22°C (72°F)
27°C (81°F)
Min temperature
4°C (39°F)
10°C (50°F)
16°C (61°F)
Monthly sun hours
217 hours
282 hours
311 hours
Monthly rainfall
99 mm (3.9 in)
113 mm (4.4 in)
133 mm (5.2 in)
Monthly rainy days
13 days
13 days
15 days
Weather conditions
tolerable
pleasant
pleasant
Climate in Joliet →

Naperville

In May Naperville generally has high temperatures with maximum daytime temperatures around 22°C (72°F), minimum nighttime temperatures around 10°C (50°F) and high monthly rainfall. So on average the conditions are pleasant that month.

« April
May
June »
April
May
June
Max temperature
16°C (61°F)
22°C (72°F)
27°C (81°F)
Min temperature
3°C (37°F)
10°C (50°F)
15°C (59°F)
Monthly sun hours
217 hours
282 hours
311 hours
Monthly rainfall
105 mm (4.1 in)
117 mm (4.6 in)
123 mm (4.8 in)
Monthly rainy days
13 days
13 days
14 days
Weather conditions
unpleasant
pleasant
pleasant
Climate in Naperville →

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

Popular cities in May

Day & night temperatures, rainfall and average weather in Illinois in May.

City Weather Day temp Night temp Rainfall
Chicago 21°C (70°F) 11°C (52°F) 118 mm (4.6 in)
Schaumburg 22°C (72°F) 9°C (48°F) 103 mm (4.1 in)
Rosemont 21°C (70°F) 11°C (52°F) 117 mm (4.6 in)
Joliet 22°C (72°F) 10°C (50°F) 113 mm (4.4 in)
Naperville 22°C (72°F) 10°C (50°F) 117 mm (4.6 in)
Waukegan 19°C (66°F) 9°C (48°F) 98 mm (3.9 in)

Illinois weather in May: frequently asked questions

What is the weather like in Illinois, the United States of America in May?

Illinois, the United States of America typically experiences pleasant weather in May, part of the season. Daytime highs in Chicago average around 21°C (70°F), and temperatures drop to about 11°C (52°F) at night.

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

Daytime temperatures in Chicago peak at roughly 21°C (70°F) in May, dropping to about 11°C (52°F) overnight.

Does Illinois, the United States of America get a lot of rain in May?

Yes, May tends to be a wetter month in Illinois, the United States of America. Average rainfall in Chicago sits around 118 mm (4.6 in).

Is May a Good Time to Visit Illinois, the United States of America?

In our opinion, May is a good time to visit Illinois, the United States of America 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.

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.

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