May Rainfall and Precipitation in Illinois
Average rainfall, rainy days and the driest cities in Illinois, the United States of America in May.
Select a Month
Check the conditions for any month of the year.
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.
Monthly precipitation
0 mm (0 in) dry → 150 mm (5.9 in) wet
Marker color shows total monthly precipitation in May: pale blue is dry, deep blue is wet.
Illinois precipitation in May: frequently asked questions
How much rainfall does Illinois, the United States of America receive in May?
In May, Chicago typically experiences high rainfall, averaging about 118 mm (4.6 in). This translates to a mix of wet and dry days throughout the month.
How many days does it rain in Illinois, the United States of America in May?
Rainfall in Chicago typically falls on roughly 12 days days in May.
Is May part of the rainy season in Illinois, the United States of America?
May is generally a drier month for Illinois, the United States of America, falling outside the main rainy season.
What is the wettest city in May in Illinois, the United States of America?
Sparta is the wettest city in Illinois, the United States of America in May according to our database, with average rainfall of around 148 mm (5.8 in).
What is the driest city in May in Illinois, the United States of America?
Based on our database, Freeport sees the least rainfall in Illinois, the United States of America in May, with around 90 mm (3.5 in) on average.
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.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
The 10 most alternative cities in the United States
Discover the top 10 fun and alternative U.S. cities rich in art, culture, and adventure. From Portland's hippy charm to Sedona's stunning landscapes.
Sedona: Explore Majestic Red Rock Landscapes
A picturesque artists' town surrounded by red rocks and known for its spirituality, vortex energy, and stunning hikes like Cathedral Rock.
10 most idyllic villages to visit in the United States
Discover 10 idyllic villages in the USA, from California to Vermont. Explore their unique charm, rich history, stunning nature, and vibrant arts scenes.