Illinois by month · 5 of 12
Illinois RV rental in May
May falls inside Illinois's best RV window (May to October).
Mild summers and colorful falls are ideal; winters are cold with lake-effect snow near Chicago and occasional ice storms.
PickRV
Published by PickRV
May on the ground
Weather & conditions
Typical 72°F high / 51°F low
Full green spring, mild and bright — the prairie state's underrated best-of month before summer humidity. Everything from Galena to the Shawnee works.
What to do in May
- Bluff-country drives around Galena
- Prairie wildflowers coming into bloom
- First warm camping weekends statewide
Best-fit rigs: Motorhome · Truck or van
Know before you go
May through July is peak severe-weather season — keep a reliable forecast source in camp.
Severe thunderstorms and tornadoes are possible May through July. Winter road conditions can deteriorate quickly.
From the verified event registry
May events in Illinois
No verified large-scale May events in our Illinois registry yet — we only list events we can date and source, never filler. The full calendar tracks what's confirmed.
Illinois events calendarTrip notes
May tips for Illinois
Layer up: shoulder-pattern days can swing from a chilly dawn to t-shirt warmth by afternoon.
Pack rain gear and leveling mats for soft or wet sites.
Carry a weather radio and check forecasts daily — transitional months turn fast.
Keep planning
Plan the Illinois trip
Nearby & related
Keep planning Illinois
Sourced costs, campground directories, and the places worth a detour — the next layer of Illinois trip planning.