June weather forecast and climate
Illinois, USA

Flag of Illinois, USA
Flag of Illinois, USA

Weather in June

June is the beginning of the warm to the hot summer season in Illinois as the landscape bathes in bright sunshine. The average high temperatures are in the warm 75°F (23.9°C) to hot 85°F (29.4°C) range, while average low temperatures hover in the mild 55°F (12.8°C) to 65°F (18.3°C). Alton and Cahokia in central Illinois, register average temperatures in the 65°F (18.3°C) to 85°F (29.4°C) range.
The longest days of the year provide ample daylight for hiking, biking, and camping. Forests and state parks see the heaviest footfalls even though June brings heavy rain. No matter the location, there is a state park, forest, or woody area nearby to explore and hike. Occasional hailstorms accompany heavy rainfall to damage crops in many parts of the state.
Sweatshirts and t-shirts provide comfort during the day when the heat and humidity are high. Carry adequate rain protection on outdoor trips, especially when camping for the night. Keep an eye on the weather for tornadoes in June in Illinois.
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