Illinois
Illinois is an important state in the Midwestern United States. Famous attractions include Chicago's Millennium Park. Millennium Park is a vibrant public space that houses the Frank Gehry-designed open-air concert hall, the Cloud Gate sculpture and the Crown Fountain. These attractions not only attract locals, but are also must-visit places for out-of-town tourists. Illinois’ food and culture are also worth exploring.
Illinois Top 10 Activities
Top things to do in Illinois
Popular Activities in Illinois
Recommended travel destinations near Illinois
Best time to visit Illinois
Data source: Meteostat・Last updated: 2025-09
Weather in Illinois throughout the year
Spring (March–May): Average 6.7–19.6°C, gradually warming climate with abundant rainfall, but significant temperature fluctuations. Common activities: Outdoor excursions, flower viewing. Recommended clothing: Layered clothing, jacket, long-sleeved shirts, comfortable shoes.
Summer (June–August): Average 23.9–24.3°C, hot and humid with higher rainfall, occasional thunderstorms. Common activities: Swimming, camping, outdoor BBQ. Recommended clothing: Light and breathable clothing, sun hat, sunglasses.
Autumn (September–November): Average 19.8–6.8°C, gradually decreasing temperatures, pleasant weather, reduced rainfall. Common activities: Maple viewing, hiking, harvesting crops. Recommended clothing: Comfortable long-sleeved shirts, light jacket, warm clothing.
Winter (December–February): Average -1.8–2.0°C, cold and dry, snowfall varies by year. Common activities: Skiing, ice skating, indoor activities. Recommended clothing: Warm clothing, thick jacket, hat, gloves, scarf.
Weather in Illinois
Annual average temperature: approx. 12.6°C / Annual rainfall: approx. 1179 mm / Summer humidity: 60%–75% / Rainiest month: August
Illinois weather by month
| Month | January | February | March | April | May | June | July | August | September | October | November | December |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temperature | -1.8°C | 1.5°C | 6.7°C | 12.1°C | 19.6°C | 23.9°C | 24.3°C | 23.2°C | 19.8°C | 13.4°C | 6.8°C | 2°C |
| Rainfall (mm) | 69.9 | 92.4 | 121.3 | 113.8 | 108 | 114.6 | 151.9 | 163.7 | 53.4 | 61.5 | 80.9 | 48.4 |
7-day weather forecast for Illinois
| Date | 11/5Thursday | 11/6Friday | 11/7Saturday | 11/8Sunday | 11/9Monday | 11/10Tuesday | 11/11Wednesday |
|---|---|---|---|---|---|---|---|
| Weather |  Patchy rain nearby |  Sunny | Sunny | Sunny | Sunny | Sunny |  Partly Cloudy |
| High | 13.4°C | 9.9°C | 10.8°C | 16°C | 19.6°C | 17.4°C | 15.3°C |
| Low | 8.1°C | 3.4°C | 0.9°C | 3°C | 5.8°C | 7.9°C | 5.2°C |
