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Illinois Weather and climate
Data source：Meteostat
Update date：2025-09
Illinois year round climate
- 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.
Illinois climatological average
Annual average temperature: approx. 12.6°C / Annual rainfall: approx. 1179 mm / Summer humidity: 60%–75% / Rainiest month: August
Illinois monthly average temperature and precipitation
Month
Air temperature (°C)
Precipitation (mm)
January
-1.8°C
69.9
February
1.5°C
92.4
March
6.7°C
121.3
April
12.1°C
113.8
May
19.6°C
108
June
23.9°C
114.6
July
24.3°C
151.9
August
23.2°C
163.7
September
19.8°C
53.4
October
13.4°C
61.5
November
6.8°C
80.9
December
2°C
48.4
Illinois weather for the next seven days
10/13
Monday
Sunny
24.9°C/13.4°C
10/14
Tuesday
Overcast
21.1°C/17°C
10/15
Wednesday
Overcast
18.4°C/14.3°C
10/16
Thursday
Sunny
25°C/12.4°C
10/17
Friday
Sunny
26.5°C/14.9°C
10/18
Saturday
Patchy rain nearby
28.1°C/16.1°C
10/19
Sunday
Sunny
18.6°C/10.2°C
