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Travel Info
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Travel Info

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Illinois Weather, Climate and Best Time to Visit

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

12/16
Tuesday
Sunny
5.1°C/-10°C
12/17
Wednesday
Mist
0°C/-2.4°C
12/18
Thursday
Patchy rain nearby
6.1°C/0.4°C
12/19
Friday
Partly Cloudy
0.3°C/-6.8°C
12/20
Saturday
Sunny
7.7°C/-1.4°C
12/21
Sunday
Sunny
3.9°C/-3.4°C
12/22
Monday
Partly Cloudy
2.6°C/-3.9°C

Illinois Frequently Asked Questions and Useful Information for Travel

What are the top tourist attractions in Illinois?

Some of the most popular tourist attractions in Illinois include The Art Institute of Chicago, Millennium Park, The Magnificent Mile, the Museum of Science and Industry, and the Skydeck Chicago at Willis Tower.

Why do tourists visit Illinois?

Tourists are drawn to Illinois for Chicago's iconic skyline, world-class museums, exceptional architecture, diverse culinary scene, and vibrant cultural offerings. Beyond the city, visitors can explore picturesque outdoor landscapes, family-friendly adventures, and excellent shopping.

What are some of the prettiest places in Illinois?

Illinois offers several beautiful locations such as Ferne Clyffe Waterfalls, the charming town of Woodstock, the historic streets of Galena, the architecturally stunning Bahá'í House of Worship, and the natural beauty of Starved Rock State Park.

When is the best month to visit Illinois?

The ideal months to experience Illinois and Chicago are April and May, before the peak summer crowds arrive. For those interested in major festivals like Chicago Pride or the Chicago Blues Festival, planning a visit between June and August is recommended.

What are some unique outdoor escapes in Illinois?

Illinois boasts numerous outdoor attractions, including the scenic beauty of Starved Rock State Park for hiking and exploring canyons, the expansive beaches and trails around Lake Michigan, and the diverse wildlife viewing opportunities in state parks like Pere Marquette.