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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 44–67°F, 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 75–75°F, 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 67–44°F, 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 -35–35°F, 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. 54.7°F / Annual rainfall: approx. 1179 mm / Summer humidity: 60%–75% / Rainiest month: August

Illinois monthly average temperature and precipitation

Month
Air temperature (°F)
Precipitation (mm)
January
28.8°F
69.9
February
34.7°F
92.4
March
44.1°F
121.3
April
53.8°F
113.8
May
67.3°F
108
June
75°F
114.6
July
75.7°F
151.9
August
73.8°F
163.7
September
67.6°F
53.4
October
56.1°F
61.5
November
44.2°F
80.9
December
35.6°F
48.4

Illinois weather for the next seven days

12/18
Thursday
Moderate rain
55.8°F/29.2°F
12/19
Friday
Partly Cloudy
28.2°F/18.5°F
12/20
Saturday
Overcast
41°F/27.1°F
12/21
Sunday
Light freezing rain
41.8°F/27°F
12/22
Monday
Patchy rain nearby
42.2°F/30.7°F
12/23
Tuesday
Sunny
51.7°F/37.6°F
12/24
Wednesday
Patchy rain nearby
62.7°F/44.4°F

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.