Get Exclusive App Deals
  1. Home
  2. United States
  3. Illinois
  4. DeKalb County

DeKalb County

Travel Info

Top 10 Must-Do Experiences and Attractions in DeKalb County

Latest launches and promotions in DeKalb County

Recommended travel destinations near DeKalb County

More destinations

DeKalb County Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

DeKalb County year round climate

  • Spring (March–May): Average 37–62°F, mild climate, but early spring can be cold, more rainfall, especially in April. Common activities: Outdoor walks (be mindful of weather changes), flower viewing (if suitable flowers are available locally). Recommended clothing: Layered clothing, jacket, thermal underwear, long-sleeved shirts.
  • Summer (June–August): Average 69–71°F, warm and humid, most rainfall in July. Common activities: Outdoor activities (be mindful of sun protection and rain), swimming (if suitable facilities are available locally). Recommended clothing: Light and breathable clothing, rain gear.
  • Autumn (September–November): Average 52–64°F, pleasant climate, rainfall gradually decreases. Common activities: Hiking, autumn leaf viewing (if suitable tree species are available locally). Recommended clothing: Comfortable long-sleeved shirts, jacket.
  • Winter (December–February): Average -5.4–-33.6°F, cold and dry, low probability of snowfall, but low temperatures. Common activities: Indoor activities, skiing (if there are ski resorts nearby). Recommended clothing: Warm clothing, thick jacket, hat, gloves, scarf.

DeKalb County climatological average

Annual average temperature: approx. 50.0°F / Annual rainfall: approx. 1147 mm / Summer humidity: 65%–75% / Rainiest month: July

DeKalb County monthly average temperature and precipitation

Month
Air temperature (°F)
Precipitation (mm)
January
22.3°F
51.5
February
29.8°F
61.3
March
37.9°F
108.2
April
48.2°F
128.2
May
62.1°F
106.7
June
70.5°F
95
July
71.6°F
160.6
August
69.8°F
140.8
September
64.8°F
118.9
October
52.5°F
62.9
November
39.9°F
53.4
December
30.4°F
60.3

DeKalb County weather for the next seven days

3/15
Sunday
Heavy rain
56.5°F/32.2°F
3/16
Monday
Moderate or heavy snow showers
24.8°F/12°F
3/17
Tuesday
Cloudy
28°F/11.8°F
3/18
Wednesday
Moderate or heavy snow showers
45.7°F/24.6°F
3/19
Thursday
Cloudy
49.5°F/25.1°F
3/20
Friday
Fog
59.2°F/38.5°F
3/21
Saturday
Cloudy
66.5°F/40.4°F

DeKalb County Frequently Asked Questions and Useful Information for Travel

What is the best time to visit?

The best time to visit is March, when the climate is cool and pleasant, perfect for participating in local festivals.

What are the must-visit attractions?

Millennium Park, Navy Pier and the Magnificent Mile are among the city's landmarks.