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DeKalb County

Travel Info

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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 3.3–16.7°C, 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 21.0–22.0°C, 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 11.4–18.2°C, 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–-0.9°C, 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. 10°C / Annual rainfall: approx. 1147 mm / Summer humidity: 65%–75% / Rainiest month: July

DeKalb County monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
-5.4°C
51.5
February
-1.2°C
61.3
March
3.3°C
108.2
April
9°C
128.2
May
16.7°C
106.7
June
21.4°C
95
July
22°C
160.6
August
21°C
140.8
September
18.2°C
118.9
October
11.4°C
62.9
November
4.4°C
53.4
December
-0.9°C
60.3

DeKalb County weather for the next seven days

1/28
Wednesday
Sunny
-5.3°C/-17.7°C
1/29
Thursday
Sunny
-7.5°C/-16.7°C
1/30
Friday
Partly Cloudy
-10.7°C/-17.8°C
1/31
Saturday
Sunny
-6.7°C/-15.5°C
2/1
Sunday
Sunny
-4°C/-12.7°C
2/2
Monday
Partly Cloudy
0.9°C/-8.6°C
2/3
Tuesday
Cloudy
-1.8°C/-7.1°C

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.