Live Weather & Forecast
Weather in Waterloo
Illinois, United States · Real-time conditions & 3-day outlook
24°C
Feels like 25°C
75°F / Feels 77°F
Overcast
Waterloo, Illinois
🌞 Daytime
Updated: 2026-04-12 19:15
Humidity
45%
Wind
30.2 km/h SSW
Wind Gust
51.3 km/h
Pressure
1012 mb
Visibility
16 km
UV Index
0.1
(Low)
Precipitation
0 mm
Cloud Cover
100%
Dew Point
13°C
Wind Degree
192°
Air Quality Index
US EPA: Good
UK DEFRA: Low (1)
CO
143.9 μg/m³
NO₂
4.3 μg/m³
O₃
106 μg/m³
SO₂
2.3 μg/m³
PM 2.5
3.8 μg/m³
PM 10
4 μg/m³
Weather Alerts 1
Met
· Moderate · Expected
Special Weather Statement issued April 12 at 12:21AM CDT by NWS Paducah KY
Elevated conditions for wildfires are expected this afternoon, mainly between 12 PM and 7 PM CDT. Relative humidity values will fall to 25 to 35% this afternoon, and winds will be breezy from the south, sustained at 10 to 15 mph with gusts of 25 to 30 mph forecast. Vegetation is dry due to ongoing moderate to severe drought conditions over much of the region. Outdoor burning and activities that i...
Today's Hourly Forecast
24-hour breakdown for Waterloo, Illinois
12 AM
17°
Clear
1 AM
17°
Clear
2 AM
16°
Clear
3 AM
16°
Clear
4 AM
16°
Clear
5 AM
16°
Clear
6 AM
15°
Clear
7 AM
16°
Sunny
8 AM
18°
Sunny
9 AM
20°
Sunny
10 AM
23°
Sunny
11 AM
25°
Sunny
12 PM
27°
Sunny
1 PM
27°
Sunny
2 PM
27°
Sunny
3 PM
26°
Patchy rain nearby
4 PM
26°
Patchy rain nearby
5 PM
25°
Patchy rain nearby
6 PM
25°
Patchy rain nearby
7 PM
24°
Overcast
8 PM
21°
Clear
9 PM
20°
Patchy rain nearby
10 PM
19°
Clear
11 PM
19°
Clear
3-Day Forecast
Daily overview for Waterloo, Illinois
Today
Patchy rain nearby
28°
/
15°
🌧️ 85% chance of rain
💧 Avg. humidity: 66%
💨 Max wind: 32.8 km/h
🌧️ Total precip: 0.43 mm
☀️ UV Index: 1.5
🌅 Sunrise: 06:29 AM
🌇 Sunset: 07:35 PM
🌙 Waning Crescent
🌑 Moon: 33% lit
Mon, Apr 13
Thundery outbreaks in nearby
26°
/
17°
🌧️ 0% chance of rain
💧 Avg. humidity: 79%
💨 Max wind: 29.2 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.9
🌅 Sunrise: 06:27 AM
🌇 Sunset: 07:36 PM
🌙 Waning Crescent
🌑 Moon: 23% lit
Tue, Apr 14
Overcast
25°
/
20°
🌧️ 0% chance of rain
💧 Avg. humidity: 77%
💨 Max wind: 28.4 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 2
🌅 Sunrise: 06:26 AM
🌇 Sunset: 07:36 PM
🌙 Waning Crescent
🌑 Moon: 15% lit
Best Time to Visit Waterloo
Plan your trip to Waterloo, United States around the most favorable weather conditions.
Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
Frequently Asked Questions
What is the current weather in Waterloo?
Current conditions in Waterloo: Overcast, temperature 24°C, humidity 45%.
What is the best time to visit Waterloo?
The best time to visit Waterloo is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Waterloo?
Waterloo is located at approximately 38.3° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Waterloo?
The wettest period in Waterloo is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Waterloo?
For visits to Waterloo during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Waterloo in?
Waterloo is located in United States, in the state of Illinois.
What are the public holidays in Waterloo in 2026?
View the 2026 public holidays for Waterloo on our Holidays page.
What are the GPS coordinates used for the weather forecast in Waterloo?
The weather forecast for Waterloo uses coordinates 38.3359, -90.1498.