Waterloo, IL Weather Forecast
Local 7-day forecast
Areas Of Fog then Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Waterloo, IL in one place.
Areas of fog before 9am. Mostly sunny, with a high near 82. Southeast wind around 2 mph.
Local Weather Overview
This forecast page for Waterloo, IL is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Aug 23, 2026 5:08 PM CDT.
The active forecast window currently covers Aug 24 to Aug 29, 2026 for Waterloo, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Aug 24 to Aug 29, 2026
- Latest sync
- Aug 23, 2026 5:08 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Waterloo
Wednesday looks like the warmest upcoming period in Waterloo at 88 degrees F.
Monday Night is the coolest period ahead with temperatures near 60 degrees F.
The strongest winds are forecast for Thursday at about 3 to 7 mph NW.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 23, 2026 5:08 PM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- LSX
- Radar station
- KLSX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 60. East wind around 3 mph.
Mostly sunny, with a high near 84. East wind around 5 mph.
Partly cloudy, with a low around 67.
Mostly sunny, with a high near 88.
A slight chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 67. Chance of precipitation is 20%.
Sunny, with a high near 87.
Mostly clear, with a low around 64.
Sunny, with a high near 86.
Partly cloudy, with a low around 65.
Mostly sunny, with a high near 87.
A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 69. Chance of precipitation is 20%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Monday
Aug 24
|
Areas Of Fog then Mostly Sunny
|
82°F |
2 mph
SE
|
|
Monday Night
Aug 24
|
Mostly Clear
|
60°F |
3 mph
E
|
|
Tuesday
Aug 25
|
Mostly Sunny
|
84°F |
5 mph
E
|
|
Tuesday Night
Aug 25
|
Partly Cloudy
|
67°F |
2 mph
SE
|
|
Wednesday
Aug 26
|
Mostly Sunny
|
88°F |
3 mph
S
|
|
Wednesday Night
Aug 26
|
Slight Chance Showers And Thunderstorms
|
67°F |
3 mph
SW
|
|
Thursday
Aug 27
|
Sunny
|
87°F |
3 to 7 mph
NW
|
|
Thursday Night
Aug 27
|
Mostly Clear
|
64°F |
1 to 5 mph
N
|
|
Friday
Aug 28
|
Sunny
|
86°F |
2 mph
NE
|
|
Friday Night
Aug 28
|
Partly Cloudy
|
65°F |
2 mph
E
|
|
Saturday
Aug 29
|
Mostly Sunny
|
87°F |
2 to 6 mph
S
|
|
Saturday Night
Aug 29
|
Partly Cloudy then Slight Chance Showers And Thunderstorms
|
69°F |
6 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Waterloo.
