Waterloo, IL Weather Forecast
Local 7-day forecast
Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Waterloo, IL in one place.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. South wind around 5 mph. Chance of precipitation is 40%.
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: Jul 10, 2026 6:34 AM CDT.
The active forecast window currently covers Jul 10 to Jul 16, 2026 for Waterloo, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 10 to Jul 16, 2026
- Latest sync
- Jul 10, 2026 6:34 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Waterloo
Wednesday looks like the warmest upcoming period in Waterloo at 90 degrees F.
Sunday Night is the coolest period ahead with temperatures near 66 degrees F.
The strongest winds are forecast for Monday at about 3 to 8 mph NE.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 10, 2026 6:34 AM CDT
- Coverage
- 7 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
Partly sunny, with a high near 88. West wind 2 to 6 mph. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 1am, then showers and thunderstorms between 1am and 3am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Southwest wind around 3 mph. Chance of precipitation is 80%.
A chance of showers and thunderstorms before 2pm, then showers and thunderstorms likely between 2pm and 3pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 85. Northwest wind around 3 mph. Chance of precipitation is 60%.
A chance of showers and thunderstorms. Partly cloudy, with a low around 67. North wind around 3 mph. Chance of precipitation is 30%.
A chance of rain showers before 7am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 85. Chance of precipitation is 30%.
A chance of rain showers before 7pm. Mostly clear, with a low around 66. Chance of precipitation is 30%.
Sunny, with a high near 86.
Mostly clear, with a low around 67.
Sunny, with a high near 88.
Mostly clear, with a low around 69.
Sunny, with a high near 90.
Mostly clear, with a low around 71.
Sunny, with a high near 90.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Jul 10
|
Chance Showers And Thunderstorms
|
72°F |
5 mph
S
|
|
Friday
Jul 10
|
Partly Sunny
|
88°F |
2 to 6 mph
W
|
|
Friday Night
Jul 10
|
Chance Showers And Thunderstorms
|
70°F |
3 mph
SW
|
|
Saturday
Jul 11
|
Chance Showers And Thunderstorms
|
85°F |
3 mph
NW
|
|
Saturday Night
Jul 11
|
Chance Showers And Thunderstorms
|
67°F |
3 mph
N
|
|
Sunday
Jul 12
|
Chance Rain Showers
|
85°F |
3 to 7 mph
NE
|
|
Sunday Night
Jul 12
|
Chance Rain Showers then Mostly Clear
|
66°F |
2 to 6 mph
NE
|
|
Monday
Jul 13
|
Sunny
|
86°F |
3 to 8 mph
NE
|
|
Monday Night
Jul 13
|
Mostly Clear
|
67°F |
1 to 6 mph
NE
|
|
Tuesday
Jul 14
|
Sunny
|
88°F |
1 to 6 mph
NE
|
|
Tuesday Night
Jul 14
|
Mostly Clear
|
69°F |
0 to 5 mph
SE
|
|
Wednesday
Jul 15
|
Sunny
|
90°F |
3 mph
NE
|
|
Wednesday Night
Jul 15
|
Mostly Clear
|
71°F |
2 mph
S
|
|
Thursday
Jul 16
|
Sunny
|
90°F |
5 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Waterloo.
