Waterloo, IL Weather Forecast
Local 7-day forecast
Showers And Thunderstorms Likely
Track current conditions, temperature changes, wind, and the full daily outlook for Waterloo, IL in one place.
A chance of rain showers before 10am, then showers and thunderstorms likely. Mostly cloudy, with a high near 79. East wind around 7 mph. Chance of precipitation is 70%.
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: May 24, 2026 10:14 AM CDT.
The active forecast window currently covers May 26 to May 30, 2026 for Waterloo, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- May 26 to May 30, 2026
- Latest sync
- May 24, 2026 10:14 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Waterloo
Wednesday looks like the warmest upcoming period in Waterloo at 84 degrees F.
Saturday Night is the coolest period ahead with temperatures near 59 degrees F.
The strongest winds are forecast for Saturday at about 10 mph NE.
Precipitation is mentioned in 10 upcoming forecast periods.
Forecast Details
- Last updated
- May 24, 2026 10:14 AM CDT
- Coverage
- 5 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
Showers and thunderstorms likely. Mostly cloudy, with a low around 65. Chance of precipitation is 70%.
A chance of rain showers before 7am, then showers and thunderstorms likely. Partly sunny, with a high near 84. Chance of precipitation is 60%.
Showers and thunderstorms likely before 7pm, then a chance of showers and thunderstorms. Partly cloudy, with a low around 66. Chance of precipitation is 60%.
A chance of showers and thunderstorms. Partly sunny, with a high near 84. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 7pm, then showers and thunderstorms likely. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.
A chance of rain showers before 7am, then showers and thunderstorms likely. Partly sunny, with a high near 79. Chance of precipitation is 60%.
Showers and thunderstorms likely. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.
A chance of rain showers before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 78. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 59. Chance of precipitation is 30%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
May 26
|
Showers And Thunderstorms Likely
|
79°F |
7 mph
E
|
|
Tuesday Night
May 26
|
Showers And Thunderstorms Likely
|
65°F |
6 mph
SE
|
|
Wednesday
May 27
|
Showers And Thunderstorms Likely
|
84°F |
5 mph
S
|
|
Wednesday Night
May 27
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
66°F |
3 mph
SE
|
|
Thursday
May 28
|
Chance Showers And Thunderstorms
|
84°F |
5 mph
E
|
|
Thursday Night
May 28
|
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
|
65°F |
5 mph
E
|
|
Friday
May 29
|
Showers And Thunderstorms Likely
|
79°F |
8 mph
E
|
|
Friday Night
May 29
|
Showers And Thunderstorms Likely
|
60°F |
8 mph
NE
|
|
Saturday
May 30
|
Chance Rain Showers
|
78°F |
10 mph
NE
|
|
Saturday Night
May 30
|
Chance Showers And Thunderstorms then Partly Cloudy
|
59°F |
6 to 9 mph
NE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Waterloo.
