Waterloo, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Waterloo, IL in one place.
Sunny, with a high near 93. Heat index values as high as 105. South wind 8 to 15 mph, with gusts as high as 25 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: Jun 10, 2026 9:19 AM CDT.
The active forecast window currently covers Jun 11 to Jun 16, 2026 for Waterloo, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jun 11 to Jun 16, 2026
- Latest sync
- Jun 10, 2026 9:19 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Waterloo
Thursday looks like the warmest upcoming period in Waterloo at 93 degrees F.
Monday Night is the coolest period ahead with temperatures near 59 degrees F.
The strongest winds are forecast for Thursday at about 8 to 15 mph S.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- Jun 10, 2026 9:19 AM 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
Showers and thunderstorms between 7pm and 1am, then a slight chance of showers and thunderstorms. Partly cloudy, with a low around 66. West wind 7 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.
A slight chance of rain showers before 7am. Sunny, with a high near 84. Northwest wind around 6 mph. Chance of precipitation is 20%.
Mostly clear, with a low around 63.
A chance of showers and thunderstorms between 7am and 1pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 86. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 1am, then showers and thunderstorms likely. Mostly cloudy, with a low around 68. Chance of precipitation is 70%.
Showers and thunderstorms likely before 1pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 81. Chance of precipitation is 70%.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. Chance of precipitation is 40%.
A chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 78. Chance of precipitation is 40%.
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 59. Chance of precipitation is 20%.
A slight chance of rain showers before 7am. Mostly sunny, with a high near 80. Chance of precipitation is 20%.
Partly cloudy, with a low around 61.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Jun 11
|
Sunny
|
93°F |
8 to 15 mph
S
|
|
Thursday Night
Jun 11
|
Showers And Thunderstorms
|
66°F |
7 to 15 mph
W
|
|
Friday
Jun 12
|
Slight Chance Rain Showers then Sunny
|
84°F |
6 mph
NW
|
|
Friday Night
Jun 12
|
Mostly Clear
|
63°F |
3 mph
E
|
|
Saturday
Jun 13
|
Chance Showers And Thunderstorms
|
86°F |
3 to 8 mph
S
|
|
Saturday Night
Jun 13
|
Chance Showers And Thunderstorms
|
68°F |
7 mph
SW
|
|
Sunday
Jun 14
|
Showers And Thunderstorms Likely
|
81°F |
9 mph
NW
|
|
Sunday Night
Jun 14
|
Chance Showers And Thunderstorms
|
62°F |
5 to 9 mph
NE
|
|
Monday
Jun 15
|
Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
78°F |
7 mph
N
|
|
Monday Night
Jun 15
|
Slight Chance Showers And Thunderstorms
|
59°F |
6 mph
NW
|
|
Tuesday
Jun 16
|
Slight Chance Rain Showers then Mostly Sunny
|
80°F |
5 to 8 mph
W
|
|
Tuesday Night
Jun 16
|
Partly Cloudy
|
61°F |
6 mph
W
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Waterloo.
