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. High near 94, with temperatures falling to around 89 in the afternoon. Southwest wind around 8 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: Oct 12, 2026 1:16 AM CDT.
The active forecast window currently covers Oct 13 to Oct 18, 2026 for Waterloo, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 13 to Oct 18, 2026
- Latest sync
- Oct 12, 2026 1:16 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Waterloo
Tuesday looks like the warmest upcoming period in Waterloo at 94 degrees F.
Saturday Night is the coolest period ahead with temperatures near 36 degrees F.
The strongest winds are forecast for Friday at about 15 to 20 mph NW.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 12, 2026 1:16 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
A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71. Southwest wind around 7 mph. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 7am, then showers and thunderstorms. Mostly cloudy. High near 82, with temperatures falling to around 77 in the afternoon. Chance of precipitation is 90%.
Showers and thunderstorms. Mostly cloudy, with a low around 64. Chance of precipitation is 90%.
Showers and thunderstorms. Mostly cloudy, with a high near 78. Chance of precipitation is 80%.
Showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 55. Chance of precipitation is 80%.
A chance of showers and thunderstorms before 7am. Partly sunny, with a high near 65. Chance of precipitation is 30%.
Partly cloudy, with a low around 41.
Sunny, with a high near 59.
Clear, with a low around 36.
Sunny, with a high near 67.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Oct 13
|
Sunny
|
94°F |
8 mph
SW
|
|
Tuesday Night
Oct 13
|
Partly Cloudy then Chance Showers And Thunderstorms
|
71°F |
7 mph
SW
|
|
Wednesday
Oct 14
|
Chance Showers And Thunderstorms then Showers And Thunderstorms
|
82°F |
5 mph
W
|
|
Wednesday Night
Oct 14
|
Showers And Thunderstorms
|
64°F |
5 mph
N
|
|
Thursday
Oct 15
|
Showers And Thunderstorms
|
78°F |
7 mph
SE
|
|
Thursday Night
Oct 15
|
Showers And Thunderstorms
|
55°F |
6 to 15 mph
W
|
|
Friday
Oct 16
|
Chance Showers And Thunderstorms then Partly Sunny
|
65°F |
15 to 20 mph
NW
|
|
Friday Night
Oct 16
|
Partly Cloudy
|
41°F |
9 to 16 mph
NW
|
|
Saturday
Oct 17
|
Sunny
|
59°F |
5 to 9 mph
N
|
|
Saturday Night
Oct 17
|
Clear
|
36°F |
3 mph
E
|
|
Sunday
Oct 18
|
Sunny
|
67°F |
2 to 6 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Waterloo.
