Waltham, IL Weather Forecast
Local 7-day forecast
Partly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Waltham, IL in one place.
Partly sunny, with a high near 79. South southeast wind 0 to 5 mph, with gusts as high as 10 mph.
Local Weather Overview
This forecast page for Waltham, 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 23, 2026 5:14 PM CDT.
The active forecast window currently covers Jul 24 to Jul 29, 2026 for Waltham, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 24 to Jul 29, 2026
- Latest sync
- Jul 23, 2026 5:14 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Waltham
Monday looks like the warmest upcoming period in Waltham at 93 degrees F.
Friday Night is the coolest period ahead with temperatures near 63 degrees F.
The strongest winds are forecast for Monday at about 10 to 15 mph SW.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 23, 2026 5:14 PM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- LOT
- Radar station
- KLOT
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A slight chance of rain showers after 1am. Mostly cloudy, with a low around 63. South wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 20%.
A slight chance of rain showers before 1pm. Partly sunny, with a high near 83. South southwest wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 20%.
Partly cloudy, with a low around 69.
Mostly sunny, with a high near 91.
A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74.
A chance of showers and thunderstorms before 7am, then a slight chance of showers and thunderstorms between 7am and 1pm. Mostly sunny, with a high near 93.
Mostly clear, with a low around 71.
Sunny, with a high near 89.
Mostly clear, with a low around 67.
Sunny, with a high near 86.
Mostly clear, with a low around 66.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Jul 24
|
Partly Sunny
|
79°F |
0 to 5 mph
SSE
|
|
Friday Night
Jul 24
|
Mostly Cloudy then Slight Chance Rain Showers
|
63°F |
5 mph
S
|
|
Saturday
Jul 25
|
Slight Chance Rain Showers
|
83°F |
5 mph
SSW
|
|
Saturday Night
Jul 25
|
Partly Cloudy
|
69°F |
5 mph
SW
|
|
Sunday
Jul 26
|
Mostly Sunny
|
91°F |
5 to 10 mph
SW
|
|
Sunday Night
Jul 26
|
Partly Cloudy then Chance Showers And Thunderstorms
|
74°F |
5 to 10 mph
SSW
|
|
Monday
Jul 27
|
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
|
93°F |
10 to 15 mph
SW
|
|
Monday Night
Jul 27
|
Mostly Clear
|
71°F |
5 to 10 mph
NW
|
|
Tuesday
Jul 28
|
Sunny
|
89°F |
5 to 10 mph
N
|
|
Tuesday Night
Jul 28
|
Mostly Clear
|
67°F |
5 mph
NE
|
|
Wednesday
Jul 29
|
Sunny
|
86°F |
5 mph
E
|
|
Wednesday Night
Jul 29
|
Mostly Clear
|
66°F |
5 mph
SE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Waltham.