Altamont, IL Weather Forecast
Local 7-day forecast
Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Altamont, IL in one place.
Rain showers likely before 7am, then showers and thunderstorms. Mostly cloudy, with a high near 81. South wind 3 to 9 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Local Weather Overview
This forecast page for Altamont, 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 13, 2026 11:08 PM CDT.
The active forecast window currently covers Oct 15 to Oct 20, 2026 for Altamont, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 15 to Oct 20, 2026
- Latest sync
- Oct 13, 2026 11:08 PM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Altamont
Thursday looks like the warmest upcoming period in Altamont at 81 degrees F.
Friday Night is the coolest period ahead with temperatures near 35 degrees F.
The strongest winds are forecast for Friday at about 17 to 21 mph NW.
Precipitation is mentioned in 3 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 13, 2026 11:08 PM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- ILX
- Radar station
- KVWX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Showers and thunderstorms likely before 7pm, then a chance of showers and thunderstorms between 7pm and 10pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 49. West northwest wind 7 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
A slight chance of rain showers before 7am. Mostly sunny, with a high near 59. Northwest wind 17 to 21 mph, with gusts as high as 31 mph. New rainfall amounts less than a tenth of an inch possible.
Mostly clear, with a low around 35. North wind 3 to 15 mph, with gusts as high as 22 mph.
Sunny, with a high near 61.
Clear, with a low around 36.
Sunny, with a high near 68.
Partly cloudy, with a low around 44.
Mostly sunny, with a high near 73.
Partly cloudy, with a low around 49.
Mostly sunny, with a high near 76.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Oct 15
|
Showers And Thunderstorms
|
81°F |
3 to 9 mph
S
|
|
Thursday Night
Oct 15
|
Showers And Thunderstorms Likely
|
49°F |
7 to 18 mph
WNW
|
|
Friday
Oct 16
|
Slight Chance Rain Showers then Mostly Sunny
|
59°F |
17 to 21 mph
NW
|
|
Friday Night
Oct 16
|
Mostly Clear
|
35°F |
3 to 15 mph
N
|
|
Saturday
Oct 17
|
Sunny
|
61°F |
5 mph
NE
|
|
Saturday Night
Oct 17
|
Clear
|
36°F |
2 mph
SE
|
|
Sunday
Oct 18
|
Sunny
|
68°F |
2 to 7 mph
S
|
|
Sunday Night
Oct 18
|
Partly Cloudy
|
44°F |
2 to 6 mph
S
|
|
Monday
Oct 19
|
Mostly Sunny
|
73°F |
2 to 6 mph
SSW
|
|
Monday Night
Oct 19
|
Partly Cloudy
|
49°F |
3 mph
SSE
|
|
Tuesday
Oct 20
|
Mostly Sunny
|
76°F |
1 to 5 mph
SE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Altamont.