Sullivan, IL Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Sullivan, IL in one place.
Mostly sunny, with a high near 86. South southeast wind 3 to 7 mph.
Local Weather Overview
This forecast page for Sullivan, 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: Aug 29, 2026 1:37 AM CDT.
The active forecast window currently covers Aug 29 to Sep 4, 2026 for Sullivan, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Aug 29 to Sep 4, 2026
- Latest sync
- Aug 29, 2026 1:37 AM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Sullivan
Tuesday looks like the warmest upcoming period in Sullivan at 98 degrees F.
Saturday Night is the coolest period ahead with temperatures near 67 degrees F.
The strongest winds are forecast for Sunday at about 7 to 14 mph S.
Precipitation is mentioned in 1 upcoming forecast period.
Forecast Details
- Last updated
- Aug 29, 2026 1:37 AM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- ILX
- Radar station
- KILX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 67. South southeast wind around 7 mph.
Mostly sunny, with a high near 91. South wind 7 to 14 mph, with gusts as high as 20 mph.
Mostly clear, with a low around 72. South wind 6 to 9 mph.
Sunny, with a high near 96. South southwest wind 8 to 12 mph, with gusts as high as 17 mph.
Mostly clear, with a low around 74. South southwest wind around 8 mph.
Sunny, with a high near 98.
Mostly clear, with a low around 76.
Mostly sunny, with a high near 97.
Mostly clear, with a low around 75.
Sunny, with a high near 97.
Mostly clear, with a low around 74.
A slight chance of rain showers between 7am and 1pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 95.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Aug 29
|
Mostly Sunny
|
86°F |
3 to 7 mph
SSE
|
|
Saturday Night
Aug 29
|
Partly Cloudy
|
67°F |
7 mph
SSE
|
|
Sunday
Aug 30
|
Mostly Sunny
|
91°F |
7 to 14 mph
S
|
|
Sunday Night
Aug 30
|
Mostly Clear
|
72°F |
6 to 9 mph
S
|
|
Monday
Aug 31
|
Sunny
|
96°F |
8 to 12 mph
SSW
|
|
Monday Night
Aug 31
|
Mostly Clear
|
74°F |
8 mph
SSW
|
|
Tuesday
Sep 1
|
Sunny
|
98°F |
9 mph
SW
|
|
Tuesday Night
Sep 1
|
Mostly Clear
|
76°F |
8 mph
SSW
|
|
Wednesday
Sep 2
|
Mostly Sunny
|
97°F |
9 mph
SW
|
|
Wednesday Night
Sep 2
|
Mostly Clear
|
75°F |
6 mph
SSW
|
|
Thursday
Sep 3
|
Sunny
|
97°F |
7 mph
SW
|
|
Thursday Night
Sep 3
|
Mostly Clear
|
74°F |
6 mph
SSW
|
|
Friday
Sep 4
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
95°F |
8 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Sullivan.
