Johnston City, IL Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Johnston City, IL in one place.
Mostly sunny, with a high near 88. East wind around 5 mph.
Local Weather Overview
This forecast page for Johnston City, 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 24, 2026 5:49 AM CDT.
The active forecast window currently covers Aug 25 to Aug 30, 2026 for Johnston City, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Aug 25 to Aug 30, 2026
- Latest sync
- Aug 24, 2026 5:49 AM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Johnston City
Sunday looks like the warmest upcoming period in Johnston City at 94 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 65 degrees F.
The strongest winds are forecast for Sunday at about 2 to 10 mph S.
Precipitation is mentioned in 1 upcoming forecast period.
Forecast Details
- Last updated
- Aug 24, 2026 5:49 AM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- PAH
- Radar station
- KPAH
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 65. East northeast wind 0 to 3 mph.
Mostly sunny, with a high near 90. Southwest wind 0 to 6 mph.
A slight chance of rain showers between 7pm and 1am. Partly cloudy, with a low around 68. Northwest wind 0 to 3 mph.
Sunny, with a high near 90. North northwest wind 0 to 9 mph.
Mostly clear, with a low around 65. North wind 0 to 7 mph.
Sunny, with a high near 90. North wind 0 to 7 mph.
Mostly clear, with a low around 66. East northeast wind 1 to 5 mph.
Sunny, with a high near 92. South southeast wind 1 to 6 mph.
Partly cloudy, with a low around 69. South southeast wind around 5 mph.
Mostly sunny, with a high near 94. South wind 2 to 10 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Aug 25
|
Mostly Sunny
|
88°F |
5 mph
E
|
|
Tuesday Night
Aug 25
|
Partly Cloudy
|
65°F |
0 to 3 mph
ENE
|
|
Wednesday
Aug 26
|
Mostly Sunny
|
90°F |
0 to 6 mph
SW
|
|
Wednesday Night
Aug 26
|
Slight Chance Rain Showers
|
68°F |
0 to 3 mph
NW
|
|
Thursday
Aug 27
|
Sunny
|
90°F |
0 to 9 mph
NNW
|
|
Thursday Night
Aug 27
|
Mostly Clear
|
65°F |
0 to 7 mph
N
|
|
Friday
Aug 28
|
Sunny
|
90°F |
0 to 7 mph
N
|
|
Friday Night
Aug 28
|
Mostly Clear
|
66°F |
1 to 5 mph
ENE
|
|
Saturday
Aug 29
|
Sunny
|
92°F |
1 to 6 mph
SSE
|
|
Saturday Night
Aug 29
|
Partly Cloudy
|
69°F |
5 mph
SSE
|
|
Sunday
Aug 30
|
Mostly Sunny
|
94°F |
2 to 10 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Johnston City.