Johnston City, IL Weather Forecast
Local 7-day forecast
Mostly Sunny then Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Johnston City, IL in one place.
A chance of showers and thunderstorms between 3pm and 4pm, then a chance of showers and thunderstorms. Mostly sunny. High near 79, with temperatures falling to around 76 in the afternoon. West southwest wind 8 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 50%.
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: Apr 9, 2026 5:27 PM CDT.
The active forecast window currently covers Apr 10 to Apr 15, 2026 for Johnston City, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 10 to Apr 15, 2026
- Latest sync
- Apr 9, 2026 5:27 PM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Johnston City
Tuesday looks like the warmest upcoming period in Johnston City at 87 degrees F.
Friday Night is the coolest period ahead with temperatures near 54 degrees F.
The strongest winds are forecast for Tuesday at about 13 to 18 mph SSW.
Precipitation is mentioned in 11 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 9, 2026 5:27 PM 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
A chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 54. North northeast wind 3 to 7 mph. Chance of precipitation is 50%.
A slight chance of rain showers before 7am, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 80. East southeast wind around 6 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 61. South southeast wind around 6 mph. Chance of precipitation is 20%.
Partly sunny, with a high near 82. South wind 6 to 17 mph, with gusts as high as 28 mph.
A slight chance of rain showers between 7pm and 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 67. South southwest wind around 15 mph, with gusts as high as 24 mph.
A chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms between 7am and 1pm, then a slight chance of showers and thunderstorms. Mostly cloudy, with a high near 83. South southwest wind around 17 mph, with gusts as high as 28 mph.
A slight chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 70. South southwest wind around 15 mph, with gusts as high as 24 mph.
A slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 87. South southwest wind 13 to 18 mph, with gusts as high as 28 mph.
A slight chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 68. South southwest wind around 15 mph, with gusts as high as 23 mph.
A chance of showers and thunderstorms. Partly sunny, with a high near 84. South southwest wind 14 to 17 mph, with gusts as high as 26 mph.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. South southwest wind 7 to 13 mph, with gusts as high as 21 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Apr 10
|
Mostly Sunny then Chance Showers And Thunderstorms
|
79°F |
8 to 14 mph
WSW
|
|
Friday Night
Apr 10
|
Chance Showers And Thunderstorms
|
54°F |
3 to 7 mph
NNE
|
|
Saturday
Apr 11
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
80°F |
6 mph
ESE
|
|
Saturday Night
Apr 11
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
61°F |
6 mph
SSE
|
|
Sunday
Apr 12
|
Partly Sunny
|
82°F |
6 to 17 mph
S
|
|
Sunday Night
Apr 12
|
Slight Chance Rain Showers then Chance Showers And Thunderstorms
|
67°F |
15 mph
SSW
|
|
Monday
Apr 13
|
Chance Showers And Thunderstorms
|
83°F |
17 mph
SSW
|
|
Monday Night
Apr 13
|
Slight Chance Showers And Thunderstorms then Mostly Cloudy
|
70°F |
15 mph
SSW
|
|
Tuesday
Apr 14
|
Partly Sunny then Slight Chance Showers And Thunderstorms
|
87°F |
13 to 18 mph
SSW
|
|
Tuesday Night
Apr 14
|
Slight Chance Showers And Thunderstorms
|
68°F |
15 mph
SSW
|
|
Wednesday
Apr 15
|
Chance Showers And Thunderstorms
|
84°F |
14 to 17 mph
SSW
|
|
Wednesday Night
Apr 15
|
Chance Showers And Thunderstorms
|
63°F |
7 to 13 mph
SSW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Johnston City.