Johnston City, IL Weather Forecast
Local 7-day forecast
Showers And Thunderstorms Likely
Track current conditions, temperature changes, wind, and the full daily outlook for Johnston City, IL in one place.
Showers and thunderstorms likely before 4pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 76. East northeast wind 3 to 7 mph. Chance of precipitation is 70%.
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: May 26, 2026 10:48 AM CDT.
The active forecast window currently covers May 26 to Jun 1, 2026 for Johnston City, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- May 26 to Jun 1, 2026
- Latest sync
- May 26, 2026 10:48 AM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Johnston City
Thursday looks like the warmest upcoming period in Johnston City at 83 degrees F.
Monday Night is the coolest period ahead with temperatures near 58 degrees F.
The strongest winds are forecast for Saturday at about 3 to 10 mph ENE.
Precipitation is mentioned in 10 upcoming forecast periods.
Forecast Details
- Last updated
- May 26, 2026 10:48 AM CDT
- Coverage
- 7 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. Low around 66, with temperatures rising to around 68 overnight. South wind 1 to 5 mph. Chance of precipitation is 40%.
A slight chance of rain showers before 10am, then a slight chance of showers and thunderstorms between 10am and noon, then a chance of showers and thunderstorms between noon and 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 82. West wind 1 to 5 mph. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 65. North northeast wind 0 to 3 mph. Chance of precipitation is 40%.
A slight chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 83. East northeast wind 1 to 8 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 65. East northeast wind around 7 mph. Chance of precipitation is 20%.
A slight chance of rain showers after 1pm. Mostly cloudy, with a high near 79. East northeast wind around 8 mph.
A slight chance of rain showers. Mostly cloudy, with a low around 62. East northeast wind 3 to 7 mph.
A slight chance of rain showers before 7am, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 80. East northeast wind 3 to 10 mph.
A slight chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 61. East northeast wind 5 to 9 mph.
Mostly sunny, with a high near 79. Northeast wind 7 to 10 mph.
Partly cloudy, with a low around 59. Northeast wind 3 to 9 mph.
Mostly sunny, with a high near 80. Northeast wind 5 to 9 mph.
Mostly clear, with a low around 58. North northeast wind 2 to 8 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
May 26
|
Showers And Thunderstorms Likely
|
76°F |
3 to 7 mph
ENE
|
|
Tonight
May 26
|
Chance Showers And Thunderstorms
|
66°F |
1 to 5 mph
S
|
|
Wednesday
May 27
|
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
|
82°F |
1 to 5 mph
W
|
|
Wednesday Night
May 27
|
Chance Showers And Thunderstorms then Partly Cloudy
|
65°F |
0 to 3 mph
NNE
|
|
Thursday
May 28
|
Mostly Cloudy then Slight Chance Showers And Thunderstorms
|
83°F |
1 to 8 mph
ENE
|
|
Thursday Night
May 28
|
Slight Chance Showers And Thunderstorms then Mostly Cloudy
|
65°F |
7 mph
ENE
|
|
Friday
May 29
|
Mostly Cloudy then Slight Chance Rain Showers
|
79°F |
8 mph
ENE
|
|
Friday Night
May 29
|
Slight Chance Rain Showers
|
62°F |
3 to 7 mph
ENE
|
|
Saturday
May 30
|
Slight Chance Showers And Thunderstorms
|
80°F |
3 to 10 mph
ENE
|
|
Saturday Night
May 30
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
61°F |
5 to 9 mph
ENE
|
|
Sunday
May 31
|
Mostly Sunny
|
79°F |
7 to 10 mph
NE
|
|
Sunday Night
May 31
|
Partly Cloudy
|
59°F |
3 to 9 mph
NE
|
|
Monday
Jun 1
|
Mostly Sunny
|
80°F |
5 to 9 mph
NE
|
|
Monday Night
Jun 1
|
Mostly Clear
|
58°F |
2 to 8 mph
NNE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Johnston City.