Saint Johns, IL Weather Forecast
Local 7-day forecast
Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Saint Johns, IL in one place.
A chance of rain showers between 7am and 10am, then a chance of showers and thunderstorms between 10am and 1pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 90. West southwest wind 1 to 5 mph. Chance of precipitation is 50%.
Local Weather Overview
This forecast page for Saint Johns, 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: Jul 15, 2026 12:16 AM CDT.
The active forecast window currently covers Jul 17 to Jul 21, 2026 for Saint Johns, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 17 to Jul 21, 2026
- Latest sync
- Jul 15, 2026 12:16 AM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Saint Johns
Monday looks like the warmest upcoming period in Saint Johns at 94 degrees F.
Friday Night is the coolest period ahead with temperatures near 72 degrees F.
The strongest winds are forecast for Tuesday at about 5 to 8 mph WNW.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 15, 2026 12:16 AM CDT
- Coverage
- 5 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. Partly cloudy, with a low around 72. West southwest wind around 3 mph.
Mostly sunny, with a high near 92. West wind 3 to 7 mph.
Mostly clear, with a low around 74. West wind around 5 mph.
Sunny, with a high near 93. West wind around 7 mph.
Mostly clear, with a low around 73. Southwest wind around 5 mph.
Sunny, with a high near 94. West southwest wind 3 to 7 mph.
Partly cloudy, with a low around 74. West southwest wind around 6 mph.
Sunny, with a high near 92. West northwest wind 5 to 8 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Jul 17
|
Chance Showers And Thunderstorms
|
90°F |
1 to 5 mph
WSW
|
|
Friday Night
Jul 17
|
Chance Showers And Thunderstorms then Partly Cloudy
|
72°F |
3 mph
WSW
|
|
Saturday
Jul 18
|
Mostly Sunny
|
92°F |
3 to 7 mph
W
|
|
Saturday Night
Jul 18
|
Mostly Clear
|
74°F |
5 mph
W
|
|
Sunday
Jul 19
|
Sunny
|
93°F |
7 mph
W
|
|
Sunday Night
Jul 19
|
Mostly Clear
|
73°F |
5 mph
SW
|
|
Monday
Jul 20
|
Sunny
|
94°F |
3 to 7 mph
WSW
|
|
Monday Night
Jul 20
|
Partly Cloudy
|
74°F |
6 mph
WSW
|
|
Tuesday
Jul 21
|
Sunny
|
92°F |
5 to 8 mph
WNW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Saint Johns.