Saint Johns, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Saint Johns, IL in one place.
Sunny. High near 80, with temperatures falling to around 78 in the afternoon. East northeast wind 7 to 12 mph, with gusts as high as 18 mph.
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: Jun 1, 2026 11:09 PM CDT.
The active forecast window currently covers Jun 2 to Jun 8, 2026 for Saint Johns, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jun 2 to Jun 8, 2026
- Latest sync
- Jun 1, 2026 11:09 PM 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 87 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 55 degrees F.
The strongest winds are forecast for Tuesday at about 7 to 12 mph ENE.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Jun 1, 2026 11:09 PM 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
Clear. Low around 55, with temperatures rising to around 57 overnight. Northeast wind 3 to 10 mph.
Sunny, with a high near 82. East wind around 6 mph.
Mostly clear, with a low around 59. Southeast wind around 3 mph.
Sunny, with a high near 84. South wind 1 to 9 mph.
Mostly clear, with a low around 63. South wind 3 to 9 mph.
Mostly sunny, with a high near 85. South wind 5 to 10 mph.
A slight chance of rain showers after 1am. Partly cloudy, with a low around 67. South wind 5 to 10 mph.
A slight chance of rain showers before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 86. South southwest wind 5 to 9 mph.
A chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 69. South wind 3 to 9 mph.
A chance of showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 86. South wind 3 to 8 mph.
A chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 70. South southeast wind 3 to 8 mph.
A chance of showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 87. South southeast wind 5 to 8 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Jun 2
|
Sunny
|
80°F |
7 to 12 mph
ENE
|
|
Tuesday Night
Jun 2
|
Clear
|
55°F |
3 to 10 mph
NE
|
|
Wednesday
Jun 3
|
Sunny
|
82°F |
6 mph
E
|
|
Wednesday Night
Jun 3
|
Mostly Clear
|
59°F |
3 mph
SE
|
|
Thursday
Jun 4
|
Sunny
|
84°F |
1 to 9 mph
S
|
|
Thursday Night
Jun 4
|
Mostly Clear
|
63°F |
3 to 9 mph
S
|
|
Friday
Jun 5
|
Mostly Sunny
|
85°F |
5 to 10 mph
S
|
|
Friday Night
Jun 5
|
Partly Cloudy then Slight Chance Rain Showers
|
67°F |
5 to 10 mph
S
|
|
Saturday
Jun 6
|
Slight Chance Rain Showers then Chance Showers And Thunderstorms
|
86°F |
5 to 9 mph
SSW
|
|
Saturday Night
Jun 6
|
Chance Showers And Thunderstorms
|
69°F |
3 to 9 mph
S
|
|
Sunday
Jun 7
|
Chance Showers And Thunderstorms
|
86°F |
3 to 8 mph
S
|
|
Sunday Night
Jun 7
|
Chance Showers And Thunderstorms
|
70°F |
3 to 8 mph
SSE
|
|
Monday
Jun 8
|
Chance Showers And Thunderstorms
|
87°F |
5 to 8 mph
SSE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Saint Johns.