Saint Johns, IL Weather Forecast
Local 7-day forecast
Mostly Cloudy
Track current conditions, temperature changes, wind, and the full daily outlook for Saint Johns, IL in one place.
Mostly cloudy. Low around 46, with temperatures rising to around 50 overnight. Northwest wind around 8 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: Nov 6, 2026 5:40 AM CST.
The active forecast window currently covers Nov 6 to Nov 12, 2026 for Saint Johns, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Nov 6 to Nov 12, 2026
- Latest sync
- Nov 6, 2026 5:40 AM CST
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Saint Johns
Tuesday looks like the warmest upcoming period in Saint Johns at 68 degrees F.
Saturday Night is the coolest period ahead with temperatures near 29 degrees F.
The strongest winds are forecast for Friday at about 8 to 12 mph NNW.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- Nov 6, 2026 5:40 AM CST
- 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
Mostly sunny. High near 56, with temperatures falling to around 52 in the afternoon. North northwest wind 8 to 12 mph.
Widespread frost after midnight. Clear. Low around 30, with temperatures rising to around 32 overnight. North northwest wind 2 to 6 mph.
Widespread frost before 9am. Sunny, with a high near 55. North northwest wind around 5 mph.
Widespread frost after 11pm. Mostly clear, with a low around 29. West northwest wind around 1 mph.
Widespread frost before 8am. Sunny, with a high near 63. West southwest wind 1 to 6 mph.
Clear, with a low around 36. West southwest wind around 2 mph.
Sunny, with a high near 67. Southwest wind 0 to 7 mph.
Mostly clear, with a low around 40. Southwest wind around 5 mph.
Sunny, with a high near 68. West southwest wind 1 to 5 mph.
Mostly clear, with a low around 41. Wind around 0 mph.
A slight chance of rain showers after noon. Sunny, with a high near 66. Northwest wind 0 to 5 mph.
A slight chance of rain showers. Partly cloudy, with a low around 42. Northwest wind around 2 mph.
Mostly sunny, with a high near 62. North northwest wind 3 to 12 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Nov 6
|
Mostly Cloudy
|
46°F |
8 mph
NW
|
|
Friday
Nov 6
|
Mostly Sunny
|
56°F |
8 to 12 mph
NNW
|
|
Friday Night
Nov 6
|
Clear then Widespread Frost
|
30°F |
2 to 6 mph
NNW
|
|
Saturday
Nov 7
|
Widespread Frost then Sunny
|
55°F |
5 mph
NNW
|
|
Saturday Night
Nov 7
|
Widespread Frost
|
29°F |
1 mph
WNW
|
|
Sunday
Nov 8
|
Widespread Frost then Sunny
|
63°F |
1 to 6 mph
WSW
|
|
Sunday Night
Nov 8
|
Clear
|
36°F |
2 mph
WSW
|
|
Monday
Nov 9
|
Sunny
|
67°F |
0 to 7 mph
SW
|
|
Monday Night
Nov 9
|
Mostly Clear
|
40°F |
5 mph
SW
|
|
Tuesday
Nov 10
|
Sunny
|
68°F |
1 to 5 mph
WSW
|
|
Tuesday Night
Nov 10
|
Mostly Clear
|
41°F |
0 mph
|
|
Veterans Day
Nov 11
|
Sunny then Slight Chance Rain Showers
|
66°F |
0 to 5 mph
NW
|
|
Wednesday Night
Nov 11
|
Slight Chance Rain Showers
|
42°F |
2 mph
NW
|
|
Thursday
Nov 12
|
Mostly Sunny
|
62°F |
3 to 12 mph
NNW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Saint Johns.