Saint Augustine, IL Weather Forecast
Local 7-day forecast
Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Saint Augustine, IL in one place.
A chance of showers and thunderstorms between 7am and 1pm, then showers and thunderstorms likely. Mostly sunny, with a high near 90. Southwest wind 0 to 5 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
Local Weather Overview
This forecast page for Saint Augustine, 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 14, 2026 11:47 PM CDT.
The active forecast window currently covers Jul 17 to Jul 21, 2026 for Saint Augustine, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 17 to Jul 21, 2026
- Latest sync
- Jul 14, 2026 11:47 PM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Saint Augustine
Saturday looks like the warmest upcoming period in Saint Augustine at 92 degrees F.
Monday Night is the coolest period ahead with temperatures near 70 degrees F.
The strongest winds are forecast for Tuesday at about 5 to 12 mph NW.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 14, 2026 11:47 PM CDT
- Coverage
- 5 days
- Time zone
- America/Chicago
- Forecast office
- ILX
- Radar station
- KDVN
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Showers and thunderstorms likely before 7pm, then a slight chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 73. Southwest wind around 3 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
Sunny, with a high near 92.
Mostly clear, with a low around 72.
Sunny, with a high near 90.
Mostly clear, with a low around 71.
A slight chance of showers and thunderstorms after 7am. Mostly sunny, with a high near 91.
A slight chance of rain showers. Mostly clear, with a low around 70.
A slight chance of rain showers before 7am. Mostly sunny, with a high near 87.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Jul 17
|
Chance Showers And Thunderstorms
|
90°F |
0 to 5 mph
SW
|
|
Friday Night
Jul 17
|
Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms
|
73°F |
3 mph
SW
|
|
Saturday
Jul 18
|
Sunny
|
92°F |
5 to 9 mph
WSW
|
|
Saturday Night
Jul 18
|
Mostly Clear
|
72°F |
6 mph
W
|
|
Sunday
Jul 19
|
Sunny
|
90°F |
5 mph
W
|
|
Sunday Night
Jul 19
|
Mostly Clear
|
71°F |
3 mph
SSW
|
|
Monday
Jul 20
|
Slight Chance Showers And Thunderstorms
|
91°F |
3 to 9 mph
WSW
|
|
Monday Night
Jul 20
|
Slight Chance Rain Showers
|
70°F |
3 to 7 mph
WNW
|
|
Tuesday
Jul 21
|
Slight Chance Rain Showers then Mostly Sunny
|
87°F |
5 to 12 mph
NW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Saint Augustine.