Saint Mary, IL Weather Forecast
Local 7-day forecast
Mostly Cloudy
Track current conditions, temperature changes, wind, and the full daily outlook for Saint Mary, IL in one place.
Mostly cloudy. Low around 40, with temperatures rising to around 42 overnight. North wind around 10 mph.
Local Weather Overview
This forecast page for Saint Mary, 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 5:36 AM CST.
The active forecast window currently covers Nov 6 to Nov 12, 2026 for Saint Mary, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Nov 6 to Nov 12, 2026
- Latest sync
- Nov 6, 2026 5:36 AM CST
- Forecast office
- DVN
- Source
- NOAA / NWS
Daily Outlook
This Week in Saint Mary
Monday looks like the warmest upcoming period in Saint Mary at 67 degrees F.
Friday Night is the coolest period ahead with temperatures near 30 degrees F.
The strongest winds are forecast for Overnight at about 10 mph N.
The forecast from Nov 6 through Nov 12 stays mostly dry.
Forecast Details
- Last updated
- Nov 6, 2026 5:36 AM CST
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- DVN
- Radar station
- KILX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly sunny. High near 49, with temperatures falling to around 46 in the afternoon. North wind 5 to 10 mph.
Mostly clear, with a low around 30. North wind 0 to 5 mph.
Mostly sunny, with a high near 52. West wind 0 to 5 mph.
Mostly clear, with a low around 34.
Sunny, with a high near 62.
Mostly clear, with a low around 37.
Sunny, with a high near 67.
Clear, with a low around 42.
Sunny, with a high near 65.
Mostly clear, with a low around 39.
Mostly sunny, with a high near 63.
Partly cloudy, with a low around 40.
Mostly sunny, with a high near 58.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Nov 6
|
Mostly Cloudy
|
40°F |
10 mph
N
|
|
Friday
Nov 6
|
Mostly Sunny
|
49°F |
5 to 10 mph
N
|
|
Friday Night
Nov 6
|
Mostly Clear
|
30°F |
0 to 5 mph
N
|
|
Saturday
Nov 7
|
Mostly Sunny
|
52°F |
0 to 5 mph
W
|
|
Saturday Night
Nov 7
|
Mostly Clear
|
34°F |
5 mph
SW
|
|
Sunday
Nov 8
|
Sunny
|
62°F |
5 to 10 mph
W
|
|
Sunday Night
Nov 8
|
Mostly Clear
|
37°F |
0 to 5 mph
SW
|
|
Monday
Nov 9
|
Sunny
|
67°F |
0 to 10 mph
SW
|
|
Monday Night
Nov 9
|
Clear
|
42°F |
5 to 10 mph
W
|
|
Tuesday
Nov 10
|
Sunny
|
65°F |
0 to 5 mph
NW
|
|
Tuesday Night
Nov 10
|
Mostly Clear
|
39°F |
0 mph
|
|
Veterans Day
Nov 11
|
Mostly Sunny
|
63°F |
0 to 5 mph
NW
|
|
Wednesday Night
Nov 11
|
Partly Cloudy
|
40°F |
5 mph
N
|
|
Thursday
Nov 12
|
Mostly Sunny
|
58°F |
5 to 10 mph
N
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Saint Mary.