Saint Mary, IL Weather Forecast
Local 7-day forecast
Rain Showers Likely
Track current conditions, temperature changes, wind, and the full daily outlook for Saint Mary, IL in one place.
Rain showers likely. Mostly sunny, with a high near 55. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
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: Apr 15, 2026 11:11 PM CDT.
The active forecast window currently covers Apr 18 to Apr 22, 2026 for Saint Mary, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 18 to Apr 22, 2026
- Latest sync
- Apr 15, 2026 11:11 PM CDT
- Forecast office
- DVN
- Source
- NOAA / NWS
Daily Outlook
This Week in Saint Mary
Wednesday looks like the warmest upcoming period in Saint Mary at 75 degrees F.
Saturday Night is the coolest period ahead with temperatures near 36 degrees F.
The strongest winds are forecast for Saturday at about 15 to 20 mph NW.
Precipitation is mentioned in 3 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 15, 2026 11:11 PM CDT
- Coverage
- 5 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
A slight chance of rain showers before 7pm. Mostly clear, with a low around 36.
Sunny, with a high near 60.
Mostly clear, with a low around 39.
Sunny, with a high near 70.
Mostly clear, with a low around 51.
Sunny, with a high near 74.
Partly cloudy, with a low around 53.
A slight chance of rain showers between 7am and 1pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 75.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Apr 18
|
Rain Showers Likely
|
55°F |
15 to 20 mph
NW
|
|
Saturday Night
Apr 18
|
Slight Chance Rain Showers then Mostly Clear
|
36°F |
10 to 15 mph
W
|
|
Sunday
Apr 19
|
Sunny
|
60°F |
10 to 15 mph
NW
|
|
Sunday Night
Apr 19
|
Mostly Clear
|
39°F |
5 to 10 mph
NE
|
|
Monday
Apr 20
|
Sunny
|
70°F |
10 to 15 mph
S
|
|
Monday Night
Apr 20
|
Mostly Clear
|
51°F |
10 to 15 mph
S
|
|
Tuesday
Apr 21
|
Sunny
|
74°F |
15 mph
SW
|
|
Tuesday Night
Apr 21
|
Partly Cloudy
|
53°F |
10 to 15 mph
SW
|
|
Wednesday
Apr 22
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
75°F |
10 to 15 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Saint Mary.