Weather World
St. Marys, IL 7-Day Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
St. Marys Weather Forecast
St. Marys, IL Weather Forecast Date: 127 PM CDT Sat Oct 17 2026
Weather forecast for St. Marys, IL
Today Hi: 59°FHi: 15°C Lo: 31°F Lo: -1°C |
This Afternoon... Sunny. Near steady temperature in the upper 50s. Northeast winds 5 to 10 mph. |
| Sun Hi: 69°FHi: 21°C Lo: 35°F Lo: 2°C |
Sunday... Widespread frost in the morning. Sunny. Highs in the upper 60s. Southeast winds around 5 mph. |
| Mon Hi: 71°FHi: 22°C Lo: 41°F Lo: 5°C |
Monday... Sunny. Highs in the lower 70s. Light and variable winds. |
| Tue Hi: 75°FHi: 24°C Lo: 41°F Lo: 5°C |
Tuesday... Mostly clear. Lows in the lower 40s. Highs in the mid 70s. |
| Wed Hi: 75°FHi: 24°C Lo: 41°F Lo: 5°C |
Wednesday... Mostly clear. Lows in the lower 40s. Highs in the mid 70s. |
| Thu Hi: 75°FHi: 24°C Lo: 41°F Lo: 5°C |
Thursday... Mostly clear. Lows in the lower 40s. Highs in the mid 70s. |
| Thu Hi: 75°FHi: 24°C Lo: 49°F Lo: 9°C |
Thursday... Mostly clear. Lows in the lower 40s. Highs in the mid 70s. |
St. Marys Radar Loop
Use the map search tool if you want to place a location marker on the radar map...