Weather WorldSt. Peter, IL 7-Day Weather Forecast
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St. Peter Weather Forecast
St. Peter, IL Weather Forecast Date: 127 AM CDT Wed Sep 23 2026
Weather forecast for St. Peter, IL
Tonight Lo: 59°F Lo: 15°C |
Tonight... Mostly cloudy. Near steady temperature in the upper 50s. Northeast winds around 5 mph. |
Wed Hi: 69°FHi: 21°C Lo: 55°F Lo: 13°C |
Wednesday... Mostly cloudy. Highs in the upper 60s. Northeast winds 5 to 10 mph. |
| Thu Hi: 79°FHi: 26°C Lo: 59°F Lo: 15°C |
Thursday... Mostly cloudy in the morning, then becoming partly sunny. Highs in the upper 70s. Northeast winds around 5 mph. |
| Fri Hi: 75°FHi: 24°C Lo: 55°F Lo: 13°C |
Friday... Partly sunny. Highs in the mid 70s. |
| Sat Hi: 71°FHi: 22°C Lo: 55°F Lo: 13°C |
Saturday... Mostly cloudy. Highs in the lower 70s. Lows in the mid 50s. |
| Sun Hi: 79°FHi: 26°C Lo: 55°F Lo: 13°C |
Sunday... Partly sunny. Highs in the upper 70s. |
Mon Hi: 81°FHi: 27°C Lo: 59°F Lo: 15°C |
Monday... Partly cloudy. Lows in the mid 50s. Highs in the lower 80s. |
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