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Herculaneum, MO 7-Day Weather Forecast
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Herculaneum Weather Forecast
Herculaneum, MO Weather Forecast Date: 608 PM CDT Thu Sep 17 2026
Weather forecast for Herculaneum, MO
Tonight Lo: 71°F Lo: 22°C |
Tonight... Partly cloudy with a slight chance of showers and thunderstorms this evening, then mostly clear after midnight. Lows in the lower 70s. South winds around 5 mph, becoming west after midnight. Chance of rain 20%. |
Fri Hi: 95°FHi: 35°C Lo: 71°F Lo: 22°C |
Friday... Sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the mid 90s. North winds around 5 mph. Chance of rain 20%. Heat index values up to 108 in the afternoon. |
Sat Hi: 99°FHi: 37°C Lo: 71°F Lo: 22°C |
Saturday... Mostly sunny. Hot with highs in the upper 90s. Southwest winds around 5 mph. |
Sun Hi: 95°FHi: 35°C Lo: 69°F Lo: 21°C |
Sunday... Mostly sunny with a 20% chance of showers. Highs in the mid 90s. |
| Mon Hi: 85°FHi: 29°C Lo: 61°F Lo: 16°C |
Monday... Mostly cloudy. A chance of showers in the morning, then showers likely with a chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 60%. |
Tue Hi: 75°FHi: 24°C Lo: 59°F Lo: 15°C |
Tuesday... Partly sunny. Highs in the mid 70s. |
Wed Hi: 80°FHi: 27°C Lo: 59°F Lo: 15°C |
Wednesday... Partly cloudy. Lows in the upper 50s. Highs around 80. |
| Thu Hi: 80°FHi: 27°C Lo: 59°F Lo: 15°C |
Thursday... Partly cloudy. Lows in the upper 50s. Highs around 80. |
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