| NWS Forecast for: Macoupin County Issued by: National Weather Service Saint Louis, MO Last Update: 708 PM CDT Tue Jul 21 2026 |  |
| Tonight: Mostly clear. Cooler with lows in the mid 60s. North winds 10 to 15 mph. Wednesday: Mostly sunny. Highs in the upper 70s. North winds 5 to 10 mph. Wednesday Night: Partly cloudy in the evening, then clearing. Lows in the upper 50s. Northeast winds 5 to 10 mph. Thursday: Sunny. Highs around 80. East winds around 5 mph. Thursday Night: Partly cloudy. Lows in the upper 50s. East winds around 5 mph. Friday: Partly sunny in the morning, then becoming mostly cloudy. A chance of showers and thunderstorms. Highs in the upper 70s. Chance of rain 50 percent. Friday Night: Mostly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 60s. Chance of rain 20 percent. Saturday: Mostly sunny. Highs in the upper 80s. Saturday Night And Sunday: Mostly clear. Lows in the upper 60s. Highs in the mid 90s. Heat index values up to 105. Sunday Night And Monday: Mostly clear. Hot. Lows in the mid 70s. Highs in the upper 90s. Heat index values up to 105. Monday Night: Mostly clear with a slight chance of showers and thunderstorms. Lows around 70. Chance of rain 20 percent. Heat index values up to 105 early in the evening. Tuesday: Sunny. Highs in the lower 90s. | |
| Zone Forecast: Macoupin County | |
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