| NWS Forecast for: Pontoon Beach IL Issued by: National Weather Service Saint Louis, MO Last Update: 7:06 pm CDT Apr 16, 2026 |  |
| Tonight: Mostly clear, with a low around 16. Calm wind. Friday: Isolated showers and thunderstorms before 10am, then isolated showers and thunderstorms after 4pm. Mostly sunny, with a high near 29. South wind 10 to 15 km/h increasing to 22 to 27 km/h in the afternoon. Winds could gust as high as 40 km/h. Chance of precipitation is 20%. Friday Night: Showers and thunderstorms, mainly before 1am, then showers and possibly a thunderstorm after 1am. Low around 10. South wind 18 to 24 km/h becoming west after midnight. Winds could gust as high as 37 km/h. Chance of precipitation is 100%. Saturday: Showers likely, mainly before 7am. Mostly cloudy, then gradually becoming sunny, with a high near 16. Northwest wind 23 to 27 km/h, with gusts as high as 40 km/h. Chance of precipitation is 60%. Saturday Night: Mostly clear, with a low around 4. Northwest wind 18 to 23 km/h decreasing to 10 to 15 km/h after midnight. Winds could gust as high as 34 km/h. Sunday: Sunny, with a high near 19. Sunday Night: Mostly clear, with a low around 6. Monday: Sunny, with a high near 23. Monday Night: Mostly clear, with a low around 12. Tuesday: Mostly sunny, with a high near 26. Tuesday Night: Partly cloudy, with a low around 14. Wednesday: Sunny, with a high near 26. Wednesday Night: A 20 percent chance of showers. Partly cloudy, with a low around 14. Thursday: A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 27. | |
| Pontoon Beach IL 38.73°N 90.06°W (Elev. 423 m) | |
Visit your local NWS office at: https://www.weather.gov/lsx/ |
