| NWS Forecast for: Pontoon Beach IL Issued by: National Weather Service Saint Louis, MO Last Update: 4:06 am CST Mar 5, 2026 |  |
Overnight: Showers and possibly a thunderstorm. Patchy fog. Low around 52. Southeast wind around 5 mph. Chance of precipitation is 80%. Thursday: Showers likely, mainly before 9am. Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 66. West wind 5 to 8 mph. Chance of precipitation is 60%. Thursday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 57. Light and variable wind becoming south 5 to 9 mph in the evening. Friday: A 20 percent chance of showers and thunderstorms before 9am. Partly sunny, with a high near 79. Breezy, with a south wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 33 mph. Friday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after midnight. Low around 59. South wind around 15 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. Saturday: A 50 percent chance of showers before noon. Mostly cloudy, with a high near 69. Saturday Night: Partly cloudy, with a low around 41. Sunday: Sunny, with a high near 65. Sunday Night: Mostly clear, with a low around 47. Monday: Sunny, with a high near 77. Monday Night: A 30 percent chance of showers and thunderstorms. Mostly clear, with a low around 60. Tuesday: Showers and possibly a thunderstorm. High near 77. Chance of precipitation is 80%. Tuesday Night: Showers and possibly a thunderstorm. Low around 52. Chance of precipitation is 90%. Wednesday: Showers likely. Mostly cloudy, with a high near 63. Chance of precipitation is 70%. | |
| Pontoon Beach IL 38.73°N 90.06°W (Elev. 423 ft) | |
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