Weather WorldUnion Lake, MO Weather Forecast
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Union Lake Weather Forecast
| TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | TUESDAY | TUESDAY NIGHT |
 |  | |  | | |  | | | | |  |
| Clear | Patchy Fog | Clear | Sunny | Clear | Mostly Sunny | Chance of Rain | Mostly Sunny | Mostly Clear | Mostly Clear | Sunny | Partly Cloudy |
| Lo: 59°FLo: 15°C | Hi: 85°FHi: 29°C | Lo: 60°FLo: 16°C | Hi: 89°FHi: 32°C | Lo: 61°FLo: 16°C | Hi: 85°FHi: 29°C | Lo: 55°FLo: 13°C | Hi: 81°FHi: 27°C | Hi: 90°FHi: 32°C Lo: 59°FLo: 15°C | Hi: 90°FHi: 32°C Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C | Lo: 50°FLo: 10°C |
| POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 348 PM CDT Wed Oct 07 2026 
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Issued: 223 PM CDT Wed Oct 7 2026
Key Messages
- Dry weather with unseasonably warm temperatures are forecast through early next week.
- The remnants of Tropical Cyclone Isaias may bring (beneficial) rain to parts of southeast Missouri and southwest Illinois this weekend, but there remains a lot of uncertainty with its track.
Aviation
/18Z TAFS THROUGH 00Z FRIDAY/... Issued at 1124 AM CDT Wed Oct 7 2026
A weak cold front will move through the region, with winds veering more to the northwest in its wake. Light/variable winds are forecast...