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Briar, MO Weather Forecast
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| THIS AFTERNOON | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY |
 |  | |  |  | |  | | | | | |
| Sunny | Mostly Clear | Mostly Sunny | Partly Cloudy | Chance of T-Storm | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Clear | Mostly Clear | Partly Cloudy | Partly Cloudy |
| Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C | Lo: 70°FLo: 21°C | Hi: 91°FHi: 33°C | Hi: 81°FHi: 27°C Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C Lo: 65°FLo: 18°C | Lo: 59°FLo: 15°C | Hi: 80°FHi: 27°C Lo: 55°FLo: 13°C | Hi: 80°FHi: 27°C Lo: 55°FLo: 13°C | Hi: 81°FHi: 27°C Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C Lo: 59°FLo: 15°C |
| POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 127 PM CDT Sat Sep 19 2026 
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Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 1200 PM CDT Sat Sep 19 2026
Key Messages
- A Heat Advisory remains in effect this weekend, with high temperatures 15 to 20 degrees above normal in the middle 90s to near 100 degrees.
- The passage of a cold front will begin a cooling trend by Monday. Temperatures by Tuesday finally cool closer to or even a little below seasonal normals, where they hold through the end of the week.
- The cold front brings 40-70% chances of showers and storms late Sunday night through Tuesday, with the highest chances Monday into Monday night.