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Chesterfield, MO Weather Forecast
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Chesterfield Weather Forecast
| OVERNIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY |
 |  |  |  |  | | | | | |  |  |
| Clearing | Chance of T-Storm | Chance of T-Storm | Sunny | Mostly Clear | Mostly Sunny | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of Showers |
| Lo: 75°FLo: 24°C | Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C | Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C | Hi: 91°FHi: 33°C Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C Lo: 71°FLo: 22°C | Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C Lo: 61°FLo: 16°C |
| POP: 20% | POP: 20% | POP: 40% | POP: 40% | POP: 20% | POP: 40% | POP: 40% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1048 PM CDT Wed Sep 16 2026 
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Issued: 1112 PM CDT Wed Sep 16 2026
Key Messages
- A late season heat wave continues through at least Saturday with peak heat index values of 100-105F+ along/south of I-70. Areas just north of I-70 have been added to the Heat Advisory, and the rest of the advisory has been extended to Saturday.
- Isolated to scattered thunderstorms are expected this afternoon. These storms are not expected to strong enough to produce severe weather, though small hail, gusty winds, and brief heavy downpours are possible.
Aviation
/00Z TAFS THROUGH 06Z FRI...