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St. Marks School Weather Forecast
| TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY |
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| Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Sunny | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm |
| Lo: 80°FLo: 27°C | Hi: 91°FHi: 33°C | Lo: 81°FLo: 27°C | Hi: 91°FHi: 33°C | Lo: 81°FLo: 27°C | Hi: 91°FHi: 33°C | Lo: 81°FLo: 27°C | Hi: 91°FHi: 33°C | Lo: 81°FLo: 27°C | Hi: 91°FHi: 33°C | Lo: 81°FLo: 27°C | Hi: 90°FHi: 32°C |
| POP: 50% | POP: 30% | POP: 50% | POP: 50% | POP: 40% | POP: 40% | POP: 50% | POP: 50% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 222 PM EDT Fri Aug 21 2026 
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Issued: 700 PM EDT Fri Aug 21 2026
Key Messages
Updated at 700 PM EDT Fri Aug 21 2026- Heat index values peak between 105-110 degrees today with a Heat Advisory in effect only for Miami-Dade and Broward counties.
- Scattered thunderstorms expected after midday and into the evening. A couple of stronger storms are possible that could produce near-severe winds.
Aviation
... (00Z TAFS) Issued at 700 PM EDT Fri Aug 21 2026
Southeasterly winds around 10 kts at east coast terminals will become L/V overnight, then increase after 16Z as the Atl...