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Grassy Key Weather Forecast
| TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
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| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm |
| Hi: 89°FHi: 32°C | Lo: 79°FLo: 26°C | Hi: 89°FHi: 32°C | Lo: 80°FLo: 27°C | Hi: 89°FHi: 32°C | Hi: 89°FHi: 32°C Lo: 80°FLo: 27°C | Hi: 89°FHi: 32°C Lo: 80°FLo: 27°C | Hi: 89°FHi: 32°C Lo: 80°FLo: 27°C | Hi: 89°FHi: 32°C Lo: 80°FLo: 27°C | Hi: 89°FHi: 32°C Lo: 80°FLo: 27°C | Hi: 89°FHi: 32°C Lo: 80°FLo: 27°C | Lo: 80°FLo: 27°C |
| POP: 50% | POP: 50% | POP: 50% | POP: 70% | POP: 70% | POP: 60% | POP: 60% | POP: 70% | POP: 70% | POP: 60% | POP: 60% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 346 AM EDT Sat Sep 19 2026 
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Issued: 152 PM EDT Sat Sep 19 2026
Key Messages
- Well above normal rain chances (around 60-70%) will persist across the Florida Keys through the weekend and into early next week.
- Heavy rainfall is expected at times. There is a marginal risk for excessive rainfall through Monday morning.
- While breezes will be light to gentle (5 to 10 mph) throughout the weekend, gusty winds and locally hazardous seas are expected in the vicinity of thunderstorms.
Aviation
... (18Z TAFS) Issued at 144 PM EDT Sat Sep 19 2026 VFR conditions continue at t...