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Key Largo Chamber of CommerceKey Largo, FL Weather Forecast
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Key Largo Weather Forecast
| TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
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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 |
| Lo: 80°FLo: 27°C | Hi: 89°FHi: 32°C | Lo: 80°FLo: 27°C | 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 | Lo: 79°FLo: 26°C | Hi: 89°FHi: 32°C |
| POP: 60% | POP: 70% | POP: 70% | POP: 80% | POP: 70% | POP: 60% | POP: 30% | POP: 40% | POP: 60% | POP: 60% | POP: 50% | POP: 60% |
POP = Probability of Precipitation.
Weather Outlook Updated: 354 PM EDT Mon Sep 21 2026 
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Issued: 1021 PM EDT Mon Sep 21 2026
Key Messages
- Heavy rainfall is possible at times tonight. There is a marginal risk for excessive rainfall through Tuesday morning.
- Rain chances will increase further by the middle of the week as tropical moisture spreads into the area.
- Drier air associated with a cold front will arrive late week and into the weekend will bring a lower risk of excessive rainfall, though some rain chances will linger.
Discussion
... Issued at 926 PM EDT Mon Sep 21 2026
An unusual broad upper trough blankets the Gulf o...