Click on a day for an hourly weather forecast
The temperatures in Key West during August are extremely high, between 28°C and hot as 30°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of August in Key West. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Key West in August 2025.
If you’re planning to visit Key West in the near future, we highly recommend that you review the 14 day weather forecast for Key West before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 22° / 20° | 3 | 28 | 0 | 67 mm | Good | Key West in January |
| February | 23° / 21° | 2 | 26 | 0 | 60 mm | Perfect | Key West in February |
| March | 23° / 22° | 1 | 30 | 0 | 36 mm | Perfect | Key West in March |
| April | 25° / 24° | 3 | 27 | 0 | 81 mm | Perfect | Key West in April |
| May | 27° / 26° | 6 | 25 | 0 | 150 mm | Perfect | Key West in May |
| June | 28° / 27° | 9 | 21 | 0 | 198 mm | Good | Key West in June |
| July | 29° / 28° | 10 | 21 | 0 | 221 mm | Ok | Key West in July |
| August | 30° / 28° | 11 | 20 | 0 | 260 mm | Ok | Key West in August |
| September | 29° / 28° | 12 | 18 | 0 | 286 mm | Ok | Key West in September |
| October | 28° / 27° | 8 | 23 | 0 | 251 mm | Good | Key West in October |
| November | 25° / 24° | 3 | 27 | 0 | 93 mm | Perfect | Key West in November |
| December | 24° / 22° | 2 | 29 | 0 | 70 mm | Perfect | Key West in December |