Mid-November through mid-April, with the optimal window being late February through late March for the best balance of weather, fewer crowds than peak December–January, and pre-hurricane-season conditions. Daytime highs in the mid-to-upper 70s°F, low humidity, minimal rainfall (Key West is Florida's driest city at ~40 in/year), and clear sunny days. Outside this window, summer brings heat, humidity, and Atlantic hurricane season (June 1–November 30)
| Month | High (°F) | Low (°F) | Notes |
|---|---|---|---|
| Jan | 73 | 69 | warm & mostly dry |
| Feb | 74 | 70 | warm & mostly dry |
| Mar | 75 | 72 | warm & sunny |
| Apr | 77 | 75 | warm & mostly dry |
| May | 80 | 77 | warm & changeable |
| Jun | 83 | 80 | warm & changeable |
| Jul | 84 | 81 | warm & changeable |
| Aug | 85 | 82 | hot & wet |
| Sep | 84 | 81 | warm & wet |
| Oct | 82 | 79 | warm & changeable |
| Nov | 78 | 75 | warm & mostly dry |
| Dec | 75 | 72 | warm & mostly dry |