When to Go
In high season, from mid-December through mid-April, traffic is inevitably heavy. From November to mid-December, crowds are thinner, the weather is superlative, and hotels and shops drastically reduce their prices. Summer is a second high season, especially among families, Europeans, bargain-seekers, and lobster divers.
Florida is rightly called the Sunshine State, but it could also be dubbed the "Humidity State." From June through September, 90% humidity levels are not uncommon. Thankfully, the weather in the Keys is more moderate than in mainland Florida. Temperatures can be 10°F cooler during the summer and up to 10°F warmer during the winter. The Keys also get substantially less rain than mainland Florida, mostly in quick downpours on summer afternoons. In hurricane season, June through November, the Keys get their fair share of warnings; pay heed, and evacuate earlier rather than later, when flights and automobile traffic get backed up.