Weather in Key West in June

Shoulder season. June is shoulder season in Key West — cheaper, quieter, and a genuine gamble. You should expect rain on 22 days of the month, which is more days wet than dry.

June ranks 9 of 12 in Key West: past the worst of the year but short of January, which is the month to book if the dates are open.

Rain on 22 of the month's 30 days, 4 of them heavy. At that frequency a wet-weather backup is not a contingency, it is the itinerary — book the indoor things first and treat the clear days as the bonus. Pack for 28.8 °C days and 27.9 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: the day barely swings — 0.9 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest June day reached 30.6 °C and the coldest night fell to 25.5 °C, and the wettest single day dropped 83 mm — roughly 53% of the month's rain in one day.

June is moderately variable: 26 mm in the driest year against 468 mm in the wettest, around an average of 157 mm. Roughly two Junes in three land near that average, and the third does something else entirely.

Wind is light at 14.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 78%, high enough to notice on the warm days without dominating them.

How June sits in the year

Temperatures hold steady either side: 27.1 °C in May, 28.8 here, 29.5 in July. Nothing about the timing within the month matters much. Rain has already shifted: 8 days more than May had.

Daylight in June

June is at or near the longest days of Key West's year: 13.6 hours of daylight, holding steady all month. Evenings are the real gain — dinner outdoors still happens in full light.

Sea temperature

The sea sits at about 28.6 °C in June — warm enough that the water offers no relief from the heat. The sea peaks at 29.9 °C in August and bottoms out at 24.9 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

June in Key West versus nearby

If Key West is one option among several, the nearby comparison is worth making. Miami is close enough to be a coin toss — within a degree on temperature, 3 days more rain. Cape Coral is close enough to be a coin toss — within a degree on temperature, 4 days more rain.

So: June is a compromise. January is 34 points better and is what Key West is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Key West

See all twelve months in Key West, or where else to go in June.