Weather in Miami in May

A good month. May is a solid month to be in Miami. You should expect rain on 16 days of the month, which is more days wet than dry.

May ranks 7 of 12 in Miami: past the worst of the year but short of January, which is the month to book if the dates are open.

Rain on 16 days, 4 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: the day barely swings — 2.4 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest May day reached 31.9 °C and the coldest night fell to 20 °C, and the wettest single day dropped 75 mm — roughly 55% of the month's rain in one day.

May is moderately variable: 43 mm in the driest year against 338 mm in the wettest, around an average of 136 mm. Roughly two Mays in three land near that average, and the third does something else entirely.

Wind is light at 15.4 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 75%, high enough to notice on the warm days without dominating them.

How May sits in the year

Temperatures hold steady either side: 26.1 °C in April, 27.5 here, 29 in June. Nothing about the timing within the month matters much. Rain is the thing that moves: June brings 9 days more of it, so the earlier half of a flexible trip is the safer half.

Daylight in May

May is at or near the longest days of Miami's year: 13.4 hours of daylight, gaining 0.5 hours across the month. Evenings are the real gain — dinner outdoors still happens in full light.

Sea temperature

The sea sits at about 27 °C in May — warm enough that the water offers no relief from the heat. The sea peaks at 29.7 °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

Quiet. Few other visitors, cheaper rooms, and a real chance some seasonal operators are shut.

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

May in Miami versus nearby

If Miami is one option among several, the nearby comparison is worth making. Cape Coral is the weaker option in May — 2.7 °C warmer, 1 day less rain. Key West is close enough to be a coin toss — within a degree on temperature, 2 days less rain.

So: May is a compromise. January is 20 points better and is what Miami 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 Miami

See all twelve months in Miami, or where else to go in May.