Weather in Rome in May

Prime time. May is about as good as Rome gets. Highs average 24.6 °C, lows 14 °C, and rain falls on 10 days — nothing in the month is working against you.

May ranks 2 of 12 in Rome. Only April scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain on 10 days, 1 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

The averages here are honest — no hidden extremes worth planning around. Across the twenty years measured, the hottest May day reached 32.8 °C and the coldest night fell to 5.6 °C, and the wettest single day dropped 44 mm — roughly 77% of the month's rain in one day.

May is moderately variable: 11 mm in the driest year against 112 mm in the wettest, around an average of 57 mm. Roughly two Mays in three land near that average, and the third does something else entirely.

Wind is light at 8.2 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 68%.

How May sits in the year

The month is on the way up: 4.2 °C warmer than April, and June adds another 5 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in May

14.5 hours of daylight, gaining 1 hours across the month. That is between Rome's extremes of 15.2 and 9.2 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 18.4 °C in May — swimmable, but it takes a moment to commit. The sea peaks at 25.8 °C in August and bottoms out at 14 °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

Peak season. Expect the highest prices of the year and to be booking well ahead. If the dates are flexible, March is the trade worth considering — 12 points weaker on weather, and materially quieter.

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

May in Rome versus nearby

If Rome is one option among several, the nearby comparison is worth making. Naples is close enough to be a coin toss — within a degree on temperature, 1 day less rain. Positano is close enough to be a coin toss — 4.9 °C cooler, 2 days less rain.

So: May is effectively as good as it gets here — 0 points behind April, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Rome

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