Weather in Naples in May

How May compares

May is the 5th warmest month of the year in Naples and ranks 87th of 134 destinations we compare for May - see where else is hot in May. Within Italy it is 6th of 16 (Italy in May). Against London's average high of 16.6°C in May, Naples is 5.1°C warmer by day and 5.3°C warmer at night.

Daytime and night-time in May

The typical May day in Naples peaks at 21.7°C, but that is an average: the warmest 10% of days reach 25.6°C or more. Roughly 1 in 7 days top 25°C and 1 in 333 pass 30°C. Nights average 13.6°C; one night in ten drops to 10.6°C or lower, so pack a layer for evenings - it is genuinely cool after dark. Between 1991 and 2020 the hottest May day here reached 33.2°C (2020-05-16) and the coldest night 5.6°C (2019-05-07).

Rain in May

Wet (more than 8 rainy days): about 9 days with 1 mm or more, 63 mm in total. Year to year it varies a lot - the wettest May was 2019 with 141 mm, the driest 1992 with 6 mm. Humidity averages 76%.

Sea temperature in May

The sea averages 18.9°C - bracing (18-22°c). Depending on the year it ranges from 17.6°C to 20.1°C. For the warmest sea here, come in August (26.4°C).

Sunshine and daylight

Around 7.6 hours of sunshine a day (estimated from cloud cover), 14.3 hours of daylight: the sun rises about 05:45 and sets about 20:13 local time in mid-May. Average cloud cover is 47%.

Is May a good time to visit Naples?

It is a reasonable choice: warm days but expect showers. The best months for Naples on our scoring are July, August, June; months averaging 25°C or more: Jun, Jul, Aug, Sep.

Warm enough for light clothes, but pack a layer

May suits travellers who prefer walking around in warmth to dealing with strong heat throughout the day. The average daytime high makes light clothing a sensible starting point, though sunshine can make a midday break in the shade welcome. Only 15% of days reach 25°C, so do not plan on consistently hot conditions. Evenings call for a jumper or light jacket, especially if you want to sit outside. The coldest 10% of nights fall to around 11°C or below, making an extra layer more useful than a suitcase packed entirely for summer. Choose clothes you can add or remove easily.

Allow for rain rather than expecting an entirely dry break

Rain is a real planning consideration in May, not something to dismiss because the afternoons are warm. About 8 days receive measurable rain, so a short stay can still include wet weather. That does not mean those days are washouts, but it does make a flexible schedule sensible. Keep a lightweight waterproof handy and avoid making every plan dependent on being outdoors. Long daylight hours give you room to shift a walk when conditions improve, without guaranteeing a dry spell. May is a better fit for someone happy to adapt than for someone whose holiday depends on uninterrupted outdoor weather.

Treat swimming as optional

The sea averages 18.9°C in May, which is bracing rather than comfortably warm. If you enjoy cooler water, a swim may appeal, but do not assume that a pleasant afternoon on land means the water will feel equally welcoming. The year-to-year range is 18°C to 20°C, still below the 22°C benchmark for warmer swimming conditions. Pack swimwear if you like, but make it an option rather than the basis of the trip. Naples in May makes more sense for a city stay with possible time by the water than for a holiday built around long, relaxed swims.