Weather in Positano in September

Prime time. If you get to pick your dates, September is the one. Highs average 24.4 °C, lows 22.2 °C, and rain falls on 11 days — nothing in the month is working against you.

September ranks 5 of 12 in Positano: past the worst of the year but short of July, which is the month to book if the dates are open.

Rain on 11 days, 2 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: it never really gets hot: not one day in an average September reaches 30 °C; the day barely swings — 2.2 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest September day reached 30.3 °C and the coldest night fell to 17.3 °C, and the wettest single day dropped 37 mm — roughly 48% of the month's rain in one day.

September is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest September on record still delivered 134 mm against 24 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 77 mm average is a reasonable planning figure, not a promise.

Wind is light at 12.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 70%.

How September sits in the year

The month is on the way down: 2.4 °C cooler than August, with October dropping another 3 °C. The first week and the last are not the same trip. Rain has already shifted: 6 days more than August had.

Daylight in September

12.5 hours of daylight, losing 1.3 hours across the month. That is between Positano's extremes of 15.1 and 9.3 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 24.9 °C in September — warm enough to stay in as long as you like. This is the warmest the water gets all year.

How busy it gets

Busy. Popular without being frantic; book the things you care about, improvise the rest.

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

September in Positano versus nearby

If Positano is one option among several, the nearby comparison is worth making. Naples is close enough to be a coin toss — 3.6 °C warmer, 1 day less rain. Bari is close enough to be a coin toss — 3.1 °C warmer, 2 days less rain.

So: September works, with July the better month by 11 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Positano

See all twelve months in Positano, or where else to go in September.