Weather in Genoa in September

Prime time. If you get to pick your dates, September is the one. Highs average 26.4 °C, lows 17.3 °C, and rain falls on 9 days — nothing in the month is working against you.

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

Rain on 9 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: 4 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest September day reached 35 °C and the coldest night fell to 8.6 °C, and the wettest single day dropped 58 mm — roughly 95% 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 113 mm against 22 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 61 mm average is a reasonable planning figure, not a promise.

Wind is light at 5.5 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 69%.

How September sits in the year

The month is on the way down: 4.3 °C cooler than August, with October dropping another 5.3 °C. The first week and the last are not the same trip.

Daylight in September

12.6 hours of daylight, losing 1.5 hours across the month. That is between Genoa's extremes of 15.5 and 8.9 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 22.5 °C in September — comfortable for a proper swim. This is the warmest the water gets all year.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead.

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

September in Genoa versus nearby

If Genoa is one option among several, the nearby comparison is worth making. Milan is close enough to be a coin toss — within a degree on temperature, 1 day more rain. Nice is close enough to be a coin toss — 3.4 °C cooler, 2 days less rain.

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

Every month in Genoa

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