Weather in Bologna in September

Prime time. If you get to pick your dates, September is the one. Highs average 27 °C, lows 15.7 °C, and rain falls on 9 days — nothing in the month is working against you.

September is the highest-scoring month of the twelve. The nearest rival is April, and the month at the other end of the year is December.

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: 7 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest September day reached 37.8 °C and the coldest night fell to 8.5 °C, and the wettest single day dropped 29 mm — roughly 50% 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 116 mm against 28 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 58 mm average is a reasonable planning figure, not a promise.

Wind is light at 6.7 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 64%.

How September sits in the year

The month is on the way down: 6.2 °C cooler than August, with October dropping another 5.5 °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 Bologna's extremes of 15.5 and 8.9 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 32.3 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead. If the dates are flexible, June is the trade worth considering — 13 points weaker on weather, and materially quieter.

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

September in Bologna versus nearby

If Bologna is one option among several, the nearby comparison is worth making. Padua is close enough to be a coin toss — within a degree on temperature, 1 day more rain. Genoa is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: September is the answer for Bologna. If it is booked out or priced out, April is the next best thing at 2 points behind, and December is the month to keep off the shortlist.

Every month in Bologna

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