Florence in September: what to expect

September is the hinge between the Florentine summer and autumn. The first week still feels like August: afternoons near 30 °C, warm evenings, the Arno valley hazy. By the last week highs sit around 22–23 °C and you want a jacket after dark. Rain returns in short, heavy afternoon bursts rather than all-day drizzle — the pattern that makes November the wettest month of the year here.

The city sits in a bowl, so heat lingers longer than in the surrounding hills. Fiesole, 20 minutes by bus from Piazza San Marco, is usually 2–3 °C cooler and worth the trip on a warm afternoon. Daylight drops from about 13 hours on 1 September to 11.5 by the 30th, which matters if you plan to photograph the Duomo at sunset.

September is still high season in Florence. The August exodus is over, Italians are back at work, and the city fills with visitors who deliberately avoided the heat. Expect queues at the Duomo complex, the Uffizi and the Accademia, and a crush in the streets between Piazza della Signoria and Santa Croce in the middle of the day.

The good news is that everything is open again. Many family-run trattorias and workshops close for two or three weeks in August; by September they are back, and the market at San Lorenzo and Sant'Ambrogio is in full swing. Hotel rates stay near peak until early October, then drop sharply. If you have flexibility, the last ten days of September give you the same weather with slightly thinner crowds.

The month's signature event is the Festa della Rificolona on 7 September, when children carry paper lanterns on sticks from Piazza Santa Croce toward Piazza Santissima Annunziata, marking the old eve-of-Nativity fair that brought farmers into the city. It is free, crowded and mostly local.

In the hills, the Chianti vendemmia (grape harvest) runs from early September into October. Several estates between Greve, Panzano and Radda open for tastings and harvest days; some require booking. Florence itself also hosts the Rassegna di Teatro in the piazzas and the Pitti Uomo menswear fair, which fills hotels in mid-month — check the exact dates before booking. The Venice Film Festival, early in the month, pulls some of the international crowd away from Florence for a few days.

September is the month to use Florence as a base for day trips. The Chianti road south through Greve and Panzano is at its best with the harvest underway, and the hill towns — San Gimignano, Siena, Lucca, Arezzo — are warm but no longer punishing. Trains to Siena and Lucca run hourly and take 1–1.5 hours.

In the city, start early. Book the Uffizi and Accademia for the first slot of the day, then walk the Oltrarno — Santo Spirito, Piazza del Carmine, the Boboli Gardens — while the centre is packed. Late afternoon is the time for Piazzale Michelangelo and San Miniato al Monte, when the light drops behind the hills and the heat has gone. If you want a swim, Viareggio and the Versilia coast are about 1.5 hours by train and the sea is still warm.

Pack for two seasons in one month. Light cotton or linen for the first week, a light jacket or sweater for evenings later on, and one compact rain jacket or umbrella for the afternoon storms. Comfortable walking shoes matter more than anything else: Florentine streets are cobbled and you will cover 8–12 km a day without noticing.

Churches including the Duomo and Santa Croce require covered shoulders and knees, so carry a light scarf or shawl even in the heat. A refillable bottle helps — Florence has public drinking fountains (fontanelle) across the centre. Bring a small day bag rather than a backpack for museum visits, as large bags must be checked at the Uffizi and Accademia.

August is hot and half-closed: many restaurants and shops shut for Ferragosto around 15 August, and daytime temperatures push past 35 °C. July is hotter still. October is the closest match to September — cooler, cheaper, with truffle and olive season starting — while November is the wettest month in Florence and the quietest for city breaks.