Florence Geography, Climate & Nature

Florence lies in the valley of the Arno in central Tuscany, on a floor of flat ground enclosed by hills on nearly every side. The river enters from the east, runs through the centre, and leaves westward towards Pisa and the sea; the historic city grew on the north bank, with the Oltrarno — literally “beyond the Arno” — on the south.

The enclosing hills are close enough to be part of the city rather than a backdrop. Fiesole sits on the ridge to the north-east and was a town before Florence existed; the southern slope rises immediately from the river to San Miniato and Piazzale Michelangelo, which is why a fifteen-minute walk out of the centre produces the view that appears on every postcard. Beyond them the Apennines close the valley to the north.

What the basin does

This geography is not scenery, it is the city's operating condition. The bowl holds summer heat against the stone and holds winter damp and fog on the valley floor. It also concentrated the medieval city into a compact footprint — the World Heritage area is just over five square kilometres — which is why Florence is walkable and why its streets are narrow.

The river is not decorative

The Arno has flooded the city repeatedly, most destructively in November 1966, when water reached heights still marked by plaques on buildings across the centre. The embankments and the bridges, almost all of them rebuilt after wartime demolition in 1944 and again after the flood, are the city's long argument with its own river.

Florence sits inland, in a bowl, which gives it a more continental pattern than Italy's coastal cities at the same latitude. The hills that make the city beautiful also stop the air moving through it, and that single mechanism explains most of what a visitor experiences.

Summer

July and August are the hard months. The basin traps heat, the historic centre is stone and offers very little shade, and the middle of the day on an unshaded square is genuinely punishing rather than merely warm. Early mornings and evenings are the usable hours, which fits the rest of the city's advice anyway. August also empties the centre of Florentines, so the city feels different as well as hotter.

Winter

Winters are cool and often damp, with fog settling on the valley floor and a real chance of rain across November to February. This is the calmest stretch of the year for visitors and the most comfortable for museums, at the cost of short daylight and a city that looks grey rather than golden.

Spring and autumn

Late spring and early autumn give the most pleasant walking weather and, for exactly that reason, the heaviest crowding. The two arrive together in Florence; there is no month that is both mild and quiet, and planning around that trade-off is more useful than hunting for one.

Florence's nature is not inside the city so much as pressed right up against it, and the three settings are close enough that a visitor meets all of them without planning to.

The river corridor

The Arno runs through the centre as a continuous green and water corridor, and the embankments built after the floods keep it wild in a narrow strip that nothing else uses. It is the main route by which wildlife moves through the built-up area.

The Cascine and the parks

The Parco delle Cascine stretches west along the north bank as the city's largest green space, a long wooded park on the floodplain that functions as both recreation ground and habitat. The historic gardens — Boboli above all — add mature, enclosed tree cover in the middle of the stone.

The hills

The slopes rising immediately from the river are olive terrace, cypress, holm oak and vineyard: a worked agricultural landscape rather than a wild one, but an old one, and the setting the Renaissance painters actually looked at. Beyond them the Apennine woodland begins.

What a visitor actually notices in Florence is river wildlife and roof wildlife. The Arno carries grey herons, little egrets, cormorants and mallards through the middle of the city, and the weirs and quiet stretches below the bridges are where they are easiest to see — early morning, from any of the bridges, costs nothing and is the most reliable wildlife watching in the city.

Overhead, swifts nest in the old walls and scream over the squares through the summer evenings; it is one of the city's defining sounds between May and August. Pigeons and gulls work the squares year-round, and the city asks visitors not to feed them.

Up on the hills, the olive terraces and holm oak hold the ordinary Tuscan birdlife — hoopoes, jays, warblers in spring — along with wild boar and roe deer in the woodland further out, which stay well away from the city but are abundant enough in Tuscany to be a familiar presence on local menus.