SpringMarch - May
Mild, wet, and quiet before the summer crowds; the gorge's woodland is at its greenest and the harbour terraces reopen for outdoor drinking.
Spring is an easy, uncrowded season in Bristol. The Avon Gorge's woodland flushes green through April and May, the harbourside bars put tables out the moment the rain stops, and the main attractions run without the summer queues. It is also when the University of Bristol's academic year is still in full swing, so the city feels lived-in rather than emptied out. Expect regular showers off the Bristol Channel; layer up and treat a wet morning as the cue for M Shed or the Museum & Art Gallery, both free and both excellent.
SummerJune - August
Peak season, and the one with the two headline events: the Balloon Fiesta in early August and FORWARDS Festival on the Downs later in the month.
Summer is Bristol's loudest season. The Bristol International Balloon Fiesta fills Ashton Court with hundreds of hot air balloons for a free August weekend, and FORWARDS Festival takes over the Downs for a two-day music line-up a few weeks later; both push accommodation prices up across the city, so book ahead if your visit lines up with either. Outside festival weekends, the Harbourside is at its best: boats out on the water, the ferries running a full timetable, and evening light on the gorge from the bridge. It is also the wettest-feeling city in England on a bad day, so do not assume guaranteed sun even in August.
AutumnSeptember - November
Encounters Film Festival takes over the Arnolfini and other venues in late September, and the gorge's woodland turns before the Christmas market rush begins in November.
Early autumn suits Bristol's indoor and cultural side: Encounters, the international short film festival, runs at the Arnolfini and around the city in late September, term starts at the university and the streets around the centre fill back up, and Leigh Woods across the gorge turns properly gold through October. The Christmas market sets up in Broadmead and around Cabot Circus from early November, which is the cue that the year's busiest and most commercial weeks are approaching; come in October for the city at its most walkable, before the market crowds and the wet, dark evenings of December set in.
WinterDecember - February
The Christmas market runs into late December around Cabot Circus and Broadmead; outside it, winter is Bristol's quiet, indoor season, and a good one for the museums and the fine-dining tables.
Bristol's Christmas market runs for close to seven weeks from early November, which makes it more a background feature of the season than a single event to plan around; expect crowds and lights around Broadmead and Cabot Circus for most of that window. Once the market packs away, the city drops into a quiet, damp winter that rewards indoor plans: the free permanent collections at M Shed and the Museum & Art Gallery, a tasting menu at Bulrush, or cider at the Coronation Tap by the bridge. The gorge and the Downs can be genuinely bleak and windswept in short winter daylight, so save the big outdoor walks for a clear cold morning rather than a grey afternoon.