Frankfurt in May

April through October offers the best weather, with temperatures ranging from 15-25°C. May and September hit the sweet spot — warm days, fewer crowds, and outdoor beer gardens in full swing. Summer brings festivals and outdoor events, but also higher hotel prices and tourist crowds. The Christmas market from late November through December transforms Römerberg square into something magical, though you'll need warm clothes and patience for crowds. Winter (January-March) sees gray skies and temperatures around 5°C, but museum hopping becomes more appealing and hotel rates drop significantly. Spring arrives early here — cherry blossoms bloom along the Main River in April. Avoid major trade fair weeks when hotel prices spike and the city fills with business travelers. Check the Messe Frankfurt calendar before booking.