May and September. May has long daylight, gardens in flower, and manageable crowds. September gives you post-summer temperatures in the low 20s°C, pl…
April and October. April still has some rain, but it's quiet and cheaper — good for the Duomo and Torre del Mangia queues. Octobe…
Come in late May or early September for the best Siena: bright, warm, and walkable without the crush.