Hello Giovanna,
well june is normally quiet warm in Tuscany, so I would suggest you to bring light and comfortable clothes but most of all comfortable shoes! I guess you'll walk a lot and in Tuscany there are many climbs especially when you visit medieval villages!
For the evening and the night I would keep on hand a light jacket or a sweater and long trausers but probabily you won't need them! Even if Tuscany is considered the region of the sun, it happens to rain and the temperatures go down, in this case you may need a light scarf or shawl and an umbrella!
Hope you'll enjoy your holiday!
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