Weather Practicalities

Here's a good link for an overview of weather in October:  http://www.italylogue.com/planning-a-trip/italy-in-october.html

and for September:  http://www.italylogue.com/planning-a-trip/italy-in-september.html

and here is a chart of averages for Siena:  http://www.weather.com/outlook/travel/businesstraveler/wxclimatology/monthly/graph/ITXX072

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Sounds like we should all have light jackets and shawls, and the always sage traveler's advisory to be able to layer.  I remember being in Italy in September and there being rain, so a small travel umbrella is probably a good idea.