Hi from Fabio.
I live in Udine and I've been working for many years also in Venice. September in North East Italy and specially Udine, are Months of days that begin sonny and then in the afternoon they turn to rain showers.
Is better you take with you pullover and umbrellas for the afternoon. However also in the "better Septembers " it's never so hot as in the summer. These are the last days of summer, but mild days.
If want contact me when you come in Udine I'll give you any kind of suggestion and Help! Ciao
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