I'm a Florida girl. In other words, I never know what to pack when it's not shorts season!!
You can check historical weather here
This is Rome November 2025
https://www.timeanddate.com/weather/italy/rome/historic?month=11&year=2025
We were in Rome, CT and Lucca in early November a few years ago - weather was changeable, with some warm days, some showers both overnight and during the day - we were rained on at the Forum - and gale force winds and rain in Monterosso. Most evenings were cool but pleasant. So plan on layers, a light jacket - preferably waterproof - and waterproof shoes.
I like to take an XXL rain jacket I bought out of necessity years ago in Berlin. Because it's huge, it fits over my backpack and the SLR-type camera in front, and ends just below my hips. It's also good as a windbreaker over my fleece jacket in colder weather. You might want a fleece jacket for evenings, but I doubt it. I'd bring sandals and shoes that are water-resistant and have good traction. Other than that, I'd expect warm sunny weather - could still be shorts season on some days. I've been in all three cities in February in short sleeves. Look for a couple of stylish scarves to buy for evening wear.
Generally in the high 60s to low 70s during the day, and in the very low 50s (or even high 40s) at night.
Rain is possible, actually likely, as it is the rainiest time of the year, at least historically.
However you can never know. Some years the weather is a bit outside the norm, but that is the historical record.
The day before you depart, check the weather forecast for the 10 days following your departure date, to have a more reliable assessment of the weather at the time.
We were in Italy for the first three weeks of November '25 and the first part of the trip was unseasonably warm (Milan, Genoa, Florence), including running the AC in Florence and a day of torrential rain in Genoa, when I wished I had packed more lightweight clothes and comfortable waterproof shoes. Then the middle part was mostly seasonal but with two days in Bologna that were downright cold and I wished for a quilted vest even as I was wearing two layers of sweaters over a long-sleeve T-shirt. And finally Rome had gorgeous, sunny autumn weather and I actually had the right clothes (though I coveted the chunky boots all the fashionable Italian women were wearing).
Check the weather forecast right before you leave and pack clothes you can easily layer. We are going back this November to Rome, Bologna and Venice, and I'm adjusting my packing list to include a couple button front shirts that I can layer under a pullover/cardigan or wear on their own, a lightweight zip up jacket that I can wear under my raincoat if needed, and chunky waterproof ankle boots that are comfortable to walk in (in addition to the walking shoes that served me well last time).