Hi Steve,
As summer ends and autumn begins, Lake Como starts to cool down. October in Lake Como is a lot warmer than October in the United Kingdom though, so it makes a great escape from the winter weather. Average daily temperatures tend to stay around 13°C although higher temperatures of 16°C are not unusual. Temperatures do fall at night in Lake Como, with low temperatures of around 10°C, so you may want to pack a jacket to wear on an evening.
I hope this helps.
Kind Regards,
Mildred