Averages for Rome in October. Weather lowdown. October is a great time to visit Rome, Italy, when the leaves are turning red and there’s a refreshing chill in the air. At this time of the year, the average temperature starts off at around 19°C and gradually drops until it reaches 14°C-15°C at the end of the month. During October, the city experiences eight hours of sunshine each day and approximately 94mm of rainfall spread across 12 days. There is also an average sea temperatur...