Nettuno's winters are mild, with temperatures rarely dipping below 0°C and averaging around 8-10°C in January and December. As spring arrives, temperatures gradually warm up, reaching averages of 13°C in April and 17°C in May. Summer is hot and dry, with peak temperatures often hitting 37°C in June, July, and August, but also bringing warmth and sunshine to the region. Autumn is mild, with temperatures cooling down to around 14°C in November before warming up slightly again in December. Overall, Nettuno enjoys a pleasant Mediterranean climate, with moderate temperatures throughout the year.