April to mid-June and September to October (shoulder seasons); May and September are the optimal months. Warm and dry weather without peak-summer heat and humidity. Fewer crowds at Pompeii, the Amalfi Coast, and city museums. Spring highs reach the mid-70s°F with wildflowers; September stays warm (highs 80–84°F) with comfortable evenings and a warm sea. U.S. News Travel and Lonely Planet both cite April–May and September as ideal
| Month | High (°F) | Low (°F) | Notes |
|---|---|---|---|
| Jan | 54 | 42 | cool & changeable |
| Feb | 55 | 42 | cool & changeable |
| Mar | 59 | 45 | cool & changeable |
| Apr | 64 | 50 | mild & changeable |
| May | 71 | 56 | mild & changeable |
| Jun | 79 | 64 | warm & mostly dry |
| Jul | 85 | 70 | hot & sunny |
| Aug | 86 | 70 | hot & mostly dry |
| Sep | 79 | 65 | warm & changeable |
| Oct | 71 | 58 | mild & changeable |
| Nov | 63 | 51 | mild & changeable |
| Dec | 56 | 45 | cool & changeable |