Late spring (April-May) or early autumn (September-October). Warm and sunny with daytime highs of 68-79F, significantly fewer crowds than July-August, lower hotel rates, and green parks. September still warm enough for nearby beaches (avg high ~79F/26C) while summer crowds have thinned. April-May offers festivals and blooms. Both shoulder periods avoid peak-season queues at Alfama, Tram 28, and Belem
| Month | High (°F) | Low (°F) | Notes |
|---|---|---|---|
| Jan | 57 | 48 | cool & mostly dry |
| Feb | 58 | 48 | cool & mostly dry |
| Mar | 62 | 51 | mild & mostly dry |
| Apr | 65 | 54 | mild & mostly dry |
| May | 71 | 58 | mild & mostly dry |
| Jun | 76 | 62 | warm & sunny |
| Jul | 80 | 64 | warm & sunny |
| Aug | 81 | 65 | warm & sunny |
| Sep | 78 | 64 | warm & mostly dry |
| Oct | 72 | 61 | mild & changeable |
| Nov | 63 | 54 | mild & changeable |
| Dec | 58 | 50 | cool & changeable |