Porto, Portugal is most comfortable in January, February, March. The toughest month for heat is July (comfort 79/100). In August, daytime highs average 24.6°C (feels like 25.9°C) with 2.4 days over 30°C and 1 tropical nights.
| Month | Avg high | Avg low | Feels like | Days ≥30°C | Days ≥35°C | Nights ≥20°C | Comfort |
|---|---|---|---|---|---|---|---|
| January | 13.9° | 7.7° | 11.6° | 0 | 0 | 0 | 100 |
| February | 15.6° | 8.6° | 13.5° | 0 | 0 | 0 | 100 |
| March | 16.2° | 9.1° | 14.4° | 0 | 0 | 0 | 100 |
| April | 18.5° | 10.9° | 18.1° | 0 | 0 | 0 | 100 |
| May | 20° | 12.6° | 20.3° | 0.2 | 0 | 0 | 100 |
| June | 22.4° | 15.3° | 23.7° | 1 | 0 | 0.6 | 98 |
| July | 24.6° | 16.5° | 26° | 4.2 | 0.4 | 3 | 79 |
| August | 24.6° | 16.6° | 25.9° | 2.4 | 0 | 1 | 85 |
| September | 22.8° | 15.6° | 23.2° | 0.4 | 0 | 0.4 | 99 |
| October | 21.1° | 14.7° | 21° | 0.4 | 0 | 0 | 100 |
| November | 17° | 11.1° | 15.6° | 0 | 0 | 0 | 100 |
| December | 14.6° | 9° | 12.7° | 0 | 0 | 0 | 100 |
No. August daytime highs in Porto average a comfortable 24.6°C with 2.4 days over 30°C — it's a solid summer choice for avoiding extreme heat.
Based on 5 years of climate data, the most comfortable months in Porto are January, February, March. The toughest month for heat is July, scoring 79/100 on our heat-comfort index.
In August, nights in Porto average a low of 16.6°C, with 1 tropical nights per month (nights that stay at or above 20°C) — a key factor for sleep quality if your stay has no air conditioning.
Tell us where and when you're going. If a heatwave becomes likely for your dates, we'll email you early — with cooler day-by-day alternatives nearby.