Porto · September
Low seasonPortugal · Europe
Climate Overview
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ø day, range from coolest to warmest dayØ dayrange | 14° (57°)9– (48–)17 (63) | 15° (59°)10– (50–)20 (68) | 17° (63°)11– (52–)23 (73) | 18° (64°)13– (55–)26 (79) | 21° (70°)15– (59–)30 (86) | 23° (73°)17– (63–)31 (88) | 24° (75°)19– (66–)34 (93) | 25° (77°)20– (68–)33 (91) | 24° (75°)18– (64–)32 (90) | 22° (72°)16– (61–)27 (81) | 17° (63°)12– (54–)22 (72) | 15° (59°)11– (52–)19 (66) |
Ø night, range from coldest to warmest nightØ nightrange | 7° (45°)1– (34–)13 (55) | 8° (46°)1– (34–)12 (54) | 9° (48°)2– (36–)14 (57) | 11° (52°)4– (39–)15 (59) | 13° (55°)8– (46–)17 (63) | 15° (59°)10– (50–)19 (66) | 16° (61°)11– (52–)20 (68) | 16° (61°)11– (52–)20 (68) | 15° (59°)10– (50–)19 (66) | 14° (57°)8– (46–)18 (64) | 10° (50°)3– (37–)15 (59) | 8° (46°)2– (36–)14 (57) |
☀️Sunshine | 5h | 6h | 7h | 8h | 9h | 10h | 11h | 10h | 8h | 6h | 5h | 5h |
🌊Water Temp | 14° (57°) | 14° (57°) | 14° (57°) | 15° (59°) | 16° (61°) | 17° (63°) | 17° (63°) | 17° (63°) | 17° (63°) | 17° (63°) | 15° (59°) | 14° (57°) |
🌧Rain Days | 7d99mm (3.9") | 7d82mm (3.2") | 8d90mm (3.5") | 8d82mm (3.2") | 5d56mm (2.2") | 3d29mm (1.1") | 1d9mm (0.3") | 1d16mm (0.6") | 4d49mm (1.9") | 8d113mm (4.4") | 9d119mm (4.7") | 8d103mm (4.1") |
Best travel time current monthØ = average · small figures = range: coolest–warmest day / coldest–warmest nightClimate data 2005–2025 · Source: ERA5 + station data
Post-season — prices falling after the travel period, beaches and attractions quieter.
September is an acceptable travel month for Porto — conditions are fine, though July and August offer even better weather.
Daytime highs average 24°C (75°F), cooling to 15°C (59°F) at night (daily average: 19°C (66°F)). Peaks reach around 32°C (90°F), the coldest nights around 10°C (50°F). The sun shines an average of 8 hours per day; there are 4 rain days with 49 mm (1.9 in) total. At 17°C (63°F), the water is still quite cool in September — a wetsuit may be useful.
A jacket for cool evenings should not be left behind. Sightseeing and excursions can be enjoyed comfortably at this time of year.
Autumn is the winemakers' season: grapes are harvested in the Douro Valley and the quinta estates open for tastings. Porto itself now has its best light — soft afternoon gold on the granite of the old town.
Packing list for Porto in September
- T-shirts and shorts
- Light jacket for cool evenings
- SPF 50 sunscreen
- Sunglasses
- Sun hat
- Small umbrella (occasional showers possible)
- Travel first-aid kit
Frequently Asked Questions
- Is September a good time to visit Porto?
- September is not an optimal month for Porto (Score: 72/100), but it is manageable. For better conditions, consider July and August.
- How warm is it in Porto in September?
- In September, Porto sees daily highs of 24°C (75°F). Nights cool to 15°C (59°F), with a daily average of 19°C (66°F). Peaks reach around 32°C (90°F), the coldest nights around 10°C (50°F).
- How much rain falls in Porto in September?
- In September, Porto receives an average of 49 mm (1.9 in) of rain over 4 rain days. That is comparatively dry.
- How many sunshine hours does Porto get in September?
- Porto averages 8 sunshine hours per day in September — above the annual average.
- How warm is the water in Porto in September?
- Water temperature in Porto in September averages 17°C (63°F) — still quite cool — a wetsuit may be useful.
