Autumn Surf in Portugal: What Changes in September
Autumn is when Portugal's surf gets better: from September the summer north wind eases, longer groundswells arrive, the water cools from about 20 °C to 15–16 °C by November, and crowds thin from mid-October.
Published August 31, 2026
Late August is when Portugal's surf year turns over. The nortada that pinned the coast down all summer starts to ease, the first real North Atlantic groundswells arrive, and the water begins its slow slide toward winter. Here's exactly what changes between September and November: swell, wind, water temperature, crowds, and how to plan a trip around it.
Wave type: Seasonal transition · Best season: Sep – Nov · Difficulty: All levels
The nortada finally lets go
The thermal northerly wind that keeps much of the west coast onshore on summer afternoons starts to weaken and lose consistency from mid-to-late September. That opens up clean windows in the morning and afternoon alike, and unlocks spots that only work properly once conditions get more organized.
Real groundswell replaces summer's leftovers
Summer runs mostly on small windswell and leftover groundswell. From September, the North Atlantic storm track wakes back up and starts sending the season's first proper long-period groundswell. Reef and point breaks that need size and shape to work (Coxos, Supertubos, Ribeira d'Ilhas) go from small and soft to genuinely good. Both swell height and consistency climb noticeably through October.
The water starts to drop: the air slower
Water sits around 20–22°C through August, drops to roughly 19–20°C in September, 17–18°C in October and 15–16°C by November. Air stays mild into October, which makes this a good window: warmer air, cooling water. Wetsuit timeline: a 3/2mm covers most of September comfortably; most people switch to a 4/3mm by mid-to-late October; boots and a hood become worth packing from November, especially further north.
Where it wakes up first
Not every spot benefits equally. Sheltered summer beginner beaches like Baleal and Foz do Lizandro stay fun, but the standouts are the swell-hungry reefs and points: Ericeira's Coxos and Ribeira d'Ilhas come alive, Peniche's Supertubos starts loading into the barrel it's known for, the Costa Vicentina (Arrifana, Amoreira) picks up more exposure, and the north (Porto, Matosinhos, Viana) gets consistent NW groundswell with far fewer people than the Lisbon coast.
Crowds thin out, but not all at once
September is still busy: summer holidaymakers overlap with the surf-tourism peak, and Portugal's biggest events cluster in the first half of the month. From mid-October, European schools are back in session and crowds drop sharply even as the surf keeps improving: arguably the best swell-to-crowd ratio of the year sits in late October and November, before the season's biggest winter swells bring the specialist Nazaré crowd back.
Adjusting your kit and your booking
Shift from soft-tops and fun shapes toward a shortboard or fish as the power picks up. If you're renting, ask whoever you're renting from what's actually firing that week rather than locking in a board days ahead: conditions swing fast during this transition, and plenty of shops keep more than one shape in their quiver for exactly that reason.
Frequently asked questions
When does the water get cold in Portugal?
Gradually. Water holds around 20–22°C through August, drops to about 19–20°C in September, 17–18°C in October and 15–16°C by November. The north (Porto, Viana) runs 1–2°C cooler than the Algarve at the same time of year, so pack a slightly thicker wetsuit if you're heading north.
Is September a good month to surf in Portugal?
Yes, and it's often the sweet spot: water is still close to summer temperature, the season's first real groundswells start arriving, and Portugal's biggest surf events cluster in the first half of the month. The trade-off is that crowds and the nortada wind haven't fully let go yet; both ease more from mid-October.
What wetsuit do I need in Portugal in October?
A 4/3mm steamer covers most of October comfortably. A 3/2mm still works on warm early-October days if you don't mind a chill toward the end of a session. Boots become worth packing by late October, especially north of Lisbon.
Does the swell get bigger in autumn?
Yes, from September the North Atlantic storm track reactivates, sending longer-period, more organized groundswell than summer's smaller windswell. Reef and point breaks that need size to work properly, like Coxos or Supertubos, go from average to genuinely good.
Is Portugal less crowded in autumn?
Noticeably, from mid-October onward: European schools are back in session and the summer surf-tourism peak has passed, even as conditions keep improving.