Most pilots who visit Portugal in summer leave saying the same thing: "I should come back in autumn." The nortada that dominates coastal flying from June to August gradually weakens in September, and by October something remarkable happens — the thermal season that was suppressed all summer by the Atlantic wind wakes up across the entire country. The Alentejo plain, the Arrábida range, the foothills behind Sesimbra: all of it comes alive with the kind of convective flying that makes for first proper XC distances.
What Changes in September
September is a transition month. The nortada still blows in the first two to three weeks — coastal soaring at Sesimbra and Cabo Espichel remains excellent — but its grip loosens. By mid-September, the days between nortada cycles are longer, and the south-west flows that come in behind Atlantic systems begin generating thermals rather than suppressing them.
Temperature is still high — 22–26°C at sea level, often higher inland — and the sun angle is lower, which means slower, more readable thermals rather than the explosive convection of midsummer. September is arguably the best month to be a mid-level pilot trying to understand thermalling: the lift is active enough to be useful, gentle enough to be readable.
Weeks 1–2: Still nortada-dominant. Coastal soaring at Sesimbra and Cabo Espichel, with brief thermal windows inland when the wind drops. Weeks 3–4: The transition. Mixed conditions — some coastal days, some thermal days, some days that start coastal and convert to thermic. Best of both worlds.
Why October Is the Favourite Month
For experienced pilots — particularly those focused on XC coaching and building cross-country distance — October is the month to book. The statistics are unambiguous: October has the highest proportion of strong thermal days of any month in the Portuguese flying calendar.
The reasons are meteorological. The Alentejo plain has been baking since May and retains enormous ground-level heat. Atlantic fronts bring instability but also flush out the marine layer that dampens summer thermals. The result is thermals that trigger early (09:00–10:00 local), top out at 1,500–2,500 m, and run until 16:30 before the inversion settles. For pilots used to Alpine XC where windows are short, the duration of Portuguese October thermals is striking.
XC Flying Into the Alentejo
The Alentejo plain becomes the destination for autumn XC weeks. The terrain is flat and forgiving — cork oak forests, stubble fields, olive groves, the occasional reservoir — with abundant landing options and long retrieves by road. The flying is all about thermal navigation and XC decision-making, with none of the technical ridge management that coastal flying demands.
A typical autumn XC day from Sesimbra involves launching from the ridgeline by 10:00, hitting the first thermal within 5 minutes, and pressing south-east toward the Alentejo where the ground heats fastest. From there it is a matter of following the thermals: read the trigger, centre the core, climb to base, glide. On good days, pilots cover 60–90 km before beginning the long retrieve.
For pilots who have been working on their cross-country paragliding skills but have struggled to find the conditions to really test them, the Alentejo in October is one of the best training grounds in southern Europe. The sky is big, the thermals are honest, and there is no terrain to make mistakes expensive.
Coastal Flying in Autumn
The coast does not switch off in autumn. Between thermal days, south-westerly flows provide excellent soaring at Cabo Espichel — often stronger and more consistent than the summer nortada. The Arrábida range opens up for full-day thermal flights that are simply not possible in summer when the sea breeze shuts the thermals down at midday.
Autumn evenings at the coastal sites have a particular quality: the light is warm and horizontal, the Atlantic turns deep gold, and the thermals flatten into gentle evening lift that allows long, relaxed soaring without the intensity of the midday thermal cycle. These are the sessions that pilots remember most vividly about an autumn week.
Practical Advantages of Autumn
- Accommodation — 30–50% cheaper than July and August, more availability, no need to book 3 months ahead
- Crowds — Sesimbra in October has a fraction of its summer tourist population; the harbour restaurants have space, the village feels like itself again
- Prices — flights from northern Europe are cheaper; hire cars are plentiful
- Temperature — 22–26°C feels more comfortable than August's 32°C for pilots carrying heavy gliders up hillsides
- Retrieve — roads are quiet, retrieve drivers can move quickly, XC days flow smoothly
The Honest Caveat — Atlantic Fronts
Autumn is also when the first frontal systems of the season begin arriving from the Atlantic. A strong low tracking across the Bay of Biscay can bring 2–3 days of rain and strong winds to the peninsula. The complete seasonal guide covers this in detail, but the short version is this: a 7-day week in October will typically have 4–5 excellent flying days, 1 weather-watching day, and possibly 1 day where nothing flies. That ratio compares favourably to most northern European autumn destinations, and it explains why the autumn weeks fill first each year.
To book an autumn week, message Behrooz on WhatsApp. September and October fill up by June, so earlier is better.