Portugal's been enjoying a second summer this month, but the plug is getting pulled this weekend. Forecasters expect a cooler, breezier couple of days from Saturday 17 October, with the biggest temperature drops in the north and central interior.
Saturday is the gentler half of the weekend. Light showers are possible in the North and Centre regions, mostly in the morning, but plenty of places will stay dry. Sunday is when the change really lands: Meteored has Guarda peaking at just 16°C and Bragança at 17°C, while Porto, Braga, Aveiro and Coimbra should manage around 22°C. The coast-to-interior contrast is stark — a jumper-and-jacket day up in the Serra da Estrela area, mild and walkable in the cities.
Lisbon hangs onto more of the warmth, with highs near 26°C on Sunday, and the Algarve and Alentejo should sit between 22°C and 24°C — still outdoor-lunch territory if the clouds behave. That said, independent forecaster Luso Meteo flags a chance of isolated showers and thunderstorms on Sunday afternoon in the Algarve and Baixo Alentejo, so don't book that terrace table too far from an awning.
Wind picks up on Sunday too, especially on higher ground. And there's one genuinely practical warning: the combination of dry air and easterly winds keeps the fire risk high, even as temperatures fall. If you're planning countryside walks or rural stays in the interior or the hills of the Algarve, it's worth checking local conditions and respecting any restrictions on trails or barbecues.
If you're already in Portugal, this isn't a weekend to cancel anything — it's just a reminder that October here is a month of two halves. Mornings can feel autumnal, afteroons can feel like September. Pack layers, keep a light rain shell handy, and lean towards the southern coast if sunshine is non-negotiable. The Algarve at 23°C in mid-October is still a better beach bet than most of Europe manages in August crowds-free.
For anyone considering a shoulder-season trip, this is exactly the kind of variability that makes October attractive: warm enough for the coast, cool enough for city sightseeing, and accommodation prices well below summer. Just time your plans around the forecast — Sunday looks like the day for indoor museums, a long lunch, or a coastal drive with the windows up.
