The weather in Portugal in September

As the summer months gradually bid farewell, September arrives in Portugal like a gentle transition, offering a delightful blend of warm sunshine, cooler breezes, and a hint of fall charm. Here is our guide to the weather in Portugal in September. 

The weather in Portugal in September at a glance

• In September, the weather in Portugal is usually pretty mild, with temperatures ranging from 68°F to 82°F (20°C to 28°C). It’s great for outdoor activities without the summer heat.
• The crowds start to thin out compared to the summer months, but Lisbon and Porto can still be busy.
• September is the beginning of the grape harvest season, so it’s a great time to visit vineyards for tours and tastings. Many places do special harvest-related events, too.

What is the weather like in Portugal in September?

September is a nice time to be in Portugal. The intense heat of summer starts to ease up, but you’ll still get plenty of sunny days and warm afternoons. Evenings are generally mild, so you won’t need to pack too many layers.
Rain is pretty minimal this time of year, though you might get the odd shower. For the most part, it’s dry and clear enough that you can spend your days outside without constantly checking the forecast.

Average temperatures in September

September in Portugal is still warm, but not as intense as the peak summer months. You’ll usually see daytime temperatures between 68°F and 81°F (20°C to 27°C), while nights cool down to 55°F to 70°F (13°C to 21°C).

Rain starts to become a bit more common compared to July and August, but it's usually light and doesn't last long. Sea temperatures hover around 70°F (21°C), so the water’s still comfortable for swimming, especially in the south and on the islands. During the day, expect mostly sunny skies with enough warmth for the beach or walking around town. 

Porto and northern Portugal

In the north, including Porto, the weather is a bit milder and more changeable than down south. Daytime temperatures usually reach between 68°F and 77°F (20°C to 25°C), and evenings often drop to around 55°F (13°C). Rain starts to pick up here in September, with around 2 to 3 inches (50–70mm) expected over the month, but it’s still a good time for exploring the city or nearby wine country. The Atlantic up here is cooler too, usually around 66°F (19°C), so swimming is possible but a bit brisk unless you’re used to colder water. See our guide to how many days you need in Porto. 

Lisbon and central Portugal

Lisbon and central Portugal stay pretty warm in September. During the day, it’s usually between 72°F and 81°F (22°C to 27°C), and evenings are comfortable at around 59°F to 66°F (15°C to 19°C). Rain is still fairly light—about 1.5 to 2.5 inches (40–60mm) throughout the month. The sea here is around 68°F (20°C), which can be refreshing after a hot afternoon. It’s a good month to be outside: you can still catch beach weather, but it’s also comfortable enough for city exploring or heading inland. The city stays active well into the evening and it's a great time for a Lisbon city break.

The Algarve and southern Portugal

Southern Portugal, including the Algarve, stays warm well into September. Daytime temperatures often hit 75°F to 84°F (24°C to 29°C), and nights don’t cool off too much—expect around 63°F to 70°F (17°C to 21°C). Rain is minimal this time of year, averaging just 0.8 to 1.6 inches (20–40mm). It’s a popular time to go for a swim, with sea temperatures around 70°F (21°C), and beaches still feel summery without the midsummer crowds. This part of the country tends to hold onto the heat a little longer than the rest.

Madeira

Madeira stays mild and consistent in September. Daytime highs usually sit between 73°F and 81°F (23°C to 27°C), and nighttime temperatures stay comfortable at around 64°F to 70°F (18°C to 21°C). Rain is light—just 0.4 to 0.8 inches (10–20 mm)—so most days are dry with a mix of sun and cloud. The sea is warmer here than on the mainland, sitting at around 73°F (23°C), and it’s a good time for swimming, snorkeling, or boat trips.

Is September a good time to visit Portugal?

September is a great time to be in Portugal if you’re looking for warm weather without the intensity of the summer heat. It’s still sunny and dry in most parts of the country, but things start to cool off a little—especially in the evenings. The beaches are still pleasant, and the sea stays warm enough for swimming. You’ll also see fewer crowds than in July and August.

In wine regions (like the Douro Valley), September is harvest season. It’s a nice time to visit vineyards or to join a tasting. The weather is also good for getting outdoors—walking, cycling, or sitting outside at a café without sweating through your shirt.

What about crowds and costs?

September falls between peak and low seasons, so you’ll still see a fair number of tourists—especially in Lisbon and Porto—but it’s generally calmer than midsummer. Beaches, museums, and big sights are still busy, just not quite as packed. If you head inland or stick to smaller towns, you’ll notice things quiet down even more.

Prices also start to dip after August. Flights and hotels are usually a bit more reasonable, especially toward the second half of the month. You might not get low-season deals yet, but it’s a more budget-friendly time than high summer. If you're after similar weather with fewer people, April or early May can also be a good time for you—just keep in mind that the sea is cooler in spring.

Where to go in Portugal in September

September is a good time to see Portugal without the stress of peak season. The days are warm, the sea is still good for swimming, and things start to quiet down a bit. Here are some of our picks for places to go in September. For more places to check out, see our guide to the best places to visit in Portugal.

Algarve

The Algarve starts to feel more relaxed this time of year. You’ll still get warm days, and the water’s comfortable if you’re up for a swim. The popular beaches and coves are a lot less crowded than they were in August, so it’s easier to find a quiet spot or go for a walk along the cliffs without weaving through groups of people. Boat trips to the sea caves still run and are often easier to book last minute. Restaurants and stores stay open, but the pace shifts—it starts to feel more like daily life again, especially in the smaller fishing towns.

Douro Valley

This is when grape harvest gets going in the Douro Valley, so there’s a lot happening in the vineyards. The hills turn a mix of gold and green, and some of the wine estates open up for people to see the process or even take part. You might come across grape-picking or traditional foot-stomping still being done the old way. River cruises are a calm way to take in the landscape, and the light in the valley is especially nice in the late afternoon. 

Porto

By September, Porto has started to quiet down a bit. The weather’s still nice, and it’s easier to walk around the old town or along the river without the summer rush. The city still has energy, though, especially with events like the Festival Internacional de Marionetas, which brings puppetry performances to streets and venues across the city. Seafood is in season, and outdoor dining usually goes strong through the month.

What to do in Portugal in September

Portugal in September feels like everything’s just a bit easier (including getting around Portugal ). The crowds from summer have thinned out, but the weather’s still warm enough for swimming and day trips. It’s also when a lot of local festivals start popping up—some connected to the wine harvest, others rooted in older folk traditions. 

Feiras Novas

If you’re anywhere near the north in September, Ponte de Lima’s Feiras Novas is worth making time for. It’s one of Portugal’s oldest festivals, but it doesn’t feel overly polished or touristy. The whole town turns into a celebration—parades, traditional music, dance groups, and a lot of people in folk costumes. There are giant puppet figures called gigantones that march through the streets, plus market stalls with food and handmade goods. It’s loud, it’s busy, and it’s very local. This is a great thing to do when on a trip to Portugal with kids.

Wine festivals

September is when the wine harvest happens, so you’ll find events all over the country tied to it. In Porto, the Porto Wine Fest is an easy one to check out—it’s right along the river, with tastings and guided tours that focus on the region’s port wine. 

Madeira also has its own wine festival, which includes cultural performances and the traditional grape stomping—people literally get in barefoot and crush grapes, usually in full costume. It’s festive but also rooted in real tradition. If you’re in the Douro Valley, some of the smaller vineyards host their own harvest celebrations. They tend to be more intimate, and you might get the chance to join in—pick grapes, try some wine, and talk to the winemakers. 

Caramulo Motorfestival

This one’s a bit off the typical tourist trail, but if you’re into cars or just want something different, the Caramulo Motorfestival makes for a fun day trip. It takes place in the Serra do Caramulo, a mountain area in central Portugal, and mixes car culture with a scenic setting. There’s a vintage hill climb event where old cars race up the mountain roads, plus displays of classic cars, motorcycles, and even art related to auto history. 

Even if you’re not a huge car person, it’s a cool mix of old-school engineering, local food, and mountain views. It feels more like a gathering than a commercial event, which makes it stand out.  For more ideas, see our guide to undiscovered Portugal off the tourist trail.
 

Plan your trip to Portugal in September

If you're ready to take a trip this fall, here are a few Portugal travel tips to help:

What to pack

You’ll still want mostly summer clothes, but it’s worth bringing a few layers for evenings, especially up north. The ocean is warmest this time of year, so swimwear is still useful. If you're heading to northern coastal towns like Viana do Castelo, a light jacket is a good idea. Walking gets easier as the temperatures drop a little, so bring comfortable shoes for longer outings. If you’re heading to the mountains or places in the north, pack a light rain layer just in case. If you're checking out wine regions like the Douro or Dão during harvest season, darker, casual clothes are better for vineyard visits. A daypack can be useful

Planning your itinerary

If you’re visiting Portugal in September, it’s a good idea to look over some sample Portugal itineraries to inspire your travels:

• 5-day Portugal itinerary: Spend 2 days in Lisbon, exploring Alfama, Belém, and Baixa. Then head to Porto for 3 days, checking out Ribeira, wine cellars, and taking a scenic Douro River cruise.
• 7-day Portugal itinerary: A route that starts in Foz do Minho and moves on to Nazaré, Caparica, Galapos, Comporta, and the Algarve beaches.
• 10-day Portugal itinerary: Cover Lagos, Évora, Elvas, Lisbon, Coimbra, Serra da Estrela, Porto, and Peneda-Gerês National Park in 10 days.

When to book

September is honestly one of the best times to go. The first week still feels a lot like summer peak, but things drop off after that.  Try to book your accommodations 2–3 months in advance if you’re coming early in the month; later on, you’ll have more flexibility. Restaurant reservations are helpful but not totally essential—unless it’s a super popular spot. And if you’re up for something different, rural farm stays can be great this time of year. Wine regions are especially nice in September—harvest season starts, and some places let you take part if you book ahead 3-6 months in advance.

Emergency weather information

In September, the weather can start to shift. You might get the first fall rains and, occasionally, flash floods in cities like Lisbon and Porto. A lightweight waterproof jacket and shoes with good grip are useful, especially in older neighborhoods with stone streets. You can keep an eye on forecasts through IPMA or local news channels like SIC Notícias. If something unexpected happens, call 112 or the Civil Protection Authority at 214 247 100. Public spaces like metro stations and shopping centers often serve as temporary shelters if there’s heavy rain.

For your ultimate Portugal trip, check out our guide on how to plan a trip to Portugal, with all the essentials and recommendations, or explore more in our Portugal travel guide and unique Portugal trips.