Portugal’s year-round mild climate makes it appealing at any time, yet spring (March–May) and fall (September–November) typically offer the best balance of moderate temperatures and fewer visitors. During these periods, Lisbon’s hills are more comfortable to climb, and the Algarve’s beaches are less crowded. July and August mark high season, especially in coastal resorts like Albufeira, and temperatures can soar inland. However, surfers find consistent waves off Ericeira and Peniche most of the year. Winter (December–February) remains relatively mild, especially in the south, but can be wetter. The Douro Valley, known for vineyards turning golden in autumn, draws travelers in late September for wine harvest season. Overall, aim for April–June or September–October if you prefer sightseeing in pleasant weather without the summer rush.
January: Cool, wet in the north; quieter in Lisbon and Porto.
February: Mild in southern Algarve, carnival events in certain towns.
March: Early spring, blossoming countryside, moderate tourism.
April: Pleasant temps, Easter celebrations, good for city breaks.
May: Warmer days, prime for coastal exploration, fewer crowds.
June: Festival season (Lisbon’s Santos Populares), sunny and lively.
July: Hot, busy beaches, vibrant nightlife across coastal resorts.
August: Peak summer, high tourist influx, festive beach atmosphere.
September: Warm seas, fewer visitors, ideal for Douro Valley harvest.
October: Pleasant weather, scenic autumn vineyards, calmer cityscapes.
November: Rainy spells, quieter tourism, mild in south.
December: Festive lights, Christmas markets, cool but not extreme cold.