Best time to visit Lisbon: March–May & September–October.
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March–May & September–October is the best window to visit Lisbon. Warm and sunny without the peak heat and crowds of midsummer.
July–August is the stretch to avoid if possible. Peak heat and the highest crowds and prices of the year.
Not necessarily — weather and crowd timing don't always match the cheapest airfare windows. Check our Best Time to Book Flights tool separately for pricing.
Usually yes — the weeks just before or after Lisbon's best window often have nearly as good weather with noticeably fewer crowds and lower prices.