Europe's most famous southern coast earns the reputation honestly: long dry summers, gentle winters and a sea that warms slowly and cools slowly around them. Treat the numbers below as honest seasonal patterns, not forecasts.
Spring — March, April, May
Daytime climbs from around 17°C in March to the mid-20s by May, mostly under blue skies. Rain becomes rare by late April. The Atlantic is still cool (15–18°C), so spring rewards hikers and sightseers more than swimmers.
Summer — June, July, August
June opens the beach season with highs near 26–28°C; July and August settle around 28–30°C, cooled almost daily by the nortada sea breeze. Rain is exceptional. Sea temperature rises from about 19°C in June towards 21–22°C by late August.
Autumn — September, October, November
September is the connoisseur's month: sea at its warmest, air soft in the mid-20s. October stays beach-viable most years; November brings the first meaningful rains and greener hills.
Winter — December, January, February
Days typically run 15–17°C with bright spells between showers; nights can dip towards 8–10°C. The ocean drops to 15–16°C, though hardy swimmers persist. Golfers, birdwatchers and long-distance walkers claim the season.
One microclimate note
The southwest corner around Sagres is windier and a degree or two cooler than the sheltered central coast; the eastern lagoons around Tavira are the warmest and calmest. Pack accordingly.
