Gran Canaria is the third largest of the Canary Islands and famous for being a 'continent in miniature' — a roughly circular island whose centre rises to 1,950 metres, creating distinctly different climates within an hour's drive. The dunes of Maspalomas in the south are an iconic Sahara-like landscape; the lush green ravines of the north are a different country. The climate is among Europe's most reliable year-round.
Year-round destination. November-April is peak European winter-sun season; May-October stays warm but less crowded. The south is reliably sunny year-round; the north can be cloudy.
December through February brings 21-22°C in the south, sunny and dry, with sea at 19-20°C. The north is cooler and cloudier — closer to 19°C. This is peak winter-escape season for Northern Europeans; Maspalomas and Playa del Inglés fill up. Las Palmas (the capital, in the north) sees more rain but stays mild.
March through May warms gradually to 22-24°C. The interior wildflowers peak. The calima (Saharan dust wind) can briefly push temperatures into the thirties for a few days a year. Sea climbs to 19-20°C — still cool by Mediterranean standards.
June through August reaches 26-28°C in the south with reliable trade winds keeping it comfortable. Sea peaks at 23°C in late summer. The north remains cooler and breezier. This is Spanish family-holiday season.
September and October stay warm (25-26°C) and arguably offer the best beach weather of the year — water at peak temperature and crowds easing. November sees the first autumn fronts in the north but the south stays dry and around 23°C.
Tenerife is bigger, has Teide (Spain's highest mountain), and a stronger north-south contrast. Gran Canaria has the Maspalomas dunes, an excellent capital city beach, and is geographically more compact. Both work as year-round winter-sun destinations.
Maspalomas and Playa del Inglés are heavily developed and unapologetically resort-focused. If that puts you off, base in Mogán, Meloneras, or in Las Palmas for character and authenticity.
Sea temperatures of 19-20°C in winter feel cool to most Northern Europeans but bearable for short swims. Many resorts have heated pools. The water warms to 22-23°C by August-October.
Five to seven days for a beach plus a couple of interior excursions. Two weeks lets you slow down, do multiple hikes in the centre, and split between south and capital.