Costa del Sol Sea Temperature by Month (2026) — When Is It Warm Enough to Swim?

Costa del Sol Sea Temperature by Month

The Costa del Sol's nickname oversells one thing and undersells another: there's sun almost year-round, but the sea takes its time to warm up. The Mediterranean here runs from a chilly 15°C in late winter to a bath-like 24°C at the peak of August, and the gap between "technically the beach" and "actually want to get in the water" is bigger than most visitors expect.

These are the monthly averages for the Málaga–Marbella stretch. The whole coast sits within about a degree of each other, so the figures hold from Estepona in the west to Nerja in the east. Use them to plan: the air is warm enough to sunbathe from April, but the sea isn't genuinely comfortable for swimming until June, peaks in August, and stays lovely right through to mid-October.

Average sea temperature, month by month

Month	Sea temp	Swim verdict	Verdict
January	16°C / 61°F	Cold — quick dip or a wetsuit	Cold
February	15°C / 59°F	Coldest of the year — wetsuit weather	Cold
March	15°C / 59°F	Still cold — paddlers only	Cold
April	16°C / 61°F	Cool — brave swimmers only	Cold
May	18°C / 64°F	Brisk but swimmable after a few seconds	Brisk
June	21°C / 70°F	Pleasant — comfortable for most	Pleasant
July	23°C / 73°F	Warm — perfect for swimming	Warm
August	24°C / 75°F	Warmest of the year — bath-like	Warm
September	23°C / 73°F	Warm — the local's secret month	Warm
October	21°C / 70°F	Pleasant — still very swimmable	Pleasant
November	18°C / 64°F	Brisk — cooling fast	Brisk
December	16°C / 61°F	Cold — quick dip only	Cold

Climatological averages for the Málaga–Marbella coast. The whole Costa del Sol sits within ~1°C, from Estepona in the west to Nerja in the east.

Sea temperature — frequently asked

When is the sea warmest on the Costa del Sol?+

August, at around 24°C — bath-like and warm enough to stay in for hours. July and September are nearly as warm (around 23°C), and September is the local favourite: the same warm water with far fewer crowds.

Is the sea warm enough to swim in June?+

Yes for most people — June averages around 21°C, comfortable after the first few seconds. May is noticeably brisker at about 18°C, swimmable but bracing. From June onward the water is genuinely pleasant.

Can you swim in the sea in winter on the Costa del Sol?+

It's cold — roughly 15–16°C from December through March, which is wetsuit-or-quick-dip territory. Hardy locals still take a dip, but most people don't. The upside: the sun is often warm enough to sunbathe on the beach even in January.

What's the best month for a beach holiday on the Costa del Sol?+

June and September are the sweet spot: warm sea (21–23°C), reliable sun, and far fewer crowds and lower prices than peak July–August. If you want the warmest possible water and don't mind the crowds, go in August.

Is the sea temperature the same in Marbella, Málaga and Nerja?+

Almost — the entire coast stays within about 1°C. The western beaches (Marbella, Estepona) run marginally warmer; the eastern end around Nerja can feel a touch cooler when the Levante wind pushes deeper water toward the shore.

Why does the sea sometimes feel colder than the average?+

The Levante (easterly) wind can drop the surface temperature a degree or two for a day or so by drawing up cooler water from below. It usually settles within 24–48 hours. Mornings, before the afternoon breeze builds, are the calmest and clearest.

Costa del Sol Sea Temperature by Month

Average sea temperature, month by month

Make the most of your visit

Sea temperature — frequently asked