In August the sea is warmest around Mallorca (28 °C), Cyprus (28 °C) and Ibiza (28 °C). Average daytime highs across the 30 islands below range from 25 °C to 33 °C; the warmest days are on Cyprus (33 °C). Every island on the list has beach weather this month. Hiking conditions (15–25 °C by day, little rain) are best on El Hierro. Driest: Lanzarote with about 0 rain days.
| Island | Sea | Day | Night | Rain days | Good for |
|---|---|---|---|---|---|
| Mallorca | 28° | 32° | 23° | 4 | Swim |
| Cyprus | 28° | 33° | 24° | 0 | Swim |
| Ibiza | 28° | 31° | 24° | 2 | Swim |
| Formentera | 28° | 31° | 24° | 3 | Swim |
| Crete | 28° | 31° | 23° | 1 | Swim |
| Ischia | 27° | 30° | 24° | 3 | Swim |
| Capri | 27° | 30° | 23° | 7 | Swim |
| Menorca | 27° | 29° | 24° | 3 | Swim |
| Malta | 27° | 31° | 25° | 1 | Swim |
| Comino | 27° | 30° | 24° | 1 | Swim |
| Gozo | 27° | 31° | 25° | 1 | Swim |
| Ithaca | 27° | 30° | 23° | 3 | Swim |
| Corfu | 27° | 31° | 24° | 3 | Swim |
| Île Sainte-Marguerite (also Île Saint-Honorat) | 27° | 30° | 21° | 3 | Swim |
| Santorini | 26° | 28° | 23° | 1 | Swim |
| Île du Levant | 26° | 30° | 21° | 2 | Swim |
| Lavezzi Islands (also Cavallo, Île de Piana) | 26° | 30° | 23° | 2 | Swim |
| Port-Cros | 26° | 30° | 21° | 2 | Swim |
| Porquerolles | 25° | 31° | 21° | 3 | Swim |
| Île du Gaou | 24° | 29° | 21° | 3 | Swim |
| El Hierro | 24° | 25° | 18° | 1 | SwimHike |
| Île des Embiez | 24° | 29° | 21° | 3 | Swim |
| La Palma | 24° | 30° | 22° | 1 | Swim |
| Gran Canaria | 24° | 31° | 24° | 0 | Swim |
| La Gomera | 24° | 29° | 22° | 1 | Swim |
| Tenerife | 24° | 27° | 21° | 0 | Swim |
| Pomègues (also Frioul Islands, Ratonneau) | 24° | 28° | 20° | 2 | Swim |
| Lanzarote | 24° | 29° | 21° | 0 | Swim |
| Fuerteventura | 23° | 27° | 21° | 0 | Swim |
| La Graciosa | 22° | 26° | 21° | 0 | Swim |
Sources: ERA5 reanalysis via Open-Meteo (air temperature, rain; 10-year average) and Open-Meteo Marine API (sea surface temperature; 3-year average). Data by Open-Meteo.com (CC BY 4.0). Area averages — individual years vary.
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All islands, all months: sea temperature at a glance