IslaBuWhat is calima and how long does it last?
Calima is Saharan dust carried to the Canary Islands by wind from Africa. The sky turns yellow or grey, visibility drops and it often gets warmer. It usually lasts a few days.
When calima arrives
Calima forms when wind from the east to south-east lifts dust over the Sahara and carries it over the islands. It is most common in winter and early spring, but it can come in any month. In summer it is often accompanied by intense heat and very dry air. An episode usually lasts a few days and ends when the trade winds from the north-east return.
Is calima dangerous?
For a healthy person, light calima is mainly unpleasant. But the fine dust particles irritate the airways and the eyes. During stronger calima, people with asthma, people with heart and lung conditions, older people and small children should limit time outdoors, and physical exertion in particular, keep windows closed and drink enough. During strong calima the authorities issue warnings, and air traffic may also be restricted.
Can you swim during calima?
Calima does not change the sea itself, so you can swim. But expect heat, poorer visibility and views from the mountains and viewpoints that will not be worth the trip. It is better to postpone hikes and outdoor sport.
How do I know calima is coming?
IslaBu shows calima for each island for today and tomorrow, based on the dust forecast from the Copernicus service (CAMS) and on official AEMET warnings. When a warning has been issued, it always takes priority over our estimate.
Sources: AEMET – Agencia Estatal de Meteorología · Copernicus Atmosphere Monitoring Service · Gobierno de Canarias · Updated October 4, 2026