What is calima (Saharan dust) and why it matters for your boat

If you've ever flown into Alicante and noticed the sky is orange-brown rather than blue, you've seen calima. It's a southerly weather pattern that lifts fine dust off the Sahara and dumps it across the western Mediterranean — including the Costa Blanca, two or three times a year on average, and more often in a bad year.

For boats sitting in the marina, it's not just a cosmetic problem.

What calima actually does to a yacht

The dust is fine — much finer than beach sand — and it gets everywhere:

• Settles on decks, sails, and inside any locker that isn't fully sealed
• Mixes with morning dew to form a red film that stains gelcoat, teak and white canvas if left
• Works into stainless fittings, blocks and tracks where it acts as a mild abrasive
• Coats sprayhood and bimini panels, dulling them and accelerating UV damage

If a calima event hits during a long owner absence and the next rain washes it across the decks before anyone wipes it down, the staining can be permanent.

When it usually happens

The worst events tend to cluster in late winter and early spring (February to April) and again in late summer (August to October), but they can happen any time the wind sets up from the south or southwest for more than a day or two. Spanish weather services and apps like Windy will show it coming a couple of days out.

What to do about it

Before: if you know one is coming, close hatches, drop and bag canvas if practical, and accept that you'll be cleaning the boat soon.

During: don't bother washing — it's still falling.

After: a proper fresh-water rinse, top down. Don't just hose the decks; the dust is on rigging, in tracks, on the mast. A wipe-down of stainless and a soft brush over teak finishes the job. Left longer than a week, especially if it rains, the staining sets in.

The absentee owner problem

If your boat is in Torrevieja, Alicante or Santa Pola and you only fly out every six weeks, you'll likely arrive to a boat that's been through one or two calimas with no one to deal with them. That's the single most common reason owners we talk to first ask about regular checks — they're tired of arriving to a boat that needs half a day of cleaning before they can use it.

A 10-minute rinse a day or two after each calima event keeps the boat presentable and the gelcoat happy. It's a small thing, done often.

If you'd like someone local to take care of post-calima rinses between your visits, we can help.