Onshore, Offshore & Sideshore

A forecast says "NE, 18 knots" — and that sentence means nothing until you put a beach under it. The wind that arrives straight off the sea at one bay wraps a headland and leaves the land at the next one. So wind sports never ask "which compass direction?" first; they ask "which way relative to MY beach?", and the answer always lands in one of five classes.

One convention before the five: wind is named by the direction it comes from. Wind is always named by the direction it comes FROM. A "NE wind" or "45°" blows out of the northeast, toward the southwest — meteorology, marine forecasts and every kite forecast app agree on this.

Every angle between wind and beach folds into this table. The columns are the five sports this page speaks for — notice the surf column disagreeing with everyone as the wind turns offshore. No error there: surfers really do want the wind kiters avoid.

Wind blowing straight from the sea onto the beach, within about 22° of head-on. Everything in the water gets pushed back toward land. Also called: full onshore, sea breeze straight in — German "auflandig", Brazilian "vento maral".

Everything drifts back to the sand — safe, but the beach never leaves your back. — Safe drift — but the wind pins you to the beach. You need working upwind technique to get out, and the shore is always at your back.

Wind coming in at an angle, roughly 22–67° off straight-in — diagonally from the sea. The classic teaching wind: it lets you ride away from the beach and still washes you back if things go wrong. Also called: cross-onshore — German "schräg auflandig", Brazilian "maral de lado".

Out at an angle, back with the wind — the direction schools pick on purpose. — The school wind. Sea-breeze flow is smooth, launching away from the beach is easy, and a dropped kite still drifts you home.

Wind blowing parallel to the beach, roughly 67–112° off straight-in. Ride out on one tack, back on the other — the coast becomes a lane. Also called: cross-shore, side — Brazilian "vento lateral", German "sideshore" too.

The coast turns into a training lane — out one way, home the other. — Out and back without fighting for angle. Know your downwind exit: a long lull drifts you along the coast, not onto it.

Wind leaving the land at an angle, roughly 112–157° off straight-in. It feels almost like sideshore — until a lull shows you which way the drift really points: out. Also called: cross-offshore — German "schräg ablandig", Brazilian "terral de lado".

Feels like sideshore, drifts like offshore — the trap direction. — One lull or one relaunch that won't come, and you're drifting out. Land wind is gusty on top of it. Rescue cover or don't.

Wind blowing from the land out to sea, within about 22° of straight out. Near the beach it often looks deceptively calm and glassy — the land blocks the chop while the wind carries everything away from shore. Also called: land breeze straight out — German "ablandig", Brazilian "vento terral".

Two physics stack against you. Air that crossed land arrives gusty and turbulent, because buildings, dunes and trees chew it up before it reaches the water. And the drift only knows one direction: out. A dropped kite, a failed relaunch or plain exhaustion becomes distance from the beach — and a self-rescue only travels downwind, which offshore means further away. Kite schools put it plainly: offshore spots are boat-cover spots, or they are no-ride days.

Kitesurfing and wing foiling share a verdict sheet: side-onshore to sideshore is the playground, full onshore is safe but athletic, and anything offshore-leaning is rescue-cover territory — a kite or wing that stops flying is a drift raft.

Windsurfers read the same table with one nuance: a rigged windsurfer points higher upwind than a kite, which helps exactly as long as nothing breaks. The drift physics after a breakage are identical, so the offshore verdict stays the same.

Surfers invert the whole table. Offshore wind presses against the incoming waves, grooming faces glassy and holding lips open longer — the postcard conditions. Onshore crumbles them into mush. The one caveat surfers carry: the wind that grooms the wave also pulls a loose board and a tired paddler seaward. Same physics, opposite priorities.

SUP gets the strictest sheet of all, straight from rescue organizations: paddle craft should avoid offshore winds entirely — a standing paddler is a sail, and the drift outruns most arms.

Careful with map arrows: most forecast maps draw the arrow pointing where the air travels TO — the opposite end from the wind's name. The degree circle runs clockwise from north:

Then convert to your beach. That is the whole trick of this page. Three worked examples: a beach facing south with a SE forecast gets side-onshore from the left (the school wind). A beach facing north with a SW forecast gets side-offshore from the left — 225 and 0 look far apart on paper, but the true angle is 135°. And a Ceará beach facing northwest under the ENE trade gets sideshore from the right, two degrees shy of side-offshore. Cases like that are why the Beach Check exists. Wind speed has its own tool: the wind speed converter.

Some winds are famous enough to carry names — and every one of them proves the same point: the name tells you origin and character, but the beach decides the class.

Direction is one axis of wind literacy. The others live in our glossary and tools: gusts and lulls, thermal winds that build with the afternoon, and the rider-relative geometry of the wind window — which begins where this page ends, the moment your kite is in the air.

Every class and every verdict on this page is backed by at least two of the published guides below — kite schools, surf publications, forecast providers and paddling safety organizations. Where a sport-specific source was missing, the verdict was downgraded to the stricter general guidance, never upgraded.