When to surf: how do you pick the right window (tide, wind, swell)?

1. Wind first: offshore or light

Wind is the first filter, because it determines the quality of the waves whatever their size. An offshore wind (blowing from the land out to sea) holds the wave up, hollows it out and smooths the surface: that's the dream, especially when it stays light. An onshore wind (from the sea toward the land) disorganises everything and makes the waves mushy, closing out early.

• With no offshore, a light wind from any direction is still workable.
• Cross-shore (sideways) is in between: fine if it's light.
• A strong wind almost always ruins the session, even offshore once it gets too powerful.

So look at both the direction and the strength of the wind (in km/h or knots), hour by hour: the wind often changes a lot over the course of the day.

2. The right tide (it depends on the spot)

There's no universal "right tide": every spot has its own. Some work at low tide, others at mid incoming tide, others at high tide. The same place can be perfect at one level and unrideable two hours later: the waves close out, go mushy or stop breaking altogether.

On coasts with a large tidal range like the French Atlantic, the effect is major. Look at the times of high and low water and the day's tidal coefficient (the range), then set your session around the window that suits the spot. Find out about this ideal tide — local knowledge or feedback from other surfers is worth its weight in gold.

3. The morning (and evening) glass-off

Early in the morning, the wind is often at its lightest of the day: the sea is smooth as a mirror — the famous glass-off (a "glassy" sea). These are frequently the best conditions, with fewer people in the water as a bonus. Late in the day can offer a second glass-off when the thermal breeze drops at sunset.

Conversely, in the middle of the day in summer, the sea breeze (the thermal breeze that picks up with the heat) often builds and degrades the waves. In practice: favour the first or last session of the day, especially in fine summer weather.

4. The swell: present, long-period and well-oriented

No swell, no wave. Check that there's some size, but above all some period (the gap in seconds between waves): a long-period swell (12 s and up) gives more powerful, bigger, more consistent waves at the shore than a short period, which stays choppy.

Also make sure the swell direction suits the spot's orientation: a poorly oriented swell leaves the place small or flat. A decent, long-period, well-oriented swell, with a light wind and the right tide, is the winning combination.

5. Matching the window to your level

The "right window" isn't the same for everyone. A beginner looks for small, clean conditions; an experienced surfer can aim for a bigger swell and a more technical tide.

• Beginner: small swell (0.5 to 1 m), light wind, a tide where the waves break gently, a lifeguarded beach, few people.
• Intermediate: well-oriented swell of medium to long period, light offshore wind, the spot's ideal tide.
• Experienced: can make use of bigger swells and stronger winds, knowing the currents and their own limits.

In all cases, if the conditions exceed your level (sea too big, strong current), the right window is the one where you stay safe: calling it off is an experienced surfer's decision.

6. The right instinct before heading out

Cross-check the four parameters — wind, tide, swell, period — rather than looking at a single number. Aim for a window where the wind is light or offshore AND the tide matches the spot AND the swell is present and well-oriented. The morning often ticks several boxes at once.

BeachFinder shows the spot's swell, period, wind and tide, rated by the community, so you can spot the day's window and compare the forecast with the real feel on the beach.