Offshore vs Onshore Wind: What Wind Is Best for Surfing?
Quick answer
The best wind for surfing is light offshore (blowing from land out to sea) or no wind at all, which gives glassy conditions. Onshore wind blows from the sea toward land and roughs up the waves; above roughly 10 knots (19 km/h, 12 mph) it usually makes surf choppy. Cross-shore wind sits in between.
In this guide
Offshore wind blows from the land out to sea, smoothing the wave face and holding waves up so they peel cleanly. Onshore wind blows from the sea toward land, crumbling waves and adding chop. The best surf usually comes with light offshore wind or no wind at all (glassy), while onshore wind above roughly 10 knots (19 km/h, 12 mph) tends to make conditions messy.
The four wind conditions
Offshore
Offshore wind blows into the face of an approaching wave. It slows the top of the wave, so the wave stays steeper and breaks later and more cleanly. The surface stays smooth, and on good days you’ll see spray blowing off the back of the waves. Light offshore is what most surfers hope for.
Cross-shore
Cross-shore wind blows parallel to the beach, from left to right or right to left. It adds some texture and can make one direction of wave better than the other. Light cross-shore is often perfectly surfable; strong cross-shore makes things bumpy and can create a current that drifts you down the beach.
Onshore
Onshore wind blows from the sea toward the beach. It pushes the top of the wave over early, so waves crumble and close out rather than peel. It also adds chop on the surface, which makes paddling, reading the lineup and riding harder. Light onshore is still rideable, especially on a bigger board; strong onshore is often called “blown out.”
Glassy
Glassy means little or no wind. The surface is smooth and reflective, and every wave keeps its natural shape. Glassy conditions are common around dawn and sometimes at dusk.
Wind speed thresholds
Direction is only half the story. Here’s a rough guide to how speed changes things:
| Wind speed | Offshore | Cross-shore | Onshore |
|---|---|---|---|
| 0-5 kn (0-9 km/h, 0-6 mph) | Glassy to clean | Glassy to clean | Glassy to clean |
| 5-10 kn (9-19 km/h, 6-12 mph) | Excellent, groomed | Fine, slight texture | Bumpy but rideable |
| 10-15 kn (19-28 km/h, 12-17 mph) | Still good; harder to drop in | Choppy | Messy, crumbly |
| 15-20 kn (28-37 km/h, 17-23 mph) | Spray, waves held up hard | Rough, strong drift | Blown out |
| 20+ kn (37+ km/h, 23+ mph) | Hard to paddle in; risky | Very rough | Usually not worth it |
These are rules of thumb. A sheltered cove can handle more wind than an exposed beach, and a powerful groundswell holds its shape better in wind than a weak windswell (see swell period explained).
Two practical notes on strong offshore wind: it makes catching waves harder because the wind pushes back as you try to drop in, and if you get separated from your board or tired, it pushes you away from the beach. Be cautious on those days, especially as a beginner.
Daily wind patterns: dawn patrol and the sea breeze
On many coastlines, the wind follows a daily rhythm driven by temperature:
- Early morning: the land has cooled overnight. Winds are often light, and on some coasts a gentle land breeze blows offshore. This is why surfers go out at dawn.
- Late morning to afternoon: the sun heats the land faster than the sea. Warm air over land rises, and cooler air flows in from the ocean as an onshore sea breeze. It often builds through the day.
- Evening: as the land cools, the sea breeze usually eases. Some evenings go glassy again.
This pattern is strongest on sunny, warm days and weaker when it’s overcast or when a larger weather system is driving the wind. Always check the hourly forecast rather than assuming the pattern will hold.
How to tell wind direction relative to your beach
Forecasts give wind direction as where the wind is coming from, in compass points or degrees. A “west wind” or “270°” blows from the west toward the east. To know whether that’s offshore at your spot, you need to know which way your beach faces.
Here’s a simple method:
- Find which way your beach faces. Stand at the water’s edge and look straight out to sea. Use your phone’s compass. That’s your beach’s facing direction.
- Offshore wind comes from the opposite direction. If your beach faces west (looking out to sea you’re facing west), offshore wind blows from the east.
- Onshore wind comes from the direction you’re facing. On that west-facing beach, a west wind is onshore.
- Cross-shore is roughly 90° either side. On a west-facing beach, north and south winds are cross-shore.
| Beach faces | Offshore wind from | Onshore wind from | Cross-shore from |
|---|---|---|---|
| North | South | North | East or West |
| East | West | East | North or South |
| South | North | South | East or West |
| West | East | West | North or South |
Winds that sit between these, such as cross-offshore, are often excellent. A cross-offshore breeze can be the best wind of all at some spots.
Clues on the beach
If you’re already at the beach, look around:
- Flags and trees show which way the wind is blowing.
- Spray off the back of waves means offshore.
- Whitecaps and chop moving toward shore mean onshore.
- Sand blowing toward the water means offshore; sand blowing up the beach means onshore.
Putting wind together with the rest of the forecast
Wind is one piece. Once you know the clean hours, check whether the tide suits your break in that window (see how tides affect surf) and whether the swell is big and long enough to show up. The full routine is in how to read a surf forecast.
Surfast shows hourly wind alongside swell and tide and suggests a best time today window, which is a handy shortcut when you’re deciding whether to set an early alarm.
Frequently asked questions
Offshore is better. It blows from land to sea, smoothing the wave face and holding waves up so they break more cleanly. Onshore wind pushes waves over early and adds chop.
As a rule of thumb, offshore wind above roughly 20 knots (37 km/h, 23 mph) starts causing problems: it can make it hard to paddle into waves, blows spray into your eyes and can push you out to sea if you get into trouble.
Glassy means there's little or no wind, so the ocean surface is smooth and mirror-like. It typically happens early in the morning or in the evening when winds drop.
On many coasts, winds are lightest early in the day. As the land heats up, an onshore sea breeze often builds by late morning or early afternoon and roughs up the surface.