How to Read a Surf Report: Wave Height, Period, Wind & Tides
A surf report can look like a wall of numbers and arrows. But once you know what each number is telling you, you can size up a session in about ten seconds. Here's how to read every part of a surf report — and how to tell the difference between a forecast and what's actually happening at the beach.
Wave height
Wave height is the headline number, usually given as a range like 2–3 ft or a height plus an occasional set, e.g. 3 ft with sets to 5 ft. Two things matter more than the number itself: how the spot handles that size, and who's measuring. Hawaiian-scale and face-scale measurements can differ by nearly double, so always check what scale a report uses before you trust it.
A beginner-friendly beach break might be perfect at 2–3 ft and unmanageable at 6 ft, while a sheltered point may need a bigger swell just to break at all. The number only means something relative to the spot.
Swell period — the most underrated number
Swell period is the time in seconds between waves. It tells you how much power the swell carries, and it's the single best predictor of whether the surf will be good. Two swells can both read 3 ft but feel completely different:
- Short period (6–9 seconds): local wind swell — weak, choppy, closes out easily.
- Medium period (10–13 seconds): decent groundswell — organized, rideable waves.
- Long period (14+ seconds): powerful groundswell that traveled a long way — punchy, well-spaced sets that wrap into more spots.
If you only learn one thing about surf reports, learn to favor longer periods. A 3 ft at 16 seconds will almost always be a better surf than 4 ft at 8 seconds.
Swell direction
Direction (shown in degrees or as a compass label like WNW) tells you where the swell is coming from. Each spot has windows it likes: a beach exposed to the west will light up on a west swell and stay flat on a south swell, even if the buoy reading is big. Learning your local spot's preferred swell direction is what separates scoring from skunking.
Wind
Wind makes or breaks a session. The terms you'll see:
- Offshore: wind blowing from land out to sea. Holds waves up and grooms them clean — this is what you want.
- Onshore: wind blowing from sea to land. Flattens and chops up the surf.
- Cross-shore: blowing along the beach. Usually messy.
Wind is also why dawn patrol is a thing: mornings are often glassy (no wind) before the daytime onshore sea breeze fills in.
Tides
Most reports show a tide graph with highs and lows. Some spots only work on a pushing (incoming) tide, others on a draining (outgoing) one, and some close out at dead high or get too shallow at low. Tide preference is spot-specific — track which tide your break likes over a few sessions and a vague report turns into a reliable plan.
Forecast vs. what's actually happening
Here's the catch with every surf report built only on models and buoys: it's a prediction. Buoys sit miles offshore, models update on a schedule, and none of them can see the crowd, the shifting sandbar, or the squall that just blew through. The gap between forecast and reality is where good sessions get missed.
That's exactly why on-the-ground reports from surfers who are out there right now are so valuable. A live report tells you the things a forecast never can: that it's actually 2 ft and crowded, or firing and empty, at this moment.
Your quick pre-surf checklist
- Wave height — and is it the right size for this spot?
- Period — longer is better; favor 12+ seconds.
- Swell direction — does this spot like it?
- Wind — offshore or light is ideal.
- Tide — is it the tide this break wants?
- Live reports — what are surfers actually seeing right now?
Run that list and you'll know whether to grab your board or have another coffee — no guessing required.