
Surf Forecasts:
Sandy Beach surf forecast from 11 Sep 2026:
- Most powerful swell: Thursday 17 Sep, 2PM (local time) - 7ft (2.2m), 8s period, ENE swell with 666 kJ wave energy.
Best Forecast Surf Conditions for Sandy Beach this week:
The most powerful waves expected at Sandy Beach in the next 16 days are 2.2m 8s and forecast to arrive on Thursday (Sep 17) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 18s period and expected on Wednesday (Sep 16) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Thu 17th Sep) | 7ft (2.2m) 8s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
Alright, let’s get into it. Rusty here, looking at what’s heading our way.
Right off the bat, I gotta be straight with you – we’re looking at a long, grim stretch, and it’s gonna test your patience. For the first twelve days, from Thursday the 10th through to Monday the 21st of September, it’s a write-off. We’ve got persistent cross-shore winds, mostly from the ENE, blowing at a solid 15 to 25 mph. The swell’s all over the place in size but the quality is just not there. It’s all labeled as “poor surf conditions” and honestly, the combined swell energy is low to moderate, mostly between 117 and 985, but the wind is just wrecking everything into lumpy, messy cross-chop. For a spot like Sandy Beach, exposed as it is, this is just a no-go. You’d be better off finding a flat-water spot or, to be honest, the setup looks more interesting for kite surfing than paddle surfing right now.
Now, I see a little glimmer towards the very end of the forecast. On Tuesday the 22nd of September, things start to change. The surf is still nothing special – it’s a “marginal surf forecast or questionable tide conditions” situation with a score of only 1/10. But the wind backs off. Tuesday morning we get a gentle breeze from the E at 9 mph, and Tuesday afternoon the wind drops to a light breeze from the ENE at 6 mph. The swell picks up to a consistent 5 ft to 5 ft from the ENE with a period of 10 seconds, giving a moderate wave energy of 559 to 586. It’s still cross-onshore, but with the wind that light, you’ll get small wind ripples, not full-on chop. It’s not the standout, but it’s the most surfable day in over a week.
However, the true, and I mean *true* highlight comes on Wednesday the 23rd of September. This is the one. The swell jumps to 6 ft from the E, with a long-period of 12 seconds – that’s proper groundswell energy. The combined energy is very strong, hitting 1311. The morning has a moderate cross-onshore breeze (12 mph) which will keep it a bit messy, but by the afternoon the wind shifts to cross-shore and lightens to a moderate 15 mph, leading to a cross-chop instead of full-on chunk. The forecast kicks up to a score of 2/10, which is the best we see. This is the standout of the whole 16-day window. That long-period east swell will produce some decent lines at Sandy Beach, though it might break a bit straight being a beach and reef setup. For the experienced surfers out there, this Wednesday afternoon session is the one to circle.
After that, Thursday the 24th and Friday the 25th of September are again marginal, with the swell dropping off and lighter but onshore winds. Nothing to get too excited about.
Overall, it’s a rough run, but that Wednesday the 23rd is your big payoff. Keep your eyes on it, but remember this is long-range so it’s promising but less certain. Hang in there.
- Rusty
Short Range ForecastMostly dry. Warm (max 25°C on Thu night, min 24°C on Fri night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Tue morning, min 24°C on Sun night). Mainly strong winds. | ||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | |||||||||||||||||||
Wave Height (m) Direction Period (s) | ENE 7 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | NNE 9 | NE 9 | NE 9 | NE 9 | NE 8 | NE 8 | NE 8 | NE 8 | NE 8 | SSW 19 | ENE 7 | SSW 18 | ENE 7 |
Wave Graph | |||||||||||||||||||
158 | 370 | 313 | 187 | 160 | 98 | 99 | 115 | 115 | 77 | 139 | 129 | 114 | 94 | 82 | 470 | 227 | 541 | 456 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 3:11AM0.50m | 3:13PM0.59m | 3:51AM0.55m | 3:42PM0.51m | 4:32AM0.57m | 4:10PM0.44m | 5:15AM0.59m | 4:37PM0.37m | 6:02AM0.58m | 5:04PM0.30m | 6:56AM0.56m | 5:30PM0.25m | |||||||
Low Tide | 9:26PM0.04m | 9:14AM0.08m | 9:49PM0.03m | 10:05AM0.12m | 10:11PM0.04m | 10:58AM0.16m | 10:34PM0.05m | 11:57AM0.20m | 10:58PM0.06m | 1:10PM0.23m | 11:24PM0.09m | 2:59PM0.23m | 11:56PM0.11m | ||||||
— | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | |
6:37 | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 26 |
Feels °C | 23 | 24 | 24 | 25 | 24 | 24 | 25 | 24 | 24 | 25 | 24 | 24 | 24 | 26 | 25 | 26 | 25 | 24 | 24 |
Swell 1 Height (m) Direction Period (s) | SW 16 | ENE 11 | SW 15 | ENE 10 | ENE 10 | NE 9 | NNE 9 | NE 9 | NE 9 | NE 9 | SW 14 | SW 22 | NE 8 | NE 8 | SW 19 | SSW 19 | SW 18 | SSW 18 | SW 17 |
268 | 370 | 229 | 187 | 160 | 81 | 99 | 115 | 115 | 77 | 49 | 227 | 114 | 94 | 384 | 470 | 455 | 541 | 429 | |
Swell 2 Height (m) Direction Period (s) | E 11 | SW 16 | NNE 8 | SW 15 | NE 8 | ENE 10 | SSW 13 | SW 15 | SSW 15 | SW 12 | SW 23 | SW 14 | SW 21 | SW 20 | E 12 | E 11 | SW 12 | SW 11 | SW 11 |
93 | 261 | 39 | 226 | 74 | 98 | 68 | 107 | 84 | 38 | 86 | 49 | 224 | 392 | 42 | 58 | 35 | 31 | 19 | |
Swell 3 Height (m) Direction Period (s) | S 12 | NNE 8 | SSW 12 | NNE 8 | SW 15 | SW 16 | SW 16 | SSW 12 | SW 12 | ENE 8 | SSW 11 | SSW 11 | SSW 13 | SW 13 | E 7 | NNE 8 | WSW 8 | W 8 | SSE 11 |
69 | 37 | 46 | 39 | 242 | 124 | 64 | 57 | 23 | 14 | 12 | 12 | 68 | 41 | 15 | 32 | 6 | 6 | 12 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | — | ENE 11 | — | — | — | ENE 9 | E 9 | ENE 9 | NE 5 | NE 8 | NE 8 | — | — | NE 8 | ENE 6 | ENE 7 | ENE 7 | ENE 7 |
158 | — | 313 | — | — | — | 84 | 78 | 59 | 22 | 139 | 129 | — | — | 82 | 77 | 227 | 306 | 456 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 49 | 18 | 47 | 16 | 16 | 47 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 14 | 47 | 47 | 47 | 55 | 55 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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Information about the Sandy Beach Surf forecast
The above surf forecast table for Sandy Beach provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Sandy Beach can be found by selecting the local surf guide option on the grey menu. Our Sandy Beach surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Sandy Beach) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Sandy Beach may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Sandy's Beach is 15 km (9 miles) from the city of Kailua. If you plan a vacation in Oahu, look for hotels and other accommodation in Kailua. Kailua has rooms for a wide range of budgets as well as car hire and transport links.










