Surf Forecasts:
Sandy Beach surf forecast from 15 Aug 2026:
- Most powerful swell: Sunday 16 Aug, 2AM (local time) - 16ft (5.0m), 10s period, E swell with 5,677 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 5.0m 10s and forecast to arrive on Sunday (Aug 16) at 2AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 16s period and expected on Friday (Aug 21) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Sun 16th Aug) | 16ft (5.0m) 10s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s be straight with you: the next couple of weeks at Sandy Beach are looking pretty grim for a paddle. We’ve got a long stretch of poor conditions ahead, with the first proper chance of a surf not showing up until the very end of the window. If you’re after a wave, you’re going to need some serious patience.
The pattern for the next week and a half is dominated by a stubborn cross-shore flow out of the east-northeast, and it’s not letting up. The swell is small and mixed up, and the wind is just constantly ruining any chance of clean faces. From the 15th through to the 26th, it’s a whole lot of nothing. We’re talking poor surf, chopped-up lines, and onshore energy. The combined swell energy is weak to moderate at best, sitting around 2655 at the start but dropping off to triple digits like 207, 174, and even 73 by the 22nd. It’s just not worth getting wet for.
There is a slight change around the 20th and again on the 23rd, where a long-period south-southwest swell tries to push in, but it’s tiny – only 2ft – and the cross-shore wind is still there to chop it all up. That’s a tease, not an opportunity.
Now, for the one and only standout in this whole 16-day run: Sunday, August 30th. This is the one you’ve been waiting for. The model is showing a 10ft swell out of the east-northeast, with a 14-second period. That’s some serious groundswell energy, with the combined energy reading a strong 3507. But here’s the catch, and it’s a big one: this is forecast to be too big for Sandy Beach. It’s going to be a washing machine, closing out and dumping. This is only for the experts, and even then, it’s risky. The wind is cross-shore, not offshore, at 15 mph, so it won’t be clean, but it’s the only time in the whole window where the swell has any real power behind it. It’s a promise of something good, but a promise that might break.
Before that, there’s a marginal window on the 27th and 28th, with 4ft to 5ft of east swell, but the wind is still fresh and cross-shore, making it lumpy. It’s a far cry from good.
Look, if you’re an intermediate or a beginner, stay on land until the end of August. There’s nothing for you here. And if the waves are that big on the 30th, it might be more interesting for the kite crew than the paddle crew. It’s one of those desert stretches, but the fact that this last swell shows up at all means the ocean isn’t completely dead. Forecasts can change, and this longer-range call is promising but not certain. Keep an eye on it, but don’t hold your breath.
Rusty.
Short Range ForecastHeavy rain (total 50mm), heaviest during Sat night. Warm (max 27°C on Sun afternoon, min 24°C on Sat night). Winds decreasing (gales from the ENE on Sat night, light winds from the E by Sun night). | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Thu morning, min 25°C on Mon night). Mainly fresh winds. | ||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | ||||||||||||||
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 8 | ENE 9 | E 10 | E 10 | ENE 9 | ENE 9 | ENE 8 | ENE 8 | S 14 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | E 8 | E 8 | SSW 18 | SSW 17 | ENE 7 |
Wave Graph | |||||||||||||||||||
952 | 2430 | 3286 | 5677 | 993 | 692 | 449 | 300 | 260 | 173 | 165 | 121 | 143 | 163 | 84 | 82 | 207 | 200 | 157 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross-on | on | on | cross-on | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 5:04AM0.45m | 4:53PM0.55m | 5:55AM0.48m | 5:21PM0.47m | 6:52AM0.50m | 5:48PM0.38m | 7:56AM0.52m | 6:10PM0.31m | 9:08AM0.53m | 10:20AM0.55m | 8:45PM0.20m | ||||||||
Low Tide | 11:17PM0.04m | 10:54AM0.13m | 11:44PM0.05m | 11:53AM0.20m | 00:11AM0.05m | 1:08PM0.25m | 00:39AM0.07m | 2:59PM0.27m | 1:14AM0.09m | 2:00AM0.10m | 7:38PM0.20m | 3:06AM0.11m | |||||||
— | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | |
7:00 | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | |
mm | — | 1 | 1 | 23 | 15 | 7 | 3 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 26 | 26 | 26 | 26 | 27 | 27 | 25 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 25 |
Feels °C | 22 | 21 | 21 | 20 | 24 | 27 | 28 | 24 | 26 | 23 | 23 | 23 | 23 | 24 | 24 | 24 | 26 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | S 14 | S 13 | S 13 | S 14 | SSE 9 | ENE 9 | ENE 8 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 | ENE 8 | E 8 | E 8 | E 8 | SSW 17 | ENE 7 |
243 | 225 | 168 | 184 | 592 | 692 | 449 | 264 | 260 | 170 | 165 | 119 | 80 | 163 | 84 | 82 | 78 | 200 | 157 | |
Swell 2 Height (m) Direction Period (s) | W 11 | W 11 | S 16 | S 18 | S 16 | SSE 8 | S 7 | S 6 | SSW 6 | SSW 5 | SW 17 | SW 18 | SSE 7 | SW 16 | NE 6 | NE 6 | SSW 18 | S 11 | SW 16 |
9 | 9 | 80 | 56 | 188 | 302 | 92 | 48 | 13 | 5 | 74 | 80 | 15 | 129 | 42 | 34 | 207 | 21 | 274 | |
Swell 3 Height (m) Direction Period (s) | SSW 18 | SW 17 | W 13 | W 13 | SSW 13 | S 10 | S 14 | SW 18 | SSE 6 | W 11 | SW 7 | SSE 8 | SW 18 | S 12 | SSW 12 | SW 16 | S 11 | SSW 8 | S 15 |
30 | 12 | 30 | 30 | 53 | 75 | 250 | 50 | 10 | 10 | 11 | 19 | 79 | 44 | 48 | 129 | 22 | 6 | 38 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 9 | E 10 | E 10 | ENE 9 | — | — | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | — | — | — | NE 6 | ENE 7 | — |
952 | 2430 | 3286 | 5677 | 993 | — | — | 300 | 231 | 173 | 141 | 121 | 143 | — | — | — | 43 | 121 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 216 | 217 | 217 | 225 | 57 | 42 | 20 | 48 | 19 | 47 | 48 | 47 | 16 | 47 | 16 | 16 | 47 | 5 | 14 |
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.











