Surf Forecasts:
Sandy Beach surf forecast from 17 Aug 2026:
- Best quality surf: Thursday 20 Aug, 11PM (local time) - 2ft (0.6m), 16s period, SSW swell with cross-offshore winds.
- Most powerful swell: Monday 24 Aug, 8AM (local time) - 6ft (1.9m), 7s period, ENE swell with 348 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 11PM (local time) - 2ft (0.6m), 16s period with SSW swell.
Best Forecast Surf Conditions for Sandy Beach this week:
The surf forecast for Sandy Beach over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 20) at 11PM. The primary swell is predicted to be 0.6m and 16s period with a secondary swell of 0.8m and 7s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Sandy Beach in the next 16 days are 1.9m 7s and forecast to arrive on Monday (Aug 24) at 8AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 16s period and expected on Friday (Aug 21) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Thu 20th Aug) | 2ft (0.6m) 16s |
| Best Surf | 11PM (Thu 20th Aug) | 2ft (0.6m) 16s |
| Most Powerful | 8AM (Mon 24th Aug) | 6ft (1.9m) 7s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s coming up for Sandy Beach. I gotta be straight with you – the next 16 days are a real mixed bag, and honestly, for a good while, it’s gonna be a waiting game. The pattern is dominated by persistent cross-shore and cross-onshore winds from the ENE, which is going to mess up the surface quality, leaving things choppy and lumpy more often than not. There’s a big gap of poor conditions right at the start, so don’t rush to paddle out just yet.
The first few days, from Monday the 17th through to the 22nd, are pretty grim. We’re looking at small, short-period windswell in the 1ft to 4ft range, but the wind is constantly a problem. The wave energy is weak to moderate at best. It’s just not going to be any fun with that lumpy cross-chop. You’ll be fighting for a close-out, not a wave.
We finally get a bit of size as we head into the 23rd and 24th, with swell heights pushing 5ft to 6ft and the energy picking up to moderate levels. But the wind is still fresh and cross-shore, so the quality is still poor. This is a kite-surfing setup, not a paddle-surfing one. The waves will be there, but they’ll be lumpy, bumpy, and hard to ride.
Now, things get interesting, but also heavy, from the 27th of August. The swell jumps up to 10ft from the ENE, with a long period of 11 seconds. The energy is very strong. This is big, powerful groundswell. The forecast notes the wind and tide could be favorable, but the size is listed as too big for this break. This means Sandy Beach is only for the most experienced experts who know the lineup. The moderate cross-shore wind will add some texture, but with that much energy, it’s going to be a heavy, dangerous day. This is the standout window, but it’s a serious one.
The last couple of days of August and into September see the size drop back down, but the wind remains a factor, keeping the surf messy. The 1st of September brings 8ft swell with a 10-second period from the east, and conditions are still marginal.
So, the best window is that big swell from the 27th to the 29th of August. It’s a bold, powerful, and expert-only affair. For the rest of us, it’s a long wait for a clean day. The water temp is about average for the time of year, so no surprise there. Keep your eye on the forecasts, but for now, don’t expect much.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Mon morning, min 24°C on Tue night). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Sat afternoon, min 25°C on Thu morning). Winds increasing (light winds from the NE on Thu night, fresh winds from the ENE by Sat night). | ||||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | |||||||||||||||
AM | PM | 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) | S 14 | S 14 | S 13 | ENE 7 | ENE 7 | S 13 | E 8 | E 8 | E 8 | SSW 18 | SSW 17 | NE 7 | ENE 7 | ENE 7 | SSW 16 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 6 | ENE 7 |
Wave Graph | |||||||||||||||||||||
334 | 260 | 222 | 165 | 143 | 132 | 109 | 100 | 80 | 207 | 200 | 73 | 57 | 48 | 322 | 129 | 113 | 303 | 262 | 280 | 335 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross | cross | cross-on | cross | cross | cross | cross | cross | cross-off | cross-on | cross-on | cross | cross-on | cross-on | cross | cross | cross | cross |
High Tide | 5:48PM0.38m | 7:56AM0.52m | 6:10PM0.31m | 9:08AM0.53m | 10:20AM0.55m | 8:45PM0.20m | 11:21AM0.57m | 10:59PM0.20m | 12:10PM0.60m | 00:02AM0.21m | 12:51PM0.62m | 00:45AM0.24m | |||||||||
Low Tide | 1:08PM0.25m | 00:39AM0.07m | 2:59PM0.27m | 1:14AM0.09m | 2:00AM0.10m | 7:38PM0.20m | 3:06AM0.11m | 7:49PM0.17m | 4:20AM0.10m | 8:09PM0.14m | 5:23AM0.08m | 8:29PM0.12m | |||||||||
6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | |
— | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 25 | 26 | 26 | 26 | 26 | 27 | 26 | 26 | 25 | 25 |
Feels °C | 25 | 24 | 23 | 24 | 22 | 23 | 25 | 25 | 26 | 27 | 27 | 27 | 29 | 28 | 28 | 27 | 27 | 27 | 24 | 22 | 22 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | ENE 7 | S 13 | ENE 7 | ENE 7 | S 13 | E 8 | E 8 | E 8 | E 8 | E 8 | NE 7 | ENE 7 | ENE 7 | SSW 16 | NE 7 | SW 16 | SSW 16 | SSE 13 | SSW 15 | SW 14 |
250 | 228 | 222 | 141 | 143 | 116 | 109 | 84 | 80 | 74 | 54 | 73 | 57 | 48 | 322 | 54 | 255 | 212 | 101 | 191 | 99 | |
Swell 2 Height (m) Direction Period (s) | S 14 | S 14 | SW 6 | S 13 | S 13 | SW 18 | NNE 7 | SSW 16 | NE 6 | SSW 18 | NE 7 | SW 16 | SW 17 | SW 16 | S 13 | SW 16 | E 8 | SSE 12 | SW 15 | WNW 12 | SSE 13 |
334 | 260 | 6 | 165 | 119 | 79 | 29 | 100 | 31 | 207 | 35 | 274 | 291 | 261 | 54 | 261 | 33 | 51 | 113 | 27 | 56 | |
Swell 3 Height (m) Direction Period (s) | S 6 | SSE 5 | W 11 | SW 17 | SW 18 | W 12 | SW 16 | S 12 | SW 16 | NE 6 | SSW 17 | E 8 | NNE 7 | NNE 6 | E 8 | E 6 | S 12 | WNW 10 | SSW 15 | S 11 | SSW 15 |
23 | 10 | 10 | 74 | 80 | 25 | 129 | 45 | 129 | 32 | 200 | 31 | 19 | 28 | 12 | 36 | 47 | 19 | 76 | 22 | 71 | |
Wind waves Height (m) Direction Period (s) | — | — | ENE 7 | — | — | ENE 7 | — | NE 6 | — | — | — | — | — | — | ENE 7 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 6 | ENE 7 |
— | — | 203 | — | — | 132 | — | 31 | — | — | — | — | — | — | 68 | 129 | 113 | 303 | 262 | 280 | 335 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 47 | 19 | 20 | 47 | 47 | 16 | 16 | 16 | 14 | 16 | 5 | 0 | 5 | 17 | 16 | 42 | 47 | 47 | 48 | 61 | 47 |
Best forecast wave conditions in Oahu | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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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.











