Surf Forecasts:
Sandy Beach surf forecast from 18 Aug 2026:
- Best quality surf: Thursday 20 Aug, 8PM (local time) - 2ft (0.6m), 17s period, SSW swell with cross-offshore winds.
- Most powerful swell: Saturday 22 Aug, 11PM (local time) - 6.5ft (2.0m), 7s period, ENE swell with 371 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 8PM (local time) - 2ft (0.6m), 17s 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 8PM. The primary swell is predicted to be 0.6m and 17s 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 2.0m 7s and forecast to arrive on Saturday (Aug 22) at 11PM. 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+) | 8PM (Thu 20th Aug) | 2ft (0.6m) 17s |
| Best Surf | 8PM (Thu 20th Aug) | 2ft (0.6m) 17s |
| Most Powerful | 11PM (Sat 22nd Aug) | 6.5ft (2.0m) 7s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
Alright, Rusty here. Let's have a look at what's shaping up.
Honestly, it's a tough stretch ahead. For the next week and a half, the conditions are just not playing ball. We’re looking at a long run of poor surf at Sandy Beach, with the wind stuck in an ENE pattern that’s going to mess things up.
Starting on Monday the 17th and running right through to around the 26th of August, it's a write-off. The wind is coming in strong from the east-northeast, creating a lumpy, cross-shore chop that’s going to ruin any chance of a clean wave. The swell is there, but it's weak or short-period windswell, and the wind is just too raw. The combined swell energy stays moderate for most of this time, in the low to mid hundreds, but the quality is just not there. You’d be fighting a messy, bumpy surface.
The wind is relentless. From Monday the 17th onward, it's a moderate to fresh breeze, sometimes even a strong breeze, always cross-shore. It’s the kind of wind that makes you paddle hard for a lumpy, sectiony wave. Not worth it. The swell size stays small, under 1.5m (about 5 ft), so it’s not even a power thing—it’s just ugly.
Then from the 23rd of August onward, the swell starts to build, but the wind stays strong and cross-shore. By Monday the 25th, the swell is up to 2.5m (about 8 ft), but with that 28 mph cross-shore wind, it’s a messy, blown-out mess. The combined wave energy jumps up into the four-digit range, showing there’s a lot of power, but the conditions are terrible. It’s the kind of setup that looks more interesting for kite surfing than paddle surfing. This gets even bigger on Wednesday the 26th, with 3.5m (about 12 ft) swells and massive energy, but still a strong cross-shore wind. Not for paddling.
The only glimmer in the whole 16-day run is on Thursday the 27th of August. The forecast actually says "wind and tide favorable" for Sandy Beach, but there’s a catch. The swell is predicted to be 3.5m (about 12 ft) from the east with a 9-second period. That’s a lot of water moving, with massive combined energy. For a beach and reef break, that’s expert territory only. The wind is still a fresh cross-shore, but the conditions are supposed to align. If you’re a seasoned charger with a big-wave gun, this might be your window. For everyone else, it’s a day to watch from the sand. The rest of that week and into September, it's back to poor surf and strong winds.
Water temp is sitting at a very normal 80°F for this time of year, so no surprises there.
So, to be straight with you: don't bother getting the board wet until that Thursday the 27th, and even then, only if you know what you’re doing. This is a long blank run. It happens here sometimes. Forecasts can change, but right now, it’s a waiting game.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Mon morning, min 24°C on Mon night). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Thu morning, 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) | ENE 8 | S 14 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 8 | E 8 | E 8 | SSW 18 | SSW 17 | E 7 | NE 7 | NE 7 | SSW 16 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph | |||||||||||||||||||||
334 | 260 | 172 | 145 | 149 | 151 | 107 | 100 | 82 | 207 | 200 | 52 | 47 | 67 | 322 | 87 | 166 | 302 | 285 | 241 | 326 | |
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-on | cross-on | cross | cross | cross | cross-on | 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 | 26 | 25 | 25 | 25 | 25 |
Feels °C | 25 | 24 | 23 | 23 | 23 | 23 | 25 | 25 | 25 | 27 | 27 | 27 | 29 | 28 | 28 | 27 | 24 | 24 | 23 | 22 | 22 |
Swell 1 Height (m) Direction Period (s) | S 14 | S 14 | S 13 | ENE 7 | S 13 | S 13 | E 8 | E 8 | E 8 | E 8 | E 7 | E 7 | NE 7 | NE 7 | ENE 7 | SW 16 | SW 16 | SSW 16 | SW 15 | SSW 15 | SW 14 |
334 | 260 | 170 | 145 | 119 | 116 | 107 | 84 | 82 | 72 | 70 | 52 | 47 | 67 | 68 | 261 | 255 | 212 | 115 | 191 | 99 | |
Swell 2 Height (m) Direction Period (s) | S 6 | SSE 5 | E 9 | S 13 | SW 18 | SW 18 | NNE 6 | SSW 16 | NE 6 | SSW 18 | SSW 17 | SW 16 | SW 17 | SW 16 | SSW 16 | E 8 | S 12 | SSE 12 | S 13 | SSE 13 | SSE 13 |
23 | 6 | 25 | 121 | 80 | 79 | 26 | 100 | 33 | 207 | 200 | 274 | 291 | 261 | 322 | 21 | 47 | 50 | 90 | 35 | 56 | |
Swell 3 Height (m) Direction Period (s) | SW 18 | SSW 19 | SW 6 | SW 17 | W 13 | W 12 | SW 16 | S 12 | SW 16 | NNE 6 | NNE 7 | NNE 7 | E 7 | W 10 | S 13 | WNW 10 | WNW 10 | WNW 10 | SSW 15 | S 11 | SSW 15 |
50 | 37 | 6 | 74 | 31 | 25 | 129 | 45 | 129 | 27 | 29 | 26 | 23 | 18 | 54 | 32 | 34 | 20 | 76 | 22 | 71 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 7 | ENE 7 | — | ENE 7 | ENE 7 | — | NE 6 | — | — | — | — | — | — | — | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
283 | 231 | 172 | — | 149 | 151 | — | 31 | — | — | — | — | — | — | — | 87 | 166 | 302 | 285 | 241 | 326 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 47 | 47 | 47 | 47 | 47 | 20 | 16 | 16 | 5 | 14 | 5 | 5 | 5 | 5 | 16 | 14 | 47 | 47 | 47 | 110 | 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.











