Surf Forecasts:
Sandy Beach surf forecast from 20 Aug 2026:
- Most powerful swell: Wednesday 26 Aug, 8PM (local time) - 2.5ft (0.8m), 19s period, S swell with 450 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 0.8m 19s and forecast to arrive on Wednesday (Aug 26) at 8PM. 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+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Wed 26th Aug) | 2.5ft (0.8m) 19s |
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 on the cards for Sandy Beach over the next couple of weeks.
Straight up, it's a bit of a tough stretch ahead. We've got a long dry spell to start with. From Thursday the 20th of August all the way through to the very end of the month, it's basically no-go. The swell is there, but the winds are a nightmare. Strong, cross-shore breezes, mostly from the ENE, just thrash the surface. It'll be lumpy, messy cross-chop, not something you'd want to paddle into. Even when the swell gets a bit of size, like on the 23rd with 6ft from the ENE and moderate wave energy (482), it's accompanied by a strong breeze that kills any chance of a clean face.
There's a glimmer right at the end, though. The 31st of August and the 1st of September start to show some promise, but it's still marginal. The swell jumps to 8ft to 8ft from the ENE, with a long period of 13 seconds and strong, very strong wave energy (1880 to 1999), which is a proper groundswell. That’s a lot of water moving. But the wind is still a fresh cross-shore, so the surface won't be glassy. It's not ideal, and with that size, it's really only for the experienced crew. Sandy Beach is a beach and reef setup, and with that kind of period, the long lines might make it a bit straight for a beach break.
If we look at the very end of the forecast, around the 2nd of September, things get closer. Still, the wind is cross-shore, but light enough that it might be workable for someone who doesn't mind a bit of texture. The swell is still a solid 7ft to 7ft, with a period dropping to 10-12 seconds. It’s powerful stuff, but it's going to be a bit lumpy. Honestly, with the persistent onshore/cross-shore wind and the size of the swell, this setup looks like it could be more interesting for kite surfing than paddle surfing on most days.
So, where does that leave us? There are no standout days. The best you're looking at is the window from the 31st of August to the 2nd of September, but that's over a week away and the conditions are still marginal with that cross-wind. For a spot like Sandy Beach that is fairly consistent, this is a long, blank run. Forecasts can always change, and with that much swell energy on the charts, hopefully the wind will play ball and clean it up. But right now, don't hold your breath.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Fri afternoon, min 25°C on Wed night). Winds increasing (light winds from the ENE on Thu night, strong winds from the ENE by Sat afternoon). | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Mon afternoon. Warm (max 26°C on Mon morning, min 25°C on Sat night). Winds decreasing (strong winds from the ENE on Sun night, moderate winds from the E by Mon night). | ||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | ||||||||||||||
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 | SSW 18 | SSW 17 | ENE 7 | NNE 7 | ENE 7 | SSW 16 | ENE 6 | ENE 6 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 7 | E 7 | ENE 7 | ENE 7 |
Wave Graph  | |||||||||||||||||||
 kJ | 153 | 207 | 200 | 108 | 31 | 48 | 322 | 80 | 207 | 255 | 316 | 268 | 342 | 280 | 227 | 317 | 329 | 319 | 218 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross-on | cross | cross-on | cross | cross | cross-on |
High Tide | 10:20AM0.55m | 8:45PM0.20m | 11:21AM0.57m | 10:59PM0.20m | 12:10PM0.60m | 00:02AM0.21m | 12:51PM0.62m | 00:45AM0.24m | 1:26PM0.65m | 1:20AM0.27m | 1:56PM0.66m | 1:55AM0.30m | |||||||
Low Tide | 2:00AM0.10m | 7:38PM0.20m | 3:06AM0.11m | 7:49PM0.17m | 4:20AM0.10m | 8:09PM0.14m | 5:23AM0.08m | 8:29PM0.12m | 6:13AM0.06m | 8:49PM0.11m | 6:56AM0.04m | 9:09PM0.10m | |||||||
 |  | |  | | | | | | | | | |  |  |  | | | | |
 | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — |
 | 6:57 | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 2 | 2 | 1 | 3 |
Temp °C | 25 | 26 | 26 | 26 | 26 | 27 | 27 | 26 | 26 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 26 |
Feels °C | 24 | 28 | 28 | 29 | 29 | 30 | 28 | 24 | 23 | 22 | 22 | 21 | 21 | 24 | 25 | 26 | 26 | 24 | 26 |
Swell 1 Height (m) Direction Period (s) | ENE 7 | E 8 | ENE 7 | ENE 7 | SW 17 | ENE 7 | ENE 7 | SW 16 | SW 16 | SSW 16 | SW 15 | SSW 15 | SW 14 | SSW 14 | E 8 | SSW 13 | SSW 12 | SSW 16 | SSW 15 |
| kJ | 153 | 54 | 131 | 108 | 291 | 48 | 85 | 261 | 255 | 212 | 115 | 191 | 100 | 166 | 51 | 93 | 86 | 142 | 121 |
Swell 2 Height (m) Direction Period (s) | SW 16 | NE 6 | SSW 17 | SW 16 | NNE 7 | SW 16 | SSW 16 | E 8 | W 11 | S 14 | S 13 | SSE 13 | SSE 13 | SSE 12 | SSW 13 | SSE 11 | SSW 16 | SSW 12 | SSE 10 |
| kJ | 129 | 43 | 200 | 274 | 31 | 264 | 322 | 43 | 62 | 104 | 90 | 34 | 96 | 50 | 156 | 43 | 146 | 56 | 52 |
Swell 3 Height (m) Direction Period (s) | S 12 | SSW 18 | W 11 | W 9 | W 11 | NNE 7 | WNW 10 | W 10 | S 12 | WNW 10 | SSW 15 | S 11 | SSW 15 | SSW 18 | SSE 12 | SSW 17 | SSE 7 | SSE 7 | SSW 12 |
| kJ | 45 | 207 | 37 | 27 | 57 | 26 | 32 | 51 | 47 | 33 | 76 | 22 | 71 | 62 | 48 | 94 | 18 | 9 | 55 |
Wind waves Height (m) Direction Period (s) | NNE 6 | — | — | — | — | — | — | ENE 6 | ENE 6 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 7 | E 7 | ENE 7 | ENE 7 |
| kJ | 51 | — | — | — | — | — | — | 80 | 207 | 255 | 316 | 268 | 342 | 280 | 227 | 317 | 329 | 319 | 218 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 16 | 5 | 14 | 5 | 5 | 5 | 5 | 48 | 57 | 57 | 61 | 111 | 57 | 55 | 55 | 47 | 16 | 47 | 18 |
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.
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