Surf Forecasts:
Sandy Beach surf forecast from 13 Aug 2026:
- Most powerful swell: Sunday 16 Aug, 8AM (local time) - 13ft (4.0m), 9s period, E swell with 2,478 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 4.0m 9s and forecast to arrive on Sunday (Aug 16) 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 0.5m 16s period and expected on Wednesday (Aug 19) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Sun 16th Aug) | 13ft (4.0m) 9s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
Howdy, Rusty here. Let’s cut to it – Sandy Beach is the only spot on the menu, and the outlook from August 12th through the 27th is a total dud for surf. No ifs, ands, or buts.
We kick off Wednesday August 12th with a little 3ft southerly groundswell running a long 18-second period. Sounds alright, but the wind is hammering from the ENE at 25 mph, smashing a strong cross-shore that’s got it looking like a washing machine. The combined energy is moderate (911). Water temp is 81°, right where it should be. But the surf is just no good.
It gets no better. Thursday 13th and Friday 14th stay pinned with fresh to strong ENE winds, cross and cross-onshore. The swell Friday hits 7ft from the ENE with a short 8-second period and moderate energy (925). By Saturday 15th it’s a beast – 12 to 13ft from the E with energy blowing into the 1800s and 2500s. But the wind is a near-gale at 31 mph, cross-shore. This is full-on kite weather, not paddle surfing. Anyone out there would be an expert and still be miserable.
Sunday 16th brings storm risk, cross-onshore wind, and solid 8 to 12ft waves. The whole next week from Monday 17th onward drops back to between 2ft and 6ft, but the wind just sticks around – fresh to moderate ENE breezes at 15-19 mph, always cross or onshore. The energy plummets into the low 100s to mid-500s by the end, which is weak. The period sometimes stretches from the S or SSW at 14-18 seconds, a long groundswell, but with the wind on it, it’s a total mess.
Bottom line – there is zero good surf across the entire 16 days. For a spot that’s exposed like Sandy Beach, this kind of dead run is pretty standard when the trade winds get locked in. Stash the board for now. Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Wed night, min 25°C on Wed afternoon). Winds increasing (fresh winds from the ENE on Wed night, near gales from the ENE by Sat morning). | Days 5-7 Weather SummaryModerate rain (total 10mm), heaviest on Sun afternoon. Warm (max 26°C on Sat afternoon, min 25°C on Sat night). Winds decreasing (near gales from the ENE on Sun morning, fresh winds from the ENE by Mon night). | |||||||||||||||||||
Wed 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | ||||||||||||||
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 18 | S 16 | S 16 | S 15 | S 15 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | E 9 | E 9 | E 9 | ENE 9 | ENE 8 | ENE 8 | S 14 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 498 | 520 | 501 | 662 | 537 | 514 | 509 | 865 | 1592 | 2353 | 1979 | 1646 | 819 | 561 | 318 | 260 | 203 | 188 | 139 | 121 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross | cross | cross-on | cross-on | cross | cross |
High Tide | 3:14PM0.76m | 3:27AM0.36m | 3:49PM0.71m | 4:15AM0.41m | 4:22PM0.64m | 5:04AM0.45m | 4:53PM0.55m | 5:55AM0.48m | 5:21PM0.47m | 6:52AM0.50m | 5:48PM0.38m | 7:56AM0.52m | 6:10PM0.31m | |||||||
Low Tide | 10:21PM0.04m | 9:11AM0.01m | 10:50PM0.04m | 10:01AM0.07m | 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 | |||||||
 |  | | | | | |  | | | |  | |  |  | | | | | | |
 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — |
 | 7:02 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | 5 | 4 | — | — | — | — | — | — |
Temp °C | 25 | 26 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 25 | 25 |
Feels °C | 22 | 24 | 23 | 23 | 22 | 22 | 23 | 22 | 21 | 21 | 20 | 22 | 25 | 24 | 23 | 23 | 22 | 22 | 23 | 24 |
Swell 1 Height (m) Direction Period (s) | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | S 14 | S 14 | S 13 | S 13 | S 13 | SSE 12 | SSE 10 | S 7 | ENE 8 | S 14 | S 13 | S 13 | ENE 7 | S 13 |
| kJ | 498 | 520 | 501 | 662 | 537 | 411 | 411 | 243 | 225 | 168 | 173 | 737 | 725 | 100 | 318 | 260 | 170 | 121 | 139 | 80 |
Swell 2 Height (m) Direction Period (s) | SSW 13 | SSW 13 | SSW 12 | W 12 | W 11 | W 12 | E 11 | E 12 | W 11 | W 13 | SE 13 | S 16 | S 16 | S 14 | S 14 | S 6 | SSE 7 | SW 17 | S 13 | W 12 |
| kJ | 218 | 170 | 113 | 11 | 10 | 11 | 63 | 103 | 10 | 30 | 44 | 83 | 127 | 250 | 264 | 20 | 17 | 74 | 119 | 25 |
Swell 3 Height (m) Direction Period (s) | W 12 | W 12 | W 12 | SW 19 | SW 18 | SW 18 | SSW 18 | W 11 | SW 17 | S 16 | S 18 | W 12 | W 12 | S 16 | S 6 | SSW 19 | W 11 | SSE 7 | SW 18 | SSE 6 |
| kJ | 25 | 25 | 11 | 14 | 13 | 12 | 30 | 9 | 12 | 42 | 56 | 25 | 25 | 81 | 20 | 37 | 10 | 9 | 79 | 8 |
Wind waves Height (m) Direction Period (s) | ENE 6 | ENE 6 | ENE 6 | ENE 6 | E 7 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | E 9 | E 9 | E 9 | ENE 9 | ENE 8 | — | ENE 7 | ENE 7 | ENE 7 | — | ENE 7 |
| kJ | 195 | 194 | 226 | 261 | 491 | 514 | 509 | 865 | 1592 | 2353 | 1979 | 1646 | 819 | 561 | — | 237 | 203 | 188 | — | 121 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 57 | 47 | 48 | 111 | 48 | 55 | 63 | 111 | 140 | 141 | 113 | 217 | 63 | 55 | 55 | 55 | 47 | 47 | 55 | 16 |
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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