
Surf Forecasts:
Sandy Beach surf forecast from 12 Aug 2026:
- Best quality surf: Sunday 16 Aug, 11PM (local time) - 11ft (3.5m), 10s period, ENE swell with onshore winds.
- Most powerful swell: Sunday 16 Aug, 2AM (local time) - 11ft (3.5m), 10s period, ENE swell with 2,493 kJ wave energy.
- Next surfable swell (1★+): Sunday 16 Aug, 11PM (local time) - 11ft (3.5m), 10s period with ENE 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 Sunday (Aug 16) at 11PM. The primary swell is predicted to be 3.5m and 10s period with a secondary swell of 0.7m and 13s. The wind is predicted to be onshore as the swell arrives.
The most powerful waves expected at Sandy Beach in the next 16 days are 3.5m 10s and forecast to arrive on Sunday (Aug 16) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 18s period and expected on Tuesday (Aug 18) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Sun 16th Aug) | 11ft (3.5m) 10s |
| Best Surf | 11PM (Sun 16th Aug) | 11ft (3.5m) 10s |
| Most Powerful | 2AM (Sun 16th Aug) | 11ft (3.5m) 10s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
Alright, grab your board, but maybe don't paddle out just yet. Rusty here, and I've been staring at the charts for Sandy Beach. The whole 16-day window is a real bummer, to be honest. There are no good days, no hidden gems, nothing that's going to get you sprinting for the water. It's a long run of poor surf.
Let's start with the beginning. Tuesday, August 11th, is clear skies, but the wind is a fresh cross-shore from the ENE at 22 mph, just junking up the whole line-up. The swell is a tiny 3 ft from the SSW, and while the combined energy is moderate at 524, the water is a warm 81°F, which is about normal for this time of year. But with that wind, it's just lumpy cross-chop.
This pattern of fresh cross-shore winds and poor surf drags on all the way through the end of the week. Wednesday the 12th, Thursday the 13th, Friday the 14th – same story. The swell is between 3 ft and 4 ft, but with a 19 to 22 mph cross-shore wind, it's just ugly. The water temp is a non-factor; it's all about the wind.
Then we hit the weekend of the 15th and 16th. The swell jumps up. Saturday the 15th sees an 8 ft to 10 ft ENE swell with a short 11-second period, but the wind is howling from the NE at 28 to 31 mph. That's a strong breeze to near gale force, creating messy cross-chop and crossing waves. The combined energy is very strong (1625 and 2153), but it's a total mess. There are also risky thunderstorms around. This isn't for a paddle board; it looks more like a kite surfing day. Sunday the 16th brings a 10 ft swell with a 10-second period, and the wind shifts onshore from the ESE at 22 mph, then SE at 16 mph. Still a nightmare. The combined energy is very strong (2012 and 1759), but the onshore wind makes it a complete write-off.
The next week is a bit better, but not by much. Monday the 17th sees a drop in swell to 7 ft, with a gentle cross-onshore wind from the ENE at 9 mph in the morning. The combined energy is moderate (1102). The report says "marginal," but with the wind on it, it's still not worth it. The rest of the week from Tuesday the 18th to Thursday the 20th is back to fresh cross-shore winds and dropping swell, with the combined energy dropping to weak levels (225 to 621). The water temp is still normal.
So, the big picture is a long gap of nothing. The swell is too small and windy, or too big and blown out. The only tiny glimmer of hope is the consistent, long-period groundswell that shows up around August 20th. The 22nd of August has a 2 ft to 2 ft swell from the S with a very long period of 19 to 20 seconds. That's the kind of energy that could be clean at a point or reef, but at Sandy Beach, a beach and reef setup, that long period might just break too straight. Plus, the wind is still a moderate cross-shore from the ENE at 16 mph, so it'll be choppy. The combined energy is moderate (380 to 547). The 23rd and 24th are similar, with S to SSW swells around 3 ft to 3 ft and periods of 14 to 18 seconds, but the wind is still a fresh cross-shore. It's a frustrating pattern.
Given how consistently poor it is, keep your eyes on the forecasts. It usually doesn't stay this flat and blown out for long, and things can change. But for now, I'd be keeping the wax in the wrapper.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Tue afternoon, min 25°C on Tue night). Mainly fresh winds. | Days 5-7 Weather SummaryHeavy rain (total 40mm), heaviest during Sat night. Warm (max 27°C on Sun afternoon, min 25°C on Fri afternoon). Winds decreasing (severe gales from the ENE on Sat night, light winds from the E by Sun night). | |||||||||||||||||||
Tue 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | ||||||||||||||
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) | SSW 14 | S 20 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | ENE 8 | ENE 8 | ENE 11 | ENE 11 | ENE 10 | E 10 | ENE 10 | ENE 10 | ENE 9 | ENE 8 | ENE 8 |
Wave Graph | ||||||||||||||||||||
269 | 276 | 509 | 498 | 520 | 501 | 662 | 537 | 411 | 411 | 533 | 1403 | 1906 | 2493 | 1763 | 1513 | 2216 | 651 | 486 | 462 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | on | on | on | cross-on | cross | cross |
High Tide | 2:36PM0.79m | 2:40AM0.31m | 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 | |||||||
Low Tide | 9:52PM0.05m | 8:22AM-0.02m | 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 | |||||||
— | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | |
7:02 | — | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 15 | 11 | 4 | 5 | 3 | 1 | — |
Temp °C | 26 | 25 | 25 | 25 | 26 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 26 | 26 | 27 | 27 | 26 | 26 | 25 |
Feels °C | 24 | 23 | 23 | 22 | 24 | 24 | 23 | 22 | 23 | 23 | 22 | 23 | 23 | 22 | 23 | 27 | 28 | 29 | 26 | 24 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 14 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 | S 13 | ENE 10 | ENE 9 | ENE 8 | ENE 8 |
269 | 243 | 509 | 498 | 520 | 501 | 662 | 537 | 411 | 411 | 306 | 222 | 168 | 173 | 116 | 119 | 1808 | 651 | 486 | 365 | |
Swell 2 Height (m) Direction Period (s) | SSE 9 | S 20 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | W 12 | W 11 | ESE 11 | W 12 | W 11 | W 11 | S 16 | S 18 | S 16 | S 16 | S 14 | S 14 | SSE 7 | S 13 |
16 | 276 | 218 | 218 | 222 | 113 | 11 | 10 | 25 | 11 | 21 | 9 | 79 | 56 | 133 | 127 | 246 | 268 | 158 | 170 | |
Swell 3 Height (m) Direction Period (s) | S 21 | SSE 9 | W 13 | W 12 | W 12 | W 12 | SW 19 | SW 18 | W 12 | SSW 18 | SSW 17 | SW 17 | W 13 | W 13 | W 12 | W 12 | S 16 | S 9 | S 14 | SSE 6 |
79 | 15 | 30 | 25 | 25 | 11 | 14 | 13 | 11 | 30 | 29 | 12 | 30 | 30 | 25 | 25 | 81 | 15 | 203 | 27 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 11 | ENE 11 | ENE 10 | E 10 | ENE 10 | ENE 10 | SSE 7 | — | ENE 8 |
160 | 181 | 139 | 158 | 218 | 188 | 219 | 362 | 356 | 408 | 533 | 1403 | 1906 | 2493 | 1763 | 1513 | 2216 | 168 | — | 462 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 48 | 47 | 47 | 55 | 47 | 48 | 59 | 48 | 55 | 113 | 216 | 216 | 217 | 217 | 218 | 57 | 42 | 5 | 47 | 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.











