Surf Forecasts:
Sandy Beach surf forecast from 9 Aug 2026:
- Most powerful swell: Sunday 16 Aug, 2AM (local time) - 8ft (2.4m), 11s period, ENE swell with 1,316 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 2.4m 11s and forecast to arrive on Sunday (Aug 16) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 12s period and expected on Thursday (Aug 13) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Sun 16th Aug) | 8ft (2.4m) 11s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
Alright, Rusty here. Grab a coffee, because we've got a long stretch ahead and it ain't all pretty. Let's break down Sandy Beach.
First up, the pattern for the next couple of weeks is pretty grim. We're looking at persistent cross-shore winds, mostly from the ENE and NE, blowing in the 18 to 22 mph range. That's a fresh breeze and it's going to keep the ocean lumpy and messy for days. Combined wave energy is moderate to strong early on, but the conditions are just not letting it clean up. The water temp is about average for this time of year.
The first real hint of something decent doesn't show up until Saturday the 15th of August. That morning, the swell bumps up to 7 ft from the ENE, and the combined energy jumps. But the wind is still a messy cross-shore, making it a marginal call.
The standout window is Sunday the 16th of August. The morning is still a little dicey with a cross-off wind, but the swell is a solid 7 ft from the ENE with a period of 11 seconds and strong energy. But the real magic happens Sunday afternoon. The wind swings to the NW at 9 mph, turning offshore and clean. Swell jumps to 8 ft from the ENE, with a period of 13 seconds. The energy is very strong. That's as good as it gets – excellent surf for experienced surfers, clean faces, and a proper groundswell. Keep in mind, at 8 ft, this is for the experienced crew only; it'll be too much for beginners.
Monday the 17th of August sees the wind shift to the south, bringing a cross-on breeze and choppy conditions as the swell drops back to 7 ft. Not the best follow-up.
After that, it's mostly a write-off. From Tuesday the 18th through to the end of the forecast on the 24th of August, the swell drops off into the 2 ft to 5 ft range, and the wind stays onshore or cross-shore, strong, and messy. The energy drops back to low-to-moderate levels. It’s a long gap of poor conditions.
So, to sum it up: for the next two weeks, your one true standout is Sunday the 16th of August, afternoon session. That’s the only time where the stars align for clean, solid surf. Everything else is a fight with the wind.
Stay patient, and keep an eye on that Sunday.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Mon morning, min 25°C on Sat night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Thu morning, min 25°C on Tue night). Mainly fresh winds. | ||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | ||||||||||||||
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 | ENE 7 | ENE 8 | ENE 7 | ENE 8 | ENE 7 | E 7 | ENE 7 | SSW 14 | S 20 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | ENE 8 | ENE 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 187 | 254 | 276 | 286 | 226 | 228 | 238 | 219 | 269 | 276 | 509 | 498 | 890 | 734 | 653 | 537 | 496 | 405 | 498 |
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-on | cross | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 00:00AM0.20m | 1:10PM0.77m | 1:01AM0.23m | 1:55PM0.79m | 1:52AM0.27m | 2:36PM0.79m | 2:40AM0.31m | 3:14PM0.76m | 3:27AM0.36m | 3:49PM0.71m | 4:15AM0.41m | 4:22PM0.64m | |||||||
Low Tide | 8:16PM0.11m | 5:38AM-0.02m | 8:50PM0.08m | 6:37AM-0.03m | 9:21PM0.06m | 7:31AM-0.04m | 9:52PM0.05m | 8:22AM-0.02m | 10:21PM0.04m | 9:11AM0.01m | 10:50PM0.04m | 10:01AM0.07m | 11:17PM0.04m | ||||||
 |  |  |  | | | | | | | | | | | | | | | | |
 | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — |
 | 7:05 | — | 7:05 | — | — | 7:04 | — | — | 7:02 | — | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 25 | 25 | 25 |
Feels °C | 23 | 24 | 23 | 24 | 26 | 24 | 25 | 24 | 24 | 22 | 23 | 22 | 22 | 23 | 23 | 24 | 22 | 22 | 22 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | SSW 17 | SSW 12 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | S 14 | S 14 |
| kJ | 99 | 186 | 86 | 223 | 184 | 176 | 186 | 165 | 269 | 243 | 509 | 498 | 890 | 734 | 653 | 537 | 496 | 405 | 302 |
Swell 2 Height (m) Direction Period (s) | SW 18 | SSW 13 | SSW 16 | SSW 12 | SSW 12 | SSW 11 | SSW 11 | SSW 11 | SSE 9 | S 20 | SSW 13 | SSW 13 | W 12 | W 12 | W 12 | W 11 | W 12 | W 12 | W 11 |
| kJ | 150 | 96 | 102 | 56 | 56 | 42 | 23 | 40 | 16 | 276 | 218 | 218 | 25 | 11 | 11 | 10 | 11 | 11 | 21 |
Swell 3 Height (m) Direction Period (s) | NE 9 | SSE 10 | SSW 18 | SSE 10 | SSE 10 | SE 10 | SSE 9 | SSE 9 | S 21 | SSE 9 | W 13 | W 12 | SE 9 | SE 9 | SW 19 | SW 18 | SW 18 | SSW 18 | E 14 |
| kJ | 14 | 19 | 102 | 19 | 19 | 23 | 17 | 16 | 79 | 7 | 30 | 25 | 3 | 3 | 14 | 13 | 12 | 30 | 14 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 8 | ENE 7 | ENE 8 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 8 |
| kJ | 187 | 254 | 276 | 286 | 226 | 228 | 238 | 219 | 188 | 155 | 165 | 170 | 182 | 226 | 269 | 293 | 376 | 378 | 498 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 47 | 47 | 47 | 47 | 47 | 48 | 20 | 47 | 47 | 20 | 48 | 55 | 47 | 59 | 61 | 47 | 59 | 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.
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