
Surf Forecasts:
Sandy Beach surf forecast from 9 Aug 2026:
- Best quality surf: Saturday 15 Aug, 8PM (local time) - 13ft (4.0m), 9s period, ENE swell with cross-offshore winds.
- Most powerful swell: Saturday 15 Aug, 8PM (local time) - 13ft (4.0m), 9s period, ENE swell with 2,601 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 8PM (local time) - 13ft (4.0m), 9s 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 Saturday (Aug 15) at 8PM. The primary swell is predicted to be 4.0m and 9s period with a secondary swell of 1.2m and 15s. Another secondary swell of 0.7m and 13s is also forecast. 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 4.0m 9s and forecast to arrive on Saturday (Aug 15) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 18s period and expected on Saturday (Aug 08) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Sat 15th Aug) | 13ft (4.0m) 9s |
| Best Surf | 8PM (Sat 15th Aug) | 13ft (4.0m) 9s |
| Most Powerful | 8PM (Sat 15th Aug) | 13ft (4.0m) 9s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
Alright, Rusty here. Let me be straight with you – this 16-day window for Sandy Beach is a tough one. The forecast is pretty much a write-off for most of it, with a lot of wind and messy conditions. But there is one very specific moment that might just save the whole stretch, if you're brave enough to be there.
We start off with nothing for the first few days. The first real swell we see is through the weekend, but it's a no-go. Saturday the 8th and Sunday the 9th have some waist-high ENE swell, but it's getting flogged by a fresh cross-breeze. The water here is a very warm 80° and the anomaly is only 0.5°, so that's about bang on average for this time of year.
Through the middle of the week, from the 10th to the 13th, the swell direction shifts and the period picks up—we see some long-period groundswell from the S and SSW, with periods hitting 16-18 seconds. But the energy is all over the place, and the wind is relentless from the ENE and NE. It’s a lot of energy, but it's all cross-shore chop. It's a mess. The swell is too short and the wind is too strong to make anything of it at this beach-and-reef spot.
Now, the real kicker comes on the weekend of the 14th and 15th. The swell gets big. We’re talking about 8 ft to 12 ft from the ENE with a period of 8-9 seconds. That’s a lot of water moving, with a ton of energy. But the wind is a strong breeze from the NE, creating a messy, lumpy cross-chop. This is not surfer territory. This is the kind of setup that looks more interesting for kite surfing than paddle surfing. It’s too big and clean for beginners, and too messy for experts.
The Standout Window
The one true standout in this whole 16-day window is a tiny window on Sunday, August 16th, in the morning. The guidance says Sandy Beach is an intermediate spot, fairly consistent, and exposed to ESE swell, with the optimum from the ESE. On that morning, we have a big 12 ft swell from the E, but with a period of 9 seconds, and the energy is absolutely cranking. The wind state is the key: it's a cross-offshore breeze from the N, which is clean. The comment says "wind and tide favorable, but the swell is predicted to be too big for this break." That’s the truth. For an intermediate, this is a no-go—it’s strictly expert territory. The waves will be big and powerful, and the long period groundswell makes it prone to breaking straight on a beach break, so it's best for a reef or point, but that’s the only chance you’ve got. The crowds are often here, so expect a few other brave souls. But honestly, this is the only real, clean surf on offer. After that, the week of the 17th onward drops back to nothing but messy, wind-affected junk.
So, to sum it up: a long, dry gap until the 16th, and then a short, dicey window for experts only. If you’re not an expert, keep your board in the car.
- Rusty
Short Range ForecastMostly dry. Warm (max 26°C on Sat afternoon, min 25°C on Sat night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Tue afternoon, min 25°C on Tue afternoon). Mainly strong winds. | |||||||||||||||||||
Sat 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | ||||||||||||||
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 6 | E 7 | ENE 7 | ENE 8 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 7 | SSW 14 | S 20 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | ENE 8 | ENE 8 | E 8 |
Wave Graph | ||||||||||||||||||||
146 | 100 | 225 | 288 | 278 | 251 | 259 | 208 | 208 | 269 | 276 | 509 | 498 | 890 | 734 | 662 | 537 | 675 | 960 | 1379 | |
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-on | 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 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 25 | 26 | 26 |
Feels °C | 24 | 23 | 23 | 24 | 24 | 25 | 24 | 25 | 24 | 24 | 22 | 22 | 23 | 23 | 23 | 23 | 23 | 21 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | E 7 | SSW 17 | SSW 12 | SSW 16 | SSW 15 | SSW 16 | 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 |
101 | 89 | 159 | 86 | 223 | 184 | 191 | 186 | 165 | 269 | 243 | 509 | 498 | 890 | 734 | 662 | 537 | 411 | 333 | 239 | |
Swell 2 Height (m) Direction Period (s) | SW 18 | SSW 13 | 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 | E 13 | W 12 | W 11 |
154 | 99 | 96 | 102 | 56 | 56 | 49 | 23 | 40 | 16 | 276 | 222 | 218 | 11 | 11 | 11 | 10 | 31 | 11 | 9 | |
Swell 3 Height (m) Direction Period (s) | SSE 10 | SW 18 | SSE 10 | SSW 18 | W 11 | SSE 10 | SSE 10 | SSE 9 | SSE 9 | S 21 | SSE 8 | W 13 | W 12 | S 20 | SE 10 | SW 19 | SW 18 | W 12 | SSW 18 | SSE 15 |
19 | 150 | 19 | 102 | 20 | 19 | 18 | 17 | 16 | 79 | 7 | 30 | 25 | 8 | 4 | 14 | 13 | 11 | 30 | 22 | |
Wind waves Height (m) Direction Period (s) | ENE 6 | NE 7 | ENE 7 | ENE 8 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | E 8 |
146 | 100 | 225 | 288 | 278 | 251 | 259 | 208 | 208 | 188 | 194 | 165 | 188 | 335 | 350 | 360 | 345 | 675 | 960 | 1379 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 55 | 47 | 47 | 55 | 47 | 47 | 47 | 47 | 47 | 48 | 47 | 47 | 55 | 47 | 55 | 59 | 48 | 59 | 111 | 59 |
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.











