
Surf Forecasts:
Sandy Beach surf forecast from 9 Aug 2026:
- Most powerful swell: Saturday 15 Aug, 11PM (local time) - 10ft (3.0m), 13s period, E swell with 3,102 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 3.0m 13s and forecast to arrive on Saturday (Aug 15) at 11PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 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 | 11PM (Sat 15th Aug) | 10ft (3.0m) 13s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
Alright, let’s get into it. The next week and a half is a real mixed bag for Sandy Beach. For the most part, we’re looking at tricky, cross-shore winds messing up what would otherwise be decent waves. The water’s sitting at 80°, which is pretty much spot on for this time of year, so no surprises there.
The first few days, from Sunday the 9th through Tuesday the 11th, are going to be a write-off. We’ve got chest-high, short-period windswell hanging around 5ft to 5ft, but the ENE breeze is blowing straight across the beach, making everything lumpy and chopped out. It’s just not worth paddling out for that mess. The energy is weak to moderate, around 425 to 570, and the period is a short 7 to 8 seconds, so it’s all surface chop with no push.
Then, from Wednesday the 12th into Friday the 14th, the swell drops right off but the period starts to climb. We’re seeing 3ft to 4ft of south swell with periods jumping to 14-18 seconds. That’s proper groundswell energy, but it’s still tiny and the wind is still a fresh cross-shore, so it’s going to be hard work for not much reward. The energy is moderate, in the 750-900 range, but those long-period waves are going to be few and far between.
The surf starts to build again on Saturday the 15th, with the swell climbing to 8ft in the morning and 8ft by the afternoon. That ENE swell is back, but the period is only 11 seconds, and the wind is up to 25 mph in the afternoon, making it a total mess. The energy is getting stronger, hitting 2145, but it’s all for nothing with that cross-chop.
Now, Sunday the 16th is the standout. The swell pushes up to a solid 10ft, with a longer 13-second period from the ENE. The wind swings around to a cross-offshore from the NNE, and the wave comment says it’s clean. This is the day to be out there. The energy is cranking at 4938, which is strong to very strong. It’s still going to be big and powerful, so this is for the intermediate crew and above. Beginners should give this one a miss. The break is exposed, and with that size and power, it’s not the place to learn.
After that, things get messy again. Monday the 17th sees the swell drop to 8ft but the wind swings onshore from the SW, and the period backs off to 10 seconds. It’s getting lumpy again with a risk of thunderstorms. Tuesday the 18th is tiny, just 2ft, and the wind is light but the swell is gone. The rest of that week is a mix of small, short-period windswell and onshore breezes, with no real quality on offer.
There’s a pulse of ENE swell coming back around Sunday the 23rd, with 10ft on the cards, but the period is short at 8 seconds, and the wind is cross-shore again. It’s going to be a wall of white water, more interesting for the kite surfers than for us paddle surfers, to be honest.
So, overall, the best bet in this whole window is definitely Sunday the 16th. It’s the only day where the size, period, and wind all come together for a clean, powerful session. It’s a long way out, so keep an eye on it, but that’s the one to circle on the calendar. It’s a long stretch of average to poor conditions before that, but this spot is very consistent, so it won’t stay flat for long.
Rusty
Short Range ForecastMostly dry. Warm (max 26°C on Mon morning, min 25°C on Sun morning). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Wed night, min 25°C on Wed morning). Mainly strong winds. | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | |||||||||||||||
AM | 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 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | 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 | ENE 11 | ENE 11 | E 13 |
Wave Graph | |||||||||||||||||||||
225 | 280 | 292 | 240 | 266 | 231 | 203 | 269 | 276 | 509 | 498 | 890 | 501 | 653 | 537 | 411 | 445 | 618 | 1230 | 1615 | 3102 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 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 | 5:04AM0.45m | 4:53PM0.55m | ||||||||
Low Tide | 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 | 10:54AM0.13m | 11:44PM0.05m | ||||||||
6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | |
— | 7:05 | — | — | 7:04 | — | — | 7:02 | — | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 26 | 26 | 26 | 25 | 25 | 25 | 26 | 26 | 26 | 25 |
Feels °C | 24 | 23 | 24 | 26 | 24 | 25 | 25 | 24 | 22 | 23 | 22 | 24 | 24 | 23 | 22 | 22 | 22 | 24 | 24 | 23 | 22 |
Swell 1 Height (m) Direction Period (s) | 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 | S 13 | E 14 | E 13 |
186 | 86 | 223 | 184 | 176 | 186 | 165 | 269 | 243 | 509 | 498 | 890 | 501 | 653 | 537 | 411 | 411 | 306 | 280 | 311 | 3102 | |
Swell 2 Height (m) Direction Period (s) | SSW 13 | SSW 16 | SSW 12 | SSW 12 | SSW 11 | SSW 11 | SSW 11 | SSE 9 | S 20 | SSW 13 | SSW 13 | W 12 | SSW 12 | W 12 | W 11 | W 12 | W 12 | W 11 | W 11 | S 13 | S 13 |
96 | 102 | 56 | 56 | 42 | 23 | 41 | 16 | 276 | 218 | 218 | 25 | 150 | 11 | 10 | 11 | 11 | 21 | 21 | 219 | 219 | |
Swell 3 Height (m) Direction Period (s) | SSE 10 | SSW 18 | SSE 10 | SSE 10 | SSE 10 | SSE 9 | SSE 9 | S 21 | W 10 | W 13 | W 12 | SE 9 | W 12 | SW 19 | SW 18 | SW 18 | SSW 18 | SSW 17 | E 17 | W 12 | S 18 |
19 | 102 | 18 | 19 | 18 | 16 | 16 | 79 | 8 | 30 | 25 | 3 | 11 | 14 | 13 | 12 | 30 | 29 | 22 | 27 | 99 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | E 7 | ENE 7 | ENE 7 | E 6 | E 6 | ENE 6 | E 7 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 11 | ENE 11 | ENE 13 |
225 | 280 | 292 | 240 | 266 | 231 | 203 | 188 | 206 | 182 | 188 | 255 | 194 | 226 | 293 | 340 | 445 | 618 | 1230 | 1615 | 1572 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 48 | 48 | 48 | 48 | 48 | 48 | 48 | 48 | 48 | 48 | 57 | 48 | 49 | 110 | 48 | 55 | 110 | 48 | 110 | 150 | 14 |
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 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.











