Surf Forecasts:
Sandy Beach surf forecast from 18 Aug 2026:
- Best quality surf: Thursday 20 Aug, 8PM (local time) - 2ft (0.6m), 17s period, SSW swell with cross-offshore winds.
- Most powerful swell: Monday 24 Aug, 5PM (local time) - 8ft (2.5m), 8s period, ENE swell with 768 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 8PM (local time) - 2ft (0.6m), 17s period with SSW 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 Thursday (Aug 20) at 8PM. The primary swell is predicted to be 0.6m and 17s period with a secondary swell of 0.8m and 7s. 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 2.5m 8s and forecast to arrive on Monday (Aug 24) at 5PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 16s period and expected on Friday (Aug 21) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Thu 20th Aug) | 2ft (0.6m) 17s |
| Best Surf | 8PM (Thu 20th Aug) | 2ft (0.6m) 17s |
| Most Powerful | 5PM (Mon 24th Aug) | 8ft (2.5m) 8s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down the surf for Sandy Beach. Honestly, the first week is a bust. Those ENE trades are blowing cross-shore at 18 to 22 mph, leaving the surface lumpy and chopped. The swell is tiny and weak, and the reports are all "poor surf conditions." There’s a big gap with no real options from now until late August.
Later on, the swell does pick up, but the wind sticks around. By the 23rd and 24th of August, we’re seeing waves around 6 to 7 ft, with moderate wave energy (612 to 668), but it’s still messy with strong cross-shore winds. Not clean.
The one day that stands out is the 28th of August, Friday. Morning and afternoon, you’ve got a 10 ft swell from the E, with a period of 8-9 seconds. The wave energy gets strong (1617 to 1890). The wind and tide are in your favor. But listen – at 10 ft, this is for experts only. This is a big, powerful swell. For the crew that can handle it, this is your window. Sandy Beach likes that E swell, as its optimum direction is ESE. Water temp is about 80°, which is normal for the season.
After that, the swell fades and the winds stay onshore and messy right through the start of September.
So here’s the deal: if you’ve got the skill and the nerve, the 28th of August is the only real highlight. The rest of the time, the wind and chop are gonna kill it.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Thu morning, min 24°C on Mon night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Fri afternoon, min 24°C on Thu night). Winds increasing (light winds from the SE on Fri morning, strong winds from the ENE by Sun morning). | ||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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 13 | ENE 7 | ENE 7 | ENE 8 | E 8 | E 8 | E 8 | SSW 18 | SSW 17 | NE 7 | E 7 | E 7 | SSW 16 | ENE 6 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph  | |||||||||||||||||||
 kJ | 170 | 165 | 143 | 151 | 109 | 100 | 82 | 207 | 200 | 79 | 51 | 49 | 322 | 153 | 247 | 496 | 350 | 342 | 352 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross | cross | cross-on | cross-off | cross-off | on | cross-on | cross | cross-on | cross | cross | cross | cross | cross |
High Tide | 7:56AM0.52m | 6:10PM0.31m | 9:08AM0.53m | 10:20AM0.55m | 8:45PM0.20m | 11:21AM0.57m | 10:59PM0.20m | 12:10PM0.60m | 00:02AM0.21m | 12:51PM0.62m | 00:45AM0.24m | ||||||||
Low Tide | 00:39AM0.07m | 2:59PM0.27m | 1:14AM0.09m | 2:00AM0.10m | 7:38PM0.20m | 3:06AM0.11m | 7:49PM0.17m | 4:20AM0.10m | 8:09PM0.14m | 5:23AM0.08m | 8:29PM0.12m | ||||||||
 |  | |  |  | | | | | | | | | | | | | | | |
 | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — |
 | 6:59 | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 25 | 25 | 24 | 24 | 25 | 25 | 26 | 26 | 25 | 25 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 25 |
Feels °C | 24 | 23 | 23 | 22 | 24 | 25 | 25 | 27 | 26 | 27 | 29 | 29 | 28 | 25 | 23 | 23 | 22 | 22 | 23 |
Swell 1 Height (m) Direction Period (s) | ENE 7 | S 13 | S 13 | S 13 | E 8 | E 8 | E 8 | E 8 | E 7 | NE 7 | E 7 | SW 16 | SSW 16 | SW 16 | SW 16 | SSW 16 | SW 15 | SSW 15 | SW 14 |
| kJ | 139 | 165 | 119 | 116 | 109 | 84 | 82 | 74 | 70 | 79 | 51 | 261 | 322 | 261 | 255 | 212 | 116 | 144 | 99 |
Swell 2 Height (m) Direction Period (s) | S 13 | SW 17 | SW 18 | SW 18 | NNE 7 | S 12 | SW 16 | NE 6 | SSW 17 | SW 16 | SW 17 | E 7 | WNW 10 | WNW 10 | W 10 | S 14 | S 13 | SSE 13 | SSE 13 |
| kJ | 170 | 74 | 80 | 79 | 30 | 45 | 129 | 32 | 200 | 274 | 291 | 49 | 33 | 33 | 53 | 104 | 90 | 35 | 57 |
Swell 3 Height (m) Direction Period (s) | E 9 | WSW 6 | W 13 | W 12 | SW 16 | SSW 16 | S 12 | SSW 18 | NNE 6 | E 8 | NNE 7 | NE 7 | S 13 | S 12 | S 12 | WNW 12 | SSW 15 | S 11 | ESE 10 |
| kJ | 25 | 3 | 31 | 25 | 129 | 100 | 45 | 207 | 28 | 28 | 30 | 36 | 54 | 47 | 47 | 53 | 76 | 22 | 34 |
Wind waves Height (m) Direction Period (s) | — | ENE 7 | ENE 7 | ENE 8 | — | NE 6 | NE 6 | — | — | — | — | — | ENE 7 | ENE 6 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 7 |
| kJ | — | 154 | 143 | 151 | — | 32 | 30 | — | — | — | — | — | 85 | 153 | 247 | 496 | 350 | 342 | 352 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 47 | 47 | 16 | 16 | 16 | 16 | 16 | 17 | 5 | 0 | 5 | 5 | 16 | 47 | 55 | 55 | 57 | 110 | 55 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Sandy Beach surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest