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: Tuesday 25 Aug, 2AM (local time) - 8ft (2.4m), 8s period, ENE swell with 678 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 1.1m 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 2.4m 8s and forecast to arrive on Tuesday (Aug 25) at 2AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 6s period and expected on Thursday (Aug 20) 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 | 2AM (Tue 25th Aug) | 8ft (2.4m) 8s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
Alright, looking at Sandy Beach. It’s a beach and reef setup, fairly consistent, but the first week is a total bust. Water temp’s about 80°F, right around average for this time of year.
There’s a long dry spell before anything worth talking about shows up. From Tuesday the 18th of August all the way through the end of the month, the surf is just poor. Cross-shore winds, lumpy chop, no joy. The combined energy stays weak to moderate (like 64 to 406), and even when the swell hits 6 ft on Saturday the 22nd, it’s messy with a 25 mph cross-breeze. Not happening.
The real promise lands on the very last day of the forecast. Wednesday the 2nd of September – that’s your window. The morning is still iffy with a 6 ft SSW groundswell at 11 seconds, but the wind goes light and cross-on. The afternoon is the standout. It goes glassy – flat calm wind from the ESE at just 3 mph, swell 7 ft from the E at 8 seconds. The combined energy jumps to 1263, which is strong, and the report calls it excellent for experienced surfers. That’s big surf – over 5 ft – so leave it for the intermediates and experts.
Also keep an eye on the 30th and 31st of August. The swell gets huge – 10 ft to 12 ft from the E with 9-second periods and massive energy (1819 to 1969). But the wind is still cross and lumpy, and the report says it’s too big for this break. That’s a lot of groundswell pounding a beach and reef setup – could be a beast. Only for the hardy.
So, your best bet? That glassy Wednesday the 2nd of September afternoon. Clean, strong, and all yours. Just know what you’re getting into.
Rusty
Short Range ForecastMostly dry. Warm (max 26°C on Thu afternoon, min 24°C on Tue night). Winds decreasing (fresh winds from the ENE on Tue morning, light winds from the NNE by Thu night). | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Fri afternoon, min 25°C on Fri morning). Winds increasing (calm on Fri morning, strong winds from the ENE by Sun morning). | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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 | E 8 | ENE 8 | E 8 | E 8 | E 8 | SSW 18 | SSW 17 | NE 7 | ENE 7 | ENE 7 | SSW 16 | ENE 6 | ENE 6 | E 7 | E 7 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 165 | 120 | 155 | 86 | 100 | 102 | 207 | 200 | 82 | 67 | 96 | 322 | 107 | 226 | 428 | 569 | 439 | 350 | 435 | 456 | 678 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross | cross | cross-off | on | cross-on | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross-on |
High Tide | 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 | 1:26PM0.65m | 1:20AM0.27m | |||||||||
Low Tide | 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 | 6:13AM0.06m | 8:49PM0.11m | |||||||||
 | |  |  | | | | | | | | | | | | | |  | | | | |
 | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — |
 | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 27 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
Feels °C | 23 | 22 | 23 | 25 | 24 | 25 | 26 | 28 | 29 | 30 | 29 | 27 | 26 | 24 | 23 | 22 | 22 | 22 | 22 | 22 | 23 |
Swell 1 Height (m) Direction Period (s) | S 13 | E 8 | S 13 | E 8 | E 8 | E 8 | E 8 | ENE 7 | NE 7 | ENE 7 | ENE 7 | SSW 16 | SW 16 | SW 16 | SSW 16 | SSE 13 | SSW 15 | SSE 13 | SSE 12 | SSE 11 | SSE 10 |
| kJ | 165 | 120 | 116 | 86 | 84 | 102 | 72 | 134 | 82 | 67 | 96 | 322 | 261 | 255 | 212 | 99 | 144 | 139 | 169 | 148 | 77 |
Swell 2 Height (m) Direction Period (s) | SW 17 | S 13 | SW 18 | SW 16 | S 12 | SW 16 | SSW 18 | SSW 17 | SW 16 | SW 17 | SW 16 | WNW 10 | E 8 | WNW 10 | S 14 | SW 15 | SE 13 | SE 11 | SSW 14 | SSW 13 | SSW 13 |
| kJ | 74 | 119 | 79 | 129 | 45 | 129 | 207 | 200 | 274 | 291 | 261 | 32 | 33 | 35 | 104 | 116 | 88 | 61 | 127 | 102 | 127 |
Swell 3 Height (m) Direction Period (s) | E 9 | SW 18 | W 12 | S 12 | SSW 16 | S 12 | S 11 | S 11 | E 8 | NNE 6 | W 10 | S 13 | WNW 10 | S 12 | WNW 11 | SSW 15 | WNW 11 | SW 14 | SSW 18 | SSW 18 | SSW 17 |
| kJ | 15 | 80 | 25 | 44 | 100 | 45 | 23 | 21 | 31 | 28 | 51 | 54 | 34 | 47 | 40 | 76 | 12 | 100 | 31 | 31 | 55 |
Wind waves Height (m) Direction Period (s) | ENE 7 | NNE 7 | ENE 8 | NE 6 | NNE 6 | NE 6 | NNE 6 | — | — | — | — | ENE 7 | ENE 6 | ENE 6 | E 7 | E 7 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 |
| kJ | 163 | 34 | 155 | 43 | 26 | 34 | 26 | — | — | — | — | 102 | 107 | 226 | 428 | 569 | 439 | 350 | 435 | 456 | 678 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 47 | 16 | 16 | 16 | 16 | 16 | 23 | 5 | 5 | 5 | 5 | 42 | 48 | 55 | 55 | 57 | 59 | 48 | 55 | 55 | 48 |
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