Surf Forecasts:
Sandy Beach surf forecast from 20 Aug 2026:
- Best quality surf: Thursday 20 Aug, 5PM (local time) - 2ft (0.6m), 17s period, SSW swell with cross-offshore winds.
- Most powerful swell: Sunday 23 Aug, 11AM (local time) - 7.5ft (2.3m), 7s period, ENE swell with 517 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 5PM (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 5PM. 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 2.3m 7s and forecast to arrive on Sunday (Aug 23) at 11AM. 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+) | 5PM (Thu 20th Aug) | 2ft (0.6m) 17s |
| Best Surf | 5PM (Thu 20th Aug) | 2ft (0.6m) 17s |
| Most Powerful | 11AM (Sun 23rd Aug) | 7.5ft (2.3m) 7s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
Alright, let’s get into it. This is a tough stretch for Sandy Beach.
Right off the bat, we’re looking at a blank run with no surf worth paddling out for. The first few days through to the end of August are a mess. We’ve got some long-period swell from the SSW on the 19th and 20th, with a 16 to 18-second period and moderate energy (268 to 331), but the wind is all cross and cross-off and the surf is tiny—only 1ft to 2ft. Not worth wetting your wetsuit for. Then from the 21st through the 28th, things go totally flat or blown out. The swell direction swings around to the ENE with short-period, 7-second wind slop, and the wind is cranking from the ENE at 22 to 28 mph. The combined energy gets up there—up to 683 on the 23rd—but that’s just messy, stormy junk. This stretch is a hard pass.
There’s a real gap with no recommendations until we hit the very end of the forecast window. The first sign of anything remotely rideable shows up on the morning of September 2nd. That morning at Sandy Beach we get an 8ft ENE swell with an 8-second period and very strong combined energy (1064). The wind is light from the NE at 6 mph, which is cross-shore and gives us light cross-shore with small crossing wind ripples. That’s the best wind we’ve seen all outlook. The water temperature is 80°F with no anomaly, so it’s average for the time of year. The crowd here is "often", so expect company. It’s a beach and reef setup, so even though the period is short, there could be a wave. This is the only standout, and it’s a tentative one—it’s at the edge of the forecast range, so keep an eye on it.
For the rest, the winds stay onshore or cross-onshore and the swell stays short-period and lumpy. The run from August 19th to September 1st is a write-off for paddle surfing. If the wind keeps up like this and the swell is short and bumpy, this setup looks more interesting for kite surfing than paddle surfing.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Fri afternoon, min 25°C on Wed afternoon). Winds increasing (calm on Fri morning, fresh winds from the ENE by Sat morning). | Days 5-7 Weather SummarySome drizzle, heaviest during Mon afternoon. Warm (max 26°C on Mon morning, min 25°C on Sat afternoon). Winds decreasing (strong winds from the ENE on Sun morning, moderate winds from the E by Tue morning). | |||||||||||||||||||
Wed 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | ||||||||||||||
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) | E 8 | ENE 7 | SSW 18 | SSW 17 | NE 7 | E 7 | ENE 7 | SSW 16 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
Wave Graph | ||||||||||||||||||||
100 | 143 | 207 | 200 | 65 | 36 | 91 | 322 | 158 | 219 | 394 | 517 | 360 | 432 | 326 | 277 | 333 | 324 | 251 | 196 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross-off | cross | cross-on | cross | cross-on | cross-on | cross | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 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 | 1:56PM0.66m | 1:55AM0.30m | ||||||||
Low Tide | 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 | 6:56AM0.04m | 9:09PM0.10m | ||||||||
— | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | |
6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — |
Temp °C | 26 | 25 | 25 | 26 | 26 | 26 | 27 | 27 | 26 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 27 | 26 |
Feels °C | 25 | 25 | 27 | 28 | 29 | 30 | 28 | 30 | 25 | 22 | 22 | 22 | 21 | 21 | 25 | 25 | 26 | 26 | 28 | 26 |
Swell 1 Height (m) Direction Period (s) | E 8 | ENE 7 | E 8 | ENE 7 | NE 7 | SW 17 | SW 16 | ENE 7 | SW 16 | SW 16 | SSW 16 | S 13 | SSW 15 | SSE 13 | SSW 14 | E 7 | SSW 13 | SSW 12 | ENE 8 | SSW 15 |
84 | 143 | 71 | 131 | 65 | 291 | 264 | 99 | 261 | 255 | 212 | 90 | 144 | 96 | 127 | 277 | 93 | 85 | 251 | 121 | |
Swell 2 Height (m) Direction Period (s) | S 12 | SW 16 | NE 6 | SSW 17 | SW 16 | E 7 | ENE 7 | SSW 16 | W 10 | W 11 | S 14 | SW 15 | SSE 15 | SW 14 | SSE 12 | SSW 13 | SSE 7 | SSW 16 | SSW 16 | SSW 12 |
45 | 129 | 42 | 200 | 274 | 36 | 49 | 322 | 53 | 62 | 106 | 115 | 87 | 100 | 50 | 156 | 30 | 146 | 142 | 81 | |
Swell 3 Height (m) Direction Period (s) | SSW 16 | S 12 | SSW 18 | W 11 | E 8 | NNE 7 | W 11 | W 10 | S 12 | S 12 | WNW 10 | SSW 15 | WNW 10 | SSW 15 | SE 9 | SSE 12 | SSE 12 | SSE 6 | SSW 12 | S 12 |
100 | 45 | 207 | 37 | 28 | 33 | 83 | 51 | 47 | 47 | 35 | 76 | 21 | 71 | 22 | 47 | 45 | 14 | 56 | 71 | |
Wind waves Height (m) Direction Period (s) | NE 6 | NNE 6 | — | — | — | — | ENE 7 | — | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | — | ENE 8 |
39 | 51 | — | — | — | — | 91 | — | 158 | 219 | 394 | 517 | 360 | 432 | 326 | 149 | 333 | 324 | — | 196 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 16 | 16 | 5 | 0 | 5 | 5 | 5 | 5 | 49 | 57 | 57 | 63 | 111 | 111 | 63 | 47 | 47 | 42 | 42 | 20 |
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.











