Surf Forecasts:
Sandy Beach surf forecast from 11 Sep 2026:
- Most powerful swell: Friday 18 Sep, 2AM (local time) - 3.5ft (1.0m), 18s period, SSW swell with 644 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 1.0m 18s and forecast to arrive on Friday (Sep 18) 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 0.9m 18s period and expected on Wednesday (Sep 16) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Fri 18th Sep) | 3.5ft (1.0m) 18s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
Alright crew, Rusty here, giving you the rundown for Sandy Beach in feet and miles per hour.
Let’s be real – this stretch is a bummer. From Friday the 11th all the way to the morning of Monday the 23rd of September, that’s a 12-day stretch with nothing worth paddling for. The wind is almost always cross or cross-on from the ENE or NE, and it’s howling at 15 to 25 mph, sometimes stronger. The surface is chopped up and lumpy, no good.
Swell heights run from 2 ft to 5 ft, but the period is short, mostly 6 to 11 seconds, so the waves have no power. The combined energy is weak to moderate, with numbers like 91 up to 337 – not enough to get excited about. Water temp is 81°, which is dead average for this time of year.
On Monday the 23rd of September, the afternoon edges up to “marginal.” You get a 7 ft swell from the ENE, 9-second period, with a lighter cross wind from the NE at 15 mph. Still not clean, but the energy jumps to 834 – that’s moderate to strong. An intermediate surfer might find something rideable.
Thursday the 24th of September also shows marginal. Swell around 6-7 ft from the ENE, period 8-9 seconds, with a light S to SSE wind at 9 mph – cross-on. Energy stays strong, around 843 to 901. Not perfect, but you could scratch a few.
No true standouts here. No glassy offshore days, no long-period groundswell. The wind is the problem every day. If you’ve got a kite, the strong cross winds and lumpy water might be your thing. For surfing? Leave the board at home.
The long-range stuff is always a bit iffy, but right now it’s a long dry spell.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Fri afternoon, min 24°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Tue morning, min 25°C on Mon morning). Mainly strong winds. | ||||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | |||||||||||||||
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 11 | E 11 | ENE 10 | ENE 10 | ENE 10 | NNE 9 | NE 9 | NNE 9 | NE 9 | NE 8 | NE 8 | SSW 13 | NE 8 | NE 8 | SSW 19 | ENE 6 | SSW 18 | ENE 7 | ENE 8 | ENE 9 | SSW 18 |
Wave Graph  | |||||||||||||||||||||
 kJ | 128 | 286 | 245 | 169 | 98 | 99 | 115 | 99 | 77 | 74 | 129 | 68 | 84 | 108 | 470 | 183 | 541 | 340 | 614 | 603 | 644 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on |
High Tide | 3:13PM0.59m | 3:51AM0.55m | 3:42PM0.51m | 4:32AM0.57m | 4:10PM0.44m | 5:15AM0.59m | 4:37PM0.37m | 6:02AM0.58m | 5:04PM0.30m | 6:56AM0.56m | 5:30PM0.25m | 8:04AM0.54m | 6:18PM0.21m | ||||||||
Low Tide | 9:14AM0.08m | 9:49PM0.03m | 10:05AM0.12m | 10:11PM0.04m | 10:58AM0.16m | 10:34PM0.05m | 11:57AM0.20m | 10:58PM0.06m | 1:10PM0.23m | 11:24PM0.09m | 2:59PM0.23m | 11:56PM0.11m | 5:49PM0.21m | 00:44AM0.14m | |||||||
 | |  | | | | | |  | | | |  | | | | | | | | | |
 | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — |
 | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 |
Feels °C | 23 | 25 | 25 | 24 | 24 | 25 | 24 | 24 | 25 | 24 | 23 | 24 | 26 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 24 |
Swell 1 Height (m) Direction Period (s) | ENE 7 | E 11 | ENE 10 | ENE 10 | NE 9 | NNE 9 | NE 9 | NNE 9 | NE 9 | NE 8 | SW 22 | NNE 8 | SW 20 | SW 19 | SSW 19 | SW 18 | SSW 18 | SW 17 | SW 16 | SW 16 | SSW 18 |
| kJ | 99 | 286 | 245 | 169 | 81 | 99 | 115 | 99 | 77 | 74 | 227 | 44 | 392 | 384 | 470 | 455 | 541 | 429 | 258 | 258 | 644 |
Swell 2 Height (m) Direction Period (s) | ENE 11 | SW 15 | SW 15 | NE 8 | ENE 10 | ENE 9 | SW 15 | SSW 15 | SW 12 | SW 14 | SW 14 | SW 21 | NNE 8 | E 11 | NNE 8 | SW 12 | SW 11 | E 10 | SSW 20 | SSW 19 | SSE 10 |
| kJ | 128 | 229 | 226 | 74 | 98 | 84 | 107 | 84 | 38 | 49 | 49 | 224 | 21 | 41 | 50 | 35 | 31 | 94 | 149 | 210 | 9 |
Swell 3 Height (m) Direction Period (s) | SW 16 | NNE 8 | SSE 6 | SW 15 | SW 16 | SSW 13 | ENE 9 | ENE 9 | ENE 8 | SW 23 | SSW 11 | SSW 13 | SW 13 | SW 12 | E 11 | WSW 8 | WSW 10 | SW 11 | SSW 11 | SSE 10 | W 10 |
| kJ | 261 | 51 | 10 | 242 | 124 | 68 | 26 | 25 | 14 | 86 | 12 | 68 | 42 | 38 | 58 | 6 | 9 | 19 | 11 | 10 | 7 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | E 5 | ENE 4 | NE 5 | ENE 5 | NE 8 | ENE 5 | NE 8 | NE 8 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 9 | ENE 9 |
| kJ | — | — | — | — | — | — | 24 | 11 | 25 | 17 | 129 | 38 | 84 | 108 | 42 | 183 | 265 | 340 | 614 | 603 | 534 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 47 | 16 | 16 | 16 | 16 | 16 | 47 | 16 | 23 | 19 | 16 | 16 | 16 | 47 | 47 | 55 | 57 | 48 | 55 | 55 | 55 |
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.
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