Surf Forecasts:
Sandy Beach surf forecast from 7 Sep 2026:
- Most powerful swell: Tuesday 8 Sep, 2AM (local time) - 13ft (4.0m), 13s period, SSW swell with 5,172 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 4.0m 13s and forecast to arrive on Tuesday (Sep 08) at 2AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 14s period and expected on Monday (Sep 07) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Tue 8th Sep) | 13ft (4.0m) 13s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
Alright, Rusty here again, but in feet.
Let’s be straight – the first stretch at Sandy Beach is rough. Plenty of swell energy kicking around, but the trade winds are howling out of the east-northeast at 18-19 mph, blowing onshore or sideways, making it lumpy and choppy. The water temp sits at about 81°F, which is about average for this spot this time of year.
We’re looking at near-constant onshore and cross-shore conditions through the first week, with a mix of thunderstorms and rain showers. Not a pretty picture. Swell heights are in the 4 to 6 ft range at times, but with that wind it’s just a mess. You’d be fighting a losing battle.
The window you want is the weekend of September 19th and 20th. After a long dry spell, the wind finally goes glassy – dead calm on Saturday morning the 19th, with a clean 3 ft groundswell out of the south-southwest, period a solid 15 seconds. Sunday the 20th is the same story: glassy, clean, and a consistent 3 ft to 3 ft. The wave energy is moderate, but the quality will be night and day better than anything else in this whole forecast. It’s small but polished. That long period will bring some nice lines, but with longer lulls between sets. Crowds might show up.
Outside of that, you’ve got a few days of tiny, choppy junk and a bump of long period energy midweek that gets ruined by the wind again. Not much else to say.
If you’re surfing, the call is clear: save your energy for Saturday and Sunday, September 19th-20th. That’s the only pocket of glassy, clean surf in the whole run.
- Rusty
Short Range ForecastHeavy rain (total 35mm), heaviest during Sun night. Warm (max 27°C on Mon afternoon, min 24°C on Sun night). Winds decreasing (strong winds from the SSE on Mon night, light winds from the SE by Tue night). | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Wed afternoon, min 25°C on Wed night). Winds decreasing (fresh winds from the ENE on Thu morning, light winds from the ESE by Sat morning). | |||||||||||||||||||
Sun 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | ||||||||||||||
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 12 | ENE 12 | ENE 12 | ENE 12 | SSW 13 | S 10 | ENE 11 | ENE 10 | SSW 14 | SSW 13 | SSW 13 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 1064 | 1338 | 1703 | 1461 | 5172 | 861 | 638 | 356 | 269 | 257 | 203 | 231 | 203 | 173 | 151 | 308 | 379 | 255 | 209 | 135 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on |
High Tide | 00:14AM0.26m | 12:48PM0.73m | 1:03AM0.31m | 1:30PM0.72m | 1:48AM0.38m | 2:07PM0.69m | 2:29AM0.44m | 2:41PM0.65m | 3:11AM0.50m | 3:13PM0.59m | 3:51AM0.55m | 3:42PM0.51m | 4:32AM0.57m | |||||||
Low Tide | 7:41PM0.09m | 5:40AM0.04m | 8:09PM0.07m | 6:40AM0.03m | 8:36PM0.05m | 7:34AM0.03m | 9:01PM0.04m | 8:25AM0.05m | 9:26PM0.04m | 9:14AM0.08m | 9:49PM0.03m | 10:05AM0.12m | 10:11PM0.04m | |||||||
 |  | | | |  |  |  | |  |  | | | | | | | | | | |
 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | 6:42 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — |
mm | 3 | 14 | 5 | 3 | 8 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 25 | 26 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 26 | 25 | 25 | 25 | 26 | 25 | 26 | 26 | 26 |
Feels °C | 26 | 24 | 25 | 28 | 27 | 25 | 27 | 30 | 31 | 29 | 27 | 24 | 23 | 23 | 23 | 24 | 23 | 29 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | ENE 12 | ENE 12 | SW 12 | ENE 12 | SSW 13 | ENE 11 | SSW 8 | ENE 10 | ENE 9 | ENE 8 | SSW 13 | E 12 | E 12 | SW 16 | ENE 7 | ENE 11 | ENE 11 | SW 15 | ENE 10 | ENE 10 |
| kJ | 1064 | 1338 | 497 | 1461 | 4001 | 785 | 380 | 339 | 186 | 176 | 195 | 141 | 101 | 214 | 151 | 308 | 379 | 242 | 209 | 135 |
Swell 2 Height (m) Direction Period (s) | SSW 12 | SSW 14 | SSW 17 | SW 12 | ENE 12 | WSW 10 | ENE 11 | SSW 8 | SSW 14 | SSW 13 | E 13 | SSW 13 | SSW 13 | E 11 | SW 16 | SW 15 | SW 15 | NNE 8 | NNE 9 | NE 9 |
| kJ | 517 | 1048 | 498 | 678 | 1211 | 586 | 638 | 123 | 269 | 257 | 156 | 131 | 93 | 91 | 206 | 229 | 226 | 45 | 49 | 75 |
Swell 3 Height (m) Direction Period (s) | S 19 | S 18 | SSE 7 | SSW 16 | SSW 15 | SSW 15 | W 9 | SSW 14 | E 13 | E 13 | S 7 | SW 16 | SW 18 | SW 11 | E 11 | NNE 8 | SW 9 | SW 8 | SSW 16 | SSW 13 |
| kJ | 180 | 243 | 69 | 582 | 581 | 468 | 220 | 356 | 219 | 166 | 24 | 133 | 155 | 71 | 89 | 50 | 27 | 11 | 99 | 68 |
Wind waves Height (m) Direction Period (s) | — | — | ENE 12 | ENE 7 | SSW 13 | S 10 | — | — | — | — | ENE 7 | ENE 7 | ENE 7 | ENE 7 | — | — | — | ENE 10 | — | — |
| kJ | — | — | 1703 | 172 | 5172 | 861 | — | — | — | — | 203 | 231 | 203 | 173 | — | — | — | 255 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 55 | 5 | 132 | 42 | 62 | 110 | 5 | 3 | 5 | 5 | 16 | 47 | 16 | 18 | 47 | 47 | 16 | 5 | 5 | 5 |
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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