
Surf Forecasts:
Sandy Beach surf forecast from 12 Sep 2026:
- Most powerful swell: Thursday 17 Sep, 8PM (local time) - 7.5ft (2.3m), 10s period, ENE swell with 983 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 2.3m 10s and forecast to arrive on Thursday (Sep 17) at 8PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 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 | 8PM (Thu 17th Sep) | 7.5ft (2.3m) 10s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
Alright folks, Rusty here with a long hard look at what Sandy Beach has in store. I gotta be straight with you – this is a tough stretch for paddlers. The whole 16-day window is littered with strong cross-shore winds and messy conditions, and the first real chance of anything worthwhile doesn’t show up until the very end.
We kick off starting Saturday, September 12th right through the middle of the week, and there’s just nothing doing. The swell is small, bumpy, and we’re stuck with a persistent cross-breeze that’s chopping everything up. The combined energy is moderate at best – bouncing around the 120 to 200 mark – but with 12 to 16 mph winds never letting up, the surface is just junk. Even on Sunday morning of the 13th, with a 3-ft NE swell pushing in, the cross-shore wind kills any chance of a clean face.
By Wednesday, September 16th, things start to get some size, but it comes with a penalty. That afternoon, a long-period 18-second SSW groundswell rolls in showing strong energy of 831, but it’s sloppy. The water’s about average for the time of year at 81° – nothing weird there – but the 22 mph cross-wind keeps the waves lumpy and hard to read. Not worth suiting up.
Thursday the 17th and Friday the 18th see the swell really pumping, with heights over 7 ft and combined energy cracking the 1000 mark. That’s strong stuff. But the wind is still ripping between 19 and 25 mph, cross-shore or cross-onshore, and the wave comment says it all: poor. For a beach and reef setup like Sandy Beach, with this much wind and size, my honest call is that this setup looks more interesting for kite surfing than paddle surfing. If you’re a beginner, stay well clear – 7-ft waves with messy wind is expert territory only.
The pattern holds steady through the next week. Size comes and goes, but the ENE trades don’t let up. The closest we get to something rideable is on Wednesday, September 23rd. You’ve got a solid 7-ft swell from the East with a 10-second period, and the wind finally drops to a moderate 12-16 mph. The combined energy is strong at 958. It’s still cross-shore, but the conditions are described as “marginal” rather than poor. That’s your best option in the whole run – the only day that gets a score above zero. It’s not a standout by any stretch, but if you’re desperate for a paddle, that Wednesday might give you a few lumpy, workable runners.
After that, the final weekend of September just fades back into small, windy mush. So, to sum it up: a long, ugly blank run for most of the month, with a single, okay window on the 23rd. Not our finest period.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Sat morning, min 25°C on Sat morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Thu night. Warm (max 26°C on Tue morning, min 25°C on Tue morning). Mainly fresh winds. | ||||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | |||||||||||||||
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 10 | ENE 10 | NNE 9 | NNE 9 | NNE 9 | NE 9 | NE 8 | NE 8 | NE 8 | E 12 | NE 8 | SSW 19 | ENE 6 | SSW 18 | SSW 17 | ENE 8 | ENE 10 | ENE 9 | E 9 | SSW 17 | SSW 16 |
Wave Graph | |||||||||||||||||||||
128 | 98 | 99 | 99 | 99 | 79 | 58 | 171 | 107 | 46 | 133 | 470 | 156 | 541 | 377 | 570 | 923 | 758 | 646 | 580 | 539 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross | cross | cross | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross |
High Tide | 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 | 9:21AM0.54m | 9:37PM0.19m | ||||||||
Low Tide | 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 | 6:28PM0.17m | 2:11AM0.15m | |||||||
6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | |
— | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 3 | 4 | 2 |
Temp °C | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 |
Feels °C | 25 | 24 | 24 | 26 | 24 | 24 | 24 | 23 | 24 | 27 | 25 | 26 | 25 | 24 | 25 | 24 | 24 | 25 | 26 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | ENE 10 | NE 9 | NNE 9 | NNE 9 | NNE 9 | NE 9 | NE 8 | SW 22 | NE 8 | SW 20 | SW 19 | SSW 19 | SW 18 | SSW 18 | SSW 17 | SW 16 | SW 16 | SSW 18 | SSW 17 | SSW 17 | SSW 16 |
128 | 81 | 99 | 99 | 99 | 79 | 58 | 227 | 107 | 392 | 384 | 470 | 455 | 541 | 377 | 258 | 258 | 644 | 622 | 580 | 539 | |
Swell 2 Height (m) Direction Period (s) | NE 8 | ENE 10 | ENE 9 | E 5 | SSW 15 | SW 12 | SW 14 | SW 14 | SW 21 | NNE 8 | E 12 | E 11 | E 10 | SW 11 | SW 11 | SSW 20 | SSW 19 | SE 10 | SSE 10 | SSE 9 | SSE 6 |
74 | 98 | 84 | 17 | 84 | 38 | 49 | 49 | 224 | 36 | 68 | 58 | 50 | 31 | 19 | 149 | 210 | 4 | 9 | 8 | 17 | |
Swell 3 Height (m) Direction Period (s) | SW 15 | SW 16 | SSW 13 | SW 15 | SW 12 | ENE 8 | SW 23 | SSW 11 | SSW 13 | E 12 | SW 12 | SW 12 | SW 12 | SSE 12 | SSE 11 | WSW 8 | SW 10 | W 10 | W 9 | S 21 | S 20 |
242 | 124 | 68 | 107 | 37 | 14 | 86 | 12 | 68 | 46 | 38 | 38 | 35 | 14 | 12 | 7 | 4 | 2 | 2 | 9 | 67 | |
Wind waves Height (m) Direction Period (s) | — | — | ENE 5 | — | ENE 9 | ENE 4 | ENE 5 | NE 8 | ENE 5 | ENE 5 | NE 8 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | ENE 8 | ENE 10 | ENE 9 | E 9 | ENE 9 | ENE 8 |
— | — | 13 | — | 59 | 13 | 33 | 171 | 19 | 40 | 133 | 142 | 156 | 220 | 295 | 570 | 923 | 758 | 646 | 463 | 367 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 16 | 16 | 29 | 16 | 23 | 47 | 16 | 16 | 47 | 47 | 16 | 47 | 110 | 47 | 55 | 110 | 47 | 50 | 5 | 14 |
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.










