Surf Forecasts:
Sandy Beach surf forecast from 17 Jul 2026:
- Most powerful swell: Thursday 23 Jul, 11PM (local time) - 3ft (0.9m), 19s period, SSW swell with 560 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 0.9m 19s and forecast to arrive on Thursday (Jul 23) at 11PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 14s period and expected on Friday (Jul 17) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11PM (Thu 23rd Jul) | 3ft (0.9m) 19s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
Alright, let’s get into it. The 16-day window for Sandy Beach is a tough one. The first week is basically a write-off with poor surf conditions and lumpy cross-chop from a persistent ENE breeze. There’s a long gap of roughly 10 days with no proper surf on offer before things start to look a little more promising. The water temperature sits at 80°F, which is about average for this time of year, so no surprises there.
The first real glimmer of hope shows up on the morning of 26 July. We’ve got a building swell sneaking in from the east at 4ft, with a period of 17 seconds. That’s proper groundswell. The combined swell energy is 2095, which is strong. The wind is still cross-shore from the ENE at 22 mph, so it’s not perfect, but it’s no longer a total mess. The morning of 27 July gets a bit more size—6ft east swell at 16 seconds—and the wind drops to 16 mph. Still cross-shore, but manageable. The combined energy jumps to 2288. This is the standout window. The east swell direction is a good match for Sandy Beach’s optimum ESE exposure, and the long period means the waves will have shape, though at a beach break setup like this, that long period can make them a bit straight. Still, it’s the best we’ve got.
The morning of 28 July has the biggest swell of the whole run: 7ft from the east, 14 seconds, combined energy 2334. That’s getting into expert territory—definitely too big for beginners. The wind is lighter from the NE at 12 mph, cross-shore, which is a plus. If you’re experienced and hungry, that’s your call. The afternoon drops a bit to 7ft, but the energy stays high.
After that, the swell slowly fades through the end of July and into the start of August, but the wind stays cross-shore and annoying. The last couple of days are back to poor conditions. Bottom line: the best surf on offer is the morning of 27 July and the morning of 28 July, with solid east swell and moderate cross-shore wind. Not a classic, but there’s a window there for the committed.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Fri afternoon, min 24°C on Sat night). Mainly strong winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 25°C on Mon morning, min 24°C on Mon night). Mainly fresh winds. | ||||||||||||||||||||
Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||
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 6 | SSW 16 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | E 7 | ENE 8 | ENE 8 | ENE 8 | S 16 | S 15 | S 14 | S 14 | S 13 | SSW 24 | SSW 23 | SSW 22 | SSW 20 | SSW 20 | SSW 18 |
Wave Graph  | |||||||||||||||||||||
 kJ | 130 | 196 | 195 | 360 | 438 | 384 | 226 | 250 | 251 | 191 | 321 | 267 | 329 | 302 | 273 | 317 | 426 | 363 | 412 | 395 | 464 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross | cross | cross-on | cross-on | cross | cross-on |
High Tide | 5:35PM0.64m | 6:37AM0.35m | 6:10PM0.55m | 7:46AM0.40m | 6:42PM0.45m | 8:59AM0.45m | 7:13PM0.37m | 10:08AM0.51m | 7:46PM0.29m | 11:08AM0.55m | 8:50PM0.23m | 11:59AM0.59m | 10:38PM0.19m | ||||||||
Low Tide | 10:55AM0.08m | 00:53AM0.03m | 11:55AM0.16m | 1:26AM0.03m | 1:10PM0.23m | 1:58AM0.03m | 2:57PM0.28m | 2:33AM0.04m | 5:25PM0.28m | 3:12AM0.05m | 7:38PM0.23m | 3:57AM0.05m | 8:24PM0.18m | ||||||||
 | |  | | | | | |  | | | | | | | | | | | | | |
 | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 6:00 | — | — | 6:00 | — | — |
 | — | 7:15 | — | — | 7:15 | — | — | 7:14 | — | — | 7:14 | — | — | 7:14 | — | — | 7:13 | — | — | 7:13 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 26 | 25 | 26 | 25 | 24 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
Feels °C | 24 | 24 | 25 | 23 | 21 | 21 | 22 | 22 | 23 | 23 | 24 | 24 | 24 | 23 | 23 | 23 | 22 | 22 | 22 | 21 | 22 |
Swell 1 Height (m) Direction Period (s) | W 14 | SSW 16 | SSW 14 | SSW 13 | SSW 14 | SSW 14 | S 12 | SSW 13 | SSW 12 | S 14 | S 16 | S 15 | S 14 | S 14 | ENE 7 | S 13 | SSW 23 | S 13 | SSW 20 | SSW 20 | SSW 18 |
| kJ | 144 | 196 | 195 | 141 | 158 | 156 | 73 | 95 | 44 | 142 | 321 | 267 | 329 | 302 | 129 | 209 | 426 | 157 | 412 | 395 | 464 |
Swell 2 Height (m) Direction Period (s) | SW 16 | W 14 | W 13 | WNW 13 | WNW 13 | W 12 | S 19 | S 18 | S 18 | S 16 | SW 18 | SW 16 | SW 17 | SW 16 | S 13 | E 12 | S 13 | SSW 22 | E 12 | S 11 | S 11 |
| kJ | 125 | 98 | 90 | 57 | 56 | 28 | 66 | 106 | 97 | 135 | 81 | 69 | 72 | 67 | 273 | 95 | 125 | 363 | 137 | 127 | 57 |
Swell 3 Height (m) Direction Period (s) | SSW 12 | SSW 12 | SW 15 | SW 15 | SSE 9 | SSE 9 | W 12 | SSE 6 | NE 8 | SW 18 | W 12 | E 12 | E 12 | E 11 | E 11 | SSW 24 | E 11 | SSW 17 | S 12 | E 11 | E 11 |
| kJ | 55 | 55 | 58 | 55 | 8 | 15 | 25 | 6 | 15 | 83 | 11 | 12 | 25 | 40 | 61 | 317 | 82 | 202 | 97 | 121 | 59 |
Wind waves Height (m) Direction Period (s) | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | E 7 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 6 |
| kJ | 130 | 138 | 189 | 360 | 438 | 384 | 226 | 250 | 251 | 191 | 193 | 162 | 117 | 127 | 180 | 149 | 125 | 126 | 97 | 123 | 218 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 47 | 55 | 47 | 55 | 55 | 50 | 47 | 50 | 19 | 18 | 18 | 16 | 16 | 47 | 47 | 47 | 49 | 47 | 49 | 57 | 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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