Surf Forecasts:
Sandy Beach surf forecast from 16 Aug 2026:
- Best quality surf: Friday 21 Aug, 11PM (local time) - 2.5ft (0.8m), 16s period, SSW swell with cross-offshore winds.
- Most powerful swell: Sunday 16 Aug, 11AM (local time) - 10ft (3.0m), 9s period, ENE swell with 1,609 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 11PM (local time) - 2.5ft (0.8m), 16s 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 Friday (Aug 21) at 11PM. The primary swell is predicted to be 0.8m and 16s period with a secondary swell of 0.8m 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 3.0m 9s and forecast to arrive on Sunday (Aug 16) at 11AM. Winds are predicted to be onshore 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+) | 11PM (Fri 21st Aug) | 2.5ft (0.8m) 16s |
| Best Surf | 11PM (Fri 21st Aug) | 2.5ft (0.8m) 16s |
| Most Powerful | 11AM (Sun 16th Aug) | 10ft (3.0m) 9s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
Alright, Rusty here. Gonna break this one down for you. Looking at Sandy Beach over the next couple weeks, it’s a story of persistent wind and messy conditions, with only a late burst of size for the brave.
Straight off the bat, Sunday, August 16, we’ve got storm clouds and an onshore ESE breeze blowing 25 mph, muscling up a 10-foot ENE swell. The combined energy is cranking (2287), but it’s all blown out and ugly. Not a wave you’d paddle for.
That sets the tone. Through the rest of that week and into the next, it’s the same story: ENE winds at 15–25 mph, cross or cross-onshore, with swell from 1 to 5 feet. The energy stays moderate to weak, and every report says poor surf conditions. The odd long-period pulse from the SSW shows up, like on August 20 morning (2 feet, 18 seconds, energy 296), but with a cross breeze and no size, it’s a tease. You’ve got a solid 12-day stretch of nothing worth writing home about.
Then we get a late-month shift. From Saturday, August 29, the ENE swell starts to build, hitting 8–10 feet by Sunday, August 30 and Monday, August 31. The combined energy jumps into the strong range, up to 1548. But the wind stays cross from the ENE at 15–20 mph. The guidance notes the tide and wind are okay at times, but those 8–10 foot waves are expert-only, and with that chop and cross breeze, it’s more of a power show than clean surf. Honestly, that setup says kite surfer more than paddle surfer. The best of a messy bunch might be Monday, August 31 morning for experts only. Water temp is a balmy 80 degrees, which is about average for this time of year.
So, bottom line: Sandy Beach offers a whole lot of poor surf. The only real swell pulse is late in the run but comes with a cross-wind price tag. Not one for the quiver this time.
Rusty.
Short Range ForecastHeavy rain (total 39mm), heaviest during Sun morning. Warm (max 27°C on Sun morning, min 24°C on Mon night). Winds decreasing (strong winds from the ESE on Sun morning, light winds from the E by Sun night). | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Fri afternoon, min 24°C on Wed morning). Wind will be generally light. | ||||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | |||||||||||||||
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 9 | ENE 9 | ENE 8 | S 14 | S 14 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 8 | E 8 | E 8 | SSW 18 | SSW 17 | NE 7 | NE 7 | NE 7 | SSW 16 | ENE 7 | ENE 7 | SSW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1609 | 772 | 418 | 334 | 260 | 188 | 165 | 158 | 147 | 108 | 100 | 82 | 207 | 200 | 45 | 62 | 59 | 322 | 83 | 83 | 212 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross | cross | cross | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | on | on | cross-off | cross-on | cross | cross-on |
High Tide | 5:21PM0.47m | 6:52AM0.50m | 5:48PM0.38m | 7:56AM0.52m | 6:10PM0.31m | 9:08AM0.53m | 10:20AM0.55m | 8:45PM0.20m | 11:21AM0.57m | 10:59PM0.20m | 12:10PM0.60m | 00:02AM0.21m | |||||||||
Low Tide | 11:53AM0.20m | 00:11AM0.05m | 1:08PM0.25m | 00:39AM0.07m | 2:59PM0.27m | 1:14AM0.09m | 2:00AM0.10m | 7:38PM0.20m | 3:06AM0.11m | 7:49PM0.17m | 4:20AM0.10m | 8:09PM0.14m | |||||||||
 |  |  |  | |  |  | | | | | | | |  | | | | | | | |
 | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — |
 | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — |
mm | 27 | 8 | 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 27 | 27 | 27 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 27 | 27 | 26 |
Feels °C | 25 | 27 | 27 | 24 | 23 | 23 | 24 | 23 | 23 | 25 | 25 | 26 | 26 | 25 | 27 | 29 | 29 | 28 | 30 | 28 | 26 |
Swell 1 Height (m) Direction Period (s) | SSE 9 | ENE 9 | ENE 8 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 | E 8 | E 8 | E 8 | E 8 | E 8 | SW 16 | NE 7 | NE 7 | NE 7 | ENE 7 | SW 16 | E 8 |
| kJ | 885 | 772 | 418 | 334 | 260 | 170 | 165 | 119 | 116 | 108 | 84 | 82 | 74 | 54 | 274 | 62 | 59 | 69 | 83 | 251 | 130 |
Swell 2 Height (m) Direction Period (s) | S 13 | SSE 8 | SSE 7 | S 6 | SW 6 | SW 6 | SW 17 | SW 18 | SW 18 | SW 16 | SSW 16 | NE 6 | SSW 18 | SSW 17 | NE 7 | SW 17 | SW 16 | SSW 16 | SW 16 | E 6 | NE 7 |
| kJ | 115 | 350 | 66 | 32 | 12 | 5 | 74 | 80 | 79 | 129 | 100 | 38 | 207 | 200 | 45 | 291 | 261 | 322 | 261 | 28 | 77 |
Swell 3 Height (m) Direction Period (s) | S 16 | S 13 | S 14 | SW 18 | SSE 6 | WSW 6 | E 9 | SSE 8 | W 12 | S 12 | S 12 | SW 16 | NNE 7 | NNE 6 | E 7 | E 8 | SSE 8 | S 13 | S 12 | S 12 | SSW 16 |
| kJ | 132 | 123 | 250 | 50 | 6 | 4 | 15 | 13 | 26 | 44 | 45 | 129 | 35 | 27 | 27 | 21 | 14 | 54 | 47 | 76 | 212 |
Wind waves Height (m) Direction Period (s) | ENE 9 | SSE 8 | — | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | NNE 7 | NE 6 | — | — | — | — | — | — | — | — | ENE 7 | ESE 6 |
| kJ | 1609 | 604 | — | 250 | 231 | 188 | 149 | 158 | 147 | 31 | 32 | — | — | — | — | — | — | — | — | 83 | 70 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 140 | 42 | 5 | 47 | 47 | 19 | 47 | 18 | 16 | 47 | 16 | 16 | 15 | 16 | 5 | 5 | 14 | 5 | 47 | 47 | 16 |
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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