Surf Forecasts:
Sandy Beach surf forecast from 21 Aug 2026:
- Best quality surf: Friday 21 Aug, 8AM (local time) - 2.5ft (0.7m), 7s period, ENE swell with glassy winds.
- Most powerful swell: Thursday 27 Aug, 11AM (local time) - 3.5ft (1.0m), 17s period, S swell with 593 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 8AM (local time) - 2.5ft (0.7m), 7s period with ENE 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 8AM. The primary swell is predicted to be 0.7m and 7s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Sandy Beach in the next 16 days are 1.0m 17s and forecast to arrive on Thursday (Aug 27) at 11AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 16s period and expected on Friday (Aug 21) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Fri 21st Aug) | 2.5ft (0.7m) 7s |
| Best Surf | 8AM (Fri 21st Aug) | 2.5ft (0.7m) 7s |
| Most Powerful | 11AM (Thu 27th Aug) | 3.5ft (1.0m) 17s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
G’day, Rusty here, and I gotta be straight with you—this forecast is a tough one for Sandy Beach. We’re looking at a 16-day window, and honestly, there’s no real standout session to get excited about. The first surfable recommendation doesn’t show up until Friday, the 28th of August, and even then it’s only a marginal call. Before that, from now through to Thursday the 27th, it’s all poor surf conditions with messy cross-shore winds and lumpy chop. That’s a solid week of nothing worth paddling out for.
Sandy Beach (beach and reef) is an exposed spot that loves an ESE swell, but the wind is the problem here. We’ve got persistent ENE winds blowing cross-shore, mostly fresh to strong breezes, which just churns the ocean into a cross-chop mess. Even when the swell picks up, the quality is wrecked. The water temperature is about average for the time of year, so no surprises there.
The first faint glimmer comes on Friday morning, the 28th of August, with a 3ft swell from the east at 16 seconds. That’s a long-period groundswell, which means it’ll have some energy and shape, but the cross-onshore wind still makes it lumpy. The combined energy is moderate though, sitting at 915. By Friday afternoon, the swell drops to 4ft from the east, but the period shortens to 15 seconds, and the energy jumps to 1057—still moderate. It’s marginal, not clean. The break is fairly consistent, but with the wind, you’re fighting a lumpy surface.
The weekend of the 30th and 31st of August sees a bigger swell building—up to 6ft to 8ft from the ENE, with periods around 13 seconds. That’s solid groundswell, but it’s still cross-shore winds, and the waves are messy. The energy hits strong levels: 1331 on Sunday morning, 1578 on Sunday afternoon, and 1769 on Monday morning. This is getting into the territory where it’s too big for beginners, and with the wind, it’s only for experienced surfers who don’t mind a battle. The crowd profile at Sandy Beach is often busy, so you’ll have company, but the conditions won’t be worth it.
The real kicker comes on the 1st of September—Tuesday morning—with a 10ft swell from the ENE, period 13 seconds, and near-gale winds from the NNE at 31 to 37 mph. That’s a massive 4950 to 5443 combined energy, which is very strong, but the wind is cross-offshore, so the surface might be clean. However, 10ft is only for experts, and the wind is brutal. It’s also a rain showers day. This is more of a kite-surfing setup than a paddle-surfing one, given the strength of the wind and the size of the swell.
After that, the swell drops back to 5ft to 8ft through the 3rd and 4th of September, but the winds stay cross or cross-onshore, keeping it lumpy. The 5th of September sees a short-period 4ft ENE swell at 8 seconds, which is weak and won’t hold shape.
So, the best on offer? It’s a toss-up between the 28th of August afternoon and the 30th of August morning, but honestly, neither is a standout. The 28th has a cleaner line-up potential with the long-period, but the wind is rubbish. The 30th has more size, but the same wind problem. I’d say the 28th afternoon is the pick, but it’s a low bar. Crowds are likely at Sandy Beach, so don’t expect a quiet session.
Rusty
Short Range ForecastMostly dry. Warm (max 27°C on Fri afternoon, min 25°C on Thu night). Winds increasing (calm on Fri morning, strong winds from the ENE by Sat night). | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Tue afternoon, min 24°C on Wed morning). Mainly fresh winds. | ||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | ||||||||||||||
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 7 | NNE 7 | NE 7 | SSW 16 | ENE 7 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 6 | SSW 14 | SSW 13 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | SSW 14 | S 18 | S 19 |
Wave Graph | |||||||||||||||||||
108 | 42 | 106 | 322 | 161 | 198 | 286 | 293 | 247 | 212 | 176 | 156 | 139 | 191 | 208 | 204 | 215 | 304 | 354 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | cross-on | cross | cross-on | cross | cross | cross-on |
High Tide | 8:45PM0.20m | 11:21AM0.57m | 10:59PM0.20m | 12:10PM0.60m | 00:02AM0.21m | 12:51PM0.62m | 00:45AM0.24m | 1:26PM0.65m | 1:20AM0.27m | 1:56PM0.66m | 1:55AM0.30m | 2:25PM0.67m | 2:30AM0.34m | ||||||
Low Tide | 3:06AM0.11m | 7:49PM0.17m | 4:20AM0.10m | 8:09PM0.14m | 5:23AM0.08m | 8:29PM0.12m | 6:13AM0.06m | 8:49PM0.11m | 6:56AM0.04m | 9:09PM0.10m | 7:36AM0.04m | 9:29PM0.09m | |||||||
— | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | |
6:57 | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 27 | 27 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 25 | 25 | 25 | 25 |
Feels °C | 29 | 30 | 30 | 28 | 26 | 24 | 22 | 23 | 22 | 23 | 23 | 23 | 24 | 23 | 24 | 23 | 21 | 22 | 22 |
Swell 1 Height (m) Direction Period (s) | ENE 7 | SW 17 | NE 7 | SSW 16 | ENE 7 | SW 16 | SSW 16 | S 13 | SSW 15 | SW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 12 | SSW 16 | SSW 15 | SSW 14 | S 18 | S 19 |
108 | 291 | 67 | 322 | 161 | 255 | 212 | 90 | 191 | 100 | 166 | 156 | 127 | 85 | 142 | 121 | 215 | 304 | 354 | |
Swell 2 Height (m) Direction Period (s) | SW 16 | NNE 7 | SW 16 | W 10 | SW 16 | W 10 | S 14 | SW 15 | SSE 13 | SSE 13 | SSE 12 | E 8 | SSE 12 | SSW 16 | SSW 12 | SSW 12 | S 18 | SSW 13 | SSW 13 |
274 | 42 | 261 | 50 | 261 | 53 | 104 | 116 | 34 | 96 | 50 | 36 | 78 | 146 | 81 | 81 | 165 | 135 | 137 | |
Swell 3 Height (m) Direction Period (s) | W 9 | W 11 | W 10 | S 13 | W 10 | S 12 | WNW 10 | SSW 15 | WNW 10 | SSW 15 | SSW 18 | SSE 12 | SSW 17 | SSE 12 | SSE 7 | SSW 18 | SSE 12 | SSE 12 | SSW 16 |
27 | 57 | 49 | 54 | 50 | 47 | 34 | 76 | 22 | 71 | 62 | 48 | 94 | 29 | 10 | 109 | 27 | 14 | 87 | |
Wind waves Height (m) Direction Period (s) | — | — | NE 7 | ENE 7 | NE 7 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | E 6 | ENE 7 |
— | — | 106 | 107 | 91 | 198 | 286 | 293 | 247 | 212 | 176 | 125 | 139 | 191 | 208 | 204 | 160 | 194 | 135 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 5 | 5 | 14 | 42 | 49 | 55 | 55 | 55 | 55 | 47 | 49 | 55 | 47 | 48 | 48 | 47 | 49 | 49 | 47 |
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.











