Surf Forecasts:
Sandy Beach surf forecast from 19 Aug 2026:
- Best quality surf: Thursday 20 Aug, 5PM (local time) - 2ft (0.6m), 17s period, SSW swell with cross-offshore winds.
- Most powerful swell: Friday 21 Aug, 11PM (local time) - 2.5ft (0.8m), 16s period, SSW swell with 322 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 5PM (local time) - 2ft (0.6m), 17s 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 Thursday (Aug 20) at 5PM. The primary swell is predicted to be 0.6m and 17s period with a secondary swell of 1.1m 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 0.8m 16s and forecast to arrive on Friday (Aug 21) 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 0.7m 16s period and expected on Friday (Aug 21) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Thu 20th Aug) | 2ft (0.6m) 17s |
| Best Surf | 5PM (Thu 20th Aug) | 2ft (0.6m) 17s |
| Most Powerful | 11PM (Fri 21st Aug) | 2.5ft (0.8m) 16s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
Alright, let’s get into it. Sandy Beach is the only spot on the radar, and honestly, it’s a rough stretch ahead. The water’s sitting at 80°, right about average for this time of year, so no surprises there. But the surf? It’s a long, frustrating wait.
We start Wednesday, August 19th, with nothing worth paddling out for. Small, weak swell, cross-shore wind, lumpy conditions. That carries through Thursday morning, but Thursday afternoon shows a glimmer—light cross-offshore breeze, clean conditions, and a 0.6m SSW groundswell at 17 seconds. That’s a long-period swell, better suited for a reef or point break, but at Sandy Beach (beach and reef) it might still offer a few clean ones. Don’t get your hopes up too high, though.
Friday through Sunday, August 21st to 23rd, it’s back to poor surf. Wind picks up, cross-chop, and the swell stays small and messy. By Saturday and Sunday, the swell height climbs to 1.7m, but it’s short-period ENE windswell, and the wind is strong—over 40 km/h. The wave energy is moderate (424 to 446), but the wind is ruining any chance of a decent wave. It’s gonna look more like a washing machine than a surf break.
Monday, August 24th, sees a brief spike in long-period SSW swell (14 seconds, energy 428) but the wind is cross-onshore and lumpy. No good. Tuesday and Wednesday, August 25th–26th, stay poor—fresh cross-shore wind, lumpy, small surf. The wind stays onshore or cross-shore every day, with moderate to strong breezes, and the wave comment is “poor surf conditions” for almost every session.
The second week doesn’t offer much hope either. From August 27th through to September 3rd, the swell gets bigger—2.0m to 2.2m by September 1st and 2nd—but the wind never lets up. It’s always cross-shore or cross-onshore, 30–40 km/h, lumpy and messy. The wave energy is massive by September 1st (1045 to 1534), but it’s all short-period windswell, and the wind is too strong to make it rideable. The comments shift to “marginal surf forecast or questionable tide conditions” by September 1st, but still, it’s not a standout.
The only real standout? Honestly, there isn’t one. Thursday afternoon, August 20th, is the best—clean, light wind, a long-period groundswell, but it’s tiny. If you’re desperate for a surf, that’s your window. Otherwise, this is a 16-day stretch of poor to marginal conditions, with no real winners. The consistent wind and lack of a proper swell window mean it’s a tough run for Sandy Beach. Could be a kite session if the wind holds, but for a paddle surfer? Hard to recommend.
Rusty
Short Range ForecastMostly dry. Warm (max 27°C on Thu afternoon, min 24°C on Wed morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Mon afternoon. Warm (max 26°C on Sat morning, min 25°C on Sat night). Mainly strong winds. | ||||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | |||||||||||||||
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) | E 8 | E 8 | ENE 7 | SSW 18 | SSW 17 | ENE 7 | ENE 7 | NE 7 | SSW 16 | E 6 | ENE 7 | ENE 7 | ENE 7 | SSW 15 | ENE 6 | SSW 14 | ENE 6 | ENE 6 | E 8 | ENE 8 | ENE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 111 | 100 | 153 | 207 | 200 | 108 | 51 | 67 | 322 | 84 | 186 | 261 | 247 | 220 | 172 | 166 | 182 | 153 | 294 | 314 | 210 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross-off | cross | cross-on | cross | cross-on | cross-on | cross | cross | cross | cross | cross | cross-on | cross | cross-on | cross | cross | cross |
High Tide | 9:08AM0.53m | 10:20AM0.55m | 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 | ||||||||
Low Tide | 2:00AM0.10m | 7:38PM0.20m | 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 | |||||||||
 | |  |  | | | | | | | | | | |  | |  |  | | | | |
 | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — |
 | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 2 | — | — | 1 |
Temp °C | 25 | 25 | 25 | 25 | 27 | 27 | 26 | 27 | 27 | 26 | 26 | 25 | 25 | 25 | 25 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 25 | 25 | 24 | 26 | 29 | 30 | 30 | 30 | 29 | 26 | 24 | 23 | 22 | 21 | 22 | 24 | 25 | 24 | 26 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 8 | ENE 7 | E 8 | ENE 7 | ENE 7 | ENE 7 | NE 7 | SSW 16 | E 6 | SW 16 | SSW 16 | SSE 13 | SSW 15 | E 9 | SSW 14 | SSW 13 | E 8 | SSW 12 | SSW 16 | SSW 15 |
| kJ | 111 | 84 | 153 | 71 | 127 | 108 | 51 | 67 | 322 | 84 | 255 | 212 | 101 | 191 | 54 | 166 | 156 | 69 | 86 | 142 | 121 |
Swell 2 Height (m) Direction Period (s) | NNE 7 | S 12 | SW 16 | NE 6 | SSW 17 | SW 16 | SW 17 | SW 16 | W 10 | NE 7 | W 11 | S 14 | SW 15 | SSE 13 | SW 14 | SSE 12 | SSE 12 | SSW 13 | S 16 | SSW 12 | SSW 12 |
| kJ | 30 | 45 | 129 | 42 | 200 | 274 | 291 | 264 | 50 | 54 | 64 | 104 | 115 | 35 | 99 | 50 | 48 | 93 | 131 | 56 | 56 |
Swell 3 Height (m) Direction Period (s) | SW 16 | SSW 16 | S 12 | SSW 18 | W 11 | W 9 | NNE 7 | W 10 | S 13 | SW 16 | S 12 | WNW 10 | SSW 15 | WNW 10 | SSE 13 | SSW 18 | SSW 18 | SSE 12 | SSE 12 | SSE 11 | SSW 18 |
| kJ | 129 | 100 | 45 | 207 | 37 | 14 | 26 | 52 | 54 | 261 | 47 | 33 | 76 | 21 | 56 | 62 | 31 | 46 | 29 | 43 | 108 |
Wind waves Height (m) Direction Period (s) | E 8 | NE 6 | NNE 6 | — | — | — | — | — | ENE 7 | — | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | E 8 | ENE 8 | ENE 7 |
| kJ | 48 | 31 | 51 | — | — | — | — | — | 102 | — | 186 | 261 | 247 | 220 | 172 | 150 | 182 | 153 | 294 | 314 | 210 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 18 | 14 | 5 | 0 | 5 | 5 | 14 | 5 | 55 | 57 | 63 | 62 | 63 | 55 | 55 | 47 | 47 | 47 | 48 | 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.
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