Surf Forecasts:
Sandy Beach surf forecast from 21 Aug 2026:
- Best quality surf: Friday 21 Aug, 5AM (local time) - 2.5ft (0.8m), 7s period, NE swell with glassy winds.
- Most powerful swell: Thursday 27 Aug, 11AM (local time) - 3.5ft (1.1m), 17s period, S swell with 716 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 5AM (local time) - 2.5ft (0.8m), 7s period with NE 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 5AM. The primary swell is predicted to be 0.8m 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 1.1m 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+) | 5AM (Fri 21st Aug) | 2.5ft (0.8m) 7s |
| Best Surf | 5AM (Fri 21st Aug) | 2.5ft (0.8m) 7s |
| Most Powerful | 11AM (Thu 27th Aug) | 3.5ft (1.1m) 17s |
Table - best surf conditions forecast for Sandy Beach over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s take a look at what’s on the cards for Sandy Beach over the next couple of weeks.
To be straight with you, the first week and a half is a bit of a write-off. There’s really nothing worth paddling out for from Thursday the 20th right through until Monday the 31st of August. That’s a long stretch of flat, messy conditions, with the wind howling from the ENE and cross-shore all day, every day. The wave energy is there, sure, hitting moderate to strong levels, but it’s all wind-slop with short, weak periods, and the quality is just completely missing. You’d be better off taking the dog for a walk.
Now, after that long dry spell, things finally start to look a little more promising as we move into September.
The standout window, and really the only true highlight across the entire forecast, arrives on Thursday the 3rd of September. The swell drops a touch from the 7ft monster to a solid 7ft, but the wind swings around to a cross-offshore from the NNE, which will clean things up nicely. The energy is still very strong, and with a period of 9 seconds, there’ll be some push. For the more experienced crew, this is your moment.
Then, into Friday the 4th of September, it gets even better. The wind eases right back to a gentle breeze, and stays cross-offshore from the NNE. We’re looking at a 5ft ENE swell in the morning, bumping up to 6ft in the afternoon, with solid energy behind it. The guidance is calling for very good surf conditions by the afternoon. With clean, glassy conditions like that, Sandy Beach will be your best bet in the region. Keep in mind this is a beach and reef set-up, a spot that is fairly consistent, and with this clean wind, it’ll be well worth the wait.
A quick word on the water temps – when things get going on the 3rd, the water is sitting at a warm 80°, which is dead-on average for this time of year. No surprises there.
So, to sum it up: a long, boring stretch, then a tidy little opportunity on the 3rd and especially the 4th of September. Don’t sleep on that Friday afternoon session.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Thu afternoon, min 25°C on Thu morning). Winds increasing (calm on Thu night, strong winds from the ENE by Sat night). | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Mon afternoon, min 25°C on Sun morning). Mainly strong winds. | ||||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | |||||||||||||||
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) | SSW 18 | SSW 17 | ENE 7 | NE 7 | NE 7 | SSW 16 | ENE 7 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 7 | SSW 14 | SSW 13 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | SSW 14 | S 19 | S 18 |
Wave Graph  | |||||||||||||||||||||
 kJ | 207 | 200 | 108 | 57 | 67 | 322 | 117 | 178 | 255 | 220 | 295 | 247 | 188 | 156 | 181 | 254 | 284 | 212 | 215 | 450 | 311 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 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 | 2:25PM0.67m | 2:30AM0.34m | |||||||
Low Tide | 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 | 7:36AM0.04m | 9:29PM0.09m | ||||||||
 | |  | | | | | | | | |  |  | | | | | |  | | | |
 | 6:09 | — | — | 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 | 27 | 26 | 26 | 27 | 27 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 25 | 25 | 25 |
Feels °C | 29 | 29 | 29 | 29 | 30 | 29 | 26 | 22 | 22 | 22 | 22 | 22 | 23 | 24 | 23 | 23 | 25 | 23 | 23 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | E 8 | ENE 7 | ENE 7 | NE 7 | NE 7 | SSW 16 | SW 16 | SW 16 | SSW 16 | E 8 | SSW 15 | SW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 12 | SSW 16 | SSW 15 | SSW 14 | S 19 | S 18 |
| kJ | 54 | 131 | 108 | 57 | 67 | 322 | 261 | 255 | 212 | 64 | 191 | 100 | 166 | 156 | 127 | 85 | 142 | 121 | 215 | 450 | 311 |
Swell 2 Height (m) Direction Period (s) | NE 6 | SSW 17 | SW 16 | SW 17 | SW 16 | W 10 | WNW 10 | W 11 | S 14 | SW 15 | WNW 12 | SSE 13 | SSE 12 | ESE 8 | E 8 | SSW 16 | SSW 12 | SSW 12 | SSW 18 | SSW 13 | SSW 13 |
| kJ | 42 | 200 | 274 | 291 | 264 | 50 | 35 | 58 | 106 | 115 | 27 | 56 | 85 | 55 | 37 | 146 | 56 | 56 | 107 | 135 | 135 |
Swell 3 Height (m) Direction Period (s) | SSW 18 | W 11 | W 9 | W 11 | W 10 | S 13 | S 12 | S 12 | WNW 10 | S 13 | SSE 13 | SSW 15 | SSW 18 | SSE 12 | SSW 17 | SSE 12 | SSE 7 | SSW 18 | S 21 | SSE 12 | SSW 16 |
| kJ | 207 | 37 | 27 | 57 | 49 | 54 | 47 | 47 | 35 | 90 | 35 | 71 | 62 | 47 | 94 | 28 | 9 | 109 | 79 | 27 | 51 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | ENE 7 | ENE 7 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 6 |
| kJ | — | — | — | — | — | 85 | 117 | 178 | 255 | 220 | 295 | 247 | 188 | 113 | 181 | 254 | 284 | 212 | 172 | 161 | 147 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 5 | 5 | 5 | 5 | 5 | 5 | 47 | 57 | 55 | 61 | 63 | 47 | 49 | 55 | 47 | 48 | 49 | 47 | 47 | 47 | 20 |
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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