Sandy Beach Surf Break

Lat Long: 21.29° N 157.67° W

Sandy Beach Surf Forecast and Surf Report

Issued: 7 am 21 Aug 2026 (local time)

Forecast update in  hr  min

Today's Sandy Beach sea temperature is
26.8° C
0.1° 

Sandy Beach surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Sandy Beach surf forecast from 21 Aug 2026:

  • Most powerful swell: Thursday 27 Aug, 11AM (local time) - 3.5ft (1.1m), 17s period, S swell with 716 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 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 17s period and expected on Friday (Aug 21) at 2PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11AM (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 have a look at what we've got coming up for Sandy Beach over the next couple of weeks. I gotta be straight with you – this isn't one of those classic, pumpin' forecasts. The whole window is a real battle with the wind, and the swell direction just isn't playing ball.

We kick off Friday the 21st with tiny, grovelly waves around 2ft to 3ft. The wind is straight out of the ENE, blowing cross or cross-on, and the combined swell energy is weak at best (71). It's gonna be a ripply, lumpy mess. Not worth paddling out. That stays the same right through the weekend and into next week. The swell does pick up a bit, hitting 6ft on Sunday the 23rd, and the energy climbs into the moderate range (502), but that constant, fresh to strong ENE cross-shore wind (25 mph) is going to chop it all up. It's just poor quality surf, session after session. On Monday the 22nd of August, the water temp is a pleasant 80°F, which is pretty much average for this time of year.

We roll through that entire first week with the same story: messy, cross-shore wind and lumpy conditions. The swell heights hover around 5ft to 5ft, but the wind just won't let up. By Wednesday the 26th, the swell direction swings around to the SSW and S, and the period jumps to 14 and then 18 seconds – that's proper long-period groundswell, with energy hitting strong levels (588 and 606). But here's the kicker: the wind is still a fresh cross-shore from the ENE at 22 mph. That strong, clean swell is getting completely torn apart by the side-wind. It's frustrating to watch.

The pattern continues through the 27th, 28th, and 29th. The swell energy is strong to very strong, with some readings over 1000, but it's all coming from the south or east with long periods, and the cross-wind is relentless. The beach break is going to be a wall of fat, straight lines with a horrible cross-chop on top. Honestly, this setup looks more interesting for the kite surfers than for us with a paddle.

Now, late in the run, things get... different. On Monday the 31st of August, the swell blows up. We're looking at 10ft to 12ft from the ENE, with wind and tide that are supposedly favorable. That sounds exciting, right? Well, the combined energy is monstrous (2133 and 2779), but the file itself tells us it's too big for this break. That's expert-only territory, and likely a washing machine. By September 1st, the wind cranks up to a near gale (31 mph) with rain showers, making it a complete mess.

The last few days, from September 2nd to the 5th, we see the swell drop back to 6ft to 7ft. The wind finally looks a little lighter, even switching to onshore from the SE for a brief moment on the morning of the 2nd. We get some periods with a "gentle breeze" and "marginal" conditions, so maybe, just maybe, you'll find a couple of clean-ish corners on the 4th or 5th of September if you're desperate. But honestly? This 16-day stretch is a write-off. The wind just has our number, and when the swell is big enough to be good, it's wrong for the break. Keep the board in the car, and wait for the next one.

Rusty

Short Range Forecast

Mostly dry. Warm (max 27°C on Fri afternoon, min 25°C on Sat night). Winds increasing (calm on Fri morning, strong winds from the ENE by Sat night).

Days 4-6 Weather Summary

Mostly dry. Warm (max 26°C on Mon morning, min 25°C on Mon morning). Mainly fresh winds.

Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Thursday
27
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.7
NNE
7
1.1
NE
7
0.8
SSW
16
1.4
ENE
7
1.6
ENE
7
2
E
7
1.7
ENE
7
1.6
ENE
7
1.6
ENE
6
0.7
SSW
14
1.6
ENE
6
1.5
ENE
7
1.6
E
8
1.6
ENE
7
1.6
ENE
7
0.7
SSW
14
0.7
S
18
0.7
S
19
1.1
S
17
0.9
S
16
1
S
16
Wave Graph
Metric surfscale
Energy kJ
40
106
322
173
238
423
301
223
212
168
218
187
324
276
239
215
307
351
716
417
482
Wind (km/h)
10
ENE
20
NE
15
ENE
40
ENE
40
ENE
35
ENE
40
ENE
40
ENE
35
ENE
35
ENE
35
ENE
35
ENE
30
ENE
35
ENE
35
ENE
35
ENE
35
NE
30
ENE
35
ENE
30
ENE
30
ENE
Wind State
cross
cross
cross-on
cross
cross
cross-on
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
cross
cross
cross-on
cross-on
cross
cross
High Tide
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
2:53PM0.66m
3:07AM0.39m
Low Tide
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
8:15AM0.04m
9:49PM0.07m
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
part cloud
clear
part cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:09
6:11
6:11
6:11
6:11
6:11
6:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:55
6:54
6:53
6:52
6:52
6:52
6:51
 mm
Temp °C
26
27
27
26
26
25
26
26
25
26
26
26
26
26
25
25
25
25
25
25
25
Feels °C
30
29
28
26
24
22
24
23
23
24
24
26
25
23
23
21
22
23
24
22
23
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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