Sandy Beach Surf Break

Lat Long: 21.29° N 157.67° W

Sandy Beach Surf Forecast and Surf Report

Issued: 7 pm 18 Aug 2026 (local time)

Forecast update in  hr  min

Today's Sandy Beach sea temperature is
26.7° C
0.0° 

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 19 Aug 2026:

  • Best quality surf: Thursday 20 Aug, 8PM (local time) - 2ft (0.6m), 17s period, SSW swell with cross-offshore winds.
  • Most powerful swell: Monday 24 Aug, 8AM (local time) - 7.5ft (2.3m), 7s period, E swell with 585 kJ wave energy.
  • Next surfable swell (1★+): Thursday 20 Aug, 8PM (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 8PM. The primary swell is predicted to be 0.6m and 17s period with a secondary swell of 0.6m and 8s. Another secondary swell of 0.6m and 7s is also forecast. 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 2.3m 7s and forecast to arrive on Monday (Aug 24) at 8AM. Winds are predicted to be cross-shore 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 TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 8PM (Thu 20th Aug)2ft (0.6m) 17s
Best Surf 8PM (Thu 20th Aug)2ft (0.6m) 17s
Most Powerful 8AM (Mon 24th Aug)7.5ft (2.3m) 7s

Table - best surf conditions forecast for Sandy Beach over the next 16 days.


The Lowdown

Alright, Rusty here. Let’s be straight with you – it’s a tough stretch ahead for Sandy Beach. The overall pattern is dominated by persistent cross-shore winds, mostly from the ENE, that just won’t quit. For the first several days, the swell is small and the wind is messy, making for poor surf conditions.

We start off on Wednesday, 19 August, with a small 3ft easterly swell at 8 seconds, but it’s blown out by a 16 mph cross-shore wind. The combined wave energy is moderate (207), but it’s a messy cross-chop. Not worth paddling out for. Thursday, 20 August, offers a glimmer: a clean window in the afternoon. The wind switches to a light cross-offshore, and the swell is a tiny 2ft from the SSW with a very long 17-second period. The energy is moderate (287), and while it’s clean, it’s marginal surf. For a patient surfer, maybe a longboard could snag a few.

From Friday, 21 August, through to the end of the month, it’s a grim run. The wind cranks up from the ENE, often hitting 19-25 mph, and the swell is all short-period, cross-shore chop. The wave heights build from 3ft to over 7ft, but the quality is poor – the energy readings spike into the hundreds (595, 751, 727) but it’s just lumpy, messy, and often choppy. This is more of a kite-surfing setup than a paddle session. The swell is too short and the wind too strong for any decent shape.

The one standout, and it’s a long-range promise, arrives on Tuesday, 1 September. The morning has a 7ft ENE swell with a 11-second period, and the combined energy is a massive 1506 – strong wave energy. The afternoon gets even better: 8ft from the E at 13 seconds, with 2512 energy. This is real groundswell, but for Sandy Beach, a beach and reef setup, that long period can make the waves break too straight. The wind is still cross-shore, so it won’t be perfect. It’s a marginal call, but it’s the only shot at something with real power. Wednesday, 2 September, is bigger still – 10ft – but with 25 mph winds, that’s for experts only, and the conditions are messy.

So, the best on offer is that Tuesday, 1 September window. The swell is solid, the period is long, and the energy is high. But don’t expect it to be clean. The rest of the 16-day window is a write-off. Sandy Beach (Big Island) is exposed to the trade winds, and we’re in a pattern that’s not giving us a break. The water temperature is about average for this time of year, so no cold shock, but that’s little comfort when the surf is this rough.

Stay patient, folks. The forecasts can change, but right now, it’s a waiting game.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 26°C on Thu afternoon, min 24°C on Tue night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 4mm), mostly falling on Mon afternoon. Warm (max 26°C on Fri night, min 25°C on Fri night). Winds increasing (light winds from the ENE on Fri night, near gales from the ENE by Mon morning).

Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
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
1
1
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)
1.2
ENE
8
0.9
E
8
0.8
E
8
0.9
E
8
0.6
SSW
18
0.6
SSW
17
0.9
NE
7
0.8
NE
7
0.9
ENE
7
0.8
SSW
16
1.2
ENE
7
1.5
ENE
7
2.1
E
7
1.9
ENE
7
2
ENE
7
2.2
ENE
7
2.1
E
7
2
E
8
2.1
E
8
Wave Graph
Metric surfscale
Energy kJ
159
109
100
102
207
200
84
57
86
322
121
195
457
332
340
448
465
488
573
Wind (km/h)
25
ENE
25
ENE
25
NE
20
NE
15
NE
15
NNE
10
NE
10
E
20
ENE
20
ENE
35
ENE
35
ENE
40
ENE
40
ENE
40
NE
45
NE
50
ENE
30
E
40
ENE
Wind State
cross
cross
cross
cross
cross
cross-off
cross
cross-on
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
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
Low Tide
1:14AM0.09m
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
clear
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:09
6:09
6:09
6:11
6:11
6:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:58
6:57
6:57
6:55
6:54
6:53
6:52
 mm
4
11
Temp °C
25
25
25
25
25
26
26
26
26
26
26
26
25
25
25
25
26
26
25
Feels °C
23
25
25
24
26
28
29
29
28
27
24
23
23
22
22
22
21
23
24
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder
How to use the Wavefinder 
submit an eyeball surf report

Quick surf report for Sandy Beach:

join our community of surf reporters

FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Sandy Beach surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.


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.

Nearest locationNearest