Sandy Beach Surf Break

Lat Long: 21.29° N 157.67° W

Sandy Beach Surf Forecast and Surf Report

Issued: 7 am 17 Aug 2026 (local time)

Forecast update in  hr  min

Today's Sandy Beach sea temperature is
26.9° C
0.2° 

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 18 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: Saturday 22 Aug, 11PM (local time) - 6.5ft (2.0m), 7s period, ENE swell with 371 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 0.8m 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 2.0m 7s and forecast to arrive on Saturday (Aug 22) 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 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 Powerful11PM (Sat 22nd Aug)6.5ft (2.0m) 7s

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


The Lowdown

Alright, Rusty here. Let's have a look at what's shaping up.

Honestly, it's a tough stretch ahead. For the next week and a half, the conditions are just not playing ball. We’re looking at a long run of poor surf at Sandy Beach, with the wind stuck in an ENE pattern that’s going to mess things up.

Starting on Monday the 17th and running right through to around the 26th of August, it's a write-off. The wind is coming in strong from the east-northeast, creating a lumpy, cross-shore chop that’s going to ruin any chance of a clean wave. The swell is there, but it's weak or short-period windswell, and the wind is just too raw. The combined swell energy stays moderate for most of this time, in the low to mid hundreds, but the quality is just not there. You’d be fighting a messy, bumpy surface.

The wind is relentless. From Monday the 17th onward, it's a moderate to fresh breeze, sometimes even a strong breeze, always cross-shore. It’s the kind of wind that makes you paddle hard for a lumpy, sectiony wave. Not worth it. The swell size stays small, under 1.5m (about 5 ft), so it’s not even a power thing—it’s just ugly.

Then from the 23rd of August onward, the swell starts to build, but the wind stays strong and cross-shore. By Monday the 25th, the swell is up to 2.5m (about 8 ft), but with that 28 mph cross-shore wind, it’s a messy, blown-out mess. The combined wave energy jumps up into the four-digit range, showing there’s a lot of power, but the conditions are terrible. It’s the kind of setup that looks more interesting for kite surfing than paddle surfing. This gets even bigger on Wednesday the 26th, with 3.5m (about 12 ft) swells and massive energy, but still a strong cross-shore wind. Not for paddling.

The only glimmer in the whole 16-day run is on Thursday the 27th of August. The forecast actually says "wind and tide favorable" for Sandy Beach, but there’s a catch. The swell is predicted to be 3.5m (about 12 ft) from the east with a 9-second period. That’s a lot of water moving, with massive combined energy. For a beach and reef break, that’s expert territory only. The wind is still a fresh cross-shore, but the conditions are supposed to align. If you’re a seasoned charger with a big-wave gun, this might be your window. For everyone else, it’s a day to watch from the sand. The rest of that week and into September, it's back to poor surf and strong winds.

Water temp is sitting at a very normal 80°F for this time of year, so no surprises there.

So, to be straight with you: don't bother getting the board wet until that Thursday the 27th, and even then, only if you know what you’re doing. This is a long blank run. It happens here sometimes. Forecasts can change, but right now, it’s a waiting game.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 25°C on Mon morning, min 24°C on Mon night). Mainly fresh winds.

Days 4-6 Weather Summary

Mostly dry. Warm (max 26°C on Thu morning, min 25°C on Thu morning). Winds increasing (light winds from the NE on Thu night, fresh winds from the ENE by Sat night).

Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
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)
1.6
ENE
8
0.8
S
14
1.3
ENE
7
1.3
ENE
7
1.3
ENE
7
1.2
ENE
7
0.9
E
8
0.8
E
8
0.8
E
8
0.6
SSW
18
0.6
SSW
17
0.7
E
7
0.7
NE
7
0.9
NE
7
0.8
SSW
16
1.1
ENE
6
1.4
ENE
7
1.8
ENE
7
1.7
ENE
7
1.7
ENE
7
1.9
ENE
7
Wave Graph
Metric surfscale
Energy kJ
334
260
172
145
149
151
107
100
82
207
200
52
47
67
322
87
166
302
285
241
326
Wind (km/h)
30
ENE
30
ENE
35
ENE
25
ENE
30
ENE
30
ENE
20
ENE
25
NE
15
NE
15
NE
20
NE
10
NE
10
ENE
15
E
20
ENE
20
ENE
35
ENE
30
ENE
35
ENE
35
ENE
35
ENE
Wind State
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross
cross
cross
cross-on
cross
cross
cross
High Tide
5:48PM0.38m
7:56AM0.52m
6:10PM0.31m
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
Low Tide
1:08PM0.25m
00:39AM0.07m
2:59PM0.27m
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
part cloud
part cloud
part cloud
clear
clear
part cloud
part cloud
clear
part cloud
clear
clear
clear
clear
part cloud
clear
clear
clear
part cloud
part cloud
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:09
6:09
6:09
6:09
6:09
6:11
6:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:59
6:58
6:57
6:57
6:55
6:54
6:53
 mm
Temp °C
25
25
25
25
25
25
25
25
25
26
26
25
26
26
26
26
26
25
25
25
25
Feels °C
25
24
23
23
23
23
25
25
25
27
27
27
29
28
28
27
24
24
23
22
22
  • 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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