Sandy Beach Surf Break

Lat Long: 21.29° N 157.67° W

Sandy Beach Surf Forecast and Surf Report

Issued: 7 am 18 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: Tuesday 25 Aug, 2AM (local time) - 8ft (2.4m), 8s period, ENE swell with 678 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 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 2.4m 8s and forecast to arrive on Tuesday (Aug 25) at 2AM. 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 6s period and expected on Thursday (Aug 20) 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 2AM (Tue 25th Aug)8ft (2.4m) 8s

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


The Lowdown

Alright, looking at Sandy Beach. It’s a beach and reef setup, fairly consistent, but the first week is a total bust. Water temp’s about 80°F, right around average for this time of year.

There’s a long dry spell before anything worth talking about shows up. From Tuesday the 18th of August all the way through the end of the month, the surf is just poor. Cross-shore winds, lumpy chop, no joy. The combined energy stays weak to moderate (like 64 to 406), and even when the swell hits 6 ft on Saturday the 22nd, it’s messy with a 25 mph cross-breeze. Not happening.

The real promise lands on the very last day of the forecast. Wednesday the 2nd of September – that’s your window. The morning is still iffy with a 6 ft SSW groundswell at 11 seconds, but the wind goes light and cross-on. The afternoon is the standout. It goes glassy – flat calm wind from the ESE at just 3 mph, swell 7 ft from the E at 8 seconds. The combined energy jumps to 1263, which is strong, and the report calls it excellent for experienced surfers. That’s big surf – over 5 ft – so leave it for the intermediates and experts.

Also keep an eye on the 30th and 31st of August. The swell gets huge – 10 ft to 12 ft from the E with 9-second periods and massive energy (1819 to 1969). But the wind is still cross and lumpy, and the report says it’s too big for this break. That’s a lot of groundswell pounding a beach and reef setup – could be a beast. Only for the hardy.

So, your best bet? That glassy Wednesday the 2nd of September afternoon. Clean, strong, and all yours. Just know what you’re getting into.

Rusty

Short Range Forecast

Mostly dry. Warm (max 26°C on Thu afternoon, min 24°C on Tue night). Winds decreasing (fresh winds from the ENE on Tue morning, light winds from the NNE by Thu night).

Days 4-6 Weather Summary

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

Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
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
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)
1.3
ENE
7
1
E
8
1.2
ENE
8
0.8
E
8
0.8
E
8
0.9
E
8
0.6
SSW
18
0.6
SSW
17
0.9
NE
7
0.8
ENE
7
1
ENE
7
0.8
SSW
16
1.2
ENE
6
1.7
ENE
6
2.1
E
7
2.3
E
7
2.1
E
7
2
ENE
7
2.2
ENE
7
2.1
ENE
7
2.4
ENE
8
Wave Graph
Metric surfscale
Energy kJ
165
120
155
86
100
102
207
200
82
67
96
322
107
226
428
569
439
350
435
456
678
Wind (km/h)
30
ENE
25
NE
25
ENE
25
NE
25
ENE
20
NE
20
ENE
20
NNE
5
ESE
5
E
15
ENE
20
ENE
35
ENE
40
ENE
30
ENE
45
ENE
40
NE
40
NE
40
ENE
35
ENE
35
ENE
Wind State
cross
cross
cross
cross
cross
cross
cross
cross-off
on
cross-on
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
High Tide
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
1:26PM0.65m
1:20AM0.27m
Low Tide
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
6:13AM0.06m
8:49PM0.11m
clear
clear
clear
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:09
6:09
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
Temp °C
25
25
25
25
25
25
25
26
26
26
27
26
26
26
25
25
25
25
25
25
25
Feels °C
23
22
23
25
24
25
26
28
29
30
29
27
26
24
23
22
22
22
22
22
23
  • Map Icons:
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  • 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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