Waimanalo Surf Break

Lat Long: 21.35° N 157.70° W

Waimanalo Surf Forecast and Surf Report

Issued: 7 pm 30 Aug 2026 (local time)

Forecast update in  hr  min

Today's Waimanalo sea temperature is
26.9°C
0.1° 

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


Waimanalo surf forecast from 31 Aug 2026:

  • Most powerful swell: Saturday 5 Sep, 5PM (local time) - 8ft (2.5m), 13s period, ENE swell with 2,477 kJ wave energy.

Best Forecast Surf Conditions for Waimanalo this week:

The most powerful waves expected at Waimanalo in the next 16 days are 2.5m 13s and forecast to arrive on Saturday (Sep 05) at 5PM. 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 11s period and expected on Saturday (Sep 05) at 11AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 5PM (Sat 5th Sep)8ft (2.5m) 13s

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


The Lowdown

Alright, folks. Rusty here. It’s gonna be a tough couple of weeks for the most part. The wind is just going to be a problem for the first week, and the waves won’t be clean.

Starting Monday, the 31st of August, the trade wind is blowing straight onshore at 22 mph, and it’s not backing off. The swell is 6 ft, but it’s short-period junk at 7 seconds, and the energy is weak to moderate. The conditions are poor, and the waves will be a choppy mess. The same story carries through Tuesday, Wednesday, and into Thursday, with the wind actually picking up to a strong breeze at 28 mph. The swell gets a little bigger, hitting 7 ft to 8 ft, but the period is still short, and it’s a washing machine. By Friday, the 4th of September, the swell is up to 8 ft, but the wind is still strong and onshore. The energy is moderate, but it’s just unsurfable.

Through the first weekend, the wind switches to a cross-onshore, but it’s still fresh. The swell really starts to pump on Saturday the 5th, with an 8 ft swell and a long 13-second period, sending the energy through the roof. But that fresh cross-onshore is going to ruin it. It’s a case of a big, powerful groundswell completely wrecked by the wind. It’s going to be lumpy and choppy. For a spot like Waimanalo, which is exposed and picks up this ENE swell, the setup is looking more interesting for kite surfing than paddle surfing right now. On Sunday the 6th, the wind stays cross-onshore, but it’s 7 ft from the E with a 13-second period, so the energy is strong.

Now, there is a glimmer of hope. We have to jump ahead to the 9th of September, Wednesday morning. The wind finally drops to a light cross-offshore from the SSE at 12 mph. The swell is 7 ft from the E with a 9-second period, giving moderate energy. The report says the conditions are “clean.” This is easily the best looking window in the whole forecast. The wind is favorable, and the swell is a decent size. But that’s a one-off, because the next day, the 10th, the wind is back on it, and the swell drops to 5 ft. The following week is a long, slow fade. The wind is onshore or cross-onshore, and the swell is small, between 4 ft and 5 ft, with weak energy.

The big standout is that Wednesday morning, the 9th of September. The water temp is about average for the time of year, nothing unusual. If you can wait it out, that morning with the SSE wind offering clean conditions on a 7 ft E swell is your best bet by a long shot. Get on it.

Rusty.

Short Range Forecast

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

Days 5-7 Weather Summary

Light rain (total 5mm), mostly falling on Fri night. Warm (max 26°C on Wed night, min 25°C on Wed night). Mainly strong winds.

Monday
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
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
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2
ENE
7
1.9
ENE
7
1.9
ENE
8
1.9
ENE
8
1.9
ENE
8
2
ENE
8
2
ENE
8
2.1
ENE
8
1.9
ENE
8
2.2
ENE
8
2.2
ENE
8
2.3
ENE
7
2.5
ENE
8
2.5
ENE
8
2.5
ENE
8
2.5
ENE
7
3
ENE
8
2.5
ENE
13
2.5
ENE
8
Wave Graph
Metric surfscale
Energy kJ
352
397
419
419
421
475
471
469
411
526
540
572
763
910
730
764
928
2477
809
Wind (km/h)
40
ENE
35
ENE
35
ENE
30
ENE
30
ENE
35
ENE
30
ENE
35
ENE
35
ENE
35
ENE
45
ENE
45
ENE
45
ENE
45
ENE
40
ENE
40
ENE
30
ENE
30
ENE
30
ENE
Wind State
cross-on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
cross-on
cross-on
cross-on
cross-on
High Tide
4:44AM0.51m
3:57PM0.51m
5:44AM0.52m
4:04PM0.47m
7:03AM0.52m
3:54PM0.43m
9:02AM0.54m
10:54AM0.59m
11:56AM0.64m
Low Tide
10:17PM0.05m
10:16AM0.20m
10:46PM0.03m
11:06AM0.27m
11:19PM0.02m
12:22PM0.33m
00:03AM0.02m
1:10AM0.03m
2:48AM0.04m
4:19AM0.02m
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
rain showers
thunderstorm
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:13
6:13
6:13
6:13
6:15
6:15
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:47
6:47
6:46
6:45
6:45
6:44
6:43
 mm
1
2
2
2
Temp °C
26
26
26
26
25
26
26
26
26
26
25
26
25
26
26
26
26
26
26
Feels °C
24
23
23
23
23
24
24
25
24
24
21
22
20
22
21
23
25
25
25
  • 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 Waimanalo Surf forecast

The above surf forecast table for Waimanalo provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Waimanalo can be found by selecting the local surf guide option on the grey menu. Our Waimanalo 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 (Waimanalo) 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 Waimanalo 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.

Waimanalo is 7 km (4 miles) from 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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