Waimanalo Surf Break

Lat Long: 21.35° N 157.70° W

Waimanalo Surf Forecast and Surf Report

Issued: 7 pm 27 Aug 2026 (local time)

Forecast update in  hr  min

Today's Waimanalo sea temperature is
27.2°C
0.4° 

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


Waimanalo surf forecast from 28 Aug 2026:

  • Most powerful swell: Tuesday 1 Sep, 8PM (local time) - 6ft (1.9m), 8s period, ENE swell with 488 kJ wave energy.

Best Forecast Surf Conditions for Waimanalo this week:

The most powerful waves expected at Waimanalo in the next 16 days are 1.9m 8s and forecast to arrive on Tuesday (Sep 01) at 8PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 16s period and expected on Friday (Aug 28) at 2AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8PM (Tue 1st Sep)6ft (1.9m) 8s

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


The Lowdown

Alright, let’s get into it. Rusty here.

First off, the next week and a half is a grind at Waimanalo. Onshore trades and short-period junk are all we’ve got. The combined wave energy is mostly in the moderate range (222 to 475), so there’s no real push. Water temp is about average for the season.

From Friday, August 28th, through Wednesday, September 9th, it’s a 10-day dry spell. Winds are fresh and onshore or cross-onshore, with swell heights from 5ft to 7ft, but the period is only 6 to 8 seconds. That’s pure windswell – chop city. The report says “poor surf conditions” the whole way, and I’m not arguing.

Things finally change on Thursday, September 10th. The wind drops to a light breeze, and the period bumps to 10 seconds. The morning brings a 5ft swell from the ENE with energy of 641 (moderate), and the afternoon jumps to 8ft from the NE with energy of 1012 (strong). It’s only a 1 out of 10 score, but it’s getting close.

The real standout is Friday, September 11th. Mark it. The morning has a solid 10ft swell from the ENE, 9-second period, and combined energy of 1382 (very strong). Wind is light from the east, cross-onshore but only light, so it’s clean with just small ripples. The score hits 11 out of 10. That’s monster surf – for experts only. At that size, it’ll be powerful and raw, and since Waimanalo is an exposed beach, those long-period waves might section off. The afternoon drops to 8ft and a 2 out of 10, but still worth looking at if you’re solid.

Saturday the 12th drops back to 6ft with 10-second period, but the onshore wind returns.

Bottom line: Ten days of blown-out junk, then one true standout – Friday morning, September 11th. Big, clean, and powerful. Get on it if you’ve got the nerve. Long-range, so keep watching, but it looks like the real deal.

- Rusty

Short Range Forecast

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

Days 5-7 Weather Summary

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

Friday
28
Saturday
29
Sunday
30
Monday
31
Tuesday
1
Wednesday
2
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)
1.5
E
6
1.4
ENE
6
1.4
ENE
6
1.6
ENE
6
1.5
ENE
6
1.7
ENE
6
1.9
ENE
7
1.8
ENE
7
1.8
ENE
7
1.7
ENE
7
2
ENE
7
1.9
ENE
8
1.9
ENE
8
1.7
ENE
8
1.8
ENE
8
1.8
ENE
8
1.8
ENE
8
1.8
ENE
8
1.8
ENE
8
Wave Graph
Metric surfscale
Energy kJ
182
144
118
188
177
226
326
307
316
248
400
419
419
365
444
434
372
372
373
Wind (km/h)
35
ENE
30
ENE
30
ENE
30
ENE
35
ENE
35
ENE
35
ENE
35
ENE
35
ENE
35
ENE
35
ENE
30
ENE
30
ENE
30
ENE
30
ENE
30
ENE
30
ENE
30
ENE
30
ENE
Wind State
cross-on
on
on
cross-on
cross-on
on
cross-on
on
cross-on
cross-on
on
on
on
on
on
cross-on
cross-on
on
cross-on
High Tide
2:22AM0.43m
3:14PM0.63m
3:05AM0.46m
3:30PM0.60m
3:52AM0.48m
3:45PM0.56m
4:44AM0.51m
3:57PM0.51m
5:44AM0.52m
4:04PM0.47m
7:03AM0.52m
3:54PM0.43m
Low Tide
9:08PM0.15m
8:18AM0.02m
9:29PM0.12m
8:54AM0.07m
9:52PM0.09m
9:33AM0.13m
10:17PM0.05m
10:16AM0.20m
10:46PM0.03m
11:06AM0.27m
11:19PM0.02m
12:22PM0.33m
00:03AM0.02m
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:13
6:13
6:13
6:13
6:13
6:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:51
6:50
6:49
6:47
6:47
6:46
6:45
 mm
3
Temp °C
25
25
25
25
25
26
25
25
26
25
26
26
25
26
26
26
26
26
25
Feels °C
22
23
23
22
22
23
22
22
23
22
23
23
22
25
24
25
25
25
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 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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