Kewalos Surf Break

Lat Long: 21.29° N 157.86° W

Kewalos Surf Forecast and Surf Report

Issued: 7 pm 11 Aug 2026 (local time)

Forecast update in  hr  min

Today's Kewalos sea temperature is
27.2° C
0.6° 

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


Kewalos surf forecast from 12 Aug 2026:

  • Best quality surf: Monday 17 Aug, 5AM (local time) - 6.5ft (2.0m), 8s period, ENE swell with cross-offshore winds.
  • Most powerful swell: Sunday 16 Aug, 11AM (local time) - 16ft (5.0m), 11s period, E swell with 5,738 kJ wave energy.
  • Next surfable swell (1★+): Monday 17 Aug, 5AM (local time) - 6.5ft (2.0m), 8s period with ENE swell.

Best Forecast Surf Conditions for Kewalos this week:

The surf forecast for Kewalos over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Aug 17) at 5AM. The primary swell is predicted to be 2.0m and 8s period with a secondary swell of 0.9m and 15s. Another secondary swell of 1.1m and 6s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Kewalos in the next 16 days are 5.0m 11s and forecast to arrive on Sunday (Aug 16) at 11AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Wednesday (Aug 12) at 8PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Mon 17th Aug)6.5ft (2.0m) 8s
Best Surf 5AM (Mon 17th Aug)6.5ft (2.0m) 8s
Most Powerful11AM (Sun 16th Aug)16ft (5.0m) 11s

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


The Lowdown

Alright, Rusty here. Let’s talk about what’s cooking at Kewalos over the next couple of weeks.

Right off the bat, I gotta be straight with you – the first week and a half is a real mixed bag. We’ve got a pulse of energy coming through, but the conditions and the quality are making it tough to get excited. We start off with a clean, long-period south swell on Wednesday the 12th, but it’s small, only 3 feet, and the wind is a fresh cross-offshore from the ENE. The combined energy is moderate (892), and while the waves will be clean, it’s really marginal. This continues through Thursday the 13th, with the swell bumping up just a touch to 4 feet, but the wind is still fresh, and the scores are low.

Then we hit a rough patch. Friday the 14th sees the swell jump up to 7 feet, but the period drops to a short 7 seconds, and the wind is strong. The energy is moderate (867), but the quality is poor. By Saturday the 15th, the swell is a chunky 10 feet from the ENE with a short period, and the wind is a near gale. That’s expert-only territory, and even then, it’s gonna be a washing machine. The combined energy is getting strong (2166), but it’s not surfable. Sunday the 16th is a write-off – a risk of thunderstorms, strong cross-onshore winds, and a huge 16-foot swell with messy conditions. The energy is very strong (6108), but this is kite-surfing stuff, not paddle surfing.

We get a small window of cleaner but still mediocre surf from Monday the 17th to Wednesday the 19th, with waist-to-chest high swell around 5 to 6 feet, but the period is short, and the wind is moderate to fresh. The energy is moderate (1074 down to 237), but the scores are low. It’s just not doing it for me.

After a few days of tiny, poor surf, things finally start to look interesting at the tail end of the forecast. From Sunday the 23rd onward, we see a switch to a clean, long-period SSW groundswell. The swell is small, around 2 feet, but the period is a dreamy 15 to 17 seconds. The big standout is Monday the 24th. The morning is glassy, with 3 feet of SSW swell rolling in with a 13-second period. The combined energy is moderate (488), and the afternoon gets even better, with glassy conditions and the energy climbing to 524. This is the best on offer, no question. It’s clean, small, and perfect for a longboard or a fish. The water temperature is about average for this time of year.

Tuesday the 25th is also promising, with another glassy window in the afternoon and a 2-foot, 15-second SSW swell. The energy is moderate (463). The whole run from the 23rd to the 26th looks like a nice little window of clean, long-period groundswell. It’s a reef break, and that long period will wrap in nicely.

Remember, Kewalos (Big Island) is a consistent, advanced reef break, and it can get crowded, so expect company. The standout is definitely Monday the 24th – glassy, clean, small but with that lovely long-period energy. It’s a rare treat after the messy stuff earlier.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 27°C on Thu morning, min 25°C on Tue night). Mainly fresh winds.

Days 5-7 Weather Summary

Heavy rain (total 37mm), heaviest during Sat night. Warm (max 27°C on Sat afternoon, min 25°C on Fri night). Winds decreasing (gales from the ENE on Sat night, light winds from the E by Sun night).

Wednesday
12
Thursday
13
Friday
14
Saturday
15
Sunday
16
Monday
17
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
1
1
1
1
1
1
0
1
1
0
0
0
0
3
3
1
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.6
S
20
0.9
S
18
0.9
S
18
1
S
16
1
S
16
1.2
S
15
1.1
S
15
2.1
ENE
7
2
ENE
8
2.5
E
8
3
ENE
11
3
ENE
9
3.5
E
9
5
E
11
3
E
9
2.1
ENE
8
1.9
ENE
8
1.8
ENE
8
1.5
ENE
7
Wave Graph
Metric surfscale
Energy kJ
276
509
498
520
501
662
537
444
502
775
1932
1701
1978
5738
1672
621
463
356
231
Wind (km/h)
25
ENE
30
ENE
35
ENE
25
ENE
30
ENE
35
ENE
35
ENE
35
ENE
40
NE
40
NE
45
NE
50
ENE
65
ENE
40
SE
25
SE
10
E
20
ENE
30
ENE
25
NE
Wind State
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-on
cross-on
cross
cross-off
cross-off
cross-off
High Tide
3:43AM0.31m
4:13PM0.75m
4:30AM0.36m
4:48PM0.69m
5:17AM0.40m
5:22PM0.62m
6:06AM0.44m
5:54PM0.53m
6:57AM0.47m
6:24PM0.45m
7:54AM0.49m
6:52PM0.37m
Low Tide
10:40PM0.05m
9:08AM-0.00m
11:08PM0.04m
9:58AM0.03m
11:36PM0.04m
10:49AM0.08m
00:03AM0.04m
11:43AM0.14m
00:30AM0.05m
12:43PM0.20m
00:58AM0.06m
1:59PM0.25m
1:27AM0.08m
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:07
6:09
6:09
6:09
6:09
6:09
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:04
7:02
7:02
7:01
7:00
7:00
7:00
 mm
1
20
8
5
3
Temp °C
26
26
26
25
27
27
25
26
27
25
26
27
26
26
27
26
27
26
25
Feels °C
25
24
23
23
24
24
23
23
24
22
23
23
22
24
26
27
28
26
24
  • 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 Kewalos Surf forecast

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

Kewalos is 5 km (3 miles) from Honolulu. If you plan a vacation in Oahu, look for hotels and other accommodation in Honolulu. Honolulu has rooms for a wide range of budgets as well as car hire and transport links.

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