Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 7 pm 31 Aug 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
27.1°C
0.2° 

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


Number Fours surf forecast from 1 Sep 2026:

  • Best quality surf: Monday 7 Sep, 11PM (local time) - 7ft (2.2m), 12s period, ENE swell with cross-offshore winds.
  • Most powerful swell: Sunday 6 Sep, 2AM (local time) - 7ft (2.2m), 13s period, ENE swell with 1,592 kJ wave energy.
  • Next surfable swell (1★+): Monday 7 Sep, 11PM (local time) - 7ft (2.2m), 12s period with ENE swell.

Best Forecast Surf Conditions for Number Fours this week:

The surf forecast for Number Fours over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Sep 07) at 11PM. The primary swell is predicted to be 2.2m and 12s period with a secondary swell of 1.0m and 15s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Number Fours in the next 16 days are 2.2m 13s and forecast to arrive on Sunday (Sep 06) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)11PM (Mon 7th Sep)7ft (2.2m) 12s
Best Surf11PM (Mon 7th Sep)7ft (2.2m) 12s
Most Powerful 2AM (Sun 6th Sep)7ft (2.2m) 13s

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


The Lowdown

Alright folks, Rusty here. Let’s get into it. We’ve got Number Fours on the radar for the next couple of weeks, and it’s a bit of a mixed bag. The first week is all about size, but the wind is gonna be the main character. The second week looks like a serious drop-off.

Right out of the gate, Tuesday morning the 1st of September, we’ve got a solid 6ft swell from the ENE, with a period of 8 seconds. The wind is a cross-off from the NE at 19 mph, which is a good look for this reef. It’s clean, but it’s a bit marginal. The water temp is about average for this time of year, nothing wild.

The big story is the swell building through the first week. By Wednesday morning the 2nd, we’re looking at 7ft, and it just keeps punching up. The combined energy is climbing too, hitting 1043 (moderate) on Wednesday and jumping to 1181 (moderate) by Thursday morning the 3rd, with the swell holding at 8ft. That’s a lot of water moving. The wind stays cross-off from the ENE, but it’s a fresh to strong breeze, blowing 25 mph. It’s manageable, but it’s not what you’d call glassy.

The standout moment comes in on Saturday the 5th. The swell drops slightly to 7ft, but the period jumps to 13 seconds. That’s a proper groundswell. The combined energy surges to 1874 (strong) on Saturday morning, and even higher, 2062 (strong), in the afternoon. This is the best of the bunch. The wind backs off to a fresh breeze of 19 mph, still cross-off. The waves will have more energy, better shape, and longer waits between sets. For a reef setup like Number Fours, that long period is a gift. This is the one to circle on the calendar.

Sunday the 6th is still excellent, with the swell around 7ft and a 13-second period. The wind eases further to a moderate breeze of 12 mph, making for the cleanest conditions of the whole run. The combined energy is still strong at 2051. Monday the 7th holds on too, but the wind goes a bit cross, so the surface won’t be as silky.

After that, it starts to fade. The swell size drops through the second week, and the period gets shorter. By Wednesday the 10th, the energy plummets to 526 (weak), and the conditions are poor. There’s a long gap of several days where the surf is minimal or just not worth the paddle. The 11th through the 16th are mostly small, weak, or blown out. There’s a brief pulse of 5ft ENE swell on the 12th, but it’s cross-shore with a chop. Not great.

So, the bottom line: Get it while it’s good. The first weekend, especially Saturday the 5th and Sunday the 6th, is your best bet. Big, long-period groundswell with clean, cross-off wind. It’s going to be a bit of a wait for the sets, but the shape will be worth it. After that, the surf disappears for a while. Forecasts like this can change, but right now, that first week is the only real game in town.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 27°C on Tue afternoon, min 25°C on Mon night). Mainly strong winds.

Days 5-7 Weather Summary

Mostly dry. Warm (max 28°C on Sun afternoon, min 25°C on Thu night). Winds decreasing (strong winds from the ENE on Thu night, light winds from the NE by Sat night).

Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
0
1
1
0
1
1
1
1
1
1
1
2
2
3
3
3
3
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
8
1.9
ENE
8
1.9
ENE
8
2.1
ENE
8
2.2
ENE
8
2
ENE
8
2.5
ENE
8
2.5
E
8
2.5
ENE
8
2.5
ENE
8
2.4
ENE
8
2.2
ENE
8
2.1
ENE
7
2
ENE
13
2.1
ENE
13
2.2
ENE
13
2.2
ENE
13
2.1
ENE
12
2.1
ENE
12
Wave Graph
Metric surfscale
Energy kJ
439
432
464
507
572
502
768
854
663
785
611
514
426
1299
1445
1592
1497
1240
1211
Wind (km/h)
35
ENE
30
NE
35
ENE
35
ENE
40
ENE
40
ENE
40
ENE
40
ENE
40
ENE
40
ENE
40
ENE
35
ENE
35
ENE
30
ENE
30
ENE
20
NE
20
ENE
25
NE
20
ENE
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-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
7:14AM0.56m
6:20PM0.36m
8:21AM0.59m
6:54PM0.28m
9:39AM0.62m
7:57PM0.22m
10:58AM0.66m
10:35PM0.19m
12:05PM0.69m
00:18AM0.21m
1:00PM0.73m
1:21AM0.26m
Low Tide
00:10AM0.05m
1:40PM0.23m
00:43AM0.05m
3:38PM0.25m
1:25AM0.06m
6:22PM0.22m
2:24AM0.08m
7:30PM0.17m
3:46AM0.09m
8:03PM0.13m
5:11AM0.08m
8:31PM0.10m
part cloud
clear
clear
part cloud
part cloud
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:13
6:15
6:15
6:15
6:15
6:16
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:47
6:46
6:45
6:45
6:44
6:43
6:43
 mm
Temp °C
26
26
27
26
26
26
26
26
26
25
26
26
25
26
27
26
27
28
26
Feels °C
23
24
25
24
24
22
23
23
22
21
22
22
21
24
25
26
27
28
27
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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 Number Fours Surf forecast

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

Number Fours 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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