Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 7 am 30 Aug 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
27.1°C
0.3° 

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 30 Aug 2026:

  • Most powerful swell: Saturday 5 Sep, 11PM (local time) - 8ft (2.4m), 13s period, ENE swell with 1,915 kJ wave energy.

Best Forecast Surf Conditions for Number Fours this week:

The most powerful waves expected at Number Fours in the next 16 days are 2.4m 13s and forecast to arrive on Saturday (Sep 05) at 11PM. 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+)--
Best Surf--
Most Powerful11PM (Sat 5th Sep)8ft (2.4m) 13s

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


The Lowdown

Alright folks, it’s Rusty here, and I’ve had a good look at what’s coming our way for Number Fours (reef). Let’s be real, the next 16 days are a bit of a mixed bag. We’ve got a lot of swell pulsing through, but the wind is going to be a constant battle. The water is sitting at about 81°, which is pretty much bang on average for this time of year, so no surprises there.

The forecast kicks off on Sunday the 30th of August, but don’t get too excited. We’re looking at a 7ft swell from the ENE with a short, punchy 7-second period, but that 25 mph ENE cross-off wind is making a mess of things. The energy is moderate (646), but the conditions are just plain poor. That’s going to be the story for the first few days. We’ve got a solid run of 5ft to 7ft ENE swell through Sunday and Monday, but the wind stays strong, so the surf is going to be lumpy and hard to enjoy. It’s a tough start.

Then we get a little shift on Wednesday the 2nd of September. Swell drops right back to 3ft, but it’s a long-period groundswell from the S with a 16-second period. The energy is still moderate (888), but the wind is still a fresh 22 mph cross-off, so it’s a marginal call. It’s a glimmer, but not a standout.

The real story – and the only thing that gets my heart pumping – is the second week. From Monday the 7th of September through to Thursday the 10th, Number Fours is going to be absolutely pumping in size. We’re talking a 13ft ENE swell on Monday afternoon with a very long 12-second period. The energy is through the roof (4946). That’s proper, expert-only territory. If you’re a confident surfer on a reef, this is the window. The wind is the main issue – it’s still strong and cross-off – but on Tuesday the 8th of September morning, we get a brief window of offshore wind from the N at 25 mph. The swell is 10ft with a 9-second period, and it’s clean. It’s going to be a paddle, but the reward will be there. After that, the swell slowly drops, and we’re back to smaller, wind-affected waves through the end of the run.

Honestly, the standout is that Monday the 7th to Wednesday the 9th of September window. The energy is massive, the swell is solid, and if you can pick your moment with the wind, you’ll have a session to remember. Just be aware, this spot can get crowded sometimes, so get in early.

Alright, that’s the reality of it. The first week is a write-off, but the second week holds some serious power. Keep an eye on that wind.

Rusty.

Short Range Forecast

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

Days 4-6 Weather Summary

Light rain (total 2mm), mostly falling on Fri night. Warm (max 27°C on Wed afternoon, min 25°C on Wed night). Winds decreasing (near gales from the ENE on Fri morning, fresh winds from the E by Fri night).

Sunday
30
Monday
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
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
1
0
1
1
0
1
1
1
0
0
0
0
0
0
1
2
2
3
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.9
ENE
7
1.8
ENE
7
1.8
ENE
7
2.1
ENE
7
2
ENE
8
1.9
ENE
8
2
ENE
8
2.1
ENE
8
2.1
ENE
8
0.9
S
16
1.9
ENE
8
2.2
ENE
8
2.4
ENE
7
2.2
ENE
8
3
E
8
3.5
E
8
3
ENE
8
2.5
ENE
8
2.3
ENE
8
2.2
ENE
8
2.2
ENE
13
Wave Graph
Metric surfscale
Energy kJ
358
325
299
432
428
422
463
549
520
422
443
526
574
557
1204
1502
1098
867
686
629
1556
Wind (km/h)
40
ENE
40
ENE
35
ENE
35
ENE
40
ENE
30
ENE
30
ENE
40
ENE
30
ENE
35
ENE
35
ENE
35
ENE
40
ENE
45
ENE
45
ENE
50
ENE
50
ENE
30
E
15
E
20
E
25
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
cross
cross
cross-off
High Tide
5:18PM0.51m
6:18AM0.53m
5:48PM0.44m
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
Low Tide
11:22AM0.14m
11:42PM0.05m
12:22PM0.19m
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
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
rain showers
thunderstorm
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:13
6:13
6:13
6:15
6:15
6:15
6:15
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:49
6:47
6:46
6:45
6:45
6:44
6:43
 mm
2
3
4
5
Temp °C
26
26
25
26
26
25
26
26
25
26
27
26
26
26
25
26
26
26
27
27
27
Feels °C
23
23
23
23
23
22
24
23
22
24
25
24
22
22
21
21
21
21
29
27
29
  • 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 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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