Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 7 pm 13 Sep 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
27.3°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 14 Sep 2026:

  • Most powerful swell: Thursday 17 Sep, 2PM (local time) - 7ft (2.1m), 10s period, ENE swell with 811 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 2.1m 10s and forecast to arrive on Thursday (Sep 17) at 2PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Wednesday (Sep 16) at 5PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2PM (Thu 17th Sep)7ft (2.1m) 10s

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


The Lowdown

Hey everyone, Rusty here, checking in on Number Fours for the next couple of weeks.

Alright, let's be straight – the next while is a tough one. We've got a real long stretch of surf that just can't get its act together. The wind is mostly cross-off, which keeps it clean, but the wave quality just isn't there to make a session worthwhile.

We kick off on Monday the 14th with tiny, weak 1ft swell from the SW. The energy is pretty weak, and with a period over 20 seconds, it's a long-period groundswell, but there’s just no power behind it. Tuesday and Wednesday are more of the same, with swell getting up to about 3ft, but the scores are still pointing to marginal surf. It’s clean, but it’s not doing anything for anyone.

Then Thursday the 17th gets interesting, but not in a good way. The swell jumps to over 7ft, but it's a short-period 8-second windswell from the ENE. The energy gets up there, but that short period means it’s going to be a bouncy, unpredictable mess at this reef. An experienced surfer might find a wave, but the quality is gone.

Friday the 18th has a clean 3ft SSW groundswell with a long 17-second period and strong energy, but the wind goes cross-shore and puts a nasty chop on the surface. The next few days are all that same story: 6-7ft of short-period windswell with a fresh breeze. It's just not happening.

The one real highlight, and the only time I'd bother to paddle out, is Thursday the 17th afternoon. It’s a short-period swell, sure, but at over 6ft, coming from the ENE and with strong energy, it’s got some real grunt. The cross-off wind keeps the surface clean. It’s the best score in the whole run, and for a short window, Number Fours will have some serious, clean power. Don't miss that afternoon.

After that, it’s a long, frustrating stretch right through to the end of the period. Swell stays in the 5-7ft range, but it's almost all that short-period windswell. The wind is relentless, blowing 20-25 mph, keeping everything messy. By the last few days of September, the energy drops right off, and it’s back to a non-event.

Honestly, this is a rough outlook. A long run of ‘almost but not quite’. That Thursday 17th afternoon is your only real shot. If you can’t make it, you’re better off waiting. Forecasts can turn, but this one's a grind.

Rusty.

Short Range Forecast

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

Days 5-7 Weather Summary

Moderate rain (total 14mm), heaviest on Thu night. Warm (max 27°C on Thu afternoon, min 26°C on Wed night). Mainly fresh winds.

Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
1
1
1
0
1
1
1
1
1
2
2
2
0
2
1
1
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.4
SW
12
0.3
SW
23
0.5
SW
22
0.5
SW
21
0.7
SW
20
0.7
SW
19
0.8
SSW
19
0.9
SW
18
0.9
SSW
18
0.9
SW
17
2.2
ENE
8
2
ENE
9
1
SSW
18
1
SSW
17
1
SSW
17
1
SSW
16
1.9
ENE
8
1.9
ENE
8
2.2
E
8
Wave Graph
Metric surfscale
Energy kJ
38
86
227
224
392
384
470
455
541
429
525
637
644
622
580
539
473
449
581
Wind (km/h)
15
NE
25
ENE
25
ENE
20
ENE
20
ENE
25
ENE
25
ENE
30
NE
30
NE
30
NE
35
ENE
25
ENE
30
ENE
30
ENE
25
E
25
ENE
25
ENE
35
ENE
30
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
cross-off
cross-off
cross-off
cross-off
High Tide
6:14AM0.58m
5:40PM0.36m
7:02AM0.58m
6:07PM0.30m
7:59AM0.57m
6:32PM0.25m
9:10AM0.56m
7:25PM0.21m
10:27AM0.57m
11:01PM0.21m
11:34AM0.59m
00:19AM0.23m
Low Tide
11:19PM0.06m
12:45PM0.20m
11:42PM0.08m
2:03PM0.23m
00:07AM0.11m
4:06PM0.24m
00:38AM0.13m
7:14PM0.21m
1:26AM0.16m
7:23PM0.18m
2:56AM0.18m
7:43PM0.16m
4:35AM0.17m
clear
clear
clear
part cloud
part cloud
clear
clear
clear
clear
part cloud
part cloud
thunderstorm
thunderstorm
clear
clear
thunderstorm
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:18
6:18
6:18
6:18
6:18
6:18
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:36
6:35
6:34
6:32
6:31
6:30
6:30
 mm
3
9
2
Temp °C
26
26
27
26
27
27
26
27
27
26
26
27
26
27
27
26
26
27
26
Feels °C
26
25
26
27
28
27
26
27
26
26
25
27
26
25
25
26
26
25
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 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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