Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 7 am 11 Sep 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
27.2°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 11 Sep 2026:

  • Most powerful swell: Thursday 17 Sep, 8PM (local time) - 7ft (2.2m), 10s period, ENE swell with 862 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 2.2m 10s and forecast to arrive on Thursday (Sep 17) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Wednesday (Sep 16) at 11AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8PM (Thu 17th Sep)7ft (2.2m) 10s

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


The Lowdown

Right folks, Rusty here. Let's have a squiz at what Number Fours has got cookin' over the next couple of weeks.

Overall, we're looking at a pretty drawn-out run of small, messy, and frankly frustrating surf for Number Fours. There's a lot of waiting ahead. The first week and a half is dominated by onshore-ish cross-off winds and mostly knee-to-waist high slop. It's not gonna get you excited.

The water's sitting at 81°, which is pretty much bang on average for this time of year, so no surprises there.

We've got a long gap at the start. The first few days, from Friday the 11th of September through to at least the middle of the following week, are all poor to marginal. The energy is weak to moderate at best, and the wind is a persistent cross-off from the ENE, not the ideal SSE direction this reef needs. The swell is tiny and mixed up.

The first real chance of a pulse arrives mid-week. On Thursday the 17th of September morning, the swell jumps to 7ft from the ENE, but the period is a short, wonky 8 seconds. The combined energy shoots up into the strong zone, but that short period will mean lumpy, sectiony waves. It's a step up in size, but the quality isn't there. The wind remains a tricky cross-off. By Thursday afternoon it's still 7ft, but with a 10-second period. It's bigger, but you're fighting the wind.

The real standout, the one you've been waiting for, is Friday the 25th of September. The morning session is the absolute pick of the whole forecast. We get a solid 7ft of east swell, with a clean 10-second period, delivering nice moderate energy. The wind goes light and cross-off from the east, which for a SSE-facing reef like Number Fours (exposed) means clean, groomed faces. This is proper overhead, with decent shape. It's rated for experienced surfers and it'll be a legit, rippable wave. The only bummer is this spot can get crowded, so expect some company in the water for that one.

After that, it fades back down. Saturday the 26th is still rideable at 6ft with cleaner winds, but the magic of the 25th morning is gone.

So, to boil it down: don't bother for the first week. The light at the end of the tunnel is the morning of Friday the 25th of September. That's your window. Set the alarm.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 26°C on Fri morning, min 24°C on Fri night). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Warm (max 27°C on Tue afternoon, min 25°C on Mon morning). Winds increasing (light winds from the NE on Mon night, fresh winds from the ENE by Wed morning).

Friday
11
Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
0
1
1
1
0
0
0
0
0
0
1
1
0
1
0
1
1
1
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.3
ENE
11
1
ENE
11
1.1
ENE
10
0.7
SW
15
0.8
ENE
10
0.7
ENE
9
0.5
SW
15
0.4
SSW
15
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
2.1
ENE
10
2.1
ENE
9
Wave Graph
Metric surfscale
Energy kJ
387
249
245
242
125
84
107
84
38
86
227
224
392
384
470
455
541
429
629
788
675
Wind (km/h)
25
ENE
25
ENE
20
ENE
20
ENE
15
ENE
15
ENE
20
ENE
15
NE
20
NE
25
ENE
30
NE
20
NE
20
ENE
30
ENE
30
ENE
40
ENE
35
NE
35
ENE
35
ENE
35
NE
35
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
cross-off
cross-off
High Tide
4:12PM0.57m
4:51AM0.54m
4:42PM0.50m
5:31AM0.57m
5:11PM0.43m
6:14AM0.58m
5:40PM0.36m
7:02AM0.58m
6:07PM0.30m
7:59AM0.57m
6:32PM0.25m
9:10AM0.56m
7:25PM0.21m
Low Tide
10:02AM0.10m
10:33PM0.04m
10:52AM0.13m
10:56PM0.05m
11:45AM0.17m
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
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
part cloud
part cloud
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:16
6:16
6:16
6:18
6:18
6:18
6:18
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:37
6:37
6:36
6:35
6:34
6:32
6:31
 mm
Temp °C
26
26
25
26
26
25
26
26
25
25
26
25
26
27
26
26
27
26
26
27
26
Feels °C
25
25
25
26
25
25
26
25
25
24
24
24
27
27
25
25
25
25
25
25
25
  • 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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