Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 7 am 23 Aug 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
27.2°C
0.4° 

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 23 Aug 2026:

  • Most powerful swell: Thursday 27 Aug, 11AM (local time) - 3.5ft (1.1m), 17s period, S swell with 716 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 1.1m 17s and forecast to arrive on Thursday (Aug 27) at 11AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 7s period and expected on Friday (Aug 28) at 2AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11AM (Thu 27th Aug)3.5ft (1.1m) 17s

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


The Lowdown

Alright folks, Rusty here. Let’s have a look at what Number Fours has in store for us over the next couple of weeks. It’s a bit of a mixed bag, so we need to be patient.

Right now, the pattern is locked into a steady cross-off wind from the ENE, blowing at 18-25 mph, which is clean but not ideal. The water temperature is sitting at 81°, which is about average for this time of year, so no need to dig out the 5/4 just yet.

The first few days are a write-off for any decent surf. Sunday the 23rd and Monday the 24th are poor, with messy, short-period swell around 5 ft to 7 ft from the ENE, period a weak 7 seconds. The combined energy is moderate (around 500-577), but it’s just not coming together. Tuesday the 25th sees a slight bump in size to 7 ft, but again, that 7-second period and cross-off wind make for poor conditions. This continues through to Saturday the 29th – nothing worth paddling out for.

We hit a bit of a lull on Sunday the 30th and Monday the 31st, with tiny waves dropping to 2 ft to 3 ft. The energy is low (372-397) and the period is a bit better on some southerly swells (16 seconds), but it’s just not enough to get excited about.

Now, the first real standout appears on Tuesday, September 1st. We get a glassy, clean morning with a moderate breeze from the NE at 16 mph. The swell is small, only 3 ft, but it’s a long-period groundswell from the SSW at 18 seconds. The combined energy is strong (828), and that long period will wrap nicely into this reef. The water is still warm, and the wind is light. This is a sneaky good morning for a log or a mid-length if you can find the right bank.

The next big moment is on Wednesday, September 2nd. The swell jumps up to 7 ft to 7 ft from the ENE, with a period that’s improved to 8 seconds. The energy is very strong (1267), but the wind is still a fresh cross-off at 22 mph. This is where it gets powerful. At 7 ft, this is getting into expert territory, especially if the wind stays up. It’s still a bit messy, but there’s push.

The real charm, though, is Saturday, September 5th. Morning has a moderate breeze from the ENE at 12 mph, with a solid 7 ft swell from the ENE but a period of 11 seconds. The energy is strong (1197). This is a proper groundswell pulse. The reef at Number Fours should handle this beautifully, with longer, more powerful sets. The wind is still offshore enough to keep it clean. This is the best on offer for the intermediate and above crew.

Then we get to Sunday, September 6th morning. The swell is 8 ft from the ENE, period 11 seconds, and energy is very strong (1707). But the wind is a direct cross-shore from the E at 12 mph, creating a moderate cross-chop. That’s going to make it bumpy and tricky. At 8 ft, this is only for experts, and the chop will make it a handful. The afternoon drops to 2 ft from the SSW, which is a total change.

The real gem of the whole forecast is Monday, September 7th. The morning is glassy – wind from the E at just 3 mph, with a 3 ft SSW groundswell at 16 seconds. The combined energy is moderate (387), but the glassy conditions will make this a dream. The afternoon picks up to 5 ft from the ENE at 9 seconds, still with light wind. This is the best all-round day for everyone who can handle a bit of a wall. That long-period swell on the reef will be super clean.

So, to sum it up: the first week is a write-off. The standout days are the morning of Tuesday, September 1st for the small, clean log session, and the morning of Saturday, September 5th for the punchy, longer-period groundswell. The absolute best is Monday, September 7th – glassy, clean, and with a nice mix of swells. Keep your eyes on that one.

Rusty.

Short Range Forecast

Light rain (total 2mm), mostly falling on Mon night. Warm (max 27°C on Sun afternoon, min 24°C on Tue night). Mainly strong winds.

Days 4-6 Weather Summary

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

Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
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
1
0
0
0
0
0
1
1
1
1
1
1
1
0
1
1
0
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.8
ENE
7
2
ENE
7
1.9
ENE
7
1.7
ENE
7
1.6
ENE
7
1.6
ENE
7
2.1
E
7
1.8
ENE
7
1.7
ENE
7
1.6
ENE
7
0.7
S
18
0.7
S
19
1.1
S
17
0.9
S
16
1
S
16
0.8
S
14
0.9
S
14
1.8
ENE
7
1.6
ENE
7
1.5
ENE
7
1.6
ENE
7
Wave Graph
Metric surfscale
Energy kJ
295
349
307
277
247
254
457
346
277
239
307
351
716
427
482
260
329
299
219
192
214
Wind (km/h)
35
NE
40
ENE
35
ENE
35
ENE
30
ENE
30
ENE
35
ENE
35
ENE
35
ENE
35
ENE
35
ENE
30
ENE
30
ENE
30
ENE
30
ENE
30
ENE
35
ENE
35
ENE
35
ENE
35
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-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
1:52PM0.66m
1:46AM0.26m
2:26PM0.67m
2:21AM0.29m
2:56PM0.68m
2:55AM0.33m
3:24PM0.68m
3:31AM0.37m
3:53PM0.66m
4:08AM0.41m
4:20PM0.62m
4:47AM0.46m
4:49PM0.57m
Low Tide
9:18PM0.14m
6:59AM0.08m
9:35PM0.13m
7:43AM0.06m
9:53PM0.11m
8:24AM0.05m
10:12PM0.10m
9:05AM0.06m
10:32PM0.08m
9:46AM0.07m
10:54PM0.07m
10:31AM0.10m
11:17PM0.05m
clear
clear
clear
clear
clear
thunderstorm
clear
clear
part cloud
clear
clear
clear
part cloud
clear
clear
clear
clear
part cloud
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:11
6:11
6:11
6:13
6:13
6:13
6:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:54
6:53
6:52
6:52
6:52
6:51
6:50
 mm
2
Temp °C
26
27
26
27
27
26
26
26
25
26
26
25
26
26
25
26
26
25
26
26
25
Feels °C
25
25
24
25
26
26
23
23
23
23
24
22
23
24
23
24
23
23
23
23
21
  • 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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