Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 1 pm 28 Aug 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
27.3°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 29 Aug 2026:

  • Most powerful swell: Tuesday 1 Sep, 5PM (local time) - 7ft (2.1m), 8s period, ENE swell with 569 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 8s and forecast to arrive on Tuesday (Sep 01) at 5PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 8s period and expected on Wednesday (Sep 02) at 5PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 5PM (Tue 1st Sep)7ft (2.1m) 8s

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


The Lowdown

Alright, Rusty here. Let’s have a look at what Number Fours has in store for us.

Alright, mate, the honest truth is it’s a bit of a slow start for Number Fours. The swell is there, but the wind is just blowing straight across the face from the ENE for the entire first week, making it hard to get anything really clean. The wave energy is moderate, around 474 (kilojoules per square metre) on the first day, but the quality just isn’t matching up. The water is a warm 81.1°, which is pretty normal for this time of year, so at least you’ll be comfortable waiting.

We’ve got a long gap of poor to marginal conditions from Friday the 28th of August all the way through most of the first week. The swell climbs up to around 6.6 ft with a short, weak period of 7-8 seconds, but that cross-off wind just ruins it. It’s not until Monday the 7th of September that the energy really starts to build, hitting 1590 to 1834, with a 7.5 ft to 7.9 ft swell from the ENE, finally getting a longer 11-second period. The wind is still cross-off, but the power is there. It's still only a marginal call though.

Now, the real standout is Wednesday the 9th of September. The morning is looking like the pick of the whole outlook. The swell hits 8.2 ft from the ENE with a combined energy of 1119, and the wind drops right back to a gentle cross-off breeze from the NE, just 9 mph. The forecast is calling it excellent surf conditions for experienced surfers. That’s a big swell, over 8 ft, so this is definitely not for beginners. This is for the crew who can handle some power. The period is only 8 seconds, so it’s not a long drawn-out groundswell, but the combination of size and light wind should make for some proper, punchy waves.

After that, the energy eases back into the marginal zone through the 10th and 11th of September, with the wind swinging around to the WSW on the 11th, creating some cross-chop. The last couple of days, the 12th of September, look poor again with a fading, short-period swell and light onshore winds.

So, bottom line: the first week is a write-off for quality. Punch the clock for Wednesday the 9th of September. Get there early for the cleanest conditions. It’s going to be big and powerful, but with that light NE wind, it could be a magic morning. There will be crowds, as the spot sometimes gets busy. Don’t sleep on it.

Stay salty.

Short Range Forecast

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

Days 5-7 Weather Summary

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

Fri
28
Saturday
29
Sunday
30
Monday
31
Tuesday
1
Wednesday
2
Thursday
3
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
1
0
0
0
0
0
1
0
1
1
1
1
1
0
0
1
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)
0.9
S
14
0.8
S
13
1.5
ENE
6
1.5
ENE
7
2
ENE
7
1.9
ENE
7
1.9
ENE
7
1.8
ENE
7
2
ENE
7
1.9
ENE
8
2.1
ENE
8
2.1
ENE
8
2.1
ENE
8
2
ENE
8
0.9
S
16
0.8
S
16
1.9
ENE
8
1.7
ENE
8
1.6
ENE
8
1.6
ENE
8
Wave Graph
Metric surfscale
Energy kJ
329
229
172
189
371
336
348
303
400
430
481
520
569
499
422
322
441
361
322
310
Wind (km/h)
35
ENE
30
ENE
35
ENE
35
ENE
35
ENE
35
ENE
40
ENE
35
ENE
35
ENE
35
ENE
30
ENE
35
ENE
35
ENE
30
ENE
35
ENE
30
ENE
30
ENE
30
ENE
25
ENE
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-off
cross-off
cross-off
High Tide
4:20PM0.62m
4:47AM0.46m
4:49PM0.57m
5:30AM0.50m
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
Low Tide
10:54PM0.07m
10:31AM0.10m
11:17PM0.05m
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
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:13
6:13
6:13
6:13
6:15
6:15
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:51
6:50
6:49
6:47
6:46
6:45
6:45
 mm
Temp °C
26
25
26
26
25
26
26
25
26
26
25
26
26
25
26
26
25
26
26
25
Feels °C
23
22
23
23
22
22
22
22
23
23
22
24
24
23
24
23
23
24
24
23
  • 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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