Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 7 pm 25 Aug 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
27.3°C
0.5° 

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 26 Aug 2026:

  • Best quality surf: Tuesday 1 Sep, 5AM (local time) - 6ft (1.8m), 8s period, ENE swell with cross-offshore winds.
  • Most powerful swell: Thursday 27 Aug, 11AM (local time) - 3.5ft (1.1m), 17s period, S swell with 716 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 1 Sep, 5AM (local time) - 6ft (1.8m), 8s period with ENE swell.

Best Forecast Surf Conditions for Number Fours this week:

The surf forecast for Number Fours over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 01) at 5AM. The primary swell is predicted to be 1.8m and 8s period with a secondary swell of 0.5m and 19s. The wind is predicted to be cross-offshore as the swell arrives.

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 1.4m 6s period and expected on Friday (Aug 28) at 8PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Tue 1st Sep)6ft (1.8m) 8s
Best Surf 5AM (Tue 1st Sep)6ft (1.8m) 8s
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, Rusty here. Let’s get into it.

Right off the bat, Number Fours is the only spot on the radar for this 16-day window, and I won’t lie to you – it’s a tough run. The forecast shows a lot of days with a score of 1 or 0, so we’re looking at a real mixed bag. The good news is that the swell energy is actually quite significant for much of the period, but the wind and conditions are just not cooperating.

The first real sniff of anything worth paddling out for is on the morning of Wednesday, August 27th. We’ve got a 4ft swell coming from the south with a nice long period of 17 seconds. That’s proper groundswell energy with combined energy of 855 (moderate wave energy). The wind is a fresh cross-off from the ENE at 19 mph, which gives us clean waves. It’s not perfect, but it’s the first sign of life. The afternoon drops a little to 3ft, but still clean.

Friday, August 29th, things get a bit bigger. We see a 6ft swell from the ENE on the morning, but the period is a short 7 seconds. That’s windswell, and it’s not going to be the most user-friendly. The combined energy is 540 (moderate wave energy). The wind is still cross-off, so the surf will be clean, but that short period means it’ll be a bit lumpy and less powerful. The afternoon holds at 6ft with the same short period.

The real standout in this whole outlook, and I mean the one that might make it worth the wait, is the afternoon of Monday, September 7th. We’re looking at a 4ft swell from the SSW with a period of 14 seconds. That’s a solid groundswell, and the combined energy jumps to 1179 (strong wave energy). The wind is a gentle breeze from the WNW at 9 mph, and it’s cross-off. That’s nearly glassy, and it’ll make for some really clean, lined-up waves. This is the best on offer.

Before that, there’s a big gap of poor conditions. From August 30th through to September 6th, the scores are consistently 0 or 1. The swell is mostly ENE windswell with a short 7-second period, and the wind is up in the 22-28 mph range. For a reef break like Number Fours, that’s a recipe for a washing machine. The water temp is about average for the time of year, nothing unusual.

The second week is a letdown. From September 3rd to 6th, it’s just poor surf with strong, cross-off winds. The morning of September 7th gives a glimmer with a 3ft SSW swell and a moderate breeze, but the afternoon is the real gem. After that, September 8th sees a 5ft S swell with a 13-second period, but the wind swings to a cross-on, making it choppy. The 9th and 10th are a write-off with onshore winds.

So, if you’re patient, the afternoon of the 7th is your window. It’s a long way out, so the forecast could shift, but as it stands, that’s the one. For the rest, it’s a lot of wind and not much to get excited about.

Rusty.

Short Range Forecast

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

Days 5-7 Weather Summary

Some drizzle, heaviest during Sun night. Warm (max 26°C on Sat morning, min 25°C on Fri night). Mainly strong winds.

Wednesday
26
Thursday
27
Friday
28
Saturday
29
Sunday
30
Monday
31
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
1
0
1
1
1
1
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)
1.6
E
7
0.7
SSW
14
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
0.8
S
13
1.7
ENE
7
1.8
ENE
7
1.6
ENE
7
1.5
ENE
7
1.6
ENE
7
1.7
ENE
7
1.7
ENE
7
1.8
ENE
7
1.9
ENE
8
Wave Graph
Metric surfscale
Energy kJ
236
215
307
351
716
427
482
260
329
229
240
285
237
204
222
262
278
334
476
Wind (km/h)
30
ENE
35
ENE
30
ENE
35
ENE
30
ENE
30
ENE
30
ENE
35
ENE
35
ENE
30
ENE
35
ENE
35
ENE
30
ENE
40
ENE
35
ENE
30
ENE
30
ENE
30
ENE
20
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
High Tide
2:55AM0.33m
3:24PM0.68m
3:31AM0.37m
3:53PM0.66m
4:08AM0.41m
4:20PM0.62m
4:47AM0.46m
4:49PM0.57m
5:30AM0.50m
5:18PM0.51m
6:18AM0.53m
5:48PM0.44m
Low Tide
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
11:22AM0.14m
11:42PM0.05m
12:22PM0.19m
00:10AM0.05m
clear
clear
clear
part cloud
part cloud
clear
clear
part cloud
clear
clear
part cloud
clear
part cloud
clear
clear
rain showers
clear
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:13
6:13
6:13
6:13
6:13
6:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:52
6:52
6:52
6:51
6:50
6:49
6:47
 mm
1
Temp °C
26
26
26
26
26
26
25
26
26
25
26
26
26
26
26
26
26
26
26
Feels °C
24
22
22
24
24
23
23
23
22
23
23
23
23
23
22
25
24
24
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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