Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 7 pm 23 Jul 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
26.7° 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 24 Jul 2026:

  • Best quality surf: Wednesday 29 Jul, 8AM (local time) - 11ft (3.5m), 11s period, ENE swell with offshore winds.
  • Most powerful swell: Wednesday 29 Jul, 8AM (local time) - 11ft (3.5m), 11s period, ENE swell with 3,131 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 29 Jul, 8AM (local time) - 11ft (3.5m), 11s 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 Wednesday (Jul 29) at 8AM. The primary swell is predicted to be 3.5m and 11s period with a secondary swell of 0.7m and 14s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Number Fours in the next 16 days are 3.5m 11s and forecast to arrive on Wednesday (Jul 29) at 8AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.2m 8s period and expected on Saturday (Jul 25) at 11PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Wed 29th Jul)11ft (3.5m) 11s
Best Surf 8AM (Wed 29th Jul)11ft (3.5m) 11s
Most Powerful 8AM (Wed 29th Jul)11ft (3.5m) 11s

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


The Lowdown

Alright folks, Rusty here. Let’s get into it.

Number Fours is a reef setup that’s exposed to the swell, so when it gets a clean line, it can really fire. This whole 16-day window is a bit of a mixed bag though. We’ve got a solid run of swell, but a lot of it comes wrapped in strong cross-offshore winds that keep the surface clean, but the conditions are often described as marginal. The first few days are a write-off for quality surfing, so we’re looking at a bit of a slow start.

The first real hopeful sign pops up on Sunday, July 26th. We’ve got a long period groundswell rolling in from the SSW at 3 ft, with a period of 16 seconds. That’s a proper long period, which will give the reef at Number Fours some nice, lined-up waves, but with that period, it can be a bit straight at times. The wind is a cross-off from the ENE at 19 mph, keeping things clean. The combined energy is strong (1245).

The standout of the whole run has to be Wednesday, July 29th. That morning, a big pulse of swell hits, with a solid 12 ft from the ENE, period of 11 seconds. The wind is light from the north-northeast at only 9 mph, a gentle breeze. That’s about as good as it gets for a reef – a big, powerful groundswell with light winds. The combined energy is massive (2727). This is definitely for experienced surfers only, as 12 ft is well into expert territory. The afternoon turns ugly, though, with a cross-onshore wind and choppy conditions, so the morning window is the one to chase.

After that, the swell drops back, but we get a few more days of manageable, clean surf in the 3 ft to 6 ft range. The wind stays cross-off, but it’s pretty strong, so the wave quality remains just okay. The period drops to 7-8 seconds, which is short period windswell, so the waves will be a bit weaker and more crumbly.

Then there’s a bit of a lull, with a few days of poor surf ratings. Things pick up again on Sunday, August 2nd, with a return of a long period, 16-second swell from the east at 4 ft. The combined energy is strong (1105). The wind is still a stiff cross-off at 22 mph, so it’ll be clean but a bit bumpy. This pattern of clean, modest swell continues through the first week of August, with the standout being a steady 6 ft pulse from the ENE on Wednesday, August 5th, with a decent 12-second period, and moderate cross-off winds. The combined energy is moderate (1023).

The very end of the forecast, on Saturday, August 8th, sees a tiny, long period SSW groundswell of 2 ft with a 19-second period, but the wind goes cross-shore, and the energy is weak (255). It’s a small, tricky day.

Overall, if you’re a confident surfer, the morning of July 29th is the absolute standout. It’s a big, powerful, clean swell. For the more consistent, everyday surfer, the period from August 2nd through to August 6th offers the best mix of clean, rideable surf with moderate crowds possible at Number Fours. The rest of the window is mostly about waiting for the right tide and the cleanest window.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 26°C on Sat afternoon, min 24°C on Thu night). Mainly strong winds.

Days 5-7 Weather Summary

Light rain (total 8mm), mostly falling on Wed morning. Warm (max 27°C on Tue afternoon, min 24°C on Sun night). Mainly fresh winds.

Friday
24
Saturday
25
Sunday
26
Monday
27
Tuesday
28
Wednesday
29
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
1
1
2
1
1
2
2
2
2
2
1
3
2
2
2
3
0
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
SSW
18
2.2
ENE
7
2
ENE
7
2.2
ENE
7
1.8
ENE
8
0.9
SSW
18
2.1
ENE
8
1.9
ENE
8
1
E
14
1.1
E
14
1.2
E
14
1.2
E
13
1.7
E
13
1.8
E
12
1.9
E
12
3
ENE
12
3.5
ENE
11
2.5
ENE
10
2
ENE
8
Wave Graph
Metric surfscale
Energy kJ
464
499
428
512
392
572
547
469
407
472
515
485
946
957
1118
2281
2523
1170
541
Wind (km/h)
35
ENE
40
ENE
35
ENE
35
ENE
35
ENE
35
ENE
35
ENE
30
ENE
30
ENE
30
ENE
25
ENE
35
ENE
20
NE
25
NE
35
NE
25
NE
15
NNE
25
SE
10
E
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-on
cross
High Tide
11:46PM0.19m
1:44PM0.62m
00:59AM0.18m
2:22PM0.66m
1:51AM0.19m
2:56PM0.68m
2:32AM0.21m
3:29PM0.70m
3:10AM0.23m
3:59PM0.70m
3:49AM0.25m
4:29PM0.70m
4:28AM0.28m
Low Tide
9:13PM0.17m
5:34AM0.05m
9:41PM0.14m
6:23AM0.04m
10:05PM0.12m
7:08AM0.02m
10:27PM0.11m
7:51AM0.01m
10:49PM0.10m
8:31AM0.01m
11:11PM0.09m
9:09AM0.01m
11:34PM0.08m
clear
clear
clear
clear
clear
part cloud
part cloud
clear
clear
part cloud
clear
clear
clear
part cloud
clear
part cloud
thunderstorm
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:01
6:01
6:01
6:01
6:03
6:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:14
7:13
7:13
7:13
7:12
7:12
7:10
 mm
4
4
8
Temp °C
25
25
25
25
25
26
25
25
25
25
25
26
25
26
27
25
26
26
26
Feels °C
22
21
21
22
22
23
22
23
22
22
22
24
23
25
26
24
29
27
26
  • Map Icons:
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  • 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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