Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 1 pm 29 Jul 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
26.6° 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 30 Jul 2026:

  • Best quality surf: Thursday 30 Jul, 2PM (local time) - 4.5ft (1.4m), 8s period, ENE swell with cross-offshore winds.
  • Most powerful swell: Saturday 1 Aug, 5AM (local time) - 10ft (3.0m), 8s period, E swell with 1,114 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 29 Jul, 11PM (local time) - 4.5ft (1.3m), 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 Wednesday (Jul 29) at 11PM. The primary swell is predicted to be 1.3m and 8s period. 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 3.0m 8s and forecast to arrive on Saturday (Aug 01) at 5AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 7s period and expected on Wednesday (Jul 29) at 11PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)11PM (Wed 29th Jul)4.5ft (1.3m) 8s
Best Surf 2PM (Thu 30th Jul)4.5ft (1.4m) 8s
Most Powerful 5AM (Sat 1st Aug)10ft (3.0m) 8s

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


The Lowdown

Alright, let’s talk about Number Fours. This is a reef break, so it’s got that nice, defined shape when it’s working. It’s fairly consistent, which is a good sign, and it loves swell from the SSE. The water’s sittin’ at about 80°, pretty much what you’d expect for this time of year, no drama there.

The next few days are gonna be a bit of a frustrating mix. We get a taste of something good right off the bat on Wednesday afternoon, the 29th of July. We’ve got a 5ft swell from the ENE, period around 9 seconds, and the wind is glassy from the East at just 3 mph. That’s the kind of clean, smooth surface we all dream about. The energy’s sitting at a moderate 645 – it’s not a monster, but it’s got some push. This is the standout window of the first week.

Don’t get too excited about Thursday the 30th. The morning’s gonna be a mess with a cross-shore wind and questionable conditions. By the afternoon the wind jumps up to 22 mph, which cleans it up but absolutely kills the size, dropping it to 2ft. It does swing around to a long-period 18 seconds from the SSW, but there’s just not enough height to make it work. Friday the 31st and the entire first weekend into Monday the 3rd of August are a write-off for good surfing. We’re looking at strong breezes up to 28 mph, pushing surf over 8ft, which is strictly for the experts, if anyone’s dumb enough to try. The energy hits a strong 1379 on Saturday morning but the wind is relentless, making it a choppy, blown-out mess. Honestly, with those winds and that size on a reef setup, this looks more like a kite surfer’s playground than a paddle surfer’s dream.

Things start to settle down from Monday the 4th of August. Tuesday the 4th is our next real bright spot. Tuesday afternoon, we’ve got a 5ft swell from the ENE, a nice 11-second period, and only a gentle 9 mph cross-off breeze. The energy’s moderate at 554, and the conditions are described as clean. It’s not the biggest, but it’ll be fun and shapely. Then, we hit a dry spell until Monday the 10th of August.

Monday the 10th of August morning is the standout of the entire second week. The swell drops to a very manageable 3ft, but it’s pure groundswell from the SSW with a very long 16-second period. The wind is a gentle 9 mph cross-off. This is where the reef really shines – that long period will wrap in with power and precision. The combined energy is moderate at 580, and it’s expecting very good surf conditions. This is a promising call, but being a week and a half out, keep your fingers crossed. Tuesday the 11th of August will have similar size but a little more cross-shore wind, and the following days fade away into smaller, wind-affected waves.

So, to boil it down: for the first week, Wednesday afternoon the 29th is your best bet for the cleanest, most fun waves. For the second week, circle Monday morning the 10th of August – that long period SSW groundswell could be an absolute gem if the forecast holds.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 27°C on Wed afternoon, min 24°C on Fri night). Winds increasing (calm on Wed afternoon, strong winds from the ENE by Sat morning).

Days 5-7 Weather Summary

Mostly dry. Warm (max 26°C on Sun morning, min 24°C on Sat night). Winds decreasing (strong winds from the ENE on Sat afternoon, light winds from the ENE by Tue morning).

Wed
29
Thursday
30
Friday
31
Saturday
1
Sunday
2
Monday
3
Tuesday
4
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
3
2
1
1
2
0
1
1
0
1
1
1
0
1
0
1
2
2
3
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
ENE
9
1.3
ENE
8
1.5
ENE
8
0.6
SSW
18
1.5
E
7
1.8
ENE
8
2
ENE
8
2.5
E
8
2.5
ENE
8
2.5
ENE
8
2.5
ENE
8
2.5
ENE
8
2.2
ENE
8
1.9
ENE
8
1.6
ENE
8
1.5
ENE
8
1.6
ENE
12
1.5
ENE
11
1.4
ENE
11
1.3
ENE
10
Wave Graph
Metric surfscale
Energy kJ
413
224
250
207
251
375
426
935
939
962
910
864
699
504
353
321
718
553
444
325
Wind (km/h)
5
E
5
NE
15
E
35
ENE
20
ENE
35
ENE
40
ENE
40
ENE
45
ENE
40
ENE
35
ENE
40
ENE
35
ENE
30
ENE
25
ENE
30
ENE
20
ENE
15
ENE
15
NE
15
NE
Wind State
glassy
cross-off
cross
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
4:29PM0.70m
4:28AM0.28m
4:58PM0.68m
5:11AM0.31m
5:26PM0.64m
5:57AM0.34m
5:55PM0.59m
6:49AM0.38m
6:24PM0.52m
7:47AM0.42m
6:55PM0.44m
8:56AM0.47m
7:27PM0.36m
Low Tide
11:34PM0.08m
9:48AM0.03m
11:58PM0.07m
10:29AM0.06m
00:22AM0.06m
11:14AM0.11m
00:48AM0.05m
12:06PM0.16m
1:15AM0.04m
1:14PM0.22m
1:46AM0.04m
2:52PM0.27m
2:23AM0.03m
part cloud
clear
part cloud
clear
clear
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
part cloud
clear
clear
part cloud
cloud
cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:03
6:03
6:03
6:05
6:05
6:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:10
7:10
7:09
7:09
7:08
7:08
7:07
 mm
Temp °C
27
26
27
27
26
26
26
25
25
25
25
26
26
25
26
26
25
26
26
25
Feels °C
30
29
29
28
26
23
23
22
20
20
21
22
22
22
24
24
23
27
27
27
  • 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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