Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 1 pm 13 Aug 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
27.2° 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 14 Aug 2026:

  • Most powerful swell: Sunday 16 Aug, 2AM (local time) - 15ft (4.5m), 10s period, E swell with 3,303 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 4.5m 10s and forecast to arrive on Sunday (Aug 16) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 7s period and expected on Wednesday (Aug 19) at 11PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2AM (Sun 16th Aug)15ft (4.5m) 10s

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


The Lowdown

Alright folks, Rusty here. Let’s have a yarn about Number Fours over the next couple of weeks.

The next few days are a bit of a write-off for decent waves. We get a pulse of swell, but the wind is just too strong out of the east-northeast, making a mess of things. It’s not until the very back end of the second week that things start to look interesting.

The standout window is around Saturday the 22nd and Sunday the 23rd of August. We've got a long period groundswell pushing in from the southwest with periods around 15-16 seconds, which is proper energy for this reef setup. The combined swell energy sits around 466-476 on the Saturday (moderate) and drops a little by Sunday. Swell heights are tiny though, only 2ft to 2ft from the SSW-SW. But the wind turns it on. Saturday afternoon has a light breeze and Sunday morning goes glassy with 3 mph winds from the southeast. That’s about as clean as it gets. For a break like Number Fours, this is a proper specialty session for the longboard or a fish; small, but with that long period from the southwest, it’ll peel nicely down the reef. The water temperature is sitting around 81°F, which is normal for the time of year, so no surprises there.

Before that, it’s a grind. From the 13th right through to the 21st, the conditions are mostly blown out. There’s a massive spike in energy on the 15th with a 13ft short-period swell from the ENE and a combined energy of 2575 (strong to very strong), but it’s accompanied by a near gale. That’s more of a kite-surfing situation than anything else, too messy for a good paddle.

After the good weekend, the winds pick back up from the 24th, and while there’s some size around in the final few days of August—like a 5ft east swell on the 28th with a period of 16 seconds and combined energy climbing to 1815 (strong)—the cross-off winds are still a factor. That Friday the 28th is shaping up as a decent session for a bigger board; the wind is down to a moderate breeze and that long period from the east will wrap in nicely to Number Fours. It’s a solid option for the end of the run but not as clean as that magically glassy Sunday.

If you’re keen on a session, pencil in the 22nd and 23rd for the most chance of a silky, uncrowded wave. After that, the last couple of days of August look promising but are still a way off, so keep an eye on it.

Rusty.

Short Range Forecast

Heavy rain (total 34mm), heaviest during Sun morning. Warm (max 27°C on Fri afternoon, min 25°C on Thu night). Winds increasing (fresh winds from the ENE on Thu night, near gales from the ENE by Sat night).

Days 5-7 Weather Summary

Moderate rain (total 17mm), heaviest on Sun afternoon. Warm (max 27°C on Sun afternoon, min 25°C on Sun night). Mainly fresh winds.

Thu
13
Friday
14
Saturday
15
Sunday
16
Monday
17
Tuesday
18
Wednesday
19
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
1
0
1
0
0
0
1
2
2
1
1
0
0
0
0
1
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)
1.2
S
15
1.1
S
15
2.2
ENE
8
2.1
ENE
7
3
ENE
8
3.5
ENE
9
4
ENE
9
4.5
E
10
3.5
E
9
2.3
ENE
8
2.1
ENE
8
1.6
ENE
8
0.8
S
14
1.5
ENE
7
1.3
ENE
7
1.4
ENE
7
1.3
ENE
7
1.1
ENE
8
1.2
ENE
7
1
E
8
Wave Graph
Metric surfscale
Energy kJ
662
537
540
482
976
1830
2327
3303
1768
719
547
276
257
225
167
188
158
149
144
129
Wind (km/h)
35
ENE
35
ENE
35
ENE
40
ENE
40
ENE
50
ENE
55
ENE
55
ENE
35
E
20
E
20
ENE
30
ENE
30
ENE
30
ENE
30
ENE
30
ENE
25
ENE
25
ENE
25
ENE
20
NE
Wind State
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
4:48PM0.69m
5:17AM0.40m
5:22PM0.62m
6:06AM0.44m
5:54PM0.53m
6:57AM0.47m
6:24PM0.45m
7:54AM0.49m
6:52PM0.37m
8:59AM0.51m
7:16PM0.30m
10:13AM0.53m
Low Tide
11:36PM0.04m
10:49AM0.08m
00:03AM0.04m
11:43AM0.14m
00:30AM0.05m
12:43PM0.20m
00:58AM0.06m
1:59PM0.25m
1:27AM0.08m
3:56PM0.27m
2:01AM0.10m
2:47AM0.12m
clear
clear
clear
clear
clear
clear
part cloud
rain showers
thunderstorm
thunderstorm
thunderstorm
rain showers
part cloud
part cloud
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:09
6:09
6:09
6:09
6:09
6:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:02
7:01
7:00
7:00
7:00
6:59
6:58
 mm
1
33
8
8
1
Temp °C
26
25
26
27
25
26
26
26
25
27
26
26
26
25
25
26
25
25
26
25
Feels °C
23
23
22
24
22
22
21
21
21
28
27
25
25
23
23
23
24
24
25
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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