Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 7 pm 01 Sep 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
27.2°C
0.3° 

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 2 Sep 2026:

  • Best quality surf: Monday 7 Sep, 11AM (local time) - 8ft (2.4m), 13s period, ENE swell with cross-offshore winds.
  • Most powerful swell: Tuesday 8 Sep, 11AM (local time) - 10ft (3.0m), 14s period, SW swell with 3,067 kJ wave energy.
  • Next surfable swell (1★+): Monday 7 Sep, 5AM (local time) - 8ft (2.4m), 13s 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 Monday (Sep 07) at 5AM. The primary swell is predicted to be 2.4m and 13s period with a secondary swell of 1.3m and 12s. 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 14s and forecast to arrive on Tuesday (Sep 08) at 11AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 11s period and expected on Saturday (Sep 05) at 8AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Mon 7th Sep)8ft (2.4m) 13s
Best Surf11AM (Mon 7th Sep)8ft (2.4m) 13s
Most Powerful11AM (Tue 8th Sep)10ft (3.0m) 14s

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


The Lowdown

Alright folks, Rusty here, with a look at what Number Fours has in store for the next couple of weeks.

Number Fours is our main man for this forecast period. We’re going to see a bit of a patience game early on, but there’s some real magic brewing for the true-blue surfers later.

Right now, the first few days are a write-off for decent surfin’. We’ve got a solid ENE breeze, howling at 25 mph, which is making a mess of things even though we’re seeing some swell around 7 ft from the ENE. The wave energy is pretty weak, sitting at (992), and with a short, bumpy period of just 8 seconds, it’s just not happening. This rubbish wind and lumpy surf is going to hang around right through to the end of the 3rd of September.

Things start to get a bit more interesting on Thursday afternoon, the 4th. The swell eases a touch, but the period jumps to a proper 14 seconds. The energy is building into the moderate range (1482). The wind is still a cross-off from the ENE at 22 mph, which is a bit strong, but it’s clean. It’s marginal, but you might find a rare clean one if you’re desperate.

The real standout, the one you’ve been waiting for, is Monday morning, the 7th of September. The stars are finally aligning. The wind drops right back to a gentle 9 mph breeze from the NE, staying cross-off and clean. The swell is still a solid 8 ft from the ENE, but now with a long 13-second period and a hefty wave energy of (3269). This is prime for experienced surfers. It won’t be easy out there, but the waves will have proper shape and power. Expect some crowd chatter though, as it’s often busy when it's good. This is the window to aim for.

After that morning, the wind picks back up a bit through Monday and into Tuesday, and we get a weird, lumpy SW swell on the 8th that’s all over the shop. We get a bit of a lull in quality for a few days after that with strong breezes and short-period slop.

Then, hold onto your boards, because from the 13th of September onwards, it gets real interesting again. The winds go super light – we’re talking 6 mph light breezes from the NE. On the morning of the 14th, we get a nice 7 ft S swell with moderate energy (1001). The conditions will be glassy and clean. Then, later in the week, we get a super long-period groundswell from the southwest on the 15th and 16th, with periods hitting 18 to 21 seconds. This is for the connoisseurs. The energy is strong (1201-1477), but with such a long period, Number Fours, being a reef break, should handle it beautifully, offering up some long, powerful lines. It might be a bit much for beginners, but for everyone else, it’s a dream.

So, in short, the surf at Number Fours is a slow burn. Don’t bother with the first week. Hold out for the morning of the 7th of September as a cracker, and then the second week from the 13th onwards really delivers the goods with light winds and solid, clean swell.

Rusty, signing off.

Short Range Forecast

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

Days 5-7 Weather Summary

Moderate rain (total 11mm), heaviest on Mon morning. Warm (max 27°C on Sat afternoon, min 23°C on Mon morning). Winds decreasing (strong winds from the ENE on Fri night, light winds from the E by Mon morning).

Wednesday
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
Monday
7
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
0
0
1
0
1
1
1
1
2
2
2
3
3
3
3
5
4
3
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.1
ENE
8
2.1
ENE
8
2
ENE
8
2.5
ENE
8
2.1
ENE
7
2.5
E
8
2.4
ENE
8
2.3
ENE
7
2.2
ENE
8
1.4
E
14
2.3
ENE
14
2.3
ENE
13
2.4
ENE
13
2.3
ENE
13
2.3
ENE
12
2.4
ENE
12
2.4
ENE
13
2.3
ENE
12
2.3
SW
14
Wave Graph
Metric surfscale
Energy kJ
527
520
502
711
456
717
623
543
553
711
1846
1804
1930
1610
1485
1697
1787
1581
2111
Wind (km/h)
30
ENE
40
ENE
40
ENE
40
ENE
40
ENE
45
ENE
40
ENE
40
ENE
35
NE
35
ENE
30
ENE
30
ENE
20
ENE
25
ENE
25
ENE
15
ENE
15
NE
25
ENE
15
ESE
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
High Tide
8:21AM0.59m
6:54PM0.28m
9:39AM0.62m
7:57PM0.22m
10:58AM0.66m
10:35PM0.19m
12:05PM0.69m
00:18AM0.21m
1:00PM0.73m
1:21AM0.26m
1:47PM0.73m
2:09AM0.32m
Low Tide
00:43AM0.05m
3:38PM0.25m
1:25AM0.06m
6:22PM0.22m
2:24AM0.08m
7:30PM0.17m
3:46AM0.09m
8:03PM0.13m
5:11AM0.08m
8:31PM0.10m
6:25AM0.07m
8:57PM0.08m
rain showers
part cloud
clear
clear
clear
clear
clear
part cloud
clear
part cloud
clear
clear
part cloud
clear
clear
thunderstorm
mod rain
light rain
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:15
6:15
6:15
6:15
6:16
6:16
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:46
6:45
6:45
6:44
6:43
6:43
6:42
 mm
1
2
8
1
4
Temp °C
26
26
26
25
26
26
25
26
26
26
26
27
26
27
27
26
23
26
26
Feels °C
24
25
23
22
23
22
21
22
22
24
24
25
25
27
26
26
26
26
26
  • 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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