Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 7 am 01 Sep 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
27.1°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 2 Sep 2026:

  • Most powerful swell: Saturday 5 Sep, 11PM (local time) - 8ft (2.4m), 14s period, ENE swell with 2,079 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 2.4m 14s and forecast to arrive on Saturday (Sep 05) at 11PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 10s period and expected on Saturday (Sep 05) at 8PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11PM (Sat 5th Sep)8ft (2.4m) 14s

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


The Lowdown

Alright folks, Rusty here. Let’s have a look at what Number Fours has in store for us.

The next 16 days are a bit of a mixed bag at Number Fours. We’re looking at a long stretch of so-so conditions, where the wind is mostly cross-offshore from the ENE, but the main issue is that it’s just too blustery to get clean, workable lines for most of the period. The water temp is sitting at 81°, which is pretty much normal for this time of year, so no surprises there.

We kick off on Tuesday, 1st September, with a 6ft ENE swell, but it’s short-period at 8 seconds and the wind is a fresh 19 mph cross-off. The energy is weak (841), so it’s not really doing much. The morning is a bit more promising than the afternoon, but it’s still marginal. Wednesday and Thursday are more of the same—the swell builds to 7ft, but the wind picks up to 25 mph, making it a messy, blown-out affair. The energy is moderate (up to 1363), but with that wind, it’s not going to be a fun paddle.

The first real standout comes on Saturday, 5th September. The swell drops slightly to 7ft, but the period jumps to 13 seconds—that’s proper groundswell energy. The wind eases to 19 mph, and the energy is strong (2063). This is a big blob of power, but those long-period swells can be a bit tricky at a reef break like Number Fours, making the waves a bit too straight. Still, if you’re an intermediate, this is the best of the first week. Sunday, 6th September, is similar but with a touch less wind at 16 mph—very clean, but still those long-period lines.

The 8th of September brings a weird shift: a 5ft SSW swell from the south with a very long 15-second period. The energy is still strong (2210), but the wind is a light cross-shore from the ESE. That’s a tricky combo for this break, and the wave comment mentions it’s marginal. Not a standout.

The real wall of water arrives on Friday, 11th September, through to Saturday, 12th September. Friday morning sees 10ft ENE swell, building to 12ft by afternoon, with a moderate 12 mph cross-off. The energy is strong (2411). Saturday, 12th September, is the peak: 13ft of ENE swell with a 10-second period, and only 9-12 mph offshore winds. The energy is very strong (4164). This is only for experts—over 8ft is serious business. If you’re skilled and hungry, Saturday morning looks like the best session of the whole outlook, with clean, powerful waves. After that, it all drops off a cliff. From Sunday, 13th September, onward, the swell collapses to 2ft or less, with weak energy (below 150), and it’s flat and poor for the rest of the window.

So, the pick of the litter is Saturday, 12th September, with that 13ft ENE swell and clean winds. The earlier Saturday, 5th September, is a decent second option for those who want a solid but not life-threatening session. If you’re not an expert, stay away from the 12th.

Rusty, signing off.

Short Range Forecast

Mostly dry. Warm (max 27°C on Tue afternoon, min 25°C on Tue night). Mainly strong winds.

Days 4-6 Weather Summary

Mostly dry. Warm (max 27°C on Sat afternoon, min 25°C on Fri morning). Winds decreasing (strong winds from the ENE on Fri morning, light winds from the ENE by Sun night).

Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
Monday
7
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
0
2
0
0
1
1
1
1
1
1
2
2
2
3
2
2
3
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)
1.8
ENE
8
1.9
ENE
8
2.2
ENE
8
2.1
ENE
8
2
ENE
8
2.5
ENE
8
2.2
ENE
7
2.5
ENE
8
2.4
ENE
8
2.5
ENE
8
2.2
ENE
8
1.3
E
14
2.1
ENE
13
2.2
ENE
13
2.3
ENE
13
2.2
ENE
13
2.1
ENE
12
2.1
ENE
12
2.1
ENE
12
1.9
ENE
12
1.8
ENE
11
Wave Graph
Metric surfscale
Energy kJ
402
453
574
520
502
828
500
789
640
675
526
649
1496
1630
1804
1485
1220
1200
1220
937
828
Wind (km/h)
30
NE
35
NE
30
ENE
40
ENE
40
ENE
40
ENE
40
ENE
45
ENE
40
ENE
40
ENE
35
ENE
35
ENE
35
ENE
30
ENE
20
NE
25
ENE
30
NE
20
ENE
20
E
20
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
cross-off
cross-on
High Tide
6:20PM0.36m
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
1:40PM0.23m
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
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
part cloud
part cloud
clear
clear
part cloud
part cloud
cloud
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:13
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
Temp °C
26
27
26
26
26
25
26
26
25
26
26
25
26
27
26
27
27
26
27
27
26
Feels °C
24
25
24
24
22
22
22
22
21
21
21
21
24
25
25
27
26
26
28
28
27
  • 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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