Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 1 am 04 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 4 Sep 2026:

  • Best quality surf: Wednesday 9 Sep, 5AM (local time) - 3ft (0.9m), 14s period, SSW swell with cross-offshore winds.
  • Most powerful swell: Monday 7 Sep, 5PM (local time) - 13ft (4.0m), 14s period, SW swell with 6,058 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 9 Sep, 5AM (local time) - 3ft (0.9m), 14s period with SSW 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 (Sep 09) at 5AM. The primary swell is predicted to be 0.9m and 14s 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 4.0m 14s and forecast to arrive on Monday (Sep 07) at 5PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 9s period and expected on Wednesday (Sep 09) at 5AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Wed 9th Sep)3ft (0.9m) 14s
Best Surf 5AM (Wed 9th Sep)3ft (0.9m) 14s
Most Powerful 5PM (Mon 7th Sep)13ft (4.0m) 14s

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


The Lowdown

Looks like Number Fours is the only game in town for the next couple of weeks, and I gotta be honest—it’s a mixed bag. We’ve got some real windows of fun surf, but plenty of days where you’ll be scratching your head. The water’s sitting at a comfortable 27°, which is pretty much average for this time of year, nothing weird going on there.

First up, Friday the 4th of September. The swell’s small, around 1.3m from the S, with a 12-second period and the combined energy reading 1327—moderate energy, nothing to get too excited about. Wind’s a stiff 40 km/h cross-off from the ENE, which will keep things reasonably clean, but the wave comment calls it marginal. Honestly, it’s not doing much for me.

Saturday the 5th bumps up a bit—2.3m from the ENE, period 13 seconds, energy jumping to 2469. Still, the wind is cross-off at 30 km/h and the model’s not rating it. It’s surfable but not a standout. Same story carries through Sunday and into Monday.

Now, Monday the 7th of September morning—this is where it gets interesting. We’ve got 3.0m of swell from the SW, long 15-second period, and the combined energy is 6398—that’s strong wave energy. The wind is cross-shore from the ESE at 20 km/h, and the wave comment says it’s clean-ish but with a cross-chop. This is your best window in the first week, but it’s solidly in the expert-only zone at that size, especially on a reef break. Afternoon blows up to 4.0m with cross-onshore wind—that’s just messy and no good for paddling.

After that, the early part of the second week fades fast. Tuesday the 8th and Wednesday the 9th see the swell drop to 1.5m and under, with onshore winds on Tuesday and light cross-off on Wednesday. Not much happening.

The second week starts to look promising again from around the 13th of September. We get a run of 2.1m to 2.3m from the ENE, with periods around 8 to 9 seconds—so shorter period, more windswell than groundswell. However, the wind stays cross-off and light to moderate, keeping it clean. By Wednesday the 16th of September morning, the forecast calls it “excellent surf conditions for experienced surfers”—2.2m from the ENE, light breeze from ENE at 10 km/h, energy at 1360. That’s a solid session for someone who knows what they’re doing.

The best true standout, though, has to be Wednesday the 16th. Clean conditions, manageable size for intermediates with some experience, and consistent lines. Crowds are “sometimes” a factor here, so you might have company, but with conditions that clean, it’s worth it.

Thursday the 17th brings a change—swell drops to 0.9m but it’s a long-period SSW groundswell at 17 seconds, energy around 1010. That’s the kind of long-period swell that’ll wrap into a reef like Number Fours beautifully, but it’s small. If you’ve got a log, it could be a fun morning.

After that, the final days fade out slowly—1.0m on the 18th and 19th, still with that long SSW period, but again small.

So overall, you’ve got a bit of a wait. The first real highlight is Monday the 7th morning for experts only—big, powerful, but tricky. The best all-round session is Wednesday the 16th. Don’t sleep on Thursday the 17th morning if you want clean little peelers on a longer board.

Keep your eyes on the forecasts, but right now, Number Fours is where it’s at.

Rusty

Short Range Forecast

Moderate rain (total 16mm), heaviest on Sun night. Warm (max 27°C on Sat afternoon, min 25°C on Fri night). Winds decreasing (strong winds from the ENE on Fri morning, light winds from the ENE by Sun night).

Days 4-6 Weather Summary

Moderate rain (total 11mm), heaviest on Mon night. Warm (max 28°C on Mon afternoon, min 25°C on Wed night). Winds decreasing (fresh winds from the S on Mon night, light winds from the E by Tue night).

Friday
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
Wednesday
9
Thursday
10
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
2
2
2
2
2
2
2
3
5
0
0
1
2
2
2
1
1
1
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.3
S
12
1.2
E
14
2.2
E
14
2.3
ENE
13
2.2
ENE
13
2.1
E
13
2.1
ENE
12
1.9
SSW
14
2.2
SSW
14
3
SW
15
4
SW
14
2
ENE
12
1.8
ENE
11
1.5
ENE
10
0.9
SSW
14
0.9
SSW
14
0.8
E
13
1.7
ENE
7
1.6
ENE
7
1.5
ENE
7
1.6
ENE
8
Wave Graph
Metric surfscale
Energy kJ
521
577
1977
1792
1616
1538
1240
1382
1960
4187
6058
1121
773
462
356
273
222
279
247
229
296
Wind (km/h)
40
ENE
35
ENE
30
ENE
30
ENE
30
ENE
25
ENE
35
ENE
25
ENE
25
ENE
20
E
30
SE
35
S
20
S
15
SSE
5
E
25
ENE
25
ENE
35
ENE
35
ENE
30
ENE
30
ENE
Wind State
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross
cross-on
on
on
on
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
10:58AM0.66m
10:35PM0.19m
12:05PM0.69m
00:18AM0.21m
1:00PM0.73m
1:21AM0.26m
1:47PM0.73m
2:09AM0.32m
2:28PM0.72m
2:51AM0.39m
3:05PM0.69m
3:32AM0.45m
3:39PM0.64m
4:11AM0.50m
Low Tide
7:30PM0.17m
3:46AM0.09m
8:03PM0.13m
5:11AM0.08m
8:31PM0.10m
6:25AM0.07m
8:57PM0.08m
7:26AM0.06m
9:22PM0.06m
8:21AM0.06m
9:46PM0.05m
9:12AM0.07m
10:10PM0.04m
clear
clear
clear
clear
clear
part cloud
part cloud
mod rain
thunderstorm
thunderstorm
clear
thunderstorm
thunderstorm
thunderstorm
thunderstorm
clear
clear
part cloud
clear
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:15
6:15
6:16
6:16
6:16
6:16
6:16
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:44
6:43
6:43
6:42
6:40
6:39
6:38
 mm
6
10
2
4
2
2
1
Temp °C
26
26
25
26
27
26
27
26
26
27
28
27
27
27
27
27
27
26
26
26
26
Feels °C
23
22
22
24
25
26
25
26
25
27
27
27
28
29
31
27
26
26
23
22
23
  • 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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