Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 1 pm 03 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: Sunday 6 Sep, 8PM (local time) - 7.5ft (2.3m), 12s period, ENE swell with cross-offshore winds.
  • Most powerful swell: Monday 7 Sep, 8PM (local time) - 15ft (4.5m), 14s period, SSW swell with 8,639 kJ wave energy.
  • Next surfable swell (1★+): Sunday 6 Sep, 8PM (local time) - 7.5ft (2.3m), 12s 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 Sunday (Sep 06) at 8PM. The primary swell is predicted to be 2.3m and 12s period with a secondary swell of 1.8m and 14s. Another secondary swell of 0.5m and 19s is also forecast. 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 4.5m 14s and forecast to arrive on Monday (Sep 07) at 8PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 10s period and expected on Tuesday (Sep 08) at 5AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 8PM (Sun 6th Sep)7.5ft (2.3m) 12s
Best Surf 8PM (Sun 6th Sep)7.5ft (2.3m) 12s
Most Powerful 8PM (Mon 7th Sep)15ft (4.5m) 14s

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


The Lowdown

Alright, Rusty here. Let's check out what Number Fours is dishing up.

To be honest, it's not a golden run, but there are a couple of windows that'll get you out of bed. The water's sitting at 81°F, which is pretty normal for this time of year.

The first little spark is on Saturday, September 5th. You've got a 8ft swell rolling in from the ENE, with a 13-second period – that's real groundswell energy. The combined energy is pumping at (2378), so there's plenty of push. The wind is a cross-off Fresh Breeze, keeping the waves clean. It’s a reef break, so that longer period can really offer up some good lines. It's fairly consistent, so you'll find a few waves.

Now, the main event, and the one that's got my attention, is Monday morning, September 7th. The swell swings around to the SSW, pushing 10ft of swell with a 15-second period. The wave energy jumps to (6186), which is strong. The swell direction is right in the wheelhouse for this exposed reef. The wind is a cross-shore Fresh Breeze, so expect a bit of lumpy texture on the face, but the power underneath will be serious. This one is for the experienced crew only. That 10ft on a reef is not the place for the groms. The afternoon turns into a total mess with onshore winds and 16ft waves – that's kite territory, not for a paddle board.

Things drop right off after that. From the 11th to the 14th, we get some waist-to-chest high ENE swell, around 6ft to 8ft, with a shorter period of 8 to 13 seconds. The winds are clean and cross-off most of that time, so it'll be rideable for a keen surfer, but it's not a standout.

Looking way ahead, Tuesday morning, September 15th, is a long-range keeper. The swell is small, only 3ft, but the period is a monster 21 seconds from the SSW. The energy is still moderate (1448), and the wind is a light cross-off breeze. The report calls it "excellent for experienced surfers." That period is so long it will make that reef stand up and pitch. It's 12 days out, so take it with a grain of salt, but it's a promising sign. The afternoon stays clean with similar 3ft surf at 20 seconds.

The last few days, from the 16th to the 18th, fizzle out into small, clean but weak conditions. Afternoon of the 18th gives a little bump back to 6ft from the ENE, 9-second period and gentle offshores, so it could be a fun little way to finish.

Keep your eyes peeled for that Tuesday pulse, it could be the wave of the period.

Rusty.

Short Range Forecast

Some drizzle, heaviest during Sun morning. Warm (max 26°C on Thu afternoon, min 25°C on Thu afternoon). Mainly strong winds.

Days 5-7 Weather Summary

Heavy rain (total 33mm), heaviest during Sun night. Warm (max 28°C on Tue afternoon, min 23°C on Sun night). Winds decreasing (strong winds from the SSE on Mon night, light winds from the SE by Tue night).

Thu
3
Friday
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
Wednesday
9
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
1
2
2
2
2
2
2
3
4
4
0
0
0
1
2
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)
2.3
ENE
7
2.2
ENE
7
1.3
S
13
1.2
E
14
2.1
E
14
2.2
ENE
13
2.2
ENE
13
2.2
ENE
13
2.1
ENE
12
2.2
ENE
12
2.1
SSW
14
2.5
SSW
15
4
SSW
15
3.5
SW
11
1.6
ENE
11
1.3
ENE
10
0.9
SSW
14
0.9
SSW
14
0.8
E
13
0.8
E
13
Wave Graph
Metric surfscale
Energy kJ
558
487
529
594
1807
1641
1641
1568
1240
1369
1700
3195
6963
2891
550
371
356
273
229
219
Wind (km/h)
40
ENE
35
ENE
35
ENE
35
ENE
30
ENE
30
ENE
30
ENE
25
ENE
25
ENE
20
ENE
25
NE
25
ESE
35
SE
40
S
20
S
15
SSE
5
E
25
ENE
35
ENE
35
ENE
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
cross-on
on
on
on
cross
cross-off
cross-off
cross-off
High Tide
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
2:28PM0.72m
2:51AM0.39m
3:05PM0.69m
3:32AM0.45m
Low Tide
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
7:26AM0.06m
9:22PM0.06m
8:21AM0.06m
9:46PM0.05m
clear
clear
part cloud
clear
clear
clear
clear
part cloud
thunderstorm
mod rain
rain showers
part cloud
part cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
clear
part cloud
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
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:45
6:44
6:43
6:43
6:42
6:40
6:39
 mm
1
8
14
7
2
1
1
Temp °C
26
25
26
26
25
26
26
25
26
26
26
27
27
27
27
28
27
27
27
26
Feels °C
22
21
22
22
22
24
23
24
25
26
25
27
26
25
28
31
31
27
26
25
  • 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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