Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 1 pm 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 5 Sep 2026:

  • Best quality surf: Monday 7 Sep, 2AM (local time) - 7ft (2.1m), 12s period, ENE swell with cross-offshore winds.
  • Most powerful swell: Monday 7 Sep, 8PM (local time) - 11ft (3.5m), 14s period, SW swell with 4,395 kJ wave energy.
  • Next surfable swell (1★+): Monday 7 Sep, 2AM (local time) - 7ft (2.1m), 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 Monday (Sep 07) at 2AM. The primary swell is predicted to be 2.1m and 12s period with a secondary swell of 1.6m and 14s. 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 3.5m 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 1.7m 11s period and expected on Tuesday (Sep 08) at 11AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 2AM (Mon 7th Sep)7ft (2.1m) 12s
Best Surf 2AM (Mon 7th Sep)7ft (2.1m) 12s
Most Powerful 8PM (Mon 7th Sep)11ft (3.5m) 14s

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


The Lowdown

Right then, let’s have a look at what’s on the cards for Number Fours, a reef break. The water's sitting at 81°F right now, which is bang on average for this time of year – nothing unusual there.

Honestly, the next few days are a bit of a write-off. We've got some swell, but the conditions are just not playing ball. The wind is a stubborn cross-off from the ENE, blowing at 19 mph, and it's making things messy. The surf is there, around 4 ft to 7 ft from the east, but the quality is poor. It’s just not coming together. You'll be battling a stiff breeze for a wave that's not worth the fight. This stretch of poor surf runs from the 4th right through to the 6th.

Saturday the 7th starts to look a bit more interesting, but it's a bit of a mixed bag. The morning shows a 7 ft swell from the southwest with a 14-second period, carrying a solid moderate energy (3372). The wind is a straight cross-shore, not ideal but not terrible. It’s worth a look first thing. But then the afternoon turns nasty with a risk of thunderstorms and a 8 ft southwest swell (4835 energy) – that’s strong wave energy, but it’s a cross-onshore chop and a big stormy mess. That’s for the experts only, if anyone's silly enough to go out.

The whole of the next week, from the 8th to the 13th, is a real struggle. The wind stays on it, and the surf is either too small, too choppy, or just plain poor. The combined swell energy drops right off, and we’re looking at a lot of days with poor to marginal conditions. It’s a proper lull.

Now, keep your eyes on Monday the 14th. The morning has a 7 ft swell from the east-northeast, and the wind drops right back to a gentle 9 mph breeze. The forecast says "expect very good surf conditions" – that’s a standout. The combined energy is moderate (643), and with that light wind, it should be clean. This is the best bet on offer for the next fortnight.

After that, the swell drops right back to tiny 2 ft to 3 ft waves from the south-southwest. The period gets long, up to 21 seconds, which is a proper groundswell, but there’s just not enough height to do anything with it. The wind stays a firm cross-off, so it’ll be clean but tiny.

Hold on, though. Towards the end of the run, on Saturday the 19th, we get a real glimmer of hope. The afternoon shows a 7 ft east-northeast swell with a 9-second period, and the wind drops to a whisper – just 3 mph. It’s described as "excellent surf conditions for experienced surfers" (1180 energy). The swell direction matches the optimum for this reef, and the wind is light and cross-off, so it’s going to be glassy. It’s a long way out, so don't book the time off just yet, but mark it in your calendar. That’s the one to watch.

Rusty.

Short Range Forecast

Light rain (total 9mm), mostly falling on Sun night. Warm (max 27°C on Sat afternoon, min 25°C on Fri night). Mainly fresh winds.

Days 5-7 Weather Summary

Moderate rain (total 11mm), heaviest on Mon night. Warm (max 27°C on Mon afternoon, min 25°C on Wed night). Winds increasing (light winds from the SE on Tue night, fresh winds from the ENE by Wed night).

Fri
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
Wednesday
9
Thursday
10
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
2
2
2
3
2
3
4
3
0
0
0
1
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)
1.2
E
14
2.1
E
14
2
E
13
2.1
ENE
13
2.1
E
13
1.9
ENE
12
1.8
ENE
12
2.1
ENE
12
2
SW
14
2.5
SW
15
3.5
SSW
12
1.8
ENE
11
1.6
ENE
10
0.9
SSW
14
0.9
SSW
14
0.8
SSW
13
1.5
ENE
7
1.8
ENE
7
1.7
ENE
7
1.5
ENE
7
Wave Graph
Metric surfscale
Energy kJ
577
1807
1465
1474
1538
1100
960
1200
1536
3059
3566
802
530
289
273
204
242
321
281
249
Wind (km/h)
30
ENE
30
NE
30
ENE
30
NE
20
ENE
30
ENE
25
ENE
15
ENE
20
E
25
SE
30
SSE
25
S
15
S
5
SE
15
ENE
30
ENE
35
ENE
25
ENE
35
ENE
25
ENE
Wind State
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross
cross-on
cross-on
on
on
cross-on
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
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
part cloud
part cloud
cloud
mod rain
rain showers
rain showers
thunderstorm
thunderstorm
thunderstorm
clear
rain showers
clear
part cloud
part cloud
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
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
8
1
2
4
2
2
1
Temp °C
26
25
26
27
25
26
26
26
27
27
27
27
27
27
27
27
26
26
26
25
Feels °C
22
23
24
25
25
25
25
26
28
26
27
28
28
31
29
26
26
25
23
22
  • 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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