Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 7 pm 27 Jul 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
26.5° C
0.1° 

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 28 Jul 2026:

  • Best quality surf: Wednesday 29 Jul, 2AM (local time) - 8ft (2.5m), 12s period, ENE swell with offshore winds.
  • Most powerful swell: Tuesday 28 Jul, 2PM (local time) - 8ft (2.4m), 13s period, E swell with 1,968 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 29 Jul, 2AM (local time) - 8ft (2.5m), 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 Wednesday (Jul 29) at 2AM. The primary swell is predicted to be 2.5m and 12s period with a secondary swell of 0.6m and 14s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Number Fours in the next 16 days are 2.4m 13s and forecast to arrive on Tuesday (Jul 28) at 2PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.2m 10s period and expected on Wednesday (Jul 29) at 11AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 2AM (Wed 29th Jul)8ft (2.5m) 12s
Best Surf 2AM (Wed 29th Jul)8ft (2.5m) 12s
Most Powerful 2PM (Tue 28th Jul)8ft (2.4m) 13s

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


The Lowdown

Alright, this is Rusty, and I’m looking at the forecast for Number Fours, a reef setup. It’s a bit of a mixed bag, but there’s a couple of windows worth getting excited about.

The wind is mostly cross-off from the northeast, which keeps the surface clean, but the real problem is the swell quality. Through the first week, we’re dealing with a lot of short-period, wind-driven swell from the east and east-northeast. The combined wave energy is moderate to strong (values between 800 and 1300), but the period is sitting at 7 to 8 seconds, so the waves will be lumpy, close together, and lacking that proper push. The water temperature is about average for this time of year, nothing unusual.

The standout here is Tuesday morning, July 28th. We’ve got a solid 7ft easterly swell with a 13-second period, and the combined energy is a very strong 1820 (moderate to strong). The wind is a clean 16 mph cross-off from the northeast. That’s a proper groundswell, and it’ll be lining up nicely on the reef at Number Fours. The direction is a bit east of the optimum SSE, but the power and the clean conditions make it the best on offer for the whole 16-day window. The waves will be a bit much for beginners at that size, but for intermediates, it’s game on. Crowds are possible here, so get in early.

The rest of the period is a bit of a grind. Wednesday, July 29th, the swell drops right off to 2ft, and the wind swings cross-on, so that’s a write-off. From Thursday, July 30th, through to Saturday, August 3rd, we get a run of easterly windswell. The size is there, 5ft to 8ft, but the period is a poor 7-8 seconds. The wind stays strong, 22-31 mph, so it’s going to be messy and blown-out. The wave energy is moderate to strong (650-1300), but the overall quality is low. This setup is more interesting for kite surfing than paddle surfing.

The second week, from Monday, August 4th, to Tuesday, August 12th, sees a drop in size and a change in swell direction. The swell drops to 5ft-8ft from the east-northeast, but the period improves slightly to 10-12 seconds on the 4th, before dropping back again. Then, from August 10th, we get a small, long-period SSW swell, around 3ft to 4ft, with a 14-16 second period. The combined energy is weak (around 500-700). The wind is still strong from the ENE, so it’s clean but the surf is tiny. Not worth a trip.

Honestly, outside of Tuesday morning, July 28th, it’s a waiting game here. The forecast can change, but for now, my advice is to pencil in that Tuesday and hope for the best.

Rusty.

Short Range Forecast

Some drizzle, heaviest during Wed night. Warm (max 27°C on Tue morning, min 25°C on Mon night). Winds decreasing (fresh winds from the NE on Mon night, light winds from the S by Wed night).

Days 5-7 Weather Summary

Mostly dry. Warm (max 26°C on Thu night, min 24°C on Sat night). Winds increasing (moderate winds from the ENE on Thu night, strong winds from the ENE by Sat morning).

Tuesday
28
Wednesday
29
Thursday
30
Friday
31
Saturday
1
Sunday
2
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
4
1
0
0
1
2
2
0
1
1
0
1
1
1
0
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
E
13
2.2
E
13
2.4
E
13
2.5
ENE
12
0.7
S
14
0.7
S
14
1.4
ENE
8
1.6
ENE
8
0.6
SSW
18
1.6
ENE
8
1.7
E
8
2
ENE
7
2.5
E
8
2.5
E
8
2.5
ENE
8
2.3
ENE
8
2.3
ENE
8
2.1
ENE
8
2.1
ENE
8
Wave Graph
Metric surfscale
Energy kJ
1391
1667
1932
1913
195
195
262
287
207
266
329
414
765
816
916
702
686
592
578
Wind (km/h)
25
NE
25
NE
25
NE
15
N
10
SSW
15
SW
15
SSE
25
ENE
15
E
25
ENE
40
ENE
40
ENE
45
ENE
50
ENE
40
ENE
40
ENE
40
ENE
35
ENE
30
ENE
Wind State
cross-off
cross-off
cross-off
off
cross-on
cross-on
cross-on
cross-off
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
3:10AM0.23m
3:59PM0.70m
3:49AM0.25m
4:29PM0.70m
4:28AM0.28m
4:58PM0.68m
5:11AM0.31m
5:26PM0.64m
5:57AM0.34m
5:55PM0.59m
6:49AM0.38m
6:24PM0.52m
Low Tide
10:49PM0.10m
8:31AM0.01m
11:11PM0.09m
9:09AM0.01m
11:34PM0.08m
9:48AM0.03m
11:58PM0.07m
10:29AM0.06m
00:22AM0.06m
11:14AM0.11m
00:48AM0.05m
12:06PM0.16m
1:15AM0.04m
part cloud
clear
clear
part cloud
part cloud
clear
thunderstorm
clear
part cloud
part cloud
part cloud
clear
clear
clear
clear
part cloud
part cloud
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:03
6:03
6:03
6:03
6:03
6:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:12
7:12
7:10
7:10
7:09
7:09
7:08
 mm
1
Temp °C
25
27
27
25
27
27
26
27
27
26
26
26
25
25
26
25
26
26
25
Feels °C
24
27
27
25
29
29
29
26
26
25
25
22
22
20
21
21
22
22
22
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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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