Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 1 am 30 Jul 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
26.7° C
0.3° 

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 30 Jul 2026:

  • Best quality surf: Thursday 30 Jul, 8AM (local time) - 4.5ft (1.4m), 8s period, ENE swell with cross-offshore winds.
  • Most powerful swell: Saturday 1 Aug, 5AM (local time) - 10ft (3.0m), 8s period, ENE swell with 1,055 kJ wave energy.
  • Next surfable swell (1★+): Thursday 30 Jul, 8AM (local time) - 4.5ft (1.4m), 8s 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 Thursday (Jul 30) at 8AM. The primary swell is predicted to be 1.4m and 8s period with a secondary swell of 0.7m 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 3.0m 8s and forecast to arrive on Saturday (Aug 01) at 5AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 5s period and expected on Thursday (Aug 06) at 8AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Thu 30th Jul)4.5ft (1.4m) 8s
Best Surf 8AM (Thu 30th Jul)4.5ft (1.4m) 8s
Most Powerful 5AM (Sat 1st Aug)10ft (3.0m) 8s

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


The Lowdown

Alright folks, Rusty here. Let’s get into it. We’re lookin’ at Number Fours, a reef setup that’s gonna take a bit of patience over the next 16 days. The water’s sittin’ at 80°, pretty much normal for this time of year, so no surprises there.

The pattern opens with a bit of a flat spell, but the first real chance to get wet comes on Thursday, the 30th of July. We’ve got a morning window with 5ft swell from the ENE, period bang on 8 seconds, and a cross-off wind from the ENE at 16 mph. Combined energy’s moderate (583). It’s labeled as marginal, but for a reef break that loves a SSE direction, this ENE swell isn’t ideal. Still, it’s the best we’ve got on the table. The afternoon drops off quick to a tiny 2ft SSW groundswell with a long 18 second period – that’s a lot of energy for such a small wave, but it’s a long wait between sets.

Friday the 31st sees a jump in size to 6ft, same E/ENE direction, period still short at 8 seconds, but the wind is up to 25 mph. That’s a strong breeze, and with the cross-off, it’s gonna be a bumpy, blown-out mess. The combined energy climbs well into the moderate range (847), but the conditions are poor. Saturday the 1st of August pushes into 8ft swell from the E, but with 28 mph winds, that’s only for the brave or the kites. The energy is strong (1338), but the surface is gonna be a washing machine.

Sunday the 2nd holds around 8ft, still with that fresh ENE breeze at 22 mph. The wave quality just isn’t there for a decent paddle. This trend of big, windy, poor-quality surf continues right through to Monday the 3rd and Tuesday the 4th. The standout in this early part is probably Tuesday the 4th afternoon. The swell drops to 5ft from the ENE, period lengthens to 11 seconds, and the wind eases to a gentle breeze at 9 mph from the NE. The combined energy is still moderate (560), and it’s marginal, but conditions are the cleanest we’ve seen.

Wednesday the 5th of August morning is the best bet in the whole outlook. It’s the only session the finder mentions as “expect good surf conditions.” Swell sits at 4ft from the ENE, period 10 seconds, with a gentle breeze at 9 mph. It’s clean, it’s manageable, and the crowds are possible at this spot. It’s not a huge day, but it’s the one I’d be paddling out for.

Beyond that, we hit a proper flat spell. Thursday the 6th through the 8th are mostly poor, with small, short-period windswell and fresh winds. There’s a tease on Sunday the 9th with a 2ft S swell at 19 seconds – very long period, but way too small. Then Monday the 10th of August morning brings a risk of thunderstorms, but a 3ft SSW swell with a 16 second period, moderate breeze, and a combined energy of 1124. That’s a lot of energy for a small wave, but the long period could make it fat and lined up on the reef. The afternoon that day brings a cross-shore wind, so it’ll be a bit bumpy.

The rest of the second week, from the 11th onward, is a mix of small, marginal SSW groundswells and then more ENE windswell, but the wind is too strong and the quality is poor. Nothing worth chasing.

To sum it up: Wednesday the 5th of August morning is the clear standout – clean, small but fun, and the only session labeled “good.” Tuesday the 4th afternoon is the runner-up for a cleaner afternoon session. Everything else is a battle with the wind or just too small to bother.

Stay patient, and keep an eye on the sky.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 27°C on Thu morning, min 24°C on Fri night). Winds increasing (light winds from the NE on Thu morning, strong winds from the ENE by Sat morning).

Days 4-6 Weather Summary

Mostly dry. Warm (max 26°C on Sun morning, min 24°C on Sun night). Winds decreasing (fresh winds from the ENE on Sun morning, light winds from the ENE by Tue night).

Thursday
30
Friday
31
Saturday
1
Sunday
2
Monday
3
Tuesday
4
Wednesday
5
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
1
2
0
1
1
0
1
1
1
0
1
1
1
1
2
2
2
2
1
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.5
ENE
8
0.6
SSW
18
1.5
E
7
1.7
E
8
1.8
ENE
8
3
E
8
2.5
E
8
2.5
ENE
8
3
ENE
8
2.3
ENE
8
2.2
ENE
8
2
ENE
8
1.7
ENE
8
1.5
ENE
8
1.3
ENE
9
1.5
ENE
12
1.4
ENE
11
1.3
ENE
10
1.2
ENE
10
1.1
ENE
9
1
ENE
8
Wave Graph
Metric surfscale
Energy kJ
250
207
251
329
385
1033
902
939
1009
720
682
554
394
321
237
583
452
345
248
184
147
Wind (km/h)
25
ENE
25
ENE
25
ENE
40
ENE
40
ENE
40
ENE
45
ENE
40
ENE
40
ENE
35
ENE
35
ENE
30
ENE
30
ENE
30
ENE
20
NE
20
ENE
15
NE
10
ENE
15
ENE
20
ENE
15
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-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
4:58PM0.68m
5:11AM0.31m
5:26PM0.64m
5:57AM0.34m
5:55PM0.59m
6:49AM0.38m
6:24PM0.52m
7:47AM0.42m
6:55PM0.44m
8:56AM0.47m
7:27PM0.36m
10:11AM0.53m
8:07PM0.29m
Low Tide
9:48AM0.03m
11:58PM0.07m
10:29AM0.06m
00:22AM0.06m
11:14AM0.11m
00:48AM0.05m
12:06PM0.16m
1:15AM0.04m
1:14PM0.22m
1:46AM0.04m
2:52PM0.27m
2:23AM0.03m
5:19PM0.27m
3:10AM0.03m
clear
clear
part cloud
clear
part cloud
part cloud
part cloud
clear
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:03
6:03
6:03
6:05
6:05
6:05
6:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:10
7:09
7:09
7:08
7:08
7:07
7:07
 mm
Temp °C
27
27
26
26
26
25
25
25
25
26
26
25
25
26
25
26
26
25
26
27
26
Feels °C
27
27
26
23
22
21
20
20
21
23
23
22
24
24
24
27
27
26
28
28
27
  • 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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