Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 7 am 16 Jul 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
26.4° 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 16 Jul 2026:

  • Most powerful swell: Wednesday 22 Jul, 11PM (local time) - 2.5ft (0.7m), 22s period, SSW swell with 489 kJ wave energy.

Best Forecast Surf Conditions for Number Fours this week:

The most powerful waves expected at Number Fours in the next 16 days are 0.7m 22s and forecast to arrive on Wednesday (Jul 22) at 11PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 7s period and expected on Thursday (Jul 16) at 2PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11PM (Wed 22nd Jul)2.5ft (0.7m) 22s

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


The Lowdown

Alright, let’s talk Number Fours. The next week and a half is a real slow burn, with nothing much to write home about until way late in the forecast. The water is sitting at a normal 80°, so no surprises there.

The first few days are a total bust. Thursday the 16th through Sunday the 19th, we’ve got tiny waves and a stiff cross-off breeze. The waves are clean but tiny – 2ft to 5ft of short-period windswell from the ENE, with a period of 7 seconds. That’s useless for a reef. The combined energy is weak to moderate (288 to 442), and it’s all poor surf. Don’t even think about it.

Monday the 20th and Tuesday the 21st show a little more promise. The swell drops to 3ft to 3ft, but it’s coming from the S with a longer period of 14 to 16 seconds – that’s proper groundswell. The energy picks up a bit (376 to 593), but the scores are still marginal. The wind is still cross-off from the ENE, so it’s clean but small. Not worth the drive.

Then we hit a dry spell. From Wednesday the 22nd through to Sunday the 27th, the swell builds but the conditions never line up. You’ll see the energy climb from moderate into strong territory (660 up to 2678), and the wave size gets bigger – 4ft to 6ft by the 26th and 27th. The period is solid too, 13 to 17 seconds. But the wind stays stubbornly cross-off from the ENE, sometimes hitting a strong breeze. The forecasts are all marginal. It’s a tease.

Now, here’s the real deal. Monday the 28th of July is the standout. This is a big, powerful swell. Monday morning we’re looking at 10ft from the ENE with a 15-second period, and the combined energy is a massive 4895 – that’s very strong. Monday afternoon it gets even bigger: 12ft from the ENE, period 15 seconds, energy hitting 6148. This is serious groundswell. The wind is cross-off from the NE, moderate to fresh breeze, so it’ll be clean. But at 10ft to 12ft, this is expert-only territory. That’s big for a reef. Beginners, stay on the sand. The long period means it’ll have heaps of punch and long waits between sets. At Number Fours, a reef break, that’s a good thing – it’ll hold its shape. It’s the best on offer, but you need to be on your A-game.

Tuesday the 29th of July morning is another highlight. The swell drops right back to 3ft from the S, period 13 seconds, but the wind goes light from the E at 6 mph. That’s a light breeze, almost glassy. The energy is moderate (339). Then Tuesday afternoon gets even better: the wind goes glassy – 3 mph from the ENE, true glass. The swell is 3ft from the ENE, period 9 seconds. It’s small and clean, perfect for a longboard or a funboard. The crowd factor at Number Fours is “sometimes,” so you might see a few heads, but on a Tuesday afternoon with that glass, it’s a winner.

The last couple of days, Wednesday the 30th and Thursday the 31st of July, go a bit messy. The wind turns cross-on and cross, and the swell is short-period windswell again. Not worth it.

So, to sum it up: if you’ve got the skills, Monday the 28th of July is the big one – big, powerful groundswell, clean, but only for experts. For the everyday surfer, the glassy little window on Tuesday the 29th of July afternoon is your best bet for a fun, clean session.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 26°C on Thu morning, min 24°C on Thu night). Mainly fresh winds.

Days 4-6 Weather Summary

Light rain (total 2mm), mostly falling on Tue morning. Warm (max 26°C on Mon morning, min 24°C on Sun morning). Mainly fresh winds.

Thursday
16
Friday
17
Saturday
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
0
0
1
0
0
0
2
1
2
1
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)
0.6
SSW
16
0.6
SSW
13
0.7
SW
14
1.3
ENE
7
0.6
SSW
16
0.6
SSW
14
1.6
ENE
7
1.6
ENE
7
1.7
ENE
8
1.6
ENE
7
1.4
ENE
8
1.3
ENE
8
0.8
S
16
0.8
S
16
0.8
S
15
0.9
S
14
0.9
S
14
0.9
S
13
1.1
E
13
0.6
SSW
23
0.6
SSW
22
Wave Graph
Metric surfscale
Energy kJ
175
113
211
134
196
145
206
245
353
284
243
201
329
321
267
329
307
277
417
426
363
Wind (km/h)
30
ENE
25
ENE
30
ENE
25
ENE
30
ENE
30
ENE
35
ENE
40
ENE
30
NE
30
ENE
30
ENE
25
ENE
25
ENE
25
ENE
20
ENE
25
ENE
25
ENE
20
ENE
30
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-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
5:59PM0.69m
6:41AM0.30m
6:36PM0.61m
7:44AM0.34m
7:11PM0.52m
8:53AM0.38m
7:45PM0.43m
10:04AM0.43m
8:19PM0.34m
11:13AM0.49m
8:56PM0.27m
12:12PM0.54m
10:06PM0.22m
Low Tide
10:49AM0.01m
1:08AM0.01m
11:44AM0.08m
1:42AM0.01m
12:46PM0.16m
2:15AM0.02m
2:03PM0.22m
2:48AM0.03m
3:52PM0.27m
3:23AM0.04m
6:20PM0.26m
4:02AM0.05m
8:25PM0.21m
part cloud
part cloud
part cloud
part cloud
clear
part cloud
part cloud
clear
part cloud
clear
clear
clear
clear
clear
clear
rain showers
clear
part cloud
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:58
5:58
5:58
5:58
6:00
6:00
6:00
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:15
7:15
7:15
7:15
7:15
7:14
7:14
 mm
2
Temp °C
26
26
25
25
26
25
25
26
24
25
25
25
26
26
25
25
26
25
25
26
25
Feels °C
25
25
25
24
24
24
23
23
21
22
23
24
24
23
24
24
24
24
24
24
24
  • 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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