Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 7 pm 31 Jul 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
27.0° C
0.6° 

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 1 Aug 2026:

  • Best quality surf: Tuesday 4 Aug, 2PM (local time) - 5ft (1.5m), 11s period, ENE swell with cross-offshore winds.
  • Most powerful swell: Saturday 1 Aug, 11AM (local time) - 10ft (3.0m), 8s period, E swell with 1,314 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 4 Aug, 2PM (local time) - 5ft (1.5m), 11s 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 Tuesday (Aug 04) at 2PM. The primary swell is predicted to be 1.5m and 11s period with a secondary swell of 0.4m and 12s. 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 11AM. Winds are predicted to be cross-offshore at the time the swell arrives.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 2PM (Tue 4th Aug)5ft (1.5m) 11s
Best Surf 2PM (Tue 4th Aug)5ft (1.5m) 11s
Most Powerful11AM (Sat 1st Aug)10ft (3.0m) 8s

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


The Lowdown

Alright, grab a coffee and listen up – Rusty here, giving you the full rundown on Number Fours. This reef out here, getting a SSE exposure, is a tricky beast. It's fairly consistent, but the wind is our enemy for most of this run. The water temp is about what you'd expect for this time of year, so nothing wild there.

We're starting off with a bit of a mess. The first few days from Saturday the 1st to Monday the 3rd of August, we've got a solid 7 ft to 10 ft of short-period swell from the E and ENE, but the wind is howling in from the ENE at 22 to 28 mph. It's a cross-off, so the waves will be clean, but the wind state is a strong to fresh breeze, making it a battle. The energy is strong, hitting 1483 on Saturday morning, but the quality is marginal. Honestly, it's a lot of water moving around, but it's not going to be pretty. This is more for the kitesurfers out there, to be honest.

Things settle down a touch from Tuesday the 4th through to Wednesday the 5th. The swell drops to 4 ft to 5 ft, and the period stretches out a bit to 10-11 seconds, which is an improvement. The wind backs off too, with gentle to light breezes. The energy drops to moderate, around 309-570. Still, the wind is a cross-off, and the conditions are clean. Not a standout, but a step in the right direction.

Then we hit a flat spell. Thursday the 6th sees a tiny 1 ft of SSW swell with a very long 14-second period, but the wind goes glassy from the NNW. It's a beautiful moment, but the swell is too small to do anything with. From Friday the 7th to Wednesday the 13th, the wind is a constant fresh breeze from the ENE, and the surf quality is poor. There's a mix of tiny SSW swells and short-period ENE windswell, but it's all junk. The energy is weak to moderate, and the scores are bottom of the barrel. It's a long, frustrating gap.

The best of the bunch, and really the only thing to get excited about, is the morning of Wednesday the 6th of August. We've got that glassy, NNW wind, and even though the swell is tiny at 1 ft from the SSW with a very long 14-second period, it's the cleanest window we'll see. That long period is a groundswell, best for the reef here, but it'll be small and inconsistent. It's a rare moment of calm, but it's a gamble.

The very end of the run, from Wednesday the 12th to Sunday the 16th, shows a bit more promise on the charts. We start seeing 2 ft to 3 ft of swell from the S and SSW, with periods of 14 to 19 seconds – that's proper groundswell energy. The wave energy is moderate, hitting 733 on the 12th afternoon. The problem is that relentless ENE wind, 19 to 22 mph, pulsing through. It's a cross-off, so the waves will be clean, but the wind will be strong. It's a long-range call, so take it with a grain of salt, but if that wind ever drops, Number Fours could have a few fun ones.

So, for the true standout, it's a toss-up between the glassy calm on the 6th and the promise of those long-period S swells in the second week. The glassy morning is a sure thing for a clean, if tiny, session. The bigger swells later are a potential, but you'll be fighting the wind.

Rusty, signing off.

Short Range Forecast

Mostly dry. Warm (max 26°C on Sat morning, min 25°C on Fri night). Winds decreasing (strong winds from the ENE on Fri night, moderate winds from the NE by Sun night).

Days 5-7 Weather Summary

Light rain (total 3mm), mostly falling on Wed afternoon. Warm (max 27°C on Tue afternoon, min 25°C on Mon night). Wind will be generally light.

Saturday
1
Sunday
2
Monday
3
Tuesday
4
Wednesday
5
Thursday
6
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
1
1
0
1
1
1
1
2
2
1
2
2
2
1
1
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
3
E
8
3
E
8
2.5
ENE
8
3
ENE
8
2.3
ENE
8
2.2
ENE
8
2.2
ENE
8
1.7
ENE
8
1.5
ENE
8
1.4
ENE
8
1.5
ENE
11
1.5
ENE
11
1.3
ENE
11
1.2
ENE
10
1.1
ENE
9
0.9
ENE
8
0.4
SSW
14
1
ENE
8
0.5
SW
14
Wave Graph
Metric surfscale
Energy kJ
1178
1314
893
1026
758
642
612
394
313
277
515
476
372
253
184
113
82
127
102
Wind (km/h)
45
ENE
45
ENE
40
ENE
40
ENE
35
ENE
35
ENE
30
ENE
25
ENE
30
NE
20
ENE
15
ENE
15
NE
15
ENE
10
E
5
NE
10
ENE
5
NNW
25
ENE
20
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
glassy
cross-off
cross-off
High Tide
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
11:24AM0.60m
9:30PM0.22m
Low Tide
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
7:39PM0.21m
4:08AM0.02m
part cloud
clear
clear
clear
clear
clear
part cloud
part cloud
clear
part cloud
part cloud
part cloud
part cloud
part cloud
thunderstorm
part cloud
thunderstorm
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:03
6:05
6:05
6:05
6:05
6:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:09
7:09
7:08
7:08
7:07
7:07
7:07
 mm
2
1
Temp °C
25
26
26
25
26
26
25
26
26
25
26
27
26
27
27
26
26
26
26
Feels °C
21
21
22
22
23
23
22
24
24
24
27
28
28
30
30
28
30
27
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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