Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 1 pm 15 Sep 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
27.3°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 16 Sep 2026:

  • Most powerful swell: Tuesday 22 Sep, 8PM (local time) - 8ft (2.4m), 9s period, E swell with 961 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 2.4m 9s and forecast to arrive on Tuesday (Sep 22) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Wednesday (Sep 16) at 5PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8PM (Tue 22nd Sep)8ft (2.4m) 9s

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


The Lowdown

Alright, let’s get real about Number Fours.

The next couple of weeks are a bit of a mixed bag, honestly. There’s surf on the way, but you’re gonna have to wade through some rough, short-period wind swell and a whole lot of cross-off breeze before we see any kind of gold. The first run of proper waves doesn’t show up for a bit, so don’t get too excited about the immediate forecast.

Looking at the start, through the 16th and 17th, we’re looking at small, weak conditions. Swell heights hovering around 2ft to 3ft with a long period SW groundswell, but the energy is weak and the tide is questionable. The wind is a moderate cross-off from the ENE. It’s clean, but there’s just nothing to ride. The swell energy is in the 400s to 600s, which is pretty gutless. Not worth the paddle.

Then Thursday the 17th rolls in, and we see a bump in size, but it’s a complete trade-off. We’re looking at 7ft of wind swell from the ENE with a period of only 7 seconds. That’s short-period junk. It’s got some push to it, but it’s going to be a messy, crumbly mess. The energy jumps up to 880 and then 1172, so there’s power, but it’s not the good kind. This is more of a wind-blown, walled-up closeout. The wind is a fresh cross-off, which keeps the surface clean, but the wave quality is just poor. This continues right through the 21st, with the swell staying between 6ft and 8ft, but the period staying short. The whole joint is going to be a washing machine. I’d sit this stretch out, it's just not fun.

Now, here’s where things start to get interesting. Around the 22nd and into the 23rd, the energy builds back up into the four-digit range, but it’s the wind that finally lets up. On the afternoon of Wednesday the 23rd, we’ve got a 8ft swell from the E, a period of 9 seconds, and a gentle breeze from the NE. The energy reading is a solid 1171. This is the standout of the whole window. The conditions are finally coming together. It’s still got some size to it, but it’s not the messy wind swell we had. This is the one day where you want to be out there. The wave comment is “excellent surf conditions for experienced surfers,” and I’d have to agree. That’s your pick. For the more advanced crew, this is the time to go.

After that, the outlook gets a bit uncertain. The 24th brings in some storm risk with a southerly wind and an onshore component, which is a bit of a shame after the 23rd. Swell drops off, the period stays short, and the surface gets a bit chopped. It’s not the same.

Heading into the final few days of September, from the 25th on, it’s a step back down. The swell mixes back to short-period ENE wind swell, hovering around 7ft, but the quality is back to marginal. The wind is back up to a fresh cross-off. Then by the 27th, the swell fades back down to under 3ft with a long-period SSW groundswell, but the energy is dropping fast. By the last few days, the 28th through the 30th, we’re back to small, weak, and poor. The energy drops into the 300s and 400s. Not worth the effort.

So, to sum it up: the early part is small and weak, there’s a messy stretch of junky wind swell in the middle, but the one real standout is that Wednesday afternoon, the 23rd. That is your day. Get on it if you can. The long-range stuff after that is just too weak and disorganized to get excited about. Keep it on your radar, but don’t hold your breath.

The water temp is right around 81°, which is pretty normal for this time of year, not much of a surprise there.

This is Rusty, signing off. Keep your eye on that Wednesday.

Short Range Forecast

Light rain (total 5mm), mostly falling on Thu night. Warm (max 28°C on Tue afternoon, min 26°C on Tue night). Mainly fresh winds.

Days 5-7 Weather Summary

Mostly dry. Warm (max 27°C on Fri afternoon, min 25°C on Sat night). Mainly strong winds.

Tue
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
Monday
21
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
2
1
1
1
1
2
2
2
1
2
1
0
1
0
0
0
0
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)
0.7
SW
19
0.8
SSW
19
0.9
SW
18
0.9
SSW
18
0.9
SW
17
2.1
ENE
7
2
ENE
9
1
SSW
18
1
SSW
17
1
SSW
17
1
SSW
16
0.9
SSW
16
0.9
SSW
16
1.9
ENE
8
2.3
E
7
1.9
ENE
8
2.2
E
8
1.9
ENE
8
2
ENE
8
2.2
ENE
8
Wave Graph
Metric surfscale
Energy kJ
384
470
455
541
429
455
630
644
622
580
539
382
387
461
585
385
566
452
486
614
Wind (km/h)
20
ENE
20
ENE
25
ENE
30
NE
30
NE
30
ENE
35
ENE
30
ENE
35
ENE
35
ENE
30
ENE
35
ENE
40
ENE
35
ENE
40
ENE
35
ENE
35
ENE
40
ENE
35
ENE
35
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
High Tide
6:07PM0.30m
7:59AM0.57m
6:32PM0.25m
9:10AM0.56m
7:25PM0.21m
10:27AM0.57m
11:01PM0.21m
11:34AM0.59m
00:19AM0.23m
12:26PM0.61m
00:59AM0.27m
1:06PM0.62m
1:32AM0.32m
Low Tide
2:03PM0.23m
00:07AM0.11m
4:06PM0.24m
00:38AM0.13m
7:14PM0.21m
1:26AM0.16m
7:23PM0.18m
2:56AM0.18m
7:43PM0.16m
4:35AM0.17m
8:01PM0.15m
5:47AM0.16m
8:17PM0.13m
clear
clear
clear
clear
part cloud
part cloud
thunderstorm
thunderstorm
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:18
6:18
6:18
6:18
6:18
6:18
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:34
6:32
6:31
6:30
6:30
6:29
6:28
 mm
1
4
Temp °C
28
27
27
27
26
27
27
26
27
27
26
27
27
26
26
26
26
26
27
26
Feels °C
30
28
27
26
25
26
26
26
24
24
24
25
24
24
23
22
23
23
24
25
  • 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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