Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 1 pm 18 Jul 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
26.6° 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 19 Jul 2026:

  • Most powerful swell: Saturday 25 Jul, 8PM (local time) - 3.5ft (1.0m), 18s period, SSW swell with 662 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 1.0m 18s and forecast to arrive on Saturday (Jul 25) 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 0.4m 13s period and expected on Saturday (Jul 18) at 8PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8PM (Sat 25th Jul)3.5ft (1.0m) 18s

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


The Lowdown

Alright folks, Rusty here. Let’s have a look at what Number Fours (reef) has in store for us. Honestly, the next couple of weeks are a bit of a mixed bag, and we’re going to have to wait through some grotty conditions before anything really gets going.

The water is sitting at a warm 80°, which is about average for the time of year, so no need to dig out the thick rubber just yet.

The immediate outlook is pretty grim. We’ve got a solid ENE wind blowing, and the swell is from the same direction, which is going to make a mess of things. The wave energy is moderate (551) on Saturday the 18th, with a lumpy 6ft, 8-second windswell, but it’s just poor surf. We’ve got a few days of marginal, cross-off wind and weakish swell that’s not really worth paddling out for.

The real glimmer comes on Monday the 20th. The afternoon sees a switch to a proper S groundswell. At 3ft and a long 16-second period, it’s not huge, but that long period suggests proper lines and shape. The energy is moderate (630). The wind is still cross-off, but it’s clean. The water is still warm. It’s just a marginal outlook, but it’s the best we’ve had so far. This reminds me, this long period swell is going to wrap in nicely here at this reef, focusing the energy better than a beach break would.

After that, we drift into a long dry spell. The wind just won’t let up, and the swell is small and mixed up. There’s a lot of cross-off breeze and small, short-period junk. The energy values are all over the place, but the quality is just not there.

We get a bit of a pulse around the 24th and 25th of July. The swell jumps back to 6ft to 7ft from the ENE, but it’s short period (7-8 seconds) and the wind is still cranking. That’s a messy, choppy combo that’s more for the kite crew than a proper paddle session. The combined energy is actually strong on the 24th afternoon (1169) and 25th morning (1180), but the poor wind and short period kill the vibe.

Finally, there’s a promising but less certain window towards the end of the month. On the 26th of July, we see a mix of E swell with a 16-second period, and the wind drops to a moderate breeze from the NE. The swell is 3ft to 4ft, and the energy is strong (1503). This is the standout of the entire outlook. It’s a proper groundswell with a very long period, and the wind is just about manageable. This is where the reef will shine. The 27th keeps that going with a similar 5ft, 14-15 second swell and moderate ENE wind. The score is finally a 3, which is the best we get. The 28th mirrors that, with 5ft, 13-second swell and moderate wind. Week two is looking more promising than the first, but it’s still a long way out.

The vibe is a bit flat for the first week, but once we hit that last week of July, the groundswell is the real deal. It’s a quiet start, but the reef will wake up.

Rusty

Short Range Forecast

Mostly dry. Warm (max 26°C on Sat afternoon, min 24°C on Sat night). Mainly strong winds.

Days 5-7 Weather Summary

Mostly dry. Warm (max 26°C on Tue afternoon, min 24°C on Wed morning). Mainly strong winds.

Sat
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
Thursday
23
Friday
24
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
1
0
0
0
1
1
2
1
1
1
0
1
1
0
0
1
0
2
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.9
ENE
8
1.9
ENE
8
1.6
ENE
8
1.4
ENE
8
1.4
ENE
6
1.4
ENE
8
0.8
S
16
0.9
S
15
0.9
S
14
0.9
S
14
0.9
S
13
1.2
ENE
7
0.6
SSW
23
1.9
ENE
7
0.7
SSW
20
0.7
SSW
20
2.4
ENE
7
1.9
ENE
7
2.2
ENE
7
2.1
ENE
8
Wave Graph
Metric surfscale
Energy kJ
385
416
302
250
160
226
321
339
329
307
277
138
426
363
412
395
563
376
512
481
Wind (km/h)
40
ENE
30
ENE
30
ENE
30
ENE
25
ENE
30
ENE
30
ENE
20
NE
25
ENE
35
ENE
30
ENE
30
ENE
30
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
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
1:02PM0.59m
11:46PM0.19m
1:44PM0.62m
00:59AM0.18m
Low Tide
2:15AM0.02m
2:03PM0.22m
2:48AM0.03m
3:52PM0.27m
3:23AM0.04m
6:20PM0.26m
4:02AM0.05m
8:25PM0.21m
9:13PM0.17m
5:34AM0.05m
9:41PM0.14m
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:58
6:00
6:00
6:00
6:01
6:01
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:15
7:15
7:15
7:14
7:14
7:14
7:13
 mm
Temp °C
26
25
25
26
25
25
26
25
26
26
25
25
25
25
25
25
25
25
25
25
Feels °C
22
23
22
23
23
24
24
24
25
24
23
22
22
22
22
21
22
22
21
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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