Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 7 pm 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 17 Jul 2026:

  • Most powerful swell: Thursday 23 Jul, 11PM (local time) - 3ft (0.9m), 19s period, SSW swell with 560 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 0.9m 19s and forecast to arrive on Thursday (Jul 23) 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 Saturday (Jul 18) at 2AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11PM (Thu 23rd Jul)3ft (0.9m) 19s

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


The Lowdown

Alright, folks, Rusty here. Let’s break down Number Fours for the next couple of weeks.

First week is a bit of a grind. The wind is blowing hard from the ENE, cross-off, and the swell is a mess of short-period wind and long-period stuff that just doesn’t line up. Water temp is about average for the time of year. From Friday the 17th through Sunday the 20th, it’s a total write-off – scores are zero, and the energy is weak to moderate (329 to 551). Not worth getting wet.

Monday the 21st and Tuesday the 22nd are a little better, but still marginal. Swell is tiny, around 3 ft to 3 ft, with a long period from the S (14 to 16 seconds), but the wind is still cross-off at 15 to 19 mph. Energy is moderate (506 to 571), but the waves are just not there.

Mid-week, Wednesday the 23rd and Thursday the 24th see bigger energy numbers – 752 to 1160 – but the swell height is still small to moderate (2 ft to 5 ft). The real standout is the long-period groundswell from the SSW on Wednesday (24 seconds!), but it’s breaking straight at this reef, so it won’t be the classic shape. Thursday the 24th brings a more consistent 5 ft from the ENE with a 12-second period – that’s the best of the first week, but still marginal.

Second week picks up strong. From Friday the 25th through to Wednesday the 31st, we get a solid run of bigger, more powerful swells. The combined energy climbs into the four-digit range (741 to 2444). The swell height builds from 2 ft to 8 ft, with the biggest and best being on Tuesday the 29th afternoon and Wednesday the 30th morning. On Tuesday the 29th afternoon, we’ve got 8 ft from the ENE with a 14-second period – that’s expert territory, and the energy is a massive 2444. Wednesday the 30th morning is 7 ft from the ENE at 13 seconds, still strong. The wind stays cross-off from the ENE, which is clean but not glassy. For genuine experts, that window from Tuesday the 29th afternoon to Thursday the 31st morning is the true standout. The sets will be long and powerful, but it’s a reef, so you’ll need to know your line.

After that, it drops off hard. Friday the 1st and Saturday the 2nd of August are back to poor conditions with tiny wind swell.

Overall, the best bet is the late July window – from the 29th to the 31st – for the big, clean, powerful groundswell. It’s not for beginners, but if you’ve got the skills, that’s the time to go. Crowds are possible, but with that size, it’ll thin out the pack.

Rusty.

Short Range Forecast

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

Days 5-7 Weather Summary

Mostly dry. Warm (max 26°C on Mon afternoon, min 24°C on Sun night). Mainly fresh winds.

Friday
17
Saturday
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
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
1
0
0
1
0
0
1
1
1
2
2
1
2
1
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)
0.7
SW
14
0.5
SW
16
0.6
SSW
16
1.6
ENE
7
2
E
7
1.8
ENE
7
1.7
ENE
8
1.6
E
7
1.4
ENE
8
1.4
ENE
8
1.3
ENE
8
0.8
S
16
0.9
S
15
0.9
S
14
0.9
S
14
0.9
S
13
0.5
SSW
24
0.6
SSW
23
1.4
ENE
12
Wave Graph
Metric surfscale
Energy kJ
211
149
196
214
400
337
353
247
232
232
191
321
339
329
298
273
317
426
531
Wind (km/h)
30
ENE
30
ENE
35
ENE
25
ENE
40
ENE
35
ENE
25
NE
30
ENE
30
NE
25
ENE
25
ENE
25
NE
15
NE
25
ENE
30
ENE
20
ENE
30
ENE
35
ENE
25
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
High Tide
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
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
clear
part cloud
clear
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
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
Temp °C
25
26
26
25
26
25
25
25
26
25
25
26
25
26
26
25
26
26
25
Feels °C
24
25
24
24
22
21
23
22
24
23
24
24
24
25
24
24
24
24
23
  • 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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