Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 7 pm 04 Aug 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
27.0° C
0.5° 

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 5 Aug 2026:

  • Most powerful swell: Wednesday 12 Aug, 2AM (local time) - 2.5ft (0.7m), 20s period, S swell with 365 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 20s and forecast to arrive on Wednesday (Aug 12) at 2AM. 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 Friday (Aug 07) at 11PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2AM (Wed 12th Aug)2.5ft (0.7m) 20s

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


The Lowdown

Alright, let’s get into it. The next couple of weeks are a bit of a mixed bag out at Number Fours. We’ve got a lot of clean conditions on the cards, but the swell direction is all over the shop, and the energy is playing games with us. It’s not going to be a total flat spell, but you’ll have to pick your moments.

The first real chance to paddle out looks like it’ll be Wednesday morning, the 5th. It’s not a lot of size, with waves around 3.9ft from the ENE at 10 seconds, and the energy is weak (347). It’ll be clean with a moderate cross-off breeze, but the tide and swell combo is looking questionable, so it’s more of a fun-sized novelty than a proper session. The afternoon is pretty much the same story, just a touch smaller.

Thursday the 6th and Friday the 7th are looking pretty grim. We’ve got a major drop in size, down to 1.3ft, with a long-period SSW/SW swell. The period is up there, 14 to 21 seconds, but there’s just no power behind it. The energy is weak to moderate (151-213), and honestly, it’s going to be a real struggle to get a wave. Not worth your time unless you need to sit in the water.

The weekend rolls in with a bump in size but a bad wind. Saturday the 8th sees the swell push up to 5.6ft from the ENE with a short, crumbly 6-7 second period. The energy goes moderate (519), but it’s a fresh cross-off breeze and the quality is just poor. Same goes for Sunday the 9th and Monday the 10th – it’s around 5.6ft of short-period ENE windswell, and even though it’s clean on the surface, it’s not a good look.

Tuesday the 11th and Wednesday the 12th see a shift back to a longer period S/SW groundswell. The size drops to 2.3-3ft, but the period jumps to a very long 15-18 seconds. The energy builds to strong (843) on Wednesday, but the wave quality just isn't there. This long period stuff at a reef like Number Fours can be decent, but the size is just too small to do anything with.

Thursday the 13th is more of the same, with 3.6ft at 15-16 seconds from the S, but the wind picks up into the fresh to strong breeze territory. It’s clean, but the size and wind combo makes it a poor call.

Alright, now here’s where things get interesting. From Friday the 14th all the way through to Sunday the 17th, the swell really jacks up, but with strong winds, mostly from the ENE at 25-28 mph. We’re looking at 6.6ft to 8.2ft of short-period ENE swell, and it’s going to be a messy, blown-out mess. The energy is strong, hitting 978 on the 17th, but with winds like that, this is looking way more like a kite-surfing day than a paddle-surfing day. It’s going to be big and powerful but not clean.

The real standout, and the only one worth getting excited about, is Monday the 18th and Tuesday the 19th. The swell holds strong at a solid 9.8ft, but the period lengthens out to 9 seconds, and the wind eases off. With energy levels hitting very strong (1478-1537), this is the biggest and most powerful swell of the window. It won't be for the faint-hearted. Anything over 8.2ft is expert territory, so only the best will be out there. The direction is still ENE, which isn't the optimum for this spot (it prefers SSE), so expect some wobbly lines, but the power will be something to see. The cleaner conditions on Tuesday the 19th make it the prime candidate, with a fresh breeze that should keep the faces fairly clean.

Looking into the 20th, the swell drops to 7.5ft with a more favorable NE wind, and the energy is still very strong (1307). It could be a fun, big day, but with that swell direction still not ideal, it’s a promise, not a guarantee, this far out.

So to wrap it up: the next week is mostly a washout. Your best bet is the 18th and 19th for a serious, powerful session, but it's really only for the experts. The surf will be big, but the quality will be the big question mark. Confidence is decent on that long-range call, but we’ve all been burned before.

Later.

Short Range Forecast

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

Days 5-7 Weather Summary

Mostly dry. Warm (max 26°C on Sat morning, min 25°C on Fri night). Mainly fresh winds.

Wednesday
5
Thursday
6
Friday
7
Saturday
8
Sunday
9
Monday
10
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
0
0
0
0
0
0
1
1
0
0
1
1
1
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.3
ENE
10
1.2
ENE
10
1.1
ENE
9
1.3
ENE
9
0.4
SSW
14
0.4
SSW
14
0.5
SW
14
0.4
SW
21
0.4
SW
20
0.4
SSW
19
1.7
ENE
6
1.6
ENE
7
1.5
ENE
7
1.7
ENE
7
1.7
ENE
7
1.7
ENE
7
1.7
ENE
7
1.6
ENE
7
1.5
ENE
7
Wave Graph
Metric surfscale
Energy kJ
358
253
203
238
81
80
102
115
99
148
226
227
212
289
305
302
286
261
215
Wind (km/h)
25
ENE
25
ENE
25
ENE
20
ENE
20
ENE
25
ENE
20
ENE
30
ENE
25
ENE
30
ENE
35
ENE
30
ENE
30
ENE
35
ENE
35
ENE
30
ENE
30
ENE
30
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
10:11AM0.53m
8:07PM0.29m
11:24AM0.60m
9:30PM0.22m
12:27PM0.67m
11:32PM0.19m
1:22PM0.73m
00:59AM0.19m
2:10PM0.78m
2:02AM0.22m
2:54PM0.80m
2:55AM0.26m
Low Tide
2:23AM0.03m
5:19PM0.27m
3:10AM0.03m
7:39PM0.21m
4:08AM0.02m
8:34PM0.16m
5:14AM0.01m
9:09PM0.12m
6:20AM-0.01m
9:40PM0.08m
7:20AM-0.02m
10:10PM0.06m
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clear
part cloud
part cloud
clear
clear
part cloud
part cloud
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part cloud
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<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:05
6:05
6:05
6:07
6:07
6:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:07
7:07
7:07
7:06
7:06
7:05
7:05
 mm
Temp °C
26
26
26
25
25
26
25
25
26
25
26
26
25
25
26
25
26
26
25
Feels °C
27
26
25
25
26
25
25
23
24
24
23
23
23
23
24
23
26
25
24
  • 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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