Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 1 pm 05 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 6 Aug 2026:

  • Best quality surf: Thursday 6 Aug, 8AM (local time) - 1.5ft (0.4m), 15s period, SSW swell with cross-offshore winds.
  • Most powerful swell: Wednesday 12 Aug, 11AM (local time) - 3.5ft (1.0m), 18s period, S swell with 627 kJ wave energy.
  • Next surfable swell (1★+): Thursday 6 Aug, 8AM (local time) - 1.5ft (0.4m), 15s period with SSW 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 Thursday (Aug 06) at 8AM. The primary swell is predicted to be 0.4m and 15s period with a secondary swell of 0.8m and 5s. Another secondary swell of 0.7m and 8s is also forecast. 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 1.0m 18s and forecast to arrive on Wednesday (Aug 12) at 11AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Saturday (Aug 08) at 2AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Thu 6th Aug)1.5ft (0.4m) 15s
Best Surf 8AM (Thu 6th Aug)1.5ft (0.4m) 15s
Most Powerful11AM (Wed 12th Aug)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 has in store for us over the next couple of weeks.

Right off the bat, the surf is pretty marginal. The first day we see anything worth paddling out for is Wednesday afternoon, August 5th. We’ve got a 4ft swell rolling in from the ENE with a 9-second period, and the combined energy is sitting at 379 (moderate). The wind is a cross-off at 12 mph, which keeps things clean, but the wave comment says it’s marginal. The water’s a warm 81°, which is about average for this time of year.

Then we hit a dry spell. From Thursday morning, August 6th, right through to Monday morning, August 10th, the scores are all zeroes. Swell drops right off to 1ft, and even though a few longer-period swells (14 to 20 seconds) show up, the energy is low and the conditions are just poor. The wind stays a fresh cross-off, but it’s not enough to save it.

We start to see a little pulse again on Monday afternoon, August 10th, with a 2ft swell from the SSW at a very long 16 seconds, and the energy jumps to 454 (moderate). It’s still marked as poor. Tuesday, August 11th, gets a bit better – the afternoon shows a 3ft SSW swell, 14 seconds, and an energy reading of 511 (moderate). The score ticks up to a 2, but it’s still just a marginal call.

The real interesting window opens up around Wednesday, August 12th. We’ve got a 3ft swell from the S, with a long 18-second period, and the energy is pumping at 975 (approaching strong). The wind is a fresh cross-off from the ENE at 19-22 mph. It’s still considered marginal, but this is the best energy we’ve seen. That long-period S swell is a groundswell, which means it’s got grunt, but it might break a bit straight on a reef setup like Number Fours if the angle isn’t perfect. The clean conditions are a big plus.

After that, it gets messy. From Thursday, August 13th, through to Wednesday, August 20th, the swell builds but the wind strengthens. We see the swell climb from 4ft to a peak of 8ft on August 14th and 15th, coming from the ENE with a short 7-8 second period. The energy hits four digits – 1056 to 1106 (strong) – but the wind is a strong breeze at 25-28 mph, and the surf is consistently rated poor. At 8ft, that’s expert territory, and with the short period and powerful wind, it’s going to be a choppy, blown-out mess. Honestly, for a few days there, it’s looking more like a kite-surfing show than a paddle session.

The Standout: If you’ve got a window, aim for Wednesday afternoon, August 12th. That 3ft S swell with the 18-second period and clean cross-off wind is your best bet for a decent wave. It’s only a 1/10 score but don’t let that fool you – the energy is there, and the conditions are about as clean as we’ll see. The rest of the fortnight is a write-off or for the experts only.

Stay salty,
Rusty.

Short Range Forecast

Mostly dry. Warm (max 26°C on Wed afternoon, min 24°C on Thu night). Winds increasing (light winds from the ENE on Wed night, fresh winds from the ENE by Sat morning).

Days 5-7 Weather Summary

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

Wed
5
Thursday
6
Friday
7
Saturday
8
Sunday
9
Monday
10
Tuesday
11
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
0
0
0
0
0
0
0
1
0
1
0
1
0
0
0
1
2
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.1
ENE
9
0.8
ENE
9
0.4
SSW
14
0.4
SSW
14
0.5
SW
14
0.4
SSW
14
0.4
SW
20
0.4
SSW
19
1.4
ENE
7
1.7
ENE
7
1.7
ENE
7
1.8
ENE
7
1.9
ENE
8
1.8
ENE
7
1.3
ENE
7
0.6
SSW
16
1.3
ENE
7
0.7
SSW
14
0.8
SSW
14
0.7
S
20
Wave Graph
Metric surfscale
Energy kJ
203
86
81
80
102
77
99
148
163
240
281
337
385
337
186
191
184
218
269
373
Wind (km/h)
20
ENE
20
ENE
20
ENE
25
ENE
25
ENE
25
ENE
30
ENE
30
ENE
35
ENE
35
ENE
35
ENE
35
ENE
35
ENE
30
ENE
25
ENE
30
ENE
25
ENE
20
ENE
25
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
cross-off
High Tide
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
3:35PM0.79m
3:43AM0.31m
Low Tide
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
8:15AM-0.02m
10:40PM0.05m
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<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:05
6:05
6:07
6:07
6:07
6:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:07
7:07
7:06
7:06
7:05
7:05
7:04
 mm
Temp °C
26
25
26
26
25
26
26
25
26
26
25
25
26
25
26
26
25
26
27
26
Feels °C
25
25
26
25
24
25
25
24
24
23
24
23
24
24
26
26
24
26
27
26
  • 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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