Number Fours Surf Break

Lat Long: 21.28° N 157.83° W

Number Fours Surf Forecast and Surf Report

Issued: 7 am 18 Aug 2026 (local time)

Forecast update in  hr  min

Today's Number Fours sea temperature is
27.0° 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 18 Aug 2026:

  • Best quality surf: Thursday 20 Aug, 2AM (local time) - 1.5ft (0.5m), 16s period, SW swell with cross-offshore winds.
  • Most powerful swell: Tuesday 25 Aug, 2AM (local time) - 8ft (2.4m), 8s period, ENE swell with 678 kJ wave energy.
  • Next surfable swell (1★+): Thursday 20 Aug, 2AM (local time) - 1.5ft (0.5m), 16s period with SW 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 20) at 2AM. The primary swell is predicted to be 0.5m and 16s period with a secondary swell of 0.9m and 8s. 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 2.4m 8s and forecast to arrive on Tuesday (Aug 25) 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 1.0m 7s period and expected on Thursday (Aug 20) at 11PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 2AM (Thu 20th Aug)1.5ft (0.5m) 16s
Best Surf 2AM (Thu 20th Aug)1.5ft (0.5m) 16s
Most Powerful 2AM (Tue 25th Aug)8ft (2.4m) 8s

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


The Lowdown

Alright, let’s take a look at Number Fours, a reef break that’s exposed to the swell and has a best direction from the SSE. Right now, the water’s sitting at a warm 81°, which is about average for this time of year, so no surprises there.

The next 16 days are a bit of a mixed bag, and honestly, the first week is pretty grim. We’ve got small, weak swells mixed with strong, gusty cross-offshore winds that are going to make it tough to find anything worth paddling out for. The early part of the window is a write-off for any decent surf.

There’s a real lull through the middle of the week, with nothing surfable until things start to shift around the end of the month. The standout window is shaping up for the final weekend of August and into the start of September.

Let’s talk about the best on offer. Saturday, the 29th of August, afternoon looks like the brightest spot. We’re seeing a clean 8 ft swell from the ENE, with a period of 8 seconds, and the wind drops to a gentle 9 mph breeze. The combined wave energy is strong at 962. This is a proper, powerful swell that’s going to be pushing through, but at this size, it’s for experienced surfers only. The wind is light and cross-offshore, which should keep the faces clean and lined up. Even though the period is a bit on the short side, the sheer size and energy will make for some solid, punchy reef waves. Expect crowds to be possible here, as it’s a known spot.

After that, Sunday the 30th of August afternoon sees the swell jump to 10 ft from the ENE, with a combined energy of 1886, making it a very strong, powerful swell. The wind remains moderate, but this is big, serious, expert-only territory. The period is still short, so it’ll be a bit walled up and take some real nerve to handle.

Looking further ahead into the first few days of September, the swell drops back a bit, but the energy stays high, and the period stretches out to 10 seconds, which should improve the shape. The wind stays cross-offshore, but it’s a longer-range call, so treat it as promising but not locked in.

Overall, if you’re an experienced surfer, the weekend of the 29th and 30th of August is where you want to focus. The rest of the time is either too small, too windy, or too messy for a proper session.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 27°C on Thu afternoon, min 24°C on Tue night). Winds decreasing (fresh winds from the ENE on Tue afternoon, calm by Thu night).

Days 4-6 Weather Summary

Mostly dry. Warm (max 27°C on Fri afternoon, min 25°C on Fri morning). Winds increasing (calm on Fri afternoon, strong winds from the ENE by Sun morning).

Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
AM
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
1
1
1
2
1
2
2
1
1
1
0
0
1
0
0
1
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)
1.3
ENE
7
1
E
8
1.2
ENE
8
0.5
SW
16
0.8
E
8
0.5
SW
16
0.6
SSW
18
0.6
SSW
17
0.7
SW
16
0.7
SW
17
0.7
SW
16
0.8
SSW
16
0.7
SW
16
0.7
SW
16
2.1
E
7
2.3
E
7
2.1
E
7
2
ENE
7
2.2
ENE
7
2.1
ENE
7
2.4
ENE
8
Wave Graph
Metric surfscale
Energy kJ
165
120
155
129
100
129
207
200
274
291
261
322
261
255
428
569
439
350
435
456
678
Wind (km/h)
25
ENE
25
NE
20
NE
20
ENE
25
ENE
15
NE
15
ENE
10
NE
5
E
10
SE
5
E
15
ENE
35
ENE
40
ENE
30
ENE
40
ENE
40
ENE
35
NE
40
ENE
35
ENE
35
ENE
Wind State
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
glassy
cross-on
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
8:59AM0.51m
7:16PM0.30m
10:13AM0.53m
11:25AM0.56m
10:11PM0.21m
12:25PM0.59m
00:08AM0.21m
1:12PM0.63m
1:06AM0.23m
1:52PM0.66m
1:46AM0.26m
2:26PM0.67m
2:21AM0.29m
Low Tide
3:56PM0.27m
2:01AM0.10m
2:47AM0.12m
8:27PM0.20m
8:41PM0.17m
5:06AM0.12m
9:00PM0.16m
6:08AM0.10m
9:18PM0.14m
6:59AM0.08m
9:35PM0.13m
clear
clear
clear
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:09
6:11
6:11
6:11
6:11
6:11
6:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:59
6:58
6:57
6:57
6:55
6:54
6:53
 mm
Temp °C
25
26
25
25
26
25
26
27
26
26
27
26
26
26
26
26
26
25
26
26
25
Feels °C
23
23
24
25
25
26
27
29
29
29
30
28
26
23
24
23
23
22
23
23
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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