Number Fours surfForecast / HAW – Oahu / USA

information circle16 Day Weather and Surf, issued 1 am Thursday 21 May 2026 HST
Forecast update in hr  min  s Forecast update imminent
Number Fours surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Number Fours sea temperature is
25.8° C
(Which is slightly warmer than usual)

Best Forecast Surf Conditions for Number Fours this week:

The most powerful waves expected at Number Fours in the next 16 days are 3.0m 8s and forecast to arrive on Thursday (May 21) at 5PM. 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 15s period and expected on Saturday (May 23) at 8PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 5PM (Thu 21st May)10ft (3.0m) 8s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Mostly dry. Warm (max 24°C on Thu morning, min 23°C on Thu morning). Mainly strong winds.

Days 4-6 Weather Summary

Mostly dry. Warm (max 24°C on Sun morning, min 23°C on Sun morning). Mainly strong winds.

Thursday
21
Friday
22
Saturday
23
Sunday
24
Monday
25
Tuesday
26
Wednesday
27
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
0
1
1
1
1
1
1
1
0
0
0
0
0
0
1
0
0
0
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)
3
ENE
8
3
ENE
8
3
ENE
8
2.5
ENE
8
2.5
ENE
8
2.5
ENE
8
2.5
ENE
8
2.5
ENE
8
2.5
ENE
8
2.2
ENE
8
2.3
ENE
8
2.1
ENE
8
2.1
ENE
8
2
ENE
8
2.1
ENE
7
2.1
ENE
7
2
ENE
7
1.9
ENE
7
2.1
ENE
7
1.7
ENE
7
1.8
ENE
7
Wave Graph
Metric surfscale
Energy kJ
1108
1252
1123
909
897
824
897
931
817
675
696
569
545
459
475
462
395
397
462
310
310
Wind (km/h)
45
ENE
45
ENE
40
ENE
40
ENE
40
ENE
35
ENE
45
ENE
40
ENE
35
ENE
40
ENE
40
ENE
40
ENE
40
ENE
40
ENE
35
ENE
35
ENE
40
ENE
35
ENE
40
ENE
35
ENE
35
ENE
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
cross-off
High Tide
8:55AM0.12m
8:43PM0.58m
10:30AM0.18m
9:37PM0.51m
11:42AM0.26m
10:30PM0.44m
12:35PM0.34m
11:20PM0.37m
1:17PM0.42m
00:06AM0.30m
1:54PM0.49m
00:50AM0.25m
2:27PM0.55m
1:31AM0.21m
Low Tide
12:55PM0.05m
4:33AM-0.04m
2:25PM0.11m
5:12AM-0.05m
4:11PM0.16m
5:45AM-0.05m
5:51PM0.17m
6:13AM-0.06m
7:16PM0.16m
6:39AM-0.06m
8:25PM0.13m
7:03AM-0.06m
9:23PM0.11m
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
part cloud
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:50
5:50
5:50
5:50
5:50
5:48
5:48
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:04
7:05
7:05
7:06
7:06
7:07
7:07
Temp °C
24
24
23
23
24
23
23
24
23
24
24
23
24
24
23
24
24
23
24
24
24
18
19
17
18
18
18
18
18
18
20
19
18
19
19
19
20
20
19
20
19
21
Swell 1
Height (m)
Direction
Period (s)
0.5
S
16
0.5
S
16
0.5
S
15
0.5
S
14
0.4
SSW
14
0.5
S
16
0.5
S
16
0.6
S
15
0.6
S
15
0.5
S
14
0.5
S
14
0.6
S
14
0.5
S
14
0.5
S
13
0.5
S
13
0.4
S
13
0.4
S
12
0.6
S
15
0.6
S
14
0.5
S
13
0.5
S
13
Energy kJ
132
127
110
107
62
130
125
159
155
93
93
142
97
85
84
51
47
150
142
88
83
Swell 2
Height (m)
Direction
Period (s)
0.3
SSW
13
0.2
SSE
13
0.3
SSE
13
0.3
S
18
0.4
S
18
0.4
SSW
13
0.2
NNW
10
0.3
NNW
15
0.4
NW
14
0.4
NW
12
0.4
NW
12
0.3
NW
11
0.2
NNW
11
0.2
NNW
11
0.1
NW
10
0.3
S
16
0.3
S
16
0.4
NW
16
0.4
NW
14
0.4
NW
14
0.4
NW
13
Energy kJ
33
17
32
57
98
60
10
44
46
39
37
20
12
11
4
45
45
89
73
66
59
Swell 3
Height (m)
Direction
Period (s)
0.2
SSE
13
0.2
SSW
12
0.2
S
12
0.3
SSE
12
0.2
SSE
12
0.2
SSE
12
0.2
SSE
12
0.2
SSE
12
0.2
SSE
11
0.3
S
16
0.3
S
16
0.1
SW
20
0.2
SSE
8
0.1
S
20
0.1
SW
19
0.1
NW
10
0.3
NW
18
0.1
SW
18
0.2
SSE
8
0.2
SSE
8
0.2
SSW
16
Energy kJ
17
14
11
29
14
14
14
14
12
46
46
16
7
7
15
4
50
12
7
7
25
Wind waves
Height (m)
Direction
Period (s)
3
ENE
8
3
ENE
8
3
ENE
8
2.5
ENE
8
2.5
ENE
8
2.5
ENE
8
2.5
ENE
8
2.5
ENE
8
2.5
ENE
8
2.2
ENE
8
2.3
ENE
8
2.1
ENE
8
2.1
ENE
8
2
ENE
8
2.1
ENE
7
2.1
ENE
7
2
ENE
7
1.9
ENE
7
2.1
ENE
7
1.7
ENE
7
1.8
ENE
7
Energy kJ
1108
1252
1123
909
897
824
897
931
817
675
696
569
545
459
475
462
395
397
462
310
310
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
3
3
2
3
1
2
1
1
1
1
1
1
2
1
2
3
2
2
Distance (km)
147
128
126
201
201
48
210
127
34
127
126
39
155
155
44
48
126
39
39
48
39
Best forecast wave conditions in Oahu
Rating
(10 max)
2
3
2
2
2
3
3
2
2
Best forecast wave conditions in United States
Rating
(10 max)
3
2
3
3
3
2
3
1
3
1
1
3
4
2
3
2
1
4
3
2
4
Header Global
Rating
(10 max)
5
5
7
6
8
6
8
6
5
5
5
4
5
5
4
4
5
6
5
5
5
  • Map Icons:
  • Break
  • 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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