Number Fours surfForecast / HAW – Oahu / USA

information circle16 Day Weather and Surf, issued 1 am Wednesday 20 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 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 8s period and expected on Monday (May 25) at 8PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8PM (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 Wed morning, min 23°C on Wed night). Mainly strong winds.

Days 4-6 Weather Summary

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

Wednesday
20
Thursday
21
Friday
22
Saturday
23
Sunday
24
Monday
25
Tuesday
26
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
0
0
1
1
0
0
1
1
1
0
0
0
0
0
0
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)
2
ENE
8
2.2
ENE
8
3
ENE
8
3
ENE
8
3
ENE
8
3
ENE
9
2.5
ENE
8
2.4
ENE
8
2.4
ENE
8
2.5
ENE
8
2.5
ENE
8
2.5
ENE
8
2.3
ENE
8
2.2
ENE
8
2.4
ENE
8
2
ENE
8
2.1
ENE
8
1.8
ENE
8
1.7
ENE
8
1.9
ENE
7
2
ENE
7
Wave Graph
Metric surfscale
Energy kJ
484
644
1009
1081
1125
1150
909
763
763
857
903
899
731
659
707
534
558
412
356
382
417
Wind (km/h)
40
ENE
45
ENE
45
ENE
45
ENE
45
ENE
40
ENE
40
ENE
40
ENE
35
ENE
40
ENE
45
ENE
40
ENE
40
ENE
40
ENE
35
ENE
40
ENE
40
ENE
40
ENE
40
ENE
40
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
7:47PM0.64m
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
Low Tide
11:49AM-0.02m
3:46AM-0.03m
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
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
clear
part cloud
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
5:50
5:48
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:04
7:04
7:05
7:05
7:06
7:06
7:07
Temp °C
24
24
23
24
24
23
24
24
23
24
24
23
24
24
23
24
24
23
24
24
23
21
19
18
18
18
17
19
19
18
19
18
18
18
19
18
20
20
18
19
19
19
Swell 1
Height (m)
Direction
Period (s)
0.6
SSW
14
0.5
SSW
14
0.4
SSW
13
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
0.6
S
14
0.5
S
13
0.5
S
13
0.5
S
13
0.6
S
16
0.6
S
14
Energy kJ
163
108
68
132
127
110
107
62
130
125
159
155
93
93
140
140
88
85
85
174
148
Swell 2
Height (m)
Direction
Period (s)
0.3
NNW
12
0.3
NNW
11
0.4
SSW
16
0.3
SSW
13
0.2
SSE
13
0.3
SSE
13
0.3
S
18
0.4
S
18
0.4
SSW
13
0.3
SSW
13
0.3
NNW
15
0.4
NW
13
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
0.1
NW
10
0.3
NW
15
Energy kJ
26
23
91
33
17
32
57
98
60
34
44
46
39
37
20
12
11
4
46
4
34
Swell 3
Height (m)
Direction
Period (s)
0.3
SSW
18
0.3
SSW
18
0.3
NNW
10
0.3
SSE
13
0.2
SSW
12
0.2
SSW
12
0.3
SSE
12
0.2
SSE
12
0.2
NNW
11
0.2
SSE
12
0.2
SSE
12
0.2
SSE
11
0.3
S
16
0.3
S
16
0.1
SW
20
0.1
SW
20
0.2
SSE
6
0.1
SW
19
0.1
NW
10
0.1
NW
17
0.1
SW
18
Energy kJ
63
62
22
34
14
14
29
14
12
14
14
12
46
46
16
15
3
15
4
11
12
Wind waves
Height (m)
Direction
Period (s)
2
ENE
8
2.2
ENE
8
3
ENE
8
3
ENE
8
3
ENE
8
3
ENE
9
2.5
ENE
8
2.4
ENE
8
2.4
ENE
8
2.5
ENE
8
2.5
ENE
8
2.5
ENE
8
2.3
ENE
8
2.2
ENE
8
2.4
ENE
8
2
ENE
8
2.1
ENE
8
1.8
ENE
8
1.7
ENE
8
1.9
ENE
7
2
ENE
7
Energy kJ
484
644
1009
1081
1125
1150
909
763
763
857
903
899
731
659
707
534
558
412
356
382
417
Nearest Offshore or Glassy
Rating
(10 max)
2
2
1
1
1
1
1
3
1
1
1
3
2
1
1
2
1
2
1
1
2
Distance (km)
42
46
126
130
128
46
156
204
39
127
156
48
48
126
42
48
126
48
44
42
33
Best forecast wave conditions in Oahu
Rating
(10 max)
2
2
2
2
3
2
2
2
2
1
2
2
Best forecast wave conditions in United States
Rating
(10 max)
3
3
3
3
1
3
3
3
2
1
2
3
2
1
3
2
2
3
1
2
3
Header Global
Rating
(10 max)
4
5
5
5
5
7
6
5
5
9
6
5
5
4
4
5
5
4
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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