Number Fours surfForecast / HAW – Oahu / USA

information circle16 Day Weather and Surf, issued 7 am Saturday 21 Mar 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
24.6° C
(Which is normal for this time of year)

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 Sunday (Mar 22) at 5AM. The primary swell is predicted to be 0.7m and 17s period. 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 2.0m 8s and forecast to arrive on Thursday (Mar 26) 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 2.3m 8s period and expected on Tuesday (Mar 24) at 11PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Sun 22nd Mar)2.5ft (0.7m) 17s
Best Surf 5AM (Sun 22nd Mar)2.5ft (0.7m) 17s
Most Powerful 2AM (Thu 26th Mar)6.5ft (2.0m) 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 Heavy rain (total 27mm), heaviest during Sat morning. Warm (max 25°C on Sat morning, min 22°C on Sun night). Winds increasing (calm on Sun night, fresh winds from the NE by Mon afternoon).

Days 3-6 Weather Summary Mostly dry. Warm (max 23°C on Tue morning, min 22°C on Tue morning). Mainly strong winds.

Saturday
21
Sunday
22
Monday
23
Tuesday
24
Wednesday
25
Thursday
26
Friday
27
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
1
1
1
2
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.6
SSW
0.7
SW
0.7
SSW
0.7
SSW
0.7
SSW
0.7
SW
0.7
SSW
0.6
SSW
0.6
SSW
0.6
SSW
0.4
SSW
1.8
ENE
0.4
SW
0.4
SW
2
ENE
1.7
ENE
0.4
SW
0.4
SW
0.5
S
0.5
S
0.5
S
Period(s) (?)181817161616151414141481313881313141413
Wave
Graph
(?)Metric surfscale
Energy kJ (?)211319267229226255193140138134783924342488347434110610687
Wind
(km/h)
20
SW
10
SW
10
WSW
10
SSW
10
SSW
10
NNE
25
NE
30
NE
20
NE
30
NE
35
NE
35
NE
35
ENE
35
ENE
30
NE
30
NE
35
NE
35
NE
35
NE
35
NE
35
NE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on
cross-
on
cross-
on
cross-
on
cross-
on
offcross-
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
/ height (m)
6:25PM
0.57
5:50AM
0.24
7:25PM
0.58
6:32AM
0.17
8:35PM
0.58
7:40AM
0.12
9:53PM
0.58
10:09AM
0.09
11:08PM
0.58
12:04PM
0.13
12:11AM
0.58
1:06PM
0.19
1:03AM
0.57
Low Tide
/ height (m)
11:18AM
-0.07
1:13AM
0.10
11:50AM
-0.06
2:50AM
0.12
12:28PM
-0.04
5:02AM 1:19PM
0.10 -0.00
6:33AM
0.06
2:39PM
0.03
7:17AM
0.03
4:22PM
0.05
7:48AM
0.00
5:51PM
0.05
Saturday
21
Sunday
22
Monday
23
Tuesday
24
Wednesday
25
Thursday
26
Friday
27
Sunrise6:33--6:33--6:31--6:31--6:31--6:30--6:28--
Sunset-6:42--6:43--6:43--6:43--6:43--6:44--6:44-
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
mod rain
thunderstorm
thunderstorm
part cloud
part cloud
clear
part cloud
cloud
part cloud
clear
clear
clear
part cloud
cloud
clear
part cloud
Rain (mm)
53352612-------------
Temp. °C252525242523232322232322222322232322222222
Feels °C (?)252628272726212020201918171918191918171717
  • 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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