Nanakuli Blackrocks surfForecast / HAW – Oahu / USA

information circle12 Day Weather and Surf, issued 1 am Thursday 25 Dec 2025 HST
Forecast update in hr  min  s Forecast update imminent
Nanakuli Blackrocks surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Nanakuli Blackrocks sea temperature is
25.7° C
(Which is slightly warmer than usual)


Best Forecast Surf Conditions for Nanakuli Blackrocks this week:

The surf forecast for Nanakuli Blackrocks over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Dec 25) at 8AM. The primary swell is predicted to be 0.6m and 8s period. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Nanakuli Blackrocks in the next 12 days are 2.4m 15s and forecast to arrive on Tuesday (Dec 30) 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 1.9m 14s period and expected on Wednesday (Dec 31) at 11PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Thu 25th Dec)2ft (0.6m) 8s
Best Surf 2PM (Mon 29th Dec)3.5ft (1.1m) 16s
Most Powerful 8PM (Tue 30th Dec)8ft (2.4m) 15s

Table - best surf conditions forecast for Nanakuli Blackrocks over the next 12 days.

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Mostly dry. Warm (max 25°C on Thu afternoon, min 23°C on Thu morning). Wind will be generally light.

Days 3-6 Weather Summary Some drizzle, heaviest during Tue night. Warm (max 25°C on Sun afternoon, min 22°C on Tue night). Wind will be generally light.

Thursday
25
Friday
26
Saturday
27
Sunday
28
Monday
29
Tuesday
30
Wednesday
31
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
1
1
1
0
0
0
0
0
0
2
2
3
3
4
4
4
4
4
4
4
4
Swell
Height Map
Wave Height (m) & direction (?)
0.4
SW
0.4
SW
0.7
SSE
0.6
SSE
0.9
NNE
0.7
SSE
0.7
SSE
0.8
SSE
0.6
SSE
0.9
WNW
0.9
WNW
1.5
NW
1.5
NW
1.4
NNW
2
NNW
2.2
NNW
2.3
NNW
2.4
NNW
2.3
NNW
2.2
NNW
1.8
NNW
Period(s) (?)131376118886121212111515141515141413
Wave
Graph
(?)Metric surfscale
Energy kJ (?)444242270585976262452265835348631648188723832493209818681197
Wind
(km/h)
25
E
25
ENE
15
E
10
ESE
15
E
5
SSE
10
SW
10
SSW
5
WSW
5
NNE
5
N
5
SE
5
ENE
5
ENE
15
E
15
ENE
10
ESE
10
NE
15
NE
25
NE
15
NE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offoffoffcross-
off
cross-
off
glassoncross-
on
glassglasscross-
off
glassoffglassoffoffcross-
off
offoffoffoff
High Tide
/ height (m)
8:49PM
0.31
7:38AM
0.56
10:19PM
0.39
8:13AM
0.48
11:28PM
0.49
8:56AM
0.40
12:22AM
0.59
9:58AM
0.33
1:10AM
0.68
11:25AM
0.26
1:56AM
0.76
12:45PM
0.23
2:41AM
0.82
Low Tide
/ height (m)
2:46PM
0.12
12:35AM
0.26
3:16PM
0.10
2:25AM
0.34
3:48PM
0.08
5:08AM
0.36
4:24PM
0.06
7:34AM
0.31
5:06PM
0.03
8:55AM
0.25
5:52PM
0.01
9:44AM
0.19
6:40PM
-0.02
Thursday
25
Friday
26
Saturday
27
Sunday
28
Monday
29
Tuesday
30
Wednesday
31
Sunrise7:07--7:07--7:07--7:07--7:09--7:09--7:09--
Sunset-5:57--5:58--5:58--5:59--5:59--6:00--6:00-
clear
part cloud
clear
part cloud
part cloud
clear
part cloud
clear
part cloud
cloud
cloud
cloud
cloud
cloud
cloud
part cloud
part cloud
rain showers
clear
clear
clear
Rain (mm)
-----------------1---
Temp. °C242523242524242524242524252524242523252623
Feels °C (?)212221242525252626262725272825242724242422
  • 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 Nanakuli Blackrocks Surf forecast

The above surf forecast table for Nanakuli Blackrocks provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Nanakuli Blackrocks can be found by selecting the local surf guide option on the grey menu. Our Nanakuli Blackrocks 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 (Nanakuli Blackrocks) 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 Nanakuli Blackrocks 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.

Nanakuli Blackrocks is 6 km (4 miles) from Makakilo City. If you plan a vacation in Oahu, look for hotels and other accommodation in Makakilo City. Makakilo City has rooms for a wide range of budgets as well as car hire and transport links.

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