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Surf Forecasts:

Nanakuli Blackrocks surfForecast / HAW – Oahu / USA

information circle12 Day Weather and Surf, issued 1 pm Friday 29 Aug 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
27.1° C
 (Which is normal for this time of year)

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 Friday (Aug 29) at 5PM. The primary swell is predicted to be 0.7m and 15s period with a secondary swell of 0.6m and 9s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Nanakuli Blackrocks in the next 12 days are 0.7m 15s and forecast to arrive on Friday (Aug 29) 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 1.0m 11s period and expected on Tuesday (Sep 02) at 2AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 5PM (Fri 29th Aug)2.5ft (0.7m) 15s
Best Surf 5PM (Fri 29th Aug)2.5ft (0.7m) 15s
Most Powerful 5PM (Fri 29th Aug)2.5ft (0.7m) 15s

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

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Mostly dry. Warm (max 28°C on Fri afternoon, min 24°C on Fri night). Wind will be generally light.

Days 3-6 Weather Summary Mostly dry. Warm (max 27°C on Mon afternoon, min 24°C on Mon night). Wind will be generally light.

Fri
29
Saturday
30
Sunday
31
Monday
01
Tuesday
02
Wednesday
03
Thursday
04
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
2
2
1
1
1
1
1
0
0
0
0
2
1
2
2
1
1
1
0
1
1
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.7
SSW
0.7
S
0.6
S
0.6
S
0.5
S
0.6
SSE
0.7
SSE
0.6
NNW
0.6
NNW
0.7
SE
0.7
SSE
0.6
NW
0.7
NW
0.8
NW
0.8
NW
0.7
NW
0.6
NW
0.6
NW
0.6
NW
0.6
NNW
0.5
NW
Period(s) (?)15151414141010889914131312121111111110
Wave
Graph
(?)Metric surfscale
Energy (?)280268176181159152194484806523417625120814112512815011893
Wind
(km/h)
10
ESE
10
E
10
SE
10
SE
5
ENE
5
S
5
SE
5
ENE
10
ESE
5
E
15
ENE
5
E
10
NE
10
E
15
E
10
SE
15
ENE
15
E
25
ENE
20
E
25
ENE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		offcross-
off		cross-
off		offglassglassoffcross-
off		offoffcross-
off		offoffcross-
off		cross-
off		offoffoffoffoff
High Tide
/ height (m)
9:46AM
0.52
11:09AM
0.55
12:12PM
0.59
11:37PM
0.19
12:58PM
0.63
12:48AM
0.22
1:36PM
0.67
1:33AM
0.25
2:10PM
0.70
2:12AM
0.30
Low Tide
/ height (m)
12:54AM
0.13
1:35AM
0.14
2:53AM
0.14
9:12PM 4:30AM
0.18 0.13
8:59PM
0.17
5:43AM
0.11
9:07PM
0.15
6:40AM
0.09
9:20PM
0.13
7:31AM
0.07
Fri
29
Saturday
30
Sunday
31
Monday
01
Tuesday
02
Wednesday
03
Thursday
04
Sunrise--6:15--6:15--6:15--6:16--6:16--6:16--6:16
Sunset6:51--6:50--6:49--6:47--6:47--6:46--6:45--
part cloud
part cloud
clear
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
clear
clear
part cloud
clear
clear
part cloud
clear
part cloud
Rain (mm)
---------------------
Temp. °C282627272626262526272526272626272527272527
Feels °C (?)262528272828292928292627282725272526252425
  • 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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Eyeball surf reportRecent Eyeball Surf Reports for HAW - Oahu

  1. weather stationWind Update light winds from the NE at Saint Louis Heights wx mean that is clean at Waikiki. 0.5m 11s groundswell from the SSE with a 0.4m 13s groundswell from the S and a 0.2m 13s groundswell from the SSW. 3 swells combining to make bigger set waves.

    27 minutes ago Waikiki
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1 h 44 min ago

15 km/h
E
Cross-Off
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FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Nanakuli Blackrocks surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.

View detailed surf forecast for Nanakuli Blackrocks at:
surf-forecast.com

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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