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Surf Forecasts:

Kahuku Ranch surfForecast / HAW – Big Island / USA

information circle12 Day Weather and Surf, issued 7 am Wednesday 17 Sep 2025 HST
Forecast update in hr  min  s Forecast update imminent
Kahuku Ranch surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Kahuku Ranch sea temperature is
26.7° C
 (Which is normal for this time of year)

Best Forecast Surf Conditions for Kahuku Ranch this week:

The surf forecast for Kahuku Ranch over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Sep 19) at 5AM. The primary swell is predicted to be 0.4m and 13s period. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Kahuku Ranch in the next 12 days are 0.9m 16s and forecast to arrive on Saturday (Sep 20) at 8AM. 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 7s period and expected on Wednesday (Sep 17) at 11PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Fri 19th Sep)1.5ft (0.4m) 13s
Best Surf 2PM (Fri 19th Sep)2ft (0.6m) 18s
Most Powerful 8AM (Sat 20th Sep)3ft (0.9m) 16s

Table - best surf conditions forecast for Kahuku Ranch over the next 12 days.

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

Short Range Forecast Light rain (total 2mm), mostly falling on Fri night. Warm (max 27°C on Wed morning, min 25°C on Wed night). Winds decreasing (fresh winds from the ENE on Wed night, light winds from the NE by Fri morning).

Days 3-6 Weather Summary Light rain (total 3mm), mostly falling on Sat afternoon. Warm (max 27°C on Sat morning, min 24°C on Sun night). Mainly strong winds.

Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.4
SSW
0.3
SW
0.4
SSW
0.3
SW
0.4
SW
0.4
SW
0.4
SSW
0.7
SSW
0.7
SSW
0.9
SSW
0.9
SSW
0.9
SSW
0.8
SSW
0.8
SSW
0.6
SSW
0.5
SSW
0.5
SSW
0.5
SSW
0.4
SSW
0.8
SE
0.5
S
Period(s) (?)12151214141418181616151413131313121215813
Wave
Graph
(?)Metric surfscale
Energy kJ (?)493550325147107322269429381366204201135908582716992
Wind
(km/h)
30
E
30
E
25
ENE
35
E
25
ENE
20
ENE
10
ESE
20
E
15
ENE
30
E
25
E
30
ENE
35
E
35
E
35
E
35
E
40
E
30
ENE
30
E
30
E
25
ENE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
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
/ height (m)
1:21PM
0.89
1:43AM
0.54
2:00PM
0.90
2:20AM
0.62
2:32PM
0.89
2:53AM
0.70
3:01PM
0.86
3:25AM
0.76
3:28PM
0.82
3:55AM
0.81
3:54PM
0.76
4:26AM
0.84
4:18PM
0.70
4:57AM
0.85
Low Tide
/ height (m)
8:14PM
0.17
7:16AM
0.15
8:38PM
0.14
8:02AM
0.13
9:00PM
0.11
8:43AM
0.12
9:21PM
0.09
9:22AM
0.13
9:42PM
0.08
9:59AM
0.15
10:02PM
0.08
10:35AM
0.18
10:23PM
0.08
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Sunrise6:09--6:09--6:11--6:11--6:11--6:11--6:11--
Sunset-6:22--6:22--6:21--6:20--6:20--6:19--6:17-
clear
clear
part cloud
part cloud
part cloud
cloud
part cloud
part cloud
thunderstorm
clear
rain showers
rain showers
clear
clear
clear
clear
clear
rain showers
clear
clear
clear
Rain (mm)
--------2-11-----1---
Temp. °C272725272725272726272725262725262725272725
Feels °C (?)242422242423292828252624222423222323242422
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Eyeball surf reportRecent Eyeball Surf Reports for HAW - Big Island

  1. weather stationWind Update Continuing clean conditions at Kahuku Ranch (calm at Captain Cook 43 km from Kahuku Ranch). 0.3m 12s groundswell from the SSW with a 0.2m 15s groundswell, also from the SSW. 2 swells combining to make bigger set waves.

    1 hour 42 minutes ago Kahuku Ranch
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43 km away, 1 h 42 min ago

5 km/h
NW
0.0
26.7
Air / Water (°C)
Please reload the page to see if there are any updates.

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 Kahuku Ranch 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 Kahuku Ranch at:
surf-forecast.com

Information about the Kahuku Ranch Surf forecast

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

Kahuku Ranch is 107 km (66 miles) from Hilo. If you plan a vacation in Big Island, look for hotels and other accommodation in Hilo. Hilo has rooms for a wide range of budgets as well as car hire and transport links.

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