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Surf Forecasts:

Waimanu Bay surfForecast / HAW – Big Island / USA

information circle12 Day Weather and Surf, issued 7 am Friday 05 Sep 2025 HST
Forecast update in hr  min  s Forecast update imminent
Waimanu Bay surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Waimanu Bay sea temperature is
26.5° C
 (Which is normal for this time of year)

Best Forecast Surf Conditions for Waimanu Bay this week:

The surf forecast for Waimanu Bay over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Sep 06) at 5AM. The primary swell is predicted to be 0.5m and 12s period with a secondary swell of 0.4m and 10s. Another secondary swell of 0.7m and 6s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Waimanu Bay in the next 12 days are 2.4m 12s and forecast to arrive on Tuesday (Sep 09) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 15s period and expected on Thursday (Sep 11) at 5AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Sat 6th Sep)1.5ft (0.5m) 12s
Best Surf 8AM (Sun 7th Sep)4ft (1.2m) 12s
Most Powerful 5AM (Tue 9th Sep)8ft (2.4m) 12s

Table - best surf conditions forecast for Waimanu Bay over the next 12 days.

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

Short Range Forecast Some drizzle, heaviest during Sun afternoon. Warm (max 27°C on Fri morning, min 23°C on Sun night). Wind will be generally light.

Days 3-6 Weather Summary Light rain (total 7mm), mostly falling on Mon afternoon. Warm (max 27°C on Wed morning, min 24°C on Mon morning). Wind will be generally light.

Friday
05
Saturday
06
Sunday
07
Monday
08
Tuesday
09
Wednesday
10
Thursday
11
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
2
1
0
1
1
1
2
2
2
3
1
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.4
NW
0.4
NNW
0.5
E
0.9
E
1.1
E
1.2
E
1.3
E
1.1
E
1.2
E
1.4
E
1.6
E
2.3
E
2.5
ENE
1.9
ENE
1.8
E
2
E
2
E
1.4
E
1.3
E
1.6
E
1.4
E
Period(s) (?)11111111141313131313121210109888888
Wave
Graph
(?)Metric surfscale
Energy (?)7711216033252658362850454668980615191467894983569487267228307242
Wind
(km/h)
15
ENE
15
ENE
10
ESE
10
ENE
15
ENE
5
ESE
10
ENE
15
E
15
E
15
ENE
15
ENE
15
E
10
N
5
NNW
5
ESE
15
E
20
E
20
E
20
ENE
20
ENE
20
E
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		cross-
on		crosscross-
on		cross-
on		crosscross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		glasscross-
on		crosscrosscross-
on		cross-
on		cross
High Tide
/ height (m)
1:58PM
0.93
1:45AM
0.60
2:26PM
0.93
2:27AM
0.67
2:54PM
0.91
3:10AM
0.73
3:22PM
0.85
3:55AM
0.78
3:49PM
0.78
4:43AM
0.81
4:16PM
0.70
5:37AM
0.82
4:41PM
0.61
Low Tide
/ height (m)
8:30PM
0.24
7:38AM
0.09
8:52PM
0.20
8:21AM
0.11
9:16PM
0.16
9:05AM
0.15
9:42PM
0.12
9:51AM
0.22
10:10PM
0.10
10:42AM
0.30
10:41PM
0.10
11:43AM
0.38
11:16PM
0.11
Friday
05
Saturday
06
Sunday
07
Monday
08
Tuesday
09
Wednesday
10
Thursday
11
Sunrise6:07--6:07--6:07--6:07--6:07--6:07--6:07--
Sunset-6:34--6:32--6:31--6:30--6:30--6:30--6:29-
clear
clear
clear
clear
clear
clear
clear
rain showers
clear
clear
rain showers
rain showers
rain showers
clear
clear
clear
thunderstorm
clear
clear
clear
part cloud
Rain (mm)
-------1--131---2----
Temp. °C272725272725262625262625262625272625272725
Feels °C (?)262725272826272826272827282828292725272725
  • 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 Cross-on wind has become light (light winds from the E at Kapulena wx 12 km from Waimanu Bay). 0.7m 6s windswell from the E with a 0.6m 9s swell from the ENE and a 0.4m 9s swell from the NE as well as a 0.4m 11s groundswell from the NNW. 4 swells combining to make bigger set waves.

    1 hour 0 minutes ago Waimanu Bay
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1 h 0 min ago

8 km/h
E
Clean
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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 Waimanu Bay 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 Waimanu Bay at:
surf-forecast.com

Information about the Waimanu Bay Surf forecast

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

Waimanu Bay is 74 km (46 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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