Waimanu Bay surfForecast / HAW – Big Island / USA

information circle16 Day Weather and Surf, issued 1 am Thursday 21 May 2026 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
26.0° C
(Which is slightly warmer than usual)

Best Forecast Surf Conditions for Waimanu Bay this week:

The most powerful waves expected at Waimanu Bay in the next 16 days are 2.4m 9s and forecast to arrive on Thursday (May 21) at 11PM. 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 13s period and expected on Thursday (May 21) at 8AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11PM (Thu 21st May)8ft (2.4m) 9s

Table - best surf conditions forecast for Waimanu Bay over the next 16 days.


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Some drizzle, heaviest during Sat night. Warm (max 25°C on Thu morning, min 22°C on Thu night). Mainly fresh winds.

Days 4-6 Weather Summary

Light rain (total 3mm), mostly falling on Sun afternoon. Warm (max 25°C on Sun morning, min 22°C on Sun night). Mainly fresh winds.

Thursday
21
Friday
22
Saturday
23
Sunday
24
Monday
25
Tuesday
26
Wednesday
27
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.3
ENE
9
2.2
ENE
9
2.3
ENE
9
2
ENE
9
2.1
ENE
8
2
ENE
8
2
ENE
8
2.1
NE
9
2.1
NE
8
1.9
NE
8
2
NE
8
1.8
NE
8
1.7
ENE
8
1.6
NE
8
1.5
ENE
8
1.7
ENE
7
1.7
ENE
7
1.8
ENE
7
1.7
ENE
7
1.7
ENE
7
1.6
ENE
7
Wave Graph
Metric surfscale
Energy kJ
809
744
793
601
601
567
567
664
613
522
540
428
348
298
257
289
289
334
327
305
268
Wind (km/h)
30
E
35
ENE
25
ENE
30
ENE
30
ENE
25
E
30
ENE
30
ENE
25
E
30
ENE
30
ENE
25
E
25
E
25
ENE
25
E
25
ENE
30
ENE
25
E
25
E
30
E
20
E
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross-on
cross-on
cross
High Tide
7:31PM0.88m
7:44AM0.40m
8:25PM0.81m
9:55AM0.45m
9:17PM0.74m
11:27AM0.55m
10:08PM0.68m
12:22PM0.66m
10:55PM0.62m
1:02PM0.75m
11:38PM0.57m
1:36PM0.83m
00:18AM0.54m
Low Tide
11:36AM0.17m
3:16AM0.30m
12:39PM0.28m
4:06AM0.27m
2:11PM0.37m
4:45AM0.23m
4:07PM0.43m
5:18AM0.19m
5:47PM0.45m
5:47AM0.16m
7:02PM0.43m
6:14AM0.13m
7:59PM0.40m
clear
clear
part cloud
part cloud
clear
clear
clear
part cloud
rain showers
clear
rain showers
rain showers
part cloud
part cloud
part cloud
clear
clear
clear
part cloud
part cloud
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:43
5:43
5:43
5:43
5:43
5:43
5:41
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:53
6:53
6:53
6:54
6:54
6:55
6:55
1
2
1
Temp °C
25
25
23
24
24
22
24
24
23
25
24
23
24
24
23
25
25
23
25
24
23
21
21
19
21
21
18
20
20
21
22
22
21
22
22
20
23
23
21
23
23
20
Swell 1
Height (m)
Direction
Period (s)
0.3
NNW
10
0.3
NNW
10
0.2
NNW
10
0.1
NW
11
0.2
NNW
10
2
ENE
8
0.4
NW
11
0.4
NNW
16
0.6
NNW
15
0.6
NNW
13
0.6
NNW
12
1.8
NE
8
0.4
NNW
11
0.4
NW
11
1.5
ENE
8
0.3
NW
10
0.2
NNW
10
0.4
NW
17
0.5
NW
15
0.6
NW
14
0.6
NW
13
Energy kJ
21
19
9
5
11
567
29
102
142
116
103
428
48
30
257
16
10
106
110
130
111
Swell 2
Height (m)
Direction
Period (s)
0.2
SSE
13
0.2
SSE
13
0.1
SE
12
0.1
NW
9
0.1
SE
12
0.4
NW
11
0.2
NNW
18
0.4
NW
10
0.3
NW
10
0.2
NNW
10
0.1
S
11
0.5
NW
12
0.5
NW
11
0.5
NW
11
0.4
NW
11
0.1
N
14
0.1
N
13
0.2
NNW
10
0.2
NNW
11
0.1
NW
9
0.1
N
12
Energy kJ
17
16
6
3
6
30
31
28
16
9
2
69
60
59
29
4
3
9
11
3
3
Swell 3
Height (m)
Direction
Period (s)
0.2
SSE
12
0.1
N
21
0.1
SE
12
0.4
NW
10
0.4
NW
10
0.3
NW
10
0.1
S
15
0.4
NW
11
0.1
N
14
0.1
NW
20
0.2
NNW
12
0.1
N
11
0.1
N
12
Energy kJ
14
8
5
28
26
15
5
29
4
15
14
2
3
Wind waves
Height (m)
Direction
Period (s)
2.3
ENE
9
2.2
ENE
9
2.3
ENE
9
2
ENE
9
2.1
ENE
8
2
ENE
8
2.1
NE
9
2.1
NE
8
1.9
NE
8
2
NE
8
1.7
ENE
8
1.6
NE
8
1.7
ENE
7
1.7
ENE
7
1.8
ENE
7
1.7
ENE
7
1.7
ENE
7
1.6
ENE
7
Energy kJ
809
744
793
601
601
567
664
613
522
540
348
298
289
289
334
327
305
268
Nearest Offshore or Glassy
Rating
(10 max)
1
2
1
3
1
3
3
1
1
3
1
1
2
1
1
2
1
2
3
1
1
Distance (km)
58
68
58
462
66
60
470
58
66
77
58
58
77
66
69
77
66
70
77
66
69
Best forecast wave conditions in Big Island
Rating
(10 max)
1
2
2
2
3
2
2
3
1
1
2
1
1
2
1
2
3
2
1
Best forecast wave conditions in United States
Rating
(10 max)
3
2
3
3
2
4
3
2
3
3
1
3
4
1
3
2
1
4
3
2
4
Header Global
Rating
(10 max)
5
5
7
6
8
6
8
6
5
5
5
4
5
5
4
4
5
6
5
5
5
  • 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 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 16 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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