Mahai'ula Bay surfForecast / HAW – Big Island / USA

information circle48hr Weather and Surf, issued 1 pm Tuesday 12 May 2026 HST
Forecast update in hr  min  s Forecast update imminent
Mahai'ula Bay surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Mahai'ula Bay sea temperature is
25.9° C
(Which is slightly warmer than usual)

How big are the waves at Mahai'ula Bay today?

The current surf forecast for Mahai'ula Bay at 6PM is: 0.3m 2s primary swell from a West-southwest direction (forecast issued at 01:00pm May 12). An open ocean swell of 0.8m 6s is not directed at the surf break, a second open ocean swell of 0.4m 15s is not directed at the surf break. The wind direction is predicted to be glassy.

Time (HST) & DateWave HeightWave Period
Morning (12 May)1.5ft (0.4m)11s
Afternoon (12 May)1ft (0.3m)11s
Evening (12 May)1.5ft (0.4m)10s

Table - waves today at Mahai'ula Bay. (Swell directed towards the surf break)


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Mostly dry. Warm (max 26°C on Wed afternoon, min 24°C on Tue night). Wind will be generally light.

Tue
12
Wednesday
13
Thursday
14
Fri
15
11 AM
2 PM
5 PM
8 PM
11 PM
2 AM
5 AM
8 AM
11 AM
2 PM
5 PM
8 PM
11 PM
2 AM
5 AM
8 AM
11 AM
2 PM
5 PM
8 PM
11 PM
2 AM
5 AM
8 AM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
Swell
Height Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
0.4
NW
11
0.3
NW
11
0.3
WSW
2
0.4
NW
10
0.4
SSW
15
0.4
SSW
15
0.4
SSW
14
0.5
S
14
0.3
SSW
14
0.3
SW
15
0.9
NNE
6
0.3
SW
15
0.8
NNE
6
0.3
SW
14
0.2
WNW
2
0.3
NW
16
0.3
NW
16
0.4
NW
15
0.4
NW
15
0.5
NW
15
0.5
NW
14
0.5
NW
14
0.6
NW
13
0.5
NW
13
Wave Graph
Metric surfscale
Energy kJ
42
18
1
28
0
0
0
0
0
34
0
34
0
33
1
42
41
58
77
106
102
93
113
87
Wind (km/h)
5
WNW
5
SSW
0
WNW
0
N
0
ESE
5
SE
5
NE
5
S
5
W
5
WNW
5
NNE
5
SE
0
S
5
NNW
5
NNE
5
NE
5
W
5
W
5
WSW
5
SSW
5
SSW
0
SW
0
N
0
SE
glassy
cross
glassy
glassy
glassy
glassy
glassy
glassy
cross-on
glassy
cross
glassy
glassy
glassy
cross
glassy
cross-on
cross-on
cross-on
cross
glassy
glassy
glassy
glassy
High Tide
1:21PM0.62m
00:39AM0.54m
1:59PM0.73m
1:26AM0.50m
2:38PM0.82m
2:12AM0.45m
Low Tide
7:16PM0.27m
7:03AM0.05m
8:19PM0.22m
7:34AM0.01m
9:17PM0.18m
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
part cloud
clear
clear
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:48
5:48
5:48
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:51
6:51
6:52
6:52
Temp °C
25
25
25
25
24
24
24
24
25
25
26
25
24
24
24
25
26
26
26
25
24
24
24
24
27
27
27
28
27
27
26
26
27
27
28
27
27
26
26
26
28
28
28
27
27
27
28
27
Swell 1
Height (m)
Direction
Period (s)
0.8
NNE
6
0.8
NNE
6
0.8
NNE
6
0.8
NNE
6
0.8
NNE
6
0.8
NNE
6
0.7
NNE
6
0.7
NNE
6
0.6
NNE
6
0.8
NNE
6
0.9
NNE
6
0.9
NNE
6
0.8
NNE
6
0.7
NNE
6
0.7
NNE
6
0.7
NNE
6
0.7
NNE
6
0.7
NNE
7
0.7
NNE
7
0.7
NNE
7
0.7
NNE
7
0.7
NNE
7
0.7
NNE
7
0.5
NW
13
Energy kJ
34
40
41
42
38
38
32
32
24
47
60
53
42
33
33
34
36
38
38
40
38
40
40
87
Swell 2
Height (m)
Direction
Period (s)
0.4
SSW
16
0.5
S
16
0.4
S
16
0.4
S
15
0.4
SSW
15
0.4
SSW
15
0.4
SSW
14
0.5
S
14
0.3
SSW
14
0.4
SSW
14
0.3
S
13
0.3
SSW
13
0.3
S
10
0.4
S
13
0.4
S
13
0.3
S
12
0.3
S
12
0.4
NW
15
0.4
NW
15
0.5
NW
15
0.5
NW
14
0.5
NW
14
0.6
NW
13
0.4
SW
16
Energy kJ
83
127
76
70
71
71
70
106
40
62
31
35
19
54
53
26
26
58
77
106
102
93
113
64
Swell 3
Height (m)
Direction
Period (s)
0.4
NW
11
0.3
NW
11
0.3
SSW
14
0.3
SSW
14
0.4
S
15
0.3
S
15
0.3
S
14
0.3
SSE
9
0.3
S
14
0.3
SW
15
0.3
SSW
13
0.3
SW
15
0.3
S
13
0.3
SW
14
0.3
S
5
0.3
NW
16
0.3
NW
16
0.3
S
12
0.3
S
12
0.4
SSE
12
0.5
S
12
0.5
S
12
0.4
SSE
11
0.3
S
5
Energy kJ
42
18
41
41
68
38
37
17
32
34
35
34
30
33
4
42
41
25
25
47
69
69
43
4
Wind waves
Height (m)
Direction
Period (s)
0.3
WSW
2
0.4
NW
10
0.2
S
4
0.2
S
4
0.3
SSE
10
0.3
NW
2
0.2
WNW
2
0.2
S
4
0.3
WSW
2
0.5
NNE
7
Energy kJ
1
28
1
1
22
1
1
1
1
26
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Distance (km)
1
100
103
1
11
11
11
38
100
1
11
1
18
1
19
1
100
136
38
21
0
0
0
0
Best forecast wave conditions in Big Island
Rating
(10 max)
1
1
1
1
1
2
2
2
1
1
1
2
2
1
1
2
1
1
2
1
2
2
Best forecast wave conditions in United States
Rating
(10 max)
2
2
3
3
2
2
2
2
1
1
1
4
4
4
4
3
3
3
3
4
4
4
4
3
Header Global
Rating
(10 max)
9
9
9
9
9
8
7
9
9
9
9
5
5
5
5
5
4
5
5
5
5
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)
Map placeholder

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