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

information circle48hr Weather and Surf, issued 1 pm Monday 18 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
26.2° C
(Which is 1.0°C warmer than normal for this time of year)
Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Moderate rain (total 16mm), heaviest on Mon afternoon. Warm (max 27°C on Mon afternoon, min 24°C on Mon night). Wind will be generally light.

Mon
18
Tuesday
19
Wednesday
20
Thu
21
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
0
0
0
0
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)
0.6
SSW
19
0.6
SSW
16
0.7
SSW
14
0.7
SSW
14
0.7
SSW
14
0.8
SSW
14
0.8
SSW
14
0.6
SSW
14
0.7
SSW
14
0.6
SSW
14
0.8
SSW
15
0.8
SSW
14
0.8
SSW
14
0.5
N
5
0.7
SSW
14
0.6
SSW
14
0.6
SSW
14
0.4
SSW
18
0.4
SSW
18
1.3
NNE
6
0.5
S
16
0.7
N
6
0.5
S
16
0.5
S
16
Wave Graph
Metric surfscale
Energy kJ
0
0
0
0
0
0
0
0
0
0
0
0
0
14
0
0
0
0
0
0
0
31
0
0
Wind (km/h)
5
WSW
10
SSW
10
SSE
5
SSW
5
W
0
SE
5
E
5
SE
10
SW
10
W
5
WSW
0
E
5
S
5
NW
5
N
0
NNE
5
W
10
W
5
NNE
10
NE
5
NE
10
NNE
10
NE
10
NE
cross-on
cross
cross-off
cross
on
glassy
glassy
glassy
cross-on
cross-on
glassy
glassy
cross-off
glassy
glassy
glassy
glassy
on
glassy
cross-off
cross-off
cross
cross-off
cross-off
High Tide
5:37PM0.93m
5:26AM0.30m
6:28PM0.88m
6:32AM0.28m
7:22PM0.82m
7:56AM0.29m
Low Tide
10:03AM-0.01m
1:02AM0.14m
10:48AM0.03m
2:03AM0.14m
11:37AM0.09m
3:05AM0.14m
part cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
clear
clear
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
clear
clear
clear
part cloud
part cloud
clear
part cloud
part cloud
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:47
5:46
5:46
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:52
6:53
6:53
6:54
2
3
1
1
3
1
1
1
1
1
1
Temp °C
27
27
26
26
25
24
25
26
26
26
26
25
25
25
25
26
26
26
26
26
25
25
25
25
30
29
29
30
29
28
28
29
28
29
30
29
28
28
29
29
29
29
29
28
27
26
26
26
Swell 1
Height (m)
Direction
Period (s)
0.7
NNE
6
0.8
NNE
6
0.9
NNE
7
0.8
NNE
6
0.8
NNE
6
0.8
SSW
14
0.8
SSW
14
0.6
SSW
14
0.7
SSW
14
0.7
NNE
6
0.8
SSW
15
0.8
SSW
14
0.8
NNE
6
0.8
NNE
6
0.7
SSW
14
0.8
NNE
6
0.9
NNE
7
0.5
SSW
14
0.5
SSW
14
1.3
NNE
6
1.1
NNE
6
1
NNE
6
0.5
S
16
0.5
S
16
Energy kJ
34
51
68
41
41
229
236
163
180
33
242
239
47
34
213
40
68
107
104
149
91
70
134
132
Swell 2
Height (m)
Direction
Period (s)
0.6
SSW
15
0.6
SSW
16
0.7
SSW
14
0.7
SSW
14
0.7
SSW
14
0.7
NNE
6
0.7
NNE
6
0.6
NNE
6
0.6
NNE
6
0.6
SSW
14
0.7
NNE
6
0.7
NE
6
0.8
SSW
14
0.7
SSW
14
0.7
NNE
5
0.6
SSW
14
0.6
SSW
14
0.4
SSW
18
0.4
SSW
18
0.5
SSW
13
0.5
S
16
0.6
SSW
16
0.4
SSE
5
0.4
SSE
13
Energy kJ
174
191
166
163
163
31
27
22
23
160
33
39
233
210
23
158
156
103
103
102
135
203
7
57
Swell 3
Height (m)
Direction
Period (s)
0.6
SSW
19
0.4
SW
19
0.4
SSW
16
0.4
SSW
16
0.3
SSE
10
0.3
SSE
10
0.4
SW
18
0.4
SSW
17
0.4
SSW
17
0.4
SSW
17
0.3
SSE
9
0.3
SSE
10
0.3
SSE
9
0.3
SSE
9
0.3
SSE
9
0.4
SSW
18
0.3
SSW
18
0.3
SSE
9
0.3
SSE
9
0.4
SSW
17
0.4
SSW
13
0.5
S
4
0.4
SSW
13
0.4
SSW
13
Energy kJ
251
96
87
87
18
18
80
101
99
101
16
18
17
17
16
102
62
16
16
97
67
10
57
55
Wind waves
Height (m)
Direction
Period (s)
0.3
S
10
0.5
N
5
0.3
SSE
7
0.2
SSW
6
0.9
NNE
6
1.2
NNE
6
0.6
S
9
0.5
S
4
0.7
N
6
1
NNE
6
1.3
NNE
6
Energy kJ
17
14
9
4
49
96
55
8
31
70
132
Nearest Offshore or Glassy
Rating
(10 max)
2
1
1
2
1
1
2
2
2
2
1
1
1
1
2
2
1
1
1
1
1
2
2
1
Distance (km)
100
34
1
38
100
11
11
11
100
103
100
11
100
100
19
11
1
113
11
1
1
19
18
1
Best forecast wave conditions in Big Island
Rating
(10 max)
1
1
2
2
2
2
2
2
2
2
2
2
1
2
2
2
2
2
1
Best forecast wave conditions in United States
Rating
(10 max)
4
3
4
4
4
3
4
3
3
3
4
4
5
4
3
2
1
1
4
3
2
3
3
1
Header Global
Rating
(10 max)
4
4
4
4
4
4
4
4
5
5
5
5
4
5
4
5
5
4
4
5
4
4
4
4
  • 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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