Grandma's surf break

Grandma's surfForecast / HAW – Maui / USA

information circle48hr Weather and Surf, issued 1 am Friday 15 May 2026 HST
Forecast update in hr  min  s Forecast update imminent
Grandma's surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Grandma's sea temperature is
25.3° C
(Which is normal for this time of year)

How big are the waves at Grandma's today?

The current surf forecast for Grandma's at 10AM is: 0.4m 16s primary swell from a South-southwest direction (forecast issued at 01:00am May 15). An open ocean swell of 0.6m 13s is not directed at the surf break, a second open ocean swell of 1.6m 6s is not directed at the surf break. The wind direction is predicted to be glassy.

Time (HST) & DateWave HeightWave Period
Morning (15 May)1.5ft (0.4m)16s
Afternoon (15 May)1.5ft (0.4m)16s
Evening (15 May)1.5ft (0.4m)16s

Table - waves today at Grandma's. (Swell directed towards the surf break)


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Light rain (total 6mm), mostly falling on Fri afternoon. Warm (max 27°C on Sun afternoon, min 24°C on Fri morning). Wind will be generally light.

Friday
15
Saturday
16
Sunday
17
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
11 AM
2 PM
5 PM
8 PM
11 PM
Rating
(10 max)
1
1
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
Swell
Height Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
0.6
NW
14
0.4
SW
16
0.4
SSW
16
0.5
NW
13
0.5
NW
13
0.4
SSW
16
0.4
SSW
16
0.4
SW
16
0.3
SW
16
0.4
SW
14
0.5
SW
16
0.4
SW
15
0.4
SW
14
0.4
SW
14
0.4
SW
14
0.4
SW
14
0.4
SW
13
0.4
SSW
16
0.5
SSW
16
0.5
SSW
15
0.5
SSW
15
0.6
SSW
15
0.6
SSW
15
0.7
SSW
15
Wave Graph
Metric surfscale
Energy kJ
149
67
102
99
99
99
99
66
40
49
121
54
54
53
54
57
57
89
138
133
131
146
146
188
Wind (km/h)
5
NNE
5
NNE
0
WSW
5
S
5
SW
0
SW
10
NNW
5
NNE
5
NNE
5
NNE
5
NNE
5
WSW
5
WNW
5
SSE
5
SSW
5
NNW
5
WNW
5
SW
5
NNE
5
N
5
NE
10
NE
15
NNE
10
NNE
glassy
cross-off
glassy
cross-on
glassy
glassy
cross-off
glassy
glassy
glassy
glassy
glassy
glassy
glassy
glassy
cross-off
glassy
glassy
glassy
glassy
off
off
cross-off
off
High Tide
2:32AM0.34m
3:32PM0.79m
3:19AM0.29m
4:17PM0.83m
4:09AM0.25m
5:04PM0.84m
Low Tide
8:10AM-0.10m
10:14PM0.05m
8:49AM-0.11m
11:12PM0.04m
9:30AM-0.10m
part cloud
part cloud
clear
part cloud
thunderstorm
thunderstorm
thunderstorm
clear
clear
clear
clear
clear
thunderstorm
thunderstorm
clear
clear
clear
part cloud
clear
part cloud
clear
part cloud
clear
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>
6:55
6:55
6:57
1
2
1
1
1
Temp °C
24
24
24
26
26
26
25
24
24
24
25
26
26
26
26
25
24
24
24
26
27
26
25
24
27
26
27
28
29
29
27
27
27
27
28
29
29
29
30
28
28
28
27
29
30
28
27
27
Swell 1
Height (m)
Direction
Period (s)
0.6
NW
14
0.6
NNW
13
0.6
NNW
13
0.5
NW
13
0.5
NW
13
0.5
NW
12
0.5
NW
12
0.4
NW
12
0.4
NW
12
0.4
SW
14
0.5
SW
16
0.4
SW
15
0.4
SW
14
0.4
SW
14
0.4
SW
14
0.4
SW
14
0.3
SSW
17
0.4
SW
14
0.5
SSW
16
0.5
SSW
15
0.5
SSW
15
0.6
SSW
15
0.6
SSW
15
0.7
SSW
15
Energy kJ
149
120
116
83
79
73
71
36
35
49
121
54
54
53
53
53
57
72
138
133
131
146
146
188
Swell 2
Height (m)
Direction
Period (s)
0.4
SE
6
0.4
SW
16
0.4
SSW
16
0.4
SSW
16
0.4
SSW
16
0.4
SSW
16
0.4
SSW
16
0.4
SW
16
0.3
S
11
0.4
NW
11
0.4
NW
11
0.4
NW
11
0.4
NNW
11
0.3
SSW
16
0.3
SSW
17
0.3
SSW
17
0.4
SW
13
0.4
SSW
16
0.4
SW
15
0.4
SW
14
0.4
SW
14
0.4
SSE
11
0.4
SSE
10
0.4
SW
21
Energy kJ
9
67
102
99
99
99
99
66
21
33
31
31
40
52
54
57
42
89
54
54
54
37
37
117
Swell 3
Height (m)
Direction
Period (s)
0.3
SW
17
0.3
SE
6
0.3
SE
6
0.4
SE
6
0.4
SE
6
0.4
SE
8
0.3
S
11
0.3
SSE
11
0.3
SW
16
0.3
S
11
0.3
SE
6
0.3
S
12
0.3
SSW
16
0.3
NW
11
0.3
NW
11
0.3
SSE
12
0.3
SSE
7
0.3
SSE
6
0.4
SSE
6
0.3
SSE
6
0.3
S
5
0.4
SW
21
0.4
SW
21
0.3
S
6
Energy kJ
43
6
6
9
11
17
21
23
40
21
6
24
53
19
19
26
9
8
12
6
5
117
117
7
Wind waves
Height (m)
Direction
Period (s)
1.5
E
6
1.4
E
6
1.4
E
6
1.6
E
6
1.3
E
6
0.2
N
7
1.3
E
8
1.4
E
8
1
E
5
1.4
E
6
1.3
E
6
1.3
E
8
1.3
E
8
1.4
E
8
1.1
E
8
1.3
E
8
0.2
NNE
6
1.2
E
8
1.2
E
8
0.9
E
5
Energy kJ
170
148
148
181
128
4
217
260
54
129
119
224
223
252
156
224
4
199
199
37
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
Distance (km)
12
12
4
4
4
4
4
4
4
4
4
12
4
4
4
4
4
4
4
4
4
4
4
4
Best forecast wave conditions in Maui
Rating
(10 max)
2
2
2
2
2
1
1
2
1
1
1
1
1
1
3
1
3
3
1
1
1
2
2
2
Best forecast wave conditions in United States
Rating
(10 max)
4
3
3
2
2
2
2
2
2
2
2
1
3
2
3
5
3
9
2
2
1
5
8
5
Header Global
Rating
(10 max)
5
6
5
5
5
5
5
4
6
6
5
5
4
5
5
5
9
9
7
4
4
5
8
6
  • 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

FREE! Surf-Forecast.com widget for your website

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