Grandma's surf break

Grandma's surfForecast / HAW – Maui / USA

information circle48hr Weather and Surf, issued 1 am Monday 18 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 9AM is: 0.6m 14s primary swell from a South-southwest direction (forecast issued at 01:00am May 18). An open ocean swell of 0.3m 8s is not directed at the surf break, a second open ocean swell of 1.7m 8s is not directed at the surf break. The wind direction is predicted to be glassy.

Time (HST) & DateWave HeightWave Period
Morning (18 May)2ft (0.6m)14s
Afternoon (18 May)1.5ft (0.4m)19s
Evening (18 May)1.5ft (0.5m)14s

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 3mm), mostly falling on Mon afternoon. Warm (max 27°C on Mon morning, min 23°C on Tue night). Wind will be generally light.

Monday
18
Tuesday
19
Wednesday
20
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
2
2
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
Swell
Height Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
0.6
SSW
14
0.5
SSW
14
0.6
SSW
14
0.7
SSW
14
0.7
SSW
14
0.4
SW
19
0.5
SSW
14
0.5
SSW
14
0.5
SSW
14
0.7
SSW
14
0.4
SSW
18
0.4
SSW
18
0.5
SSW
15
0.7
SSW
17
0.6
SSW
15
0.6
SSW
15
0.6
SSW
14
0.6
SSW
14
0.6
SSW
14
0.5
SSW
14
0.5
SSW
14
0.5
SSW
14
0.5
SSW
14
0.4
SSW
17
Wave Graph
Metric surfscale
Energy kJ
140
118
136
183
186
108
105
104
105
170
121
121
121
264
169
174
158
158
160
116
111
105
104
92
Wind (km/h)
5
NNE
10
N
5
N
5
NNW
5
NNE
10
NNE
10
NNE
10
NNE
10
N
5
NE
5
N
5
WNW
5
E
10
NE
15
NE
15
NNE
10
NNE
15
NNE
15
NE
10
NE
15
NE
15
NE
20
NNE
20
NNE
off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
off
cross-off
glassy
cross-off
off
off
off
off
off
off
off
off
off
off
off
High Tide
5:03AM0.22m
5:54PM0.84m
6:05AM0.21m
6:47PM0.80m
7:16AM0.21m
7:41PM0.75m
Low Tide
00:10AM0.04m
10:15AM-0.09m
1:09AM0.04m
11:03AM-0.05m
2:09AM0.03m
11:56AM0.00m
clear
clear
clear
part cloud
thunderstorm
part cloud
clear
clear
clear
clear
clear
part cloud
thunderstorm
thunderstorm
clear
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:47
5:47
5:47
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:57
6:58
6:58
1
1
1
Temp °C
24
24
25
27
26
26
25
24
24
24
25
26
26
26
24
24
24
23
24
26
27
26
24
24
27
27
28
30
28
28
27
26
26
27
27
29
28
28
25
25
25
24
24
27
28
26
24
24
Swell 1
Height (m)
Direction
Period (s)
0.6
SSW
14
0.5
SSW
14
0.6
SSW
14
0.7
SSW
14
0.7
SSW
14
0.5
SSW
14
0.5
SSW
14
0.5
SSW
14
0.5
SSW
14
0.7
SSW
14
0.5
SSW
14
0.5
SSW
14
0.5
SSW
15
0.7
SSW
17
0.6
SSW
15
0.6
SSW
15
0.6
SSW
14
0.6
SSW
14
0.6
SSW
14
0.5
SSW
14
0.5
SSW
14
0.5
SSW
14
0.5
SSW
14
0.4
SSW
13
Energy kJ
140
118
136
183
186
108
105
104
105
170
113
115
121
264
169
174
158
158
160
116
111
105
104
57
Swell 2
Height (m)
Direction
Period (s)
0.3
SSE
6
0.3
S
6
0.3
ESE
8
0.4
SW
19
0.5
SW
19
0.4
SW
19
0.4
SE
6
0.4
SE
6
0.3
SSW
16
0.3
SW
18
0.4
SSW
18
0.4
SSW
18
0.4
SW
18
0.2
NNW
11
0.3
ESE
6
0.4
SE
6
0.4
SE
6
0.4
SE
5
0.3
NNW
10
0.4
SE
6
0.4
SE
6
0.4
SE
6
0.4
SE
6
0.4
SSW
17
Energy kJ
8
7
13
96
184
96
11
9
52
49
121
121
80
13
7
10
9
7
20
9
9
9
10
92
Swell 3
Height (m)
Direction
Period (s)
0.3
ESE
6
0.2
ESE
6
0.2
S
6
0.3
ESE
8
0.3
ESE
6
0.4
SE
6
0.3
SSW
16
0.3
SSW
16
0.3
SE
5
0.2
SSE
10
0.3
E
6
0.3
NNW
11
0.2
NNW
11
0.2
SSE
10
0.3
NNE
6
0.2
NNW
11
0.2
NNW
11
0.3
NNW
11
0.2
NNE
5
0.2
NNE
6
0.3
NNE
5
0.3
NNE
6
0.3
SSW
18
0.2
NNW
11
Energy kJ
8
4
3
13
7
9
51
51
4
9
6
24
12
10
7
11
11
22
3
3
6
6
60
11
Wind waves
Height (m)
Direction
Period (s)
1.8
E
8
1.7
E
8
1.7
E
8
1.6
E
8
1.8
E
6
1.9
E
6
2
E
6
1.6
E
6
1.5
E
8
1
E
5
1.5
E
6
1.5
E
8
1.3
E
8
1.7
E
5
1.8
E
6
1.5
E
6
1.5
E
6
1.3
E
8
1.3
E
8
1.7
E
6
1.7
E
6
2.1
E
6
1.9
E
6
0.6
E
7
Energy kJ
428
381
381
338
206
263
292
157
304
57
133
297
223
159
222
173
149
235
230
226
233
355
291
31
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
2
2
1
1
2
1
2
2
1
2
2
1
1
2
1
1
1
1
1
1
1
Distance (km)
4
4
4
4
4
4
4
4
4
4
4
4
12
4
12
4
4
4
12
4
4
13
12
12
Best forecast wave conditions in Maui
Rating
(10 max)
1
1
1
2
2
1
1
2
1
2
2
1
2
2
1
1
2
1
1
1
1
1
1
1
Best forecast wave conditions in United States
Rating
(10 max)
4
4
4
4
4
4
4
3
3
4
3
3
3
4
4
4
4
3
2
1
1
1
3
3
Header Global
Rating
(10 max)
4
4
5
4
4
4
4
4
4
4
4
4
4
5
5
4
4
4
5
5
5
4
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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