Grandma's surf break

Grandma's surfForecast / HAW – Maui / USA

information circle48hr Weather and Surf, issued 1 pm 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 8PM is: 0.5m 14s primary swell from a South-southwest direction and 0.3m 16s secondary swell from a South-southwest direction (forecast issued at 01:00pm May 18). An open ocean swell of 1.8m 6s is not directed at the surf break. The wind direction is predicted to be cross-offshore.

Time (HST) & DateWave HeightWave Period
Morning (18 May)2.5ft (0.7m)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 5mm), mostly falling on Tue afternoon. Warm (max 27°C on Mon afternoon, min 23°C on Tue 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)
2
2
1
1
1
1
1
1
1
1
1
1
1
1
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
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
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
0.6
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
0.5
SSW
16
0.5
SSW
16
0.5
SSW
16
Wave Graph
Metric surfscale
Energy kJ
183
186
108
105
104
105
173
121
121
167
264
169
174
158
158
160
116
111
105
104
93
147
147
146
Wind (km/h)
5
N
10
NNE
10
NNE
10
NNE
10
NNE
5
N
10
NNE
5
N
0
WSW
5
SW
10
N
15
NE
15
NNE
10
NNE
15
NE
20
NE
10
NE
15
NE
20
NE
20
NNE
20
NE
15
NNE
20
NE
25
NE
cross-off
off
off
cross-off
off
cross-off
cross-off
glassy
glassy
glassy
cross-off
off
off
cross-off
off
off
off
off
off
off
off
off
off
off
High Tide
5:54PM0.84m
6:05AM0.21m
6:47PM0.80m
7:16AM0.21m
7:41PM0.75m
Low Tide
10:15AM-0.09m
1:09AM0.04m
11:03AM-0.05m
2:09AM0.03m
11:56AM0.00m
3:05AM0.03m
part cloud
thunderstorm
part cloud
clear
clear
clear
clear
clear
part cloud
thunderstorm
thunderstorm
rain showers
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:47
5:47
5:46
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:57
6:58
6:58
6:58
1
1
2
1
Temp °C
26
27
26
24
24
24
24
24
26
26
26
25
24
23
23
24
26
26
26
24
23
23
23
24
29
29
28
25
26
27
26
27
29
29
28
27
25
24
24
24
27
26
26
23
23
23
22
22
Swell 1
Height (m)
Direction
Period (s)
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
0.6
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
ESE
7
0.5
SSW
16
0.5
SSW
16
0.5
SSW
16
Energy kJ
183
186
108
105
104
105
173
113
115
167
264
169
174
158
158
160
116
111
105
104
17
147
147
146
Swell 2
Height (m)
Direction
Period (s)
0.4
SW
19
0.5
SW
19
0.4
SW
19
0.3
SSW
16
0.4
SE
5
0.3
SSW
16
0.3
SW
18
0.4
SSW
18
0.4
SSW
18
0.2
NNW
11
0.2
NNW
11
0.4
SE
6
0.4
SE
6
0.4
SE
5
0.3
NNW
11
0.3
NNW
10
0.4
SE
6
0.5
SE
6
0.4
SE
6
0.4
SE
6
0.4
SSW
13
0.4
SE
6
0.4
ESE
6
0.4
SE
6
Energy kJ
96
184
96
51
7
52
49
121
121
12
13
10
10
7
22
20
10
19
9
10
57
9
14
10
Swell 3
Height (m)
Direction
Period (s)
0.2
ESE
8
0.3
ESE
6
0.3
SSW
16
0.3
SSW
19
0.3
SSW
16
0.2
ESE
5
0.2
ESE
6
0.3
NNW
11
0.2
NNW
11
0.3
SW
18
0.2
S
4
0.3
NNE
3
0.2
NNW
11
0.2
NNW
11
0.4
SE
8
0.3
SE
6
0.3
NNW
10
0.3
NNE
5
0.2
NNW
10
0.3
NNE
6
0.4
SSW
17
0.3
SSW
13
0.3
SSW
13
0.3
SSW
13
Energy kJ
7
7
51
74
51
3
3
24
12
49
2
2
11
11
18
5
20
5
11
6
93
34
34
33
Wind waves
Height (m)
Direction
Period (s)
1.3
E
8
1.6
E
8
1.6
E
8
1.8
E
6
1.5
E
8
1.4
E
8
1.4
E
8
1.5
E
5
1.4
E
8
1.5
E
8
0.6
NE
6
1.9
E
6
1.5
E
6
1.5
E
6
1.1
E
5
1.5
E
6
1.8
E
6
2
E
6
0.2
N
5
1.7
E
6
0.3
ENE
2
0.3
NNE
5
0.3
NNE
5
Energy kJ
230
329
329
214
297
265
265
124
258
297
20
273
173
149
70
154
272
324
2
219
1
5
5
Nearest Offshore or Glassy
Rating
(10 max)
2
2
1
2
1
1
1
2
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
Distance (km)
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
12
4
13
13
12
12
12
12
14
Best forecast wave conditions in Maui
Rating
(10 max)
2
2
1
2
1
1
1
2
1
1
2
1
1
2
1
1
1
1
1
1
1
1
1
1
Best forecast wave conditions in United States
Rating
(10 max)
4
3
4
4
4
3
4
3
3
1
4
4
4
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

FREE! Surf-Forecast.com widget for your website

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