Grandma's surf break

Grandma's surfForecast / HAW – Maui / USA

information circle48hr Weather and Surf, issued 7 am Thursday 21 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
25.6° 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 3PM is: 0.5m 16s primary swell from a South direction (forecast issued at 07:00am May 21). An open ocean swell of 0.4m 7s is not directed at the surf break, a second open ocean swell of 2.3m 7s is not directed at the surf break. The wind direction is predicted to be offshore.

Time (HST) & DateWave HeightWave Period
Morning (21 May)1.5ft (0.5m)16s
Afternoon (21 May)1.5ft (0.5m)16s
Evening (21 May)1.5ft (0.5m)15s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Mostly dry. Warm (max 27°C on Thu afternoon, min 22°C on Thu night). Mainly fresh winds.

Thursday
21
Friday
22
Saturday
23
Sun
24
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
2 AM
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
1
1
0
0
1
1
1
1
1
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)
0.5
SSW
16
0.5
SSW
16
0.4
SSW
16
0.5
S
16
0.4
SSW
15
0.5
S
15
0.5
S
15
0.5
S
15
0.5
S
15
0.5
S
15
0.4
SSW
14
0.4
SSW
14
0.4
SSW
18
0.4
SSW
18
0.4
SSW
16
0.5
S
16
0.5
S
16
0.5
S
16
0.5
S
16
0.6
S
15
0.6
S
15
0.6
S
15
0.5
S
15
0.6
S
14
Wave Graph
Metric surfscale
Energy kJ
147
146
86
131
79
112
110
110
110
109
69
65
103
102
91
134
132
132
129
165
159
157
109
153
Wind (km/h)
20
NE
20
NE
15
NE
10
NE
25
NE
25
NNE
25
NE
20
NE
20
NE
25
NE
25
NE
25
NE
30
NE
30
NNE
20
NE
20
NNE
25
NE
25
NE
25
NE
30
NE
25
NNE
20
NE
25
NE
20
NNE
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
High Tide
8:33AM0.23m
8:36PM0.69m
9:51AM0.28m
9:31PM0.62m
10:59AM0.35m
10:25PM0.55m
Low Tide
3:05AM0.03m
12:58PM0.07m
3:55AM0.02m
2:11PM0.13m
4:37AM0.01m
3:36PM0.18m
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:46
5:46
5:46
5:46
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:58
6:59
6:59
7:00
Temp °C
23
24
26
27
25
23
23
22
22
24
26
26
25
23
23
22
22
24
26
25
25
23
23
22
21
22
25
27
23
21
20
20
20
21
23
22
22
20
21
21
20
21
23
21
22
21
21
20
Swell 1
Height (m)
Direction
Period (s)
0.5
SSW
16
0.5
SSW
16
0.4
ESE
7
0.5
S
16
0.5
SE
7
0.5
S
15
0.5
S
15
0.5
S
15
0.5
S
15
0.5
S
15
0.4
SSW
14
0.4
SSW
14
0.4
SSW
14
0.4
SSW
13
0.4
SSW
16
0.5
S
16
0.5
S
16
0.5
S
16
0.5
S
16
0.6
S
15
0.6
S
15
0.6
S
15
0.5
S
15
0.6
S
14
Energy kJ
147
146
18
131
23
112
110
110
110
109
69
65
62
60
91
134
132
132
129
165
159
157
109
153
Swell 2
Height (m)
Direction
Period (s)
0.4
SE
6
0.4
SE
7
0.4
SSW
16
0.4
ESE
7
0.4
SSW
15
0.4
SE
6
0.4
NNE
6
0.4
NNE
6
0.4
NNE
7
0.3
NNE
7
0.3
S
18
0.4
NNE
6
0.4
SSW
18
0.4
SSW
18
0.4
SSW
13
0.4
SE
5
0.4
NNE
7
0.4
NNE
8
0.3
SSW
13
0.3
SE
6
0.3
SE
6
0.5
N
9
0.5
NNE
9
0.4
NNE
8
Energy kJ
10
13
86
18
79
11
12
13
21
10
56
12
103
102
60
7
18
19
33
5
6
39
44
24
Swell 3
Height (m)
Direction
Period (s)
0.3
SSW
13
0.3
NNE
6
0.3
NNE
6
0.3
NNE
6
0.3
NNE
6
0.3
NNE
6
0.4
SE
6
0.4
SE
6
0.4
SE
5
0.4
SE
6
0.3
SE
6
0.3
SSW
18
0.4
SE
6
0.3
NNE
6
0.2
NNW
11
0.2
SSW
12
0.3
SSW
13
0.3
SSW
13
0.3
SE
5
0.2
NNW
16
0.2
NNW
16
0.4
NW
15
0.4
NW
14
0.4
NW
14
Energy kJ
34
7
8
7
6
6
9
9
7
9
6
61
10
8
11
14
34
34
4
25
25
56
54
51
Wind waves
Height (m)
Direction
Period (s)
1.8
E
7
2
E
7
2.2
E
7
2.3
E
7
2.2
E
7
0.3
ENE
2
0.2
ENE
2
1.8
E
6
1.7
E
6
0.2
ENE
2
0.4
NNE
7
1.3
E
6
0.4
NNE
6
0.4
NE
3
0.7
ENE
7
0.4
NNE
7
0.4
NE
3
0.3
ENE
3
0.4
NNE
7
0.4
NNE
6
0.5
NNE
7
0.2
ENE
3
1.6
E
6
1.5
E
6
Energy kJ
303
395
465
509
466
1
1
260
204
1
15
123
13
2
38
21
2
1
16
15
29
1
188
164
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)
12
12
13
4
14
134
123
12
12
12
13
12
136
123
12
12
12
12
13
345
12
12
12
12
Best forecast wave conditions in Maui
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Best forecast wave conditions in United States
Rating
(10 max)
3
1
2
1
2
2
3
3
2
2
3
3
2
2
2
2
2
2
3
2
2
2
3
2
Header Global
Rating
(10 max)
5
5
5
4
5
7
7
7
6
6
6
5
6
7
8
8
7
6
5
5
5
5
6
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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