Grandma's surf break

Grandma's surfForecast / HAW – Maui / USA

information circle16 Day Weather and Surf, issued 7 am Friday 01 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
25.2° C
(Which is slightly warmer than usual)

Best Forecast Surf Conditions for Grandma's this week:

The surf forecast for Grandma's over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (May 01) at 2PM. The primary swell is predicted to be 0.4m and 15s period. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Grandma's in the next 16 days are 0.6m 15s and forecast to arrive on Saturday (May 02) at 11AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Sunday (May 03) at 5PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 2PM (Fri 1st May)1.5ft (0.4m) 15s
Best Surf11AM (Sat 2nd May)2ft (0.6m) 15s
Most Powerful11AM (Sat 2nd May)2ft (0.6m) 15s

Table - best surf conditions forecast for Grandma's over the next 16 days.


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Mostly dry. Warm (max 26°C on Fri morning, min 22°C on Fri night). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Warm (max 26°C on Wed afternoon, min 23°C on Mon night). Wind will be generally light.

Friday
1
Saturday
2
Sunday
3
Monday
4
Tuesday
5
Wednesday
6
Thursday
7
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
1
2
1
1
1
1
1
1
1
1
1
1
0
0
1
1
1
1
1
Swell
Height Map
<span class="translation_missing" title="translation missing: en.components.forecast-table.maps.snow_map">Snow Map</span>
<span class="translation_missing" title="translation missing: en.components.forecast-table.maps.snow_map">Snow Map</span>
<span class="translation_missing" title="translation missing: en.components.forecast-table.maps.snow_map">Snow Map</span>
<span class="translation_missing" title="translation missing: en.components.forecast-table.maps.snow_map">Snow Map</span>
<span class="translation_missing" title="translation missing: en.components.forecast-table.maps.snow_map">Snow Map</span>
<span class="translation_missing" title="translation missing: en.components.forecast-table.maps.snow_map">Snow Map</span>
<span class="translation_missing" title="translation missing: en.components.forecast-table.maps.snow_map">Snow Map</span>
Wave
Height (m)
Direction
Period (s)
0.4
SSW
15
0.4
SSW
16
0.5
NW
16
0.6
NW
15
0.4
SSW
14
0.5
S
14
0.5
S
13
0.6
S
14
0.5
S
14
0.5
S
13
0.4
SSW
13
0.5
NW
12
0.5
NW
12
0.5
NW
11
0.3
SSW
12
0.2
SSW
18
0.4
SSW
16
0.4
SSW
16
0.3
SSW
18
0.4
SSW
14
0.4
SSW
15
Wave Graph
Metric surfscale
Energy kJ
73
85
133
183
70
93
87
150
106
90
60
72
68
63
27
31
84
100
66
70
72
Wind (km/h)
10
NE
15
NE
15
NNE
5
N
10
NNE
5
NNE
10
NNE
20
NE
15
NNE
0
W
5
NE
5
NNE
5
SSW
5
SSE
5
SW
5
W
10
NNE
10
NNE
5
WSW
5
NE
5
NE
off
off
off
glassy
off
off
off
off
off
glassy
off
glassy
glassy
glassy
glassy
cross-on
cross-off
off
glassy
off
off
High Tide
4:20PM0.70m
4:05AM0.30m
4:57PM0.70m
4:44AM0.27m
5:36PM0.70m
5:26AM0.24m
6:18PM0.69m
6:18AM0.21m
7:04PM0.67m
7:24AM0.20m
7:55PM0.65m
8:44AM0.21m
8:48PM0.62m
Low Tide
9:00AM-0.04m
10:55PM0.10m
9:31AM-0.04m
11:41PM0.10m
10:04AM-0.02m
00:30AM0.10m
10:40AM0.00m
1:23AM0.10m
11:21AM0.03m
2:21AM0.10m
12:07PM0.06m
3:20AM0.09m
1:02PM0.09m
4:11AM0.08m
part cloud
part cloud
clear
clear
part cloud
clear
part cloud
part cloud
clear
clear
part cloud
clear
clear
part cloud
clear
clear
part cloud
part cloud
clear
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:56
5:54
5:54
5:54
5:52
5:52
5:52
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:50
6:51
6:51
6:51
6:52
6:52
6:52
Temp °C
26
26
23
25
25
23
26
26
24
25
25
24
25
25
24
25
26
24
25
25
24
26
25
23
27
27
24
27
27
23
27
27
26
27
28
27
27
28
25
27
27
26
Swell 1
Height (m)
Direction
Period (s)
0.4
NNW
12
0.4
SSW
16
0.5
NW
16
0.6
NW
15
0.6
NNW
14
0.5
NW
13
0.5
S
13
0.6
S
14
0.5
S
14
0.5
S
13
0.4
SSW
13
0.5
NW
12
0.5
NW
12
0.5
NW
11
0.4
NNW
11
0.4
NW
11
0.4
SSW
16
0.4
SSW
16
0.3
SSW
14
0.4
SSW
14
0.4
NNW
10
Energy kJ
56
85
133
183
136
85
87
150
106
90
58
72
68
63
47
29
84
100
41
70
42
Swell 2
Height (m)
Direction
Period (s)
0.4
SSW
15
0.4
NNW
12
0.4
SSW
16
0.5
S
14
0.4
SSW
14
0.5
S
14
0.4
NW
12
0.4
NW
12
0.4
NW
11
0.3
NW
11
0.4
NW
13
0.4
SSW
13
0.3
SSW
12
0.3
SSW
12
0.3
SE
4
0.2
SSW
18
0.4
NW
10
0.4
NW
10
0.4
NW
10
0.3
SSW
18
0.4
SSW
15
Energy kJ
73
54
84
106
70
93
53
52
33
19
60
55
29
28
2
31
25
25
23
61
72
Swell 3
Height (m)
Direction
Period (s)
0.3
NNE
8
0.3
NNE
7
0.4
NW
11
0.3
SSW
18
0.3
SSW
18
0.4
SSW
16
0.4
SSW
16
0.4
SE
6
0.3
ESE
6
0.2
SSW
19
0.2
N
5
0.4
SE
6
0.3
SE
4
0.2
SSW
16
0.3
SSW
12
0.2
SSW
15
0.2
SSW
16
0.2
S
11
0.3
SSW
18
0.4
NW
16
0.4
NW
14
Energy kJ
12
10
31
61
61
86
85
8
7
37
2
8
3
26
27
22
25
9
66
62
47
Wind waves
Height (m)
Direction
Period (s)
1.5
E
6
1.4
E
6
1.1
E
8
0.9
E
5
1.2
E
8
1.4
E
8
1.3
E
8
1.6
E
6
1.3
E
5
0.8
E
5
1
E
8
1.1
E
5
0.9
ESE
8
0.2
SSE
3
0.2
N
9
0.3
NNE
3
0.2
N
8
0.5
N
3
0.5
E
4
Energy kJ
165
134
138
42
172
240
219
152
94
28
124
67
107
1
6
2
5
4
7
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
Distance (km)
12
12
4
4
4
4
4
13
4
4
12
4
14
12
12
15
4
4
4
4
12
Best forecast wave conditions in Maui
Rating
(10 max)
1
2
2
3
2
2
2
1
1
1
1
2
2
2
2
1
1
1
2
2
2
Best forecast wave conditions in United States
Rating
(10 max)
2
3
3
3
3
2
2
1
3
2
2
3
2
2
2
1
1
3
2
2
3
Header Global
Rating
(10 max)
5
5
4
4
4
4
4
4
5
4
5
5
5
6
7
5
5
9
5
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)
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Information about the Grandma's Surf forecast

The above surf forecast table for Grandma's provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Grandma's can be found by selecting the local surf guide option on the grey menu. Our Grandma's surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Grandma's) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).

Further information to help with frequently asked questions about our surf forecast for Grandma's may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.

Are you planning a vacation in Maui? If you are looking for accommodation near Grandma's, camping, hotels and condos and appartments in Maui, consider staying in Kihei which is 10 km (6 miles) away. Other places in and around Maui where you can find information about places to rent, and car hire include Wailuku which is 12 km (7 miles) away, Kahului, Lanai - Lanai and Kaunakakai - Molokai.

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