Grandma's Surf Break

Lat Long: 20.79° N 156.56° W

Grandma's 48 hour detailed Surf Forecast

Issued: 1 am 12 Sep 2026 (local time)

Forecast update in  hr  min

Today's Grandma's sea temperature is
27.0°C
0.2° 

Grandma's surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


How big are the waves at Grandma's today (12 Sep):

  • Morning surf: Morning surf (12 Sep, local time) - 2ft (0.6m), 15s period with SSW swell.
  • Afternoon surf: Afternoon surf (12 Sep, local time) - 1.5ft (0.4m), 16s period with SW swell.
  • Evening surf: Evening surf (12 Sep, local time) - 1.5ft (0.4m), 16s period with SW swell.

The current surf forecast for Grandma's at 10AM is: 0.6m 15s primary swell from a South-southwest direction and 0.3m 11s secondary swell from a South-southwest direction (forecast issued at 01:00am September 12). An open ocean swell of 0.4m 4s is not directed at the surf break. The wind direction is predicted to be glassy.

Time (HST) & DateWave HeightWave Period
Morning (12 Sep)2ft (0.6m)15s
Afternoon (12 Sep)1.5ft (0.4m)16s
Evening (12 Sep)1.5ft (0.4m)16s

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


Short Range Forecast

Mostly dry. Warm (max 27°C on Sat morning, min 24°C on Sun night). Wind will be generally light.

Saturday
12
Sunday
13
Monday
14
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
1
1
1
1
1
1
1
1
1
1
1
0
0
1
1
1
0
1
1
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.6
SSW
15
0.6
SSW
15
0.6
SSW
15
0.6
SSW
15
0.4
SW
16
0.4
SW
16
0.4
SW
16
0.4
SW
16
0.4
SW
16
0.4
SSW
14
0.6
SSW
15
0.4
SW
15
0.4
SW
15
0.4
SW
15
0.4
SW
14
0.3
SW
14
0.4
SW
14
0.4
SSW
14
0.4
SW
14
0.4
SW
14
0.4
SW
22
0.4
SW
22
0.4
SW
22
0.4
SW
21
Wave Graph
Metric surfscale
Energy kJ
148
148
148
158
66
73
64
64
64
75
148
60
55
54
54
33
54
78
50
50
124
118
118
117
Wind (km/h)
5
NNE
10
NE
5
NE
5
NNW
5
ESE
10
NE
15
NNE
10
NNE
10
NNE
5
NNE
10
NNE
5
N
5
ENE
5
NNE
15
NNE
15
NNE
15
NNE
10
NNE
10
NNE
5
NNW
5
NNE
10
NNE
15
NNE
15
NNE
Wind State
off
off
off
glassy
glassy
off
off
off
off
cross-off
cross-off
glassy
glassy
off
cross-off
off
off
off
off
glassy
glassy
off
cross-off
cross-off
High Tide
4:49AM0.61m
4:47PM0.58m
5:30AM0.64m
5:19PM0.50m
6:15AM0.66m
5:52PM0.44m
Low Tide
10:34AM0.12m
10:45PM0.05m
11:25AM0.16m
11:13PM0.06m
12:19PM0.20m
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:11
6:11
6:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:31
6:30
6:30
 mm
Temp °C
25
25
25
27
27
27
25
25
25
25
25
27
27
27
25
25
24
24
25
27
27
27
26
25
Feels °C
27
27
27
29
29
29
26
26
27
28
27
30
30
29
25
26
25
25
26
30
29
28
26
26
  • 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
How to use the Wavefinder 

FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Grandma's surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.


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