Grandma's surf break

Grandma's surfForecast / HAW – Maui / USA

information circle48hr Weather and Surf, issued 1 am Monday 13 Apr 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
24.4° 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 8AM is: 0.6m 11s primary swell from a Northwest direction and 0.4m 12s secondary swell from a Southwest direction (forecast issued at 01:00am April 13). An open ocean swell of 0.7m 5s is not directed at the surf break. The wind direction is predicted to be glassy.

Time (HST) & DateWave HeightWave Period
Morning (13 Apr)2ft (0.6m)11s
Afternoon (13 Apr)2ft (0.6m)10s
Evening (13 Apr)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
Monday
13
Tuesday
14
Wednesday
15
11PM2AM5AM8AM11AM2PM5PM8PM11PM2AM5AM8AM11AM2PM5PM8PM11PM2AM5AM8AM11AM2PM5PM8PM
Rating
(10 max)
0
1
1
1
0
0
1
1
1
1
1
1
0
1
1
1
1
1
1
1
1
1
1
1
Swell
Height Map
Wave Height (m) & direction (?)
0.6
NW
0.6
NW
0.6
NW
0.6
NW
0.6
NW
0.6
NW
0.4
S
0.5
S
0.5
S
0.4
S
0.6
S
0.6
S
0.6
S
0.6
S
0.7
S
0.7
S
0.7
S
0.7
S
0.6
S
0.6
S
0.6
S
0.7
S
0.7
S
0.4
S
Period(s) (?)111111111111141414131413131313131312121212121215
Wave
Graph
(?)Metric surfscale
Energy kJ (?)97969696737262991015312912712512316215515314810710310314114172
Wind
(km/h)
20
NNE
15
NNE
5
NNE
5
NW
5
WSW
5
S
0
SSE
5
S
5
WNW
5
SW
5
W
5
S
5
S
5
WSW
0
SE
5
SSE
0
E
5
NE
0
N
5
ENE
0
SW
5
SSW
5
NNE
5
NNW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
offoffglassoncross-
on
glassglassglassglassglassglasscross-
on
glassglassglassglassglassglassglassglassglassglassglass
High Tide
/ height (m)
1:08AM
0.59
1:51PM
0.45
1:48AM
0.56
2:30PM
0.53
2:26AM
0.52
3:09PM
0.61
Low Tide
/ height (m)
7:31AM
0.01
7:19PM
0.07
7:57AM
-0.02
8:14PM
0.05
8:25AM
-0.05
Monday
13
Tuesday
14
Wednesday
15
Sunrise---6:09-------6:07-------6:07----
Sunset------6:44-------6:44-------6:45-
light rain
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
cloud
cloud
cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
rain showers
part cloud
cloud
part cloud
part cloud
part cloud
thunderstorm
cloud
Rain (mm)
1---------------1-----1-
Temp. °C222222232525252525242424252525252424242425252424
Feels °C (?)222324252727282829272727282928292827282729292727
  • 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

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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