Grandma's surf break

Grandma's surfForecast / HAW – Maui / USA

information circle48hr Weather and Surf, issued 7 am Saturday 18 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
24.9° C
(Which is slightly warmer than usual)

How big are the waves at Grandma's today?

The current surf forecast for Grandma's at 1PM is: 0.4m 12s primary swell from a West direction and 0.4m 12s secondary swell from a South direction (forecast issued at 07:00am April 18). An open ocean swell of 0.4m 6s is not directed at the surf break, a second open ocean swell of 1.3m 6s is not directed at the surf break. The wind direction is predicted to be cross-onshore.

Time (HST) & DateWave HeightWave Period
Morning (18 Apr)1.5ft (0.4m)13s
Afternoon (18 Apr)1.5ft (0.4m)12s
Evening (18 Apr)1.5ft (0.4m)12s

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


Updates in  hr  min  s Forecast update imminent
Saturday
18
Sunday
19
Monday
20
Tue
21
5AM8AM11AM2PM5PM8PM11PM2AM5AM8AM11AM2PM5PM8PM11PM2AM5AM8AM11AM2PM5PM8PM11PM2AM
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
0
0
1
1
1
1
1
1
1
1
1
1
1
1
Swell
Height Map
Wave Height (m) & direction (?)
0.4
WSW
0.4
WSW
0.4
S
0.4
S
0.4
S
0.4
S
0.4
S
0.4
W
0.4
W
0.3
W
0.3
S
0.3
S
0.4
W
0.4
SW
0.4
W
0.4
W
0.4
W
0.4
W
0.4
SW
0.4
SW
0.4
SW
0.4
SW
0.4
SW
0.4
SW
Period(s) (?)131312121212121212121111111613131414151414141414
Wave
Graph
(?)Metric surfscale
Energy kJ (?)555450464545434544232325416555565962625554545455
Wind
(km/h)
15
NE
15
NE
5
E
5
ESE
0
WSW
10
NNE
5
NNW
5
N
5
NNE
5
NNE
5
NW
5
NW
5
NNE
5
SW
0
W
0
ESE
5
ENE
5
NNE
5
SSW
5
NNW
5
NNW
0
N
5
WSW
5
NW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offoffglassglassglasscross-
off
glasscross-
off
offglasscrosscrosscross-
off
glassglassglassglassglassglassglassglassglassglassglass
High Tide
/ height (m)
4:23AM
0.34
5:18PM
0.76
5:08AM
0.29
6:09PM
0.77
6:01AM
0.24
7:05PM
0.75
Low Tide
/ height (m)
10:01AM
-0.09
11:59PM
0.06
10:40AM
-0.08
1:05AM
0.07
11:24AM
-0.05
Saturday
18
Sunday
19
Monday
20
Tue
21
Sunrise-6:05-------6:03-------6:03------
Sunset----6:45-------6:45-------6:45---
cloud
cloud
cloud
part cloud
cloud
part cloud
clear
clear
clear
clear
part cloud
part cloud
cloud
cloud
cloud
thunderstorm
part cloud
part cloud
part cloud
part cloud
thunderstorm
thunderstorm
part cloud
clear
Rain (mm)
---------------1----11--
Temp. °C232525252624232322232526252424242324252525242423
Feels °C (?)242627283026262524262728282728282627282928282826
  • 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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