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Surf Forecasts:

Grandma's surf break

Grandma's surfForecast / HAW – Maui / USA

information circle48hr Weather and Surf, issued 1 pm Sunday 15 Mar 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 9PM is: 1.5m 10s primary swell from a West direction and 0.4m 15s secondary swell from a Southwest direction, 0.7m 6s secondary swell from a South direction (forecast issued at 01:00pm March 15). The wind direction is predicted to be cross-onshore.

Time (HST) & DateWave HeightWave Period
Morning (15 Mar)4ft (1.2m)10s
Afternoon (15 Mar)4.5ft (1.4m)10s
Evening (15 Mar)5ft (1.5m)10s

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

Updates in  hr  min  s Forecast update imminent 
16 DaysHourly
Print Table
Sunday
15
Monday
16
Tuesday
17
Wednesday
18
11 AM2 PM5 PM8 PM11 PM2 AM5 AM8 AM11 AM2 PM5 PM8 PM11 PM2 AM5 AM8 AM11 AM2 PM5 PM8 PM11 PM2 AM5 AM8 AM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
0
2
1
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.2
W
1.4
W
1.4
W
1.4
W
1.5
W
1.4
W
1.3
W
1.2
W
1.2
W
1.1
W
1
W
1
W
0.9
W
0.8
W
0.7
W
0.7
W
0.4
SSW
0.5
S
0.5
S
0.6
S
0.6
S
0.6
S
0.7
S
0.7
S
Period(s) (?)1010101010101111101010101010991717171616161616
Wave
Graph
(?)Metric surfscale
Energy kJ (?)2903943924004764243753193022441981941541208783101151147198190186251248
Wind
(km/h)
30
S
30
S
25
S
20
S
15
S
15
S
15
S
15
S
15
S
15
SSW
15
S
10
SSE
15
S
5
S
10
NE
10
NNE
10
NNE
5
ENE
5
NW
5
NE
5
N
5
SE
0
E
5
NE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		offoffoffglassglassglassglasscrossglassoff
High Tide
/ height (m)
2:15PM
0.36
2:31AM
0.67
2:53PM
0.42
3:05AM
0.64
3:31PM
0.48
3:38AM
0.60
Low Tide
/ height (m)
8:34AM
0.05
7:31PM
0.02
8:57AM
0.02
8:20PM
0.01
9:21AM
-0.00
9:08PM
0.01
Sunday
15
Monday
16
Tuesday
17
Wednesday
18
Sunrise-------6:33-------6:33-------6:31
Sunset--6:35-------6:36-------6:36-----
thunderstorm
thunderstorm
thunderstorm
thunderstorm
cloud
cloud
cloud
part cloud
rain showers
cloud
rain showers
rain showers
rain showers
light rain
part cloud
part cloud
light rain
part cloud
cloud
cloud
cloud
light rain
cloud
part cloud
Rain (mm)
1111----1-1111--1----1--
Temp. °C252525242424232424252424242423232324242323232323
Feels °C (?)242425242525242525262526252725252527272626262625
  • 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

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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.

View detailed surf forecast for Grandma's at:
surf-forecast.com

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