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Surf Forecasts:

Grandma's surf break

Grandma's surfForecast / HAW – Maui / USA

information circle48hr Weather and Surf, issued 1 pm Wednesday 11 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
24.5° 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 4PM is: 1.1m 6s primary swell from a South direction and 0.4m 12s secondary swell from a South-southwest direction, 0.4m 12s secondary swell from a West-northwest direction (forecast issued at 01:00pm March 11). The wind direction is predicted to be cross-onshore.

Time (HST) & DateWave HeightWave Period
Morning (11 Mar)1.5ft (0.5m)13s
Afternoon (11 Mar)4ft (1.2m)6s
Evening (11 Mar)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 
16 DaysHourly
Print Table
Wednesday
11
Thursday
12
Friday
13
Saturday
14
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
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.3
S
1.2
S
1.1
S
0.4
WNW
0.4
SSW
0.5
W
0.6
W
0.6
W
0.6
W
0.6
W
0.6
W
0.4
SW
0.7
W
0.7
W
0.6
W
0.5
W
1.5
S
1.9
S
1.8
S
1.9
S
2.2
S
2.4
S
3
S
2.5
S
Period(s) (?)6661212111111111010181010101057767777
Wave
Graph
(?)Metric surfscale
Energy kJ (?)1361027548486388858280788598967150129318286291421526806787
Wind
(km/h)
25
S
20
SSW
20
S
15
S
15
S
15
S
15
SSE
15
SSE
15
SSW
25
S
15
SE
10
SSE
10
S
15
SSE
10
S
10
SSW
35
S
35
S
35
S
45
S
40
S
45
S
50
S
45
S
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		oncross-
on		crosscross-
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
High Tide
/ height (m)
10:35AM
0.22
11:37PM
0.61
11:53AM
0.24
12:30AM
0.64
12:49PM
0.27
1:15AM
0.66
Low Tide
/ height (m)
3:29PM
0.07
7:14AM
0.14
4:39PM
0.07
7:45AM
0.10
5:44PM
0.05
Wednesday
11
Thursday
12
Friday
13
Saturday
14
Sunrise-------6:37-------6:35-------6:35
Sunset--6:34-------6:34-------6:35-----
cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
clear
clear
clear
thunderstorm
thunderstorm
light rain
cloud
cloud
part cloud
cloud
thunderstorm
mod rain
mod rain
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
Rain (mm)
-1221---114----179111411252219
Temp. °C252424242424242424232123242524242423232323222223
Feels °C (?)242324252525252524222124252424252120211920181619
  • 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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View detailed surf forecast for Grandma's at:
surf-forecast.com

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