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Surf Forecasts:

Grandma's surf break

Grandma's surfForecast / HAW – Maui / USA

information circle48hr Weather and Surf, issued 1 am Friday 13 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 6AM is: 0.6m 10s primary swell from a West direction and 0.3m 11s secondary swell from a South-southwest direction, 1.0m 5s secondary swell from a South direction (forecast issued at 01:00am March 13). The wind direction is predicted to be cross-onshore.

Time (HST) & DateWave HeightWave Period
Morning (13 Mar)3.5ft (1.1m)5s
Afternoon (13 Mar)5ft (1.6m)5s
Evening (13 Mar)5ft (1.5m)6s

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

Updates in  hr  min  s Forecast update imminent 
16 DaysHourly
Print Table
Friday
13
Saturday
14
Sunday
15
11 PM2 AM5 AM8 AM11 AM2 PM5 PM8 PM11 PM2 AM5 AM8 AM11 AM2 PM5 PM8 PM11 PM2 AM5 AM8 AM11 AM2 PM5 PM8 PM
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 (?)
0.6
W
0.6
W
0.6
W
0.5
W
1.3
S
1.5
S
1.7
S
1.4
SSW
1.5
SSW
2
SSW
2.5
SSW
3
SSW
3
SSW
2.5
SSW
2.5
SSW
2.1
SSW
2.3
SW
2.2
SSW
2.3
SSW
2.2
SSW
2.2
SSW
2
SSW
1.2
W
1.4
W
Period(s) (?)101010105566667788878777771010
Wave
Graph
(?)Metric surfscale
Energy kJ (?)7473735081124184126131253553785874843800408665436491458444352273402
Wind
(km/h)
15
SW
20
S
25
S
25
SSE
30
SSE
35
S
35
S
40
SSE
45
S
50
S
45
SSW
45
SSW
45
S
40
SSW
45
SSW
40
S
40
S
40
S
45
S
40
SSW
40
SSW
35
SSW
35
SSW
30
SSW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
oncross-
on		cross-
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		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on
High Tide
/ height (m)
12:30AM
0.64
12:49PM
0.27
1:15AM
0.66
1:35PM
0.31
1:55AM
0.68
2:15PM
0.36
Low Tide
/ height (m)
7:45AM
0.10
5:44PM
0.05
8:11AM
0.08
6:40PM
0.03
8:34AM
0.05
7:31PM
0.02
Friday
13
Saturday
14
Sunday
15
Sunrise---6:35-------6:35-------6:33----
Sunset------6:35-------6:35-------6:35-
light rain
light rain
mod rain
mod rain
light rain
thunderstorm
thunderstorm
mod rain
mod rain
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
mod rain
thunderstorm
thunderstorm
mod rain
mod rain
thunderstorm
mod rain
thunderstorm
thunderstorm
thunderstorm
Rain (mm)
1481052014992136214211045761110432
Temp. °C212121222222222222232223242324242424232323232324
Feels °C (?)212120212019191817181719202020212121181920202123
  • 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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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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