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Surf Forecasts:

Grandma's surf break

Grandma's surfForecast / HAW – Maui / USA

information circle48hr Weather and Surf, issued 1 am Tuesday 17 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 4AM is: 0.8m 10s primary swell from a West direction and 0.5m 5s secondary swell from a South direction (forecast issued at 01:00am March 17). The wind direction is predicted to be offshore.

Time (HST) & DateWave HeightWave Period
Morning (17 Mar)1.5ft (0.5m)11s
Afternoon (17 Mar)1.5ft (0.5m)17s
Evening (17 Mar)2ft (0.6m)16s

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

Updates in  hr  min  s Forecast update imminent 
16 DaysHourly
Print Table
Tuesday
17
Wednesday
18
Thursday
19
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
1
1
1
1
1
1
1
1
1
2
1
2
2
2
2
2
2
2
1
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.9
W
0.8
W
0.7
W
0.7
W
0.5
NW
0.5
S
0.5
S
0.6
S
0.6
S
0.6
S
0.7
S
0.7
S
0.8
S
0.8
S
0.8
S
0.8
S
0.8
S
0.8
S
0.8
S
0.8
S
0.8
S
0.7
S
0.7
S
0.7
S
Period(s) (?)10101091117171616161616161615151514141414141413
Wave
Graph
(?)Metric surfscale
Energy kJ (?)154120908558151147198190186251248322314290279272268268264261198184176
Wind
(km/h)
5
SSE
0
NW
10
NNE
20
NNE
20
NNE
15
NE
15
NNE
15
NNE
15
NNE
10
NNE
10
NNE
10
NE
0
NW
5
SSW
5
SSE
5
NE
5
ENE
5
ENE
5
ENE
5
SE
10
S
15
S
15
SSE
15
S
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crossglassoffoffoffoffoffoffoffoffoffoffglassglassglassglassglassglassglasscrosscross-
on		cross-
on		cross-
on		cross-
on
High Tide
/ height (m)
3:05AM
0.64
3:31PM
0.48
3:38AM
0.60
4:10PM
0.54
4:12AM
0.54
4:51PM
0.59
Low Tide
/ height (m)
8:20PM
0.01
9:21AM
-0.00
9:08PM
0.01
9:46AM
-0.02
9:57PM
0.02
10:13AM
-0.05
Tuesday
17
Wednesday
18
Thursday
19
Sunrise---6:33-------6:31-------6:31----
Sunset------6:36-------6:36-------6:36-
light rain
light rain
rain showers
part cloud
part cloud
part cloud
cloud
cloud
part cloud
part cloud
part cloud
cloud
part cloud
thunderstorm
cloud
part cloud
part cloud
clear
clear
clear
clear
thunderstorm
thunderstorm
thunderstorm
Rain (mm)
211----------1-------123
Temp. °C242424232323232222222223242525242424242425252424
Feels °C (?)272726232324242323242425272828272727272626262525
  • 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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