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Surf Forecasts:

Grandma's surf break

Grandma's surfForecast / HAW – Maui / USA

information circle48hr Weather and Surf, issued 7 am Sunday 18 Jan 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
25.3° 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: 0.9m 18s primary swell from a Northwest direction (forecast issued at 07:00am January 18). An open ocean swell of 0.6m 11s is not directed at the surf break, a second open ocean swell of 1.4m 6s is not directed at the surf break. The wind direction is predicted to be glassy and the swell rating is 2.

Time (HST) & DateWave HeightWave Period
Morning (18 Jan)1ft (0.3m)20s
Afternoon (18 Jan)3.5ft (1.1m)17s
Evening (18 Jan)3.5ft (1.1m)16s

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

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table
Sunday
18
Monday
19
Tuesday
20
Wed
21
5 AM8 AM11 AM2 PM5 PM8 PM11 PM2 AM5 AM8 AM11 AM2 PM5 PM8 PM11 PM2 AM5 AM8 AM11 AM2 PM5 PM8 PM11 PM2 AM
Rating
(10 max)
1
1
2
1
2
3
2
2
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.4
NW
0.3
NW
0.8
NW
1
NW
1.1
NW
1.1
NW
1.1
NW
1.1
NW
0.9
NW
0.9
NW
0.8
NW
0.7
NW
0.6
NW
0.6
NW
0.6
NW
0.5
NW
0.4
NW
0.3
NW
0.4
NW
0.4
NW
0.6
NW
0.6
NW
0.6
NW
0.6
NW
Period(s) (?)132019181716161514141414131313131218161616151414
Wave
Graph
(?)Metric surfscale
Energy kJ (?)44614186007286446364993503462451891401091087853539491151134167160
Wind
(km/h)
10
ENE
5
ENE
5
WSW
5
WSW
5
SW
5
ESE
5
NE
5
NE
5
NE
5
NNE
5
SW
5
S
5
NNW
10
N
5
ESE
5
SE
10
E
5
E
5
SSW
5
SW
0
NNE
5
NE
5
NNE
5
NE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		offglassononglassoffglassglassglassglassglassglasscross-
off		glassglasscross-
off		cross-
off		glassglassglassglasscross-
off		off
High Tide
/ height (m)
4:10AM
0.79
4:12PM
0.28
4:43AM
0.77
4:53PM
0.30
5:14AM
0.74
5:37PM
0.32
Low Tide
/ height (m)
11:04AM
0.06
9:20PM
-0.03
11:32AM
0.05
10:01PM
-0.01
11:59AM
0.03
10:45PM
0.02
Sunday
18
Monday
19
Tuesday
20
Wed
21
Sunrise-7:05-------7:05-------7:05------
Sunset----6:07-------6:07-------6:08---
clear
clear
clear
part cloud
part cloud
cloud
part cloud
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
clear
part cloud
part cloud
part cloud
clear
clear
Rain (mm)
------------------------
Temp. °C202023242423232221222424242323232222242424232222
Feels °C (?)191923242423232221232425252324242222252525242322
  • 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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