- Forecast
- Maps
- Live
- Weather State
- Spot Information
Grandma's Surf Forecast
/ HAW – Maui (46 breaks) / Hawaii (267 breaks) /
Grandma's surfForecast / HAW – Maui / USA
12 Day Weather and Surf, issued 1 pm Tuesday 29 Apr 2025 HST
Best Forecast Surf Conditions for Grandma's this week:
The surf forecast for Grandma's over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Apr 29) at 11PM. The primary swell is predicted to be 0.4m and 16s period with a secondary swell of 0.3m and 21s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Grandma's in the next 12 days are 0.7m 18s and forecast to arrive on Wednesday (Apr 30) at 11PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 6s period and expected on Friday (May 02) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Tue 29th Apr) | 1.5ft (0.4m) 16s |
| Best Surf | 11PM (Wed 30th Apr) | 2.5ft (0.7m) 18s |
| Most Powerful | 11PM (Wed 30th Apr) | 2.5ft (0.7m) 18s |
Table - best surf conditions forecast for Grandma's over the next 12 days.
Tue 29 | Wednesday 30 | Thursday 01 | Friday 02 | Saturday 03 | Sunday 04 | Monday 05 | Tuesday 06 | Wednesday 07 | Thursday 08 | Friday 09 | Saturday 10 | Sun 11 | ||||||||||||||||||||||||
| PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Rating (10 max) | ||||||||||||||||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  |  |  |  |  |  | |||||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||||||||||||||
| Period(s) (?) | 17 | 16 | 20 | 19 | 18 | 16 | 16 | 16 | 14 | 14 | 13 | 13 | 13 | 16 | 16 | 16 | 15 | 14 | 14 | 14 | 14 | 5 | 12 | 6 | 6 | 16 | 15 | 15 | 14 | 14 | 14 | 18 | 16 | 16 | 15 | 14 |
Wave (?)Graph  | ||||||||||||||||||||||||||||||||||||
| Energy (?) | 115 | 103 | 216 | 180 | 322 | 134 | 266 | 177 | 206 | 150 | 87 | 55 | 54 | 100 | 99 | 62 | 61 | 54 | 54 | 30 | 19 | 5 | 0 | 0 | 21 | 25 | 44 | 43 | 70 | 63 | 61 | 102 | 147 | 146 | 125 | 120 |
Wind (km/h) | ||||||||||||||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | glass | glass | glass | glass | glass | off | off | glass | off | off | cross- on | cross- off | off | glass | off | off | cross- off | cross- off | off | glass | off | off | off | off | off | glass | off | off | glass | off | off | glass | off | cross- off | glass |
High Tide / height (m) | 5:53PM 0.80 | 5:51AM 0.23 | 6:47PM 0.77 | 6:55AM 0.20 | 7:44PM 0.74 | 8:15AM 0.19 | 8:44PM 0.69 | 9:39AM 0.21 | 9:44PM 0.65 | 10:53AM 0.27 | 10:41PM 0.60 | 11:53AM 0.34 | 11:32PM 0.56 | 12:43PM 0.41 | 12:19AM 0.51 | 1:25PM 0.49 | 1:01AM 0.47 | 2:04PM 0.55 | 1:41AM 0.42 | 2:40PM 0.62 | 2:20AM 0.37 | 3:16PM 0.66 | 2:58AM 0.34 | |||||||||||||
Low Tide / height (m) | 12:57AM 0.06 | 11:02AM -0.05 | 2:08AM 0.07 | 11:49AM -0.01 | 3:22AM 0.07 | 12:44PM 0.04 | 4:27AM 0.07 | 1:51PM 0.09 | 5:16AM 0.06 | 3:11PM 0.13 | 5:51AM 0.04 | 4:36PM 0.16 | 6:19AM 0.03 | 5:54PM 0.16 | 6:44AM 0.01 | 7:02PM 0.15 | 7:09AM -0.01 | 8:00PM 0.14 | 7:35AM -0.02 | 8:52PM 0.12 | 8:02AM -0.04 | 9:41PM 0.11 | 8:31AM -0.04 | |||||||||||||
Tue 29 | Wednesday 30 | Thursday 01 | Friday 02 | Saturday 03 | Sunday 04 | Monday 05 | Tuesday 06 | Wednesday 07 | Thursday 08 | Friday 09 | Saturday 10 | Sun 11 | ||||||||||||||||||||||||
| Sunrise | - | - | 5:56 | - | - | 5:56 | - | - | 5:54 | - | - | 5:54 | - | - | 5:54 | - | - | 5:52 | - | - | 5:52 | - | - | 5:52 | - | - | 5:52 | - | - | 5:50 | - | - | 5:50 | - | - | 5:50 |
| Sunset | 6:50 | - | - | 6:50 | - | - | 6:50 | - | - | 6:51 | - | - | 6:51 | - | - | 6:51 | - | - | 6:52 | - | - | 6:52 | - | - | 6:52 | - | - | 6:52 | - | - | 6:52 | - | - | 6:53 | - | - |
 |  |  |  |  | |  | | | | | | |  | | | | | | | | | | | | | | | | | | | | | | | |
Rain (mm) | 4 | 5 | - | 2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 2 | - | - | - | - | - | 1 | - | - | - | - | - | - | - | - |
| Temp. °C | 25 | 24 | 25 | 25 | 25 | 26 | 26 | 24 | 26 | 26 | 24 | 26 | 26 | 25 | 25 | 26 | 24 | 26 | 27 | 25 | 26 | 26 | 24 | 26 | 26 | 24 | 26 | 26 | 24 | 26 | 27 | 25 | 26 | 27 | 25 | 26 |
| Feels °C (?) | 26 | 26 | 27 | 27 | 28 | 28 | 27 | 25 | 28 | 26 | 25 | 27 | 27 | 26 | 27 | 28 | 25 | 27 | 29 | 25 | 28 | 27 | 23 | 27 | 26 | 24 | 28 | 28 | 23 | 28 | 28 | 25 | 28 | 28 | 26 | 28 |
Short Range Forecast: Moderate rain (total 11mm), heaviest on Tue afternoon. Warm (max 26°C on Thu morning, min 23°C on Tue night). Wind will be generally light. | Days 3-6 Weather Summary Mostly dry. Warm (max 26°C on Fri afternoon, min 23°C on Fri night). Wind will be generally light. | Days 6-9 Weather Summary Light rain (total 2mm), mostly falling on Tue afternoon. Warm (max 27°C on Mon afternoon, min 22°C on Tue night). Wind will be generally light. | Long Range Forecast: Light rain (total 2mm), mostly falling on Thu afternoon. Warm (max 27°C on Fri afternoon, min 23°C on Thu night). Wind will be generally light. | |||||||||||||||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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.
Information about the Grandma's Surf forecast
The above surf forecast table for Grandma's provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Grandma's can be found by selecting the local surf guide option on the grey menu. Our Grandma's surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Grandma's) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Grandma's may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Are you planning a vacation in Maui? If you are looking for accommodation near Grandma's, camping, hotels and condos and appartments in Maui, consider staying in Kihei which is 10 km (6 miles) away. Other places in and around Maui where you can find information about places to rent, and car hire include Wailuku which is 12 km (7 miles) away, Kahului, Lanai - Lanai and Kaunakakai - Molokai.
Nearest