Surf Forecasts:
Mahai'ula Bay surf forecast from 30 Aug 2026:
- Most powerful swell: Friday 4 Sep, 11AM (local time) - 1ft (0.3m), 12s period, W swell with 26 kJ wave energy.
Best Forecast Surf Conditions for Mahai'ula Bay this week:
The most powerful waves expected at Mahai'ula Bay in the next 16 days are 0.3m 12s and forecast to arrive on Friday (Sep 04) at 11AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 7s period and expected on Saturday (Sep 05) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Fri 4th Sep) | 1ft (0.3m) 12s |
Table - best surf conditions forecast for Mahai'ula Bay over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's break down what's happening at Mahai'ula Bay.
Honestly, I gotta be straight with you – the outlook for the next two weeks is a real bummer. We're looking at a long stretch of nothing. The first solid week and a half is basically a write-off with zero surf energy. We're talking from August 29th all the way through to September 8th with no wave energy to speak of. You'll see some tiny bumps on September 1st, but at 1ft and a weak energy of just 9, it's barely a ripple. You'd be better off taking the kayak out.
We finally see a pulse of real energy arriving around September 9th. A new groundswell starts to push in, with the swell direction from the West. The wave energy jumps to moderate readings, hitting 66 on the 9th morning, climbing to 111 by the 10th afternoon, and peaking around 134 on the 11th afternoon. The swell size stays small, though, only reaching 2ft with a nice long period dipping into the 13 to 14-second range. That long period will give the waves some shape, but it's still not going to be a big day.
The water temperature is sitting at 82°F, which is about 2°F warmer than usual for this time of year. Liking that.
Now, because there's not a single standout session in the whole 16-day window, I have to pick the best of a weak bunch. The pick of the litter is Thursday, September 10th. The morning shows a 1-2ft West swell at 13 seconds, with a moderate energy of 84. The wind is a bit of a cross-shore, but the afternoon shows a 1-2ft West swell with a period of 12 seconds and a solid 111 energy reading. The wind is directly onshore, but the water’s likely to be clean enough for a beginner.
If you're a beginner, the Wednesday, September 9th afternoon session might be alright. A 1-2ft West swell with a 14-second period, and the energy is climbing to 97. The wind's a cross-shore, which is manageable. The long period will make the waves a bit more lined up, but this is a beach break so it might be a bit straight.
The best chance for a clean, glassy wave is Tuesday, September 1st afternoon. The swell is tiny at 1ft, but the wind is dead calm – glassy. It's a total knee-slapper, but if you're desperate for a paddle, it's the cleanest the water will be.
The setup is so small for so long, it's fair to say the conditions aren't really for paddle surfing. With the light winds and tiny swell, this is more of a stand-up paddle or a swim day.
Rusty, signing off.
Short Range ForecastMostly dry. Warm (max 28°C on Mon afternoon, min 25°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 28°C on Tue morning, min 25°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | S 13 | S 13 | SW 17 | S 12 | SW 15 | SW 8 | SW 15 | S 19 | S 19 | SW 8 | WSW 8 | S 16 | S 16 | S 15 | S 15 | W 9 | S 14 | W 13 | W 12 | WNW 11 | WNW 11 |
Wave Graph | |||||||||||||||||||||
0 | 0 | 0 | 0 | 0 | 17 | 0 | 0 | 0 | 9 | 11 | 0 | 0 | 0 | 0 | 7 | 0 | 14 | 26 | 13 | 12 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | cross | glassy | glassy | glassy | cross-on | cross | cross-off | cross-on | glassy | glassy | cross-on | cross | glassy | cross-on | glassy | cross-off | cross | cross-on | glassy |
High Tide | 4:36PM0.69m | 5:14AM0.62m | 5:03PM0.63m | 5:56AM0.66m | 5:30PM0.55m | 6:44AM0.67m | 5:58PM0.47m | 7:43AM0.68m | 6:27PM0.39m | 8:58AM0.68m | 6:59PM0.32m | 10:26AM0.70m | 9:25PM0.26m | ||||||||
Low Tide | 10:22AM0.13m | 11:01PM0.07m | 11:07AM0.17m | 11:24PM0.06m | 11:58AM0.22m | 11:50PM0.07m | 1:00PM0.27m | 00:21AM0.07m | 2:28PM0.32m | 00:59AM0.09m | 5:04PM0.31m | 1:54AM0.12m | 7:14PM0.25m | 3:19AM0.14m | |||||||
6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | |
— | 6:42 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 27 | 27 | 27 | 27 | 26 | 27 | 28 | 26 | 28 | 28 | 26 | 28 | 28 | 27 | 27 | 28 | 26 | 27 | 28 | 27 |
Feels °C | 30 | 30 | 30 | 28 | 30 | 28 | 29 | 31 | 29 | 31 | 31 | 30 | 30 | 31 | 31 | 29 | 31 | 27 | 27 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | NNE 6 | NNE 6 | NNE 6 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 8 | NNE 6 | NNE 7 | S 16 | S 16 | S 15 | S 15 | S 14 | NNE 6 | NNE 5 | NNE 6 | S 13 | NNE 6 |
32 | 47 | 40 | 57 | 57 | 50 | 86 | 104 | 88 | 62 | 99 | 548 | 507 | 458 | 343 | 261 | 110 | 34 | 68 | 168 | 91 | |
Swell 2 Height (m) Direction Period (s) | S 13 | S 13 | S 12 | S 12 | S 11 | S 11 | S 11 | S 10 | S 19 | SSW 18 | S 18 | NNE 8 | NNE 8 | NNE 7 | NNE 7 | S 10 | S 14 | S 13 | S 13 | SSW 13 | S 13 |
121 | 160 | 73 | 68 | 86 | 84 | 79 | 78 | 267 | 528 | 404 | 91 | 50 | 66 | 54 | 30 | 239 | 229 | 171 | 17 | 119 | |
Swell 3 Height (m) Direction Period (s) | S 13 | SW 17 | SW 17 | SSW 12 | SW 15 | SSW 15 | SW 15 | S 19 | S 10 | SW 14 | S 12 | S 10 | S 11 | S 11 | S 10 | W 9 | S 10 | W 13 | WNW 12 | WNW 11 | WNW 11 |
121 | 74 | 135 | 49 | 112 | 76 | 110 | 188 | 47 | 52 | 73 | 31 | 58 | 37 | 51 | 7 | 17 | 14 | 14 | 13 | 12 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | SW 8 | — | — | — | SW 8 | WSW 8 | — | — | — | — | NNE 6 | S 3 | — | W 12 | NNE 6 | — |
— | — | — | — | — | 17 | — | — | — | 9 | 11 | — | — | — | — | 80 | 1 | — | 26 | 68 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 100 | 11 | 19 | 100 | 1 | 1 | 15 | 24 | 1 | 99 | 1 | 1 | 100 | 100 | 18 | 100 | 1 | 18 | 100 | 18 | 1 |
Best forecast wave conditions in Big Island | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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Information about the Mahai'ula Bay Surf forecast
The above surf forecast table for Mahai'ula Bay provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Mahai'ula Bay can be found by selecting the local surf guide option on the grey menu. Our Mahai'ula Bay 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 (Mahai'ula Bay) 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 Mahai'ula Bay 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.
Mahai'ula Bay is 100 km (62 miles) from Hilo. If you plan a vacation in Big Island, look for hotels and other accommodation in Hilo. Hilo has rooms for a wide range of budgets as well as car hire and transport links.











