Surf Forecasts:
Mahai'ula Bay surf forecast from 15 Jul 2026:
- Best quality surf: Wednesday 15 Jul, 11PM (local time) - 3ft (0.9m), 15s period, WNW swell with glassy winds.
- Most powerful swell: Wednesday 15 Jul, 8AM (local time) - 3ft (0.9m), 16s period, WNW swell with 411 kJ wave energy.
- Next surfable swell (1★+): Wednesday 15 Jul, 11PM (local time) - 3ft (0.9m), 15s period with WNW swell.
Best Forecast Surf Conditions for Mahai'ula Bay this week:
The surf forecast for Mahai'ula Bay over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Jul 15) at 11PM. The primary swell is predicted to be 0.9m and 15s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Mahai'ula Bay in the next 16 days are 0.9m 16s and forecast to arrive on Wednesday (Jul 15) at 8AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 16s period and expected on Monday (Jul 20) at 8AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Wed 15th Jul) | 3ft (0.9m) 15s |
| Best Surf | 11PM (Wed 15th Jul) | 3ft (0.9m) 15s |
| Most Powerful | 8AM (Wed 15th Jul) | 3ft (0.9m) 16s |
Table - best surf conditions forecast for Mahai'ula Bay over the next 16 days.
The Lowdown
Alright folks, Rusty here. Honestly, the outlook for the next 16 days is a bit of a bummer. We've got a real flat spell on the horizon. The first few days offer some small, cleanish waves, but nothing that’s gonna get the heart pounding. For the most part, the swell window is just not cooperating.
The best bet, and really the only one worth paddling out for, is Mahai'ula Bay. The action kicks off on Wednesday, 15 July. We’ve got a long-period WNW groundswell rolling in at 3 ft, with a 16-second period, packing moderate energy (406). That’s a proper groundswell, so it’ll have some punch and shape, especially on the sets. The wind is a bit of a cross-on breeze from the NW, so it’ll be a little choppy, but it’s manageable. The water temp is about average for this time of year. This is a beginner-friendly break, but that 16-second period swell can make it a bit tricky at a beach break, as it tends to wall up and close out in sections. The crowd factor is "sometimes" here, so you might have a few friends out, but it shouldn't be a zoo.
Moving into Thursday, 16 July, the swell holds at 3 ft, but the period drops a little to 15 seconds, and the energy is still moderate (360). The wind swings to a light cross-on from the SW, which will keep the surface a bit rippled, but it's still surfable. The conditions are nothing special, but it’s the most on offer.
By Friday, 17 July, the swell is already fading. We’re down to 2.5 ft from the W, and the period drops to 14 seconds, with energy slipping to 264. The wind is offshore from the W in the morning, which is a nice touch, but the wave size is fading fast. By Saturday, 18 July, we’re down to 2 ft, and the energy is weak (135). For the rest of the week and into the next, the swell just disappears.
From Sunday, 19 July, through to the end of the period, the forecast is a flat, dry spell. There are a few tiny pulses of windswell later in the second week, like a 1.5 ft from the SW on 26 July, but the energy is weak (17) and the conditions are poor. It’s just a long stretch of nothing.
Short Range ForecastMostly dry. Warm (max 27°C on Thu morning, min 25°C on Wed morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 7mm), mostly falling on Sat night. Warm (max 27°C on Sat morning, min 25°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | |||||||||||||||
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) | WNW 16 | WNW 16 | WNW 15 | WNW 15 | WNW 15 | WNW 14 | W 14 | W 14 | W 14 | W 13 | W 13 | W 13 | S 13 | S 18 | S 17 | S 16 | S 15 | W 8 | S 14 | S 14 | S 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 406 | 400 | 380 | 360 | 355 | 280 | 264 | 198 | 187 | 126 | 87 | 87 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross | cross-on | cross-on | cross-on | glassy | cross-on | cross-on | glassy | on | cross-on | glassy | on | cross | on | glassy | cross | cross | cross-on | cross | cross-on |
High Tide | 5:04PM0.91m | 5:19AM0.41m | 5:42PM0.85m | 6:13AM0.45m | 6:17PM0.77m | 7:09AM0.48m | 6:50PM0.67m | 8:11AM0.52m | 7:20PM0.57m | 9:19AM0.56m | 7:48PM0.48m | 10:31AM0.59m | 8:18PM0.40m | ||||||||
Low Tide | 9:53AM0.01m | 00:05AM0.08m | 10:42AM0.06m | 00:39AM0.08m | 11:32AM0.14m | 1:11AM0.09m | 12:27PM0.22m | 1:43AM0.10m | 1:31PM0.30m | 2:14AM0.11m | 2:59PM0.36m | 2:49AM0.12m | 5:16PM0.38m | 3:30AM0.14m | |||||||
 |  |  | | | | | |  | | |  | | | | | | | | | | |
 | 5:52 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — |
 | — | 7:06 | — | — | 7:06 | — | — | 7:06 | — | — | 7:05 | — | — | 7:05 | — | — | 7:05 | — | — | 7:05 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | 4 | — | — | 2 | — | — | 1 |
Temp °C | 26 | 26 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 26 | 25 | 27 | 27 | 26 | 27 | 27 | 26 |
Feels °C | 28 | 28 | 28 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 29 | 28 | 27 | 30 | 29 | 28 | 29 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | WNW 16 | WNW 16 | WNW 15 | WNW 15 | WNW 15 | WNW 14 | W 14 | W 14 | NNE 6 | SSW 14 | NNE 6 | NNE 7 | NNE 7 | NNE 6 | NNE 6 | S 16 | S 15 | S 15 | S 14 | S 14 | S 11 |
| kJ | 406 | 400 | 380 | 360 | 355 | 280 | 264 | 198 | 34 | 158 | 35 | 40 | 41 | 33 | 31 | 502 | 441 | 418 | 395 | 239 | 112 |
Swell 2 Height (m) Direction Period (s) | SW 13 | SW 14 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | SSW 16 | SSW 14 | W 13 | SSW 14 | S 12 | S 13 | S 18 | S 17 | NNE 8 | NNE 5 | NNE 7 | NNE 7 | NNE 6 | S 13 |
| kJ | 134 | 206 | 44 | 30 | 59 | 41 | 40 | 259 | 218 | 126 | 158 | 108 | 115 | 162 | 200 | 22 | 20 | 34 | 30 | 37 | 173 |
Swell 3 Height (m) Direction Period (s) | SSW 18 | NNE 7 | SW 16 | SW 12 | SSW 14 | SSW 17 | S 16 | NNE 7 | W 14 | NNE 6 | W 13 | W 13 | S 19 | SSW 13 | S 12 | SW 18 | SW 18 | SW 16 | SSW 12 | S 12 | NNE 7 |
| kJ | 204 | 20 | 201 | 73 | 131 | 166 | 131 | 40 | 187 | 23 | 87 | 87 | 112 | 93 | 69 | 83 | 81 | 69 | 30 | 103 | 29 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | N 7 | — | — | — | — | S 4 | — | — | — | — | — | — | W 8 | — | — | NNE 7 |
| kJ | — | — | — | — | — | 36 | — | — | — | — | 2 | — | — | — | — | — | — | 1 | — | — | 15 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 36 | 4 | 18 | 34 | 14 | 0 | 32 | 14 | 0 | 34 | 25 | 0 | 100 | 38 | 97 | 99 | 24 | 19 | 99 | 38 | 19 |
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.
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