Surf Forecasts:
Hapuna surf forecast from 18 Aug 2026:
- Most powerful swell: Friday 21 Aug, 8AM (local time) - 1.5ft (0.4m), 17s period, SW swell with 73 kJ wave energy.
Best Forecast Surf Conditions for Hapuna this week:
The most powerful waves expected at Hapuna in the next 16 days are 0.4m 17s and forecast to arrive on Friday (Aug 21) at 8AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 6s period and expected on Friday (Aug 21) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Fri 21st Aug) | 1.5ft (0.4m) 17s |
Table - best surf conditions forecast for Hapuna over the next 16 days.
The Lowdown
Alright, let’s get real about the next couple of weeks. To be honest, the shop is gonna be quiet for a while. The data's all showing a pretty flat and weak run of surf for the foreseeable future. We’ve got a long stretch of nothing here, so don’t hold your breath.
Right off the bat, from now through the 26th of August, it’s basically a lake out there. We’re talking ankle-biters, with waves hovering around 0.7ft to 1ft. The energy is dismal, mostly in the 20s and 30s, with only a brief bump to 104 on the afternoon of the 23rd, but it’s still just a weak pulse. There’s no push, no power. It’s a paddling session at best. If you’re really keen, the mornings are cleaner, but it’s a whole lot of nothing.
Now, we do see a pulse of proper energy trying to push in toward the very end of the month. The first glimmer of hope arrives on Thursday the 27th. The swell starts to fill in from the SSW, and while the morning is still rough, the afternoon brings a more surfable 3ft wave with clean conditions. The energy jumps up to 231, which finally feels like we have something to work with.
Then, things get interesting. The standout window is Friday the 28th and Saturday the 29th. This is the real deal. Friday afternoon we see 4ft of SW swell with a 12-second period and clean, offshore winds. The energy is pumping at 546. This is when you want to be in the water. Saturday holds that momentum, with 5ft of WSW swell in the morning and 5ft in the afternoon, and a combined energy reading of 577 and 522 respectively. This is the pick of the entire window. It’s still a fair size, so it might be a bit much for the groms, but for anyone with a bit of experience, this is your window. This is the standout, mark my words.
After that, it backs right off again. The energy drops through Sunday the 30th and into the following week, so we're back to small, weak dribbles. Looks like the last week of August into early September is a write-off.
One thing to note, when we do see that pulse on the 28th and 29th, the water is running warm, quite a bit warmer than usual for the time of year, so you might not even need a springsuit. It’s all about that 48-hour window at the end of the week. Be ready for it.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Mon afternoon, min 25°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Fri afternoon. Warm (max 29°C on Sat morning, min 25°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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 11 | WNW 11 | WNW 11 | WNW 11 | WNW 13 | WNW 12 | WNW 12 | SW 16 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 16 | SW 15 | WNW 12 | WNW 11 | WNW 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 24 | 25 | 25 | 25 | 33 | 48 | 48 | 41 | 49 | 47 | 69 | 69 | 39 | 64 | 37 | 63 | 36 | 55 | 45 | 20 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | off | cross-on | cross-off | off | cross-on | cross-off | glassy | cross-on | glassy | glassy | cross-on | glassy | glassy | cross | glassy | cross-off | cross-off | cross-off | cross-off |
High Tide | 6:51PM0.41m | 8:37AM0.54m | 7:15PM0.33m | 9:44AM0.55m | 7:33PM0.25m | 10:59AM0.57m | 12:08PM0.59m | 11:45PM0.18m | 1:04PM0.62m | 1:02AM0.20m | 1:49PM0.66m | 1:48AM0.23m | ||||||||
Low Tide | 1:21AM0.04m | 3:09PM0.25m | 1:51AM0.05m | 5:41PM0.25m | 2:31AM0.07m | 3:32AM0.09m | 8:34PM0.15m | 8:53PM0.12m | 6:05AM0.06m | 9:13PM0.10m | ||||||||||
 |  | | | | | | |  | | | |  |  | | |  | | | | |
 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — |
 | 6:50 | — | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | — | 6:46 | — | — | 6:45 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — |
Temp °C | 28 | 26 | 27 | 27 | 26 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 26 | 29 | 29 | 27 | 28 | 28 | 27 |
Feels °C | 33 | 29 | 30 | 31 | 29 | 31 | 31 | 30 | 31 | 32 | 32 | 31 | 32 | 31 | 31 | 32 | 31 | 29 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | NE 6 | NNE 5 | NNE 5 | WNW 11 | NNE 4 | WNW 12 | WNW 12 | NNE 6 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NE 6 | NE 7 | NE 6 | NE 5 | WNW 10 | WNW 12 | NNE 6 | NE 6 |
| kJ | 45 | 17 | 15 | 25 | 8 | 48 | 48 | 22 | 33 | 31 | 31 | 30 | 43 | 44 | 38 | 23 | 33 | 55 | 53 | 38 |
Swell 2 Height (m) Direction Period (s) | WNW 11 | NE 8 | WNW 11 | ENE 7 | WNW 13 | NE 7 | SW 16 | WNW 11 | SW 18 | SW 17 | SW 16 | W 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 12 | WNW 10 | WNW 11 | WNW 10 |
| kJ | 24 | 9 | 25 | 5 | 33 | 12 | 42 | 25 | 49 | 47 | 69 | 19 | 20 | 35 | 33 | 34 | 28 | 32 | 45 | 18 |
Swell 3 Height (m) Direction Period (s) | S 14 | WNW 11 | NE 8 | W 13 | ENE 7 | NNE 7 | W 7 | SW 16 | WNW 11 | W 11 | W 11 | SW 16 | SW 16 | SW 16 | SW 15 | SW 16 | SW 15 | SW 15 | SSW 14 | SSW 14 |
| kJ | 16 | 25 | 9 | 14 | 5 | 9 | 4 | 41 | 24 | 21 | 20 | 69 | 39 | 64 | 37 | 63 | 36 | 34 | 21 | 20 |
Wind waves Height (m) Direction Period (s) | — | — | — | NNE 5 | — | — | NNE 6 | — | — | — | — | — | — | — | — | — | NE 5 | NNE 6 | — | — |
| kJ | — | — | — | 16 | — | — | 23 | — | — | — | — | — | — | — | — | — | 25 | 49 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 87 | 32 | 32 | 87 | 41 | 44 | 87 | 3 | 6 | 29 | 3 | 3 | 6 | 84 | 3 | 91 | 3 | 3 | 3 | 6 |
Best forecast wave conditions in Big Island | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
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Information about the Hapuna Surf forecast
The above surf forecast table for Hapuna provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Hapuna can be found by selecting the local surf guide option on the grey menu. Our Hapuna 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 (Hapuna) 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 Hapuna 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.
Hapuna is 84 km (52 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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