
Surf Forecasts:
Waiaha Rivermouth / Honls surf forecast from 12 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 2AM (local time) - 2.5ft (0.7m), 19s period, S swell with glassy winds.
- Most powerful swell: Thursday 13 Aug, 2AM (local time) - 4.5ft (1.3m), 16s period, SSW swell with 905 kJ wave energy.
- Next surfable swell (1★+): Wednesday 12 Aug, 2AM (local time) - 2.5ft (0.7m), 19s period with S swell.
Best Forecast Surf Conditions for Waiaha Rivermouth / Honls this week:
The surf forecast for Waiaha Rivermouth / Honls over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 12) at 2AM. The primary swell is predicted to be 0.7m and 19s period with a secondary swell of 0.9m and 13s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Waiaha Rivermouth / Honls in the next 16 days are 1.3m 16s and forecast to arrive on Thursday (Aug 13) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 5s period and expected on Tuesday (Aug 18) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Wed 12th Aug) | 2.5ft (0.7m) 19s |
| Best Surf | 2AM (Wed 12th Aug) | 2.5ft (0.7m) 19s |
| Most Powerful | 2AM (Thu 13th Aug) | 4.5ft (1.3m) 16s |
Table - best surf conditions forecast for Waiaha Rivermouth / Honls over the next 16 days.
The Lowdown
Alright, Rusty here. Let's take a look what we've got in the water for the next couple of weeks.
Alright, straight up, the coming days are a bit of a slow burn. Swell energy is moderate, in the 700 to 800 range, but the wind is just a bit messy for the most part. The real window is short, but there's one session that stands out.
Our main spot is Waiaha Rivermouth / Honls, a reef break that needs a good SSW direction to really line up. It's an advanced wave, and it's fairly consistent, but don't be surprised if it gets a little localised there.
Thursday, August 13th afternoon is your best bet. The swell is 4ft from the SSW, with a period of 15 seconds. That's proper groundswell energy, and because it's a reef, those long-period lines will wrap in nicely. The wind is dead calm. Glassy. It's going to be clean as a whistle. The combined swell energy sits at 707 (moderate), but with that direction and those conditions, it'll be the pick of the fortnight. Crowds are possible at this spot, so get in early if you can.
The rest of the first week is a write-off for quality. Wind is mostly cross-onshore or variable, holding things back. Friday the 14th and Saturday the 15th have clean-ish looking conditions with cross-offshore winds and some smaller S swell (3ft to 3ft), but the period drops off, and the energy fades into the 300s. It’s there, but nothing to write home about.
Then we hit a rough patch. From Sunday the 16th right through to Wednesday the 21st, the swell drops below 3ft and the periods become inconsistent. Wind is all over the place, with some storms popping up. It’s a proper gap of low-quality days. Don’t bother paddling out unless you’re desperate.
Things start to stir again in the second week. Sunday, August 23rd see a pulse of 3ft to 3ft from the SSW at 15 seconds, but the wind is still cross-onshore. The energy bumps back into the 400s, but the conditions are marginal.
Finally, on Monday, August 24th afternoon, a real glimmer. The swell is small, 2ft from the SSW, but the period is a very long 17 seconds. The wind goes glassy again. The combined energy is moderate at 431, but for a reef setup, that long period is a beautiful thing. It’ll be clean and lined up. Worth a session if you’ve got a log or a fish.
From there, the tail end of the outlook shows another short window on Wednesday, August 26th afternoon with glassy conditions and 3ft swell, but the direction is a bit more SSW, and the quality isn’t quite as high as the 24th.
Sum it up: The best session is Thursday afternoon, August 13th. There’s a promising but less certain shot on Monday afternoon, August 24th too. The rest of the first week and the start of the second are pretty average.
Keep an eye on the sky. The forecasts can change.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Tue night. Warm (max 28°C on Wed morning, min 25°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 29mm), heaviest during Sat afternoon. Warm (max 29°C on Sat afternoon, min 26°C on Fri night). Winds decreasing (strong winds from the S on Sat night, calm by Sun night). | ||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | ||||||||||||||
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 19 | S 18 | S 17 | SSW 16 | S 16 | SSW 15 | S 15 | S 14 | S 14 | SSW 13 | S 13 | S 13 | S 14 | S 6 | S 13 | S 15 | S 14 | S 14 | S 13 |
Wave Graph | |||||||||||||||||||
361 | 620 | 579 | 905 | 589 | 666 | 619 | 508 | 417 | 299 | 284 | 284 | 243 | 283 | 222 | 343 | 329 | 253 | 165 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | cross-on | cross | cross-on | glassy | glassy | cross-on | cross-off | cross-off | cross-off | cross-off | cross-on | cross-on | cross-on | cross-off | on | cross | cross-on |
High Tide | 3:20AM0.32m | 3:51PM0.77m | 4:06AM0.37m | 4:26PM0.72m | 4:52AM0.41m | 5:00PM0.64m | 5:39AM0.45m | 5:32PM0.56m | 6:30AM0.48m | 6:02PM0.48m | 7:25AM0.51m | 6:32PM0.40m | |||||||
Low Tide | 10:17PM0.05m | 8:48AM-0.01m | 10:47PM0.04m | 9:38AM0.02m | 11:16PM0.04m | 10:28AM0.07m | 11:43PM0.04m | 11:20AM0.13m | 00:10AM0.05m | 12:19PM0.19m | 00:37AM0.06m | 1:31PM0.24m | 1:08AM0.07m | ||||||
— | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | |
6:53 | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — | |
mm | 3 | — | — | — | — | — | — | — | — | 1 | 1 | 9 | 10 | 4 | 2 | 1 | — | 1 | 3 |
Temp °C | 26 | 28 | 28 | 27 | 28 | 28 | 26 | 28 | 28 | 27 | 28 | 29 | 29 | 29 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 29 | 31 | 31 | 31 | 31 | 31 | 30 | 30 | 31 | 31 | 31 | 30 | 27 | 30 | 30 | 32 | 30 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | S 18 | S 17 | SSW 16 | S 16 | SSW 15 | S 15 | S 14 | S 14 | SSW 13 | S 13 | S 13 | S 14 | S 16 | S 13 | S 15 | S 14 | S 14 | S 13 |
290 | 620 | 579 | 905 | 589 | 666 | 619 | 508 | 417 | 299 | 284 | 284 | 243 | 185 | 222 | 343 | 329 | 253 | 165 | |
Swell 2 Height (m) Direction Period (s) | S 19 | SSW 13 | SSW 13 | SSW 12 | SSW 12 | WNW 12 | WNW 12 | WNW 11 | WNW 12 | WNW 12 | NW 7 | WNW 11 | S 18 | WNW 13 | S 16 | S 5 | WNW 11 | WNW 11 | WNW 11 |
361 | 238 | 238 | 195 | 111 | 27 | 28 | 25 | 27 | 27 | 12 | 24 | 97 | 55 | 127 | 11 | 41 | 41 | 41 | |
Swell 3 Height (m) Direction Period (s) | W 11 | W 11 | WNW 13 | — | WNW 12 | SW 19 | SW 18 | SW 18 | SW 17 | SW 17 | WNW 11 | S 18 | NNW 6 | SW 19 | WNW 12 | WNW 12 | SSW 18 | SSW 19 | W 5 |
65 | 21 | 56 | — | 28 | 14 | 13 | 12 | 12 | 12 | 24 | 56 | 11 | 15 | 49 | 46 | 31 | 37 | 2 | |
Wind waves Height (m) Direction Period (s) | — | — | — | WNW 12 | — | — | — | — | — | — | — | — | — | S 6 | S 5 | — | — | WNW 5 | — |
— | — | — | 56 | — | — | — | — | — | — | — | — | — | 283 | 64 | — | — | 5 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 6 | 119 | 81 | 6 | 0 | 0 | 85 | 0 | 0 | 0 | 0 | 71 | 19 | 47 | 81 | 119 | 100 | 1 |
Best forecast wave conditions in Big Island | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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Information about the Waiaha Rivermouth / Honls Surf forecast
The above surf forecast table for Waiaha Rivermouth / Honls provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Waiaha Rivermouth / Honls can be found by selecting the local surf guide option on the grey menu. Our Waiaha Rivermouth / Honls 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 (Waiaha Rivermouth / Honls) 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 Waiaha Rivermouth / Honls 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.
Waiaha Rivermouth / Honls is 95 km (59 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.











