Surf Forecasts:
Waiaha Rivermouth / Honls surf forecast from 9 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 2AM (local time) - 2.5ft (0.7m), 19s period, S swell with cross-offshore winds.
- Most powerful swell: Thursday 13 Aug, 2AM (local time) - 4.5ft (1.3m), 16s period, S swell with 879 kJ wave energy.
- Next surfable swell (1★+): Sunday 9 Aug, 2AM (local time) - 1.5ft (0.4m), 18s period with SSW 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 Sunday (Aug 09) at 2AM. The primary swell is predicted to be 0.4m and 18s period with a secondary swell of 0.5m and 13s. Another secondary swell of 0.4m and 17s is also forecast. 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 glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Sunday (Aug 09) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Sun 9th Aug) | 1.5ft (0.4m) 18s |
| 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 folks, Rusty here with a look at what we've got cookin' for the next couple weeks at Waiaha Rivermouth, also known as Honls.
The first week is a bit of a slow burn, with only small, inconsistent pulses of swell. We're not looking at any kind of epic, groundswell event, but there are a few windows that should clean up nicely. The combined energy of the swell is moderate for the most part, but we see it jump up well into the hundreds on Wednesday the 12th before settling again.
Okay, let's get into it. The standout for the whole run, and what you should be aiming for, is Thursday afternoon, August 14th. The data is pointing to a solid 4ft swell from the SSW, with a period of 15 seconds. That's proper groundswell and will give those lines some nice shape and power. The key factor here, though, is the wind: it's forecast to go dead glassy from the SW. At a reef break like this, glassy conditions are king, turning a solid swell into clean, walling waves. However, with that 15-second period, the sets might come a bit more spread out. And an honest heads-up, this spot is "sometimes" crowded when it's good, so be ready to share the water.
Before that, the swell fills in a bit on Wednesday morning, August 12th, with a 3ft Southerly swell and a long period of 18 seconds. The wind is onshore but light, so it could be workable for the advanced crew who know this wave well.
After that Thursday peak, it drops off. The rest of the second week looks pretty weak and wind-affected, with most sessions being a bit of a scratch. The swell fades to the 2-2ft range and the winds become more inconsistent, making it tough to find a clean wave. We get a small spike around Friday the 21st with a glassy afternoon window, but the swell is tiny.
So, to sum it up: it's slow to start and slow to finish, with one clear, quality window in the middle of the week. For most of the run, it'll be a longboard or a bigger board kind of situation, but if you can hit that Thursday afternoon, you're in for some of the cleanest waves of the period.
Rusty, signing off.
Short Range ForecastLight rain (total 5mm), mostly falling on Mon night. Warm (max 28°C on Sat night, min 26°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Tue night. Warm (max 28°C on Wed morning, min 25°C on Tue night). Wind will be generally light. | ||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | ||||||||||||||
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) | SSW 18 | SSW 18 | S 16 | S 16 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | S 19 | S 18 | S 17 | S 16 | S 15 | SSW 15 | S 15 | S 14 | S 14 | S 13 |
Wave Graph  | |||||||||||||||||||
 kJ | 109 | 102 | 135 | 183 | 314 | 240 | 231 | 276 | 265 | 361 | 620 | 579 | 879 | 581 | 775 | 619 | 508 | 417 | 366 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | glassy | cross-off | on | cross-on | glassy | cross-on | cross-on | cross-off | on | on | glassy | on | glassy | glassy | cross-on | glassy | glassy |
High Tide | 00:37AM0.22m | 1:46PM0.80m | 1:40AM0.24m | 2:31PM0.81m | 2:32AM0.28m | 3:12PM0.81m | 3:20AM0.32m | 3:51PM0.77m | 4:06AM0.37m | 4:26PM0.72m | 4:52AM0.41m | 5:00PM0.64m | |||||||
Low Tide | 8:33PM0.11m | 6:04AM-0.01m | 9:11PM0.08m | 7:03AM-0.02m | 9:45PM0.06m | 7:57AM-0.02m | 10:17PM0.05m | 8:48AM-0.01m | 10:47PM0.04m | 9:38AM0.02m | 11:16PM0.04m | 10:28AM0.07m | 11:43PM0.04m | ||||||
 |  |  | | | |  |  | | | | | | | | | | | | |
 | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — |
 | 6:55 | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — |
mm | — | — | 2 | — | — | 1 | 2 | — | — | 1 | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 28 | 27 | 27 | 28 | 27 | 27 | 28 | 28 | 26 | 28 | 27 | 27 | 28 | 28 | 26 | 28 | 28 | 26 |
Feels °C | 33 | 31 | 30 | 31 | 31 | 30 | 32 | 31 | 32 | 29 | 30 | 29 | 30 | 31 | 31 | 30 | 31 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | SSW 13 | S 16 | S 16 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | S 18 | S 17 | S 16 | S 15 | SSW 15 | S 15 | S 14 | S 14 | S 13 |
| kJ | 99 | 96 | 135 | 183 | 314 | 240 | 231 | 276 | 265 | 295 | 620 | 579 | 879 | 581 | 775 | 619 | 508 | 417 | 366 |
Swell 2 Height (m) Direction Period (s) | SW 17 | SSW 18 | SSW 12 | SSW 12 | WNW 11 | SSW 11 | S 11 | W 10 | SSW 20 | S 19 | SSW 13 | SSW 13 | WNW 12 | SSW 12 | WNW 12 | WNW 12 | WNW 11 | WNW 12 | WNW 12 |
| kJ | 77 | 102 | 85 | 82 | 39 | 42 | 63 | 17 | 132 | 361 | 294 | 238 | 28 | 111 | 27 | 28 | 25 | 27 | 27 |
Swell 3 Height (m) Direction Period (s) | SSW 18 | SW 16 | W 12 | WNW 12 | SW 16 | SSW 9 | WNW 10 | S 21 | WNW 12 | WNW 11 | WNW 13 | WNW 13 | — | WNW 12 | SW 19 | SW 18 | SW 18 | SW 17 | SW 17 |
| kJ | 109 | 67 | 25 | 45 | 10 | 27 | 35 | 79 | 14 | 43 | 58 | 56 | — | 28 | 14 | 13 | 12 | 12 | 12 |
Wind waves Height (m) Direction Period (s) | — | SSW 10 | — | — | SSW 9 | N 9 | — | — | SW 10 | — | — | — | — | — | — | NNW 3 | — | — | — |
| kJ | — | 18 | — | — | 28 | 2 | — | — | 24 | — | — | — | — | — | — | 4 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 119 | 0 | 0 | 119 | 119 | 0 | 100 | 6 | 0 | 117 | 119 | 0 | 81 | 0 | 0 | 81 | 0 | 0 |
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.
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