Surf Forecasts:
Waiaha Rivermouth / Honls surf forecast from 19 Aug 2026:
- Best quality surf: Thursday 20 Aug, 8PM (local time) - 1.5ft (0.5m), 16s period, SW swell with glassy winds.
- Most powerful swell: Friday 21 Aug, 5AM (local time) - 2.5ft (0.7m), 17s period, SW swell with 298 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 11PM (local time) - 1.5ft (0.5m), 13s 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 Tuesday (Aug 18) at 11PM. The primary swell is predicted to be 0.5m and 13s period with a secondary swell of 0.3m and 11s. 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 0.7m 17s and forecast to arrive on Friday (Aug 21) at 5AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Saturday (Aug 22) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Tue 18th Aug) | 1.5ft (0.5m) 13s |
| Best Surf | 8PM (Thu 20th Aug) | 1.5ft (0.5m) 16s |
| Most Powerful | 5AM (Fri 21st Aug) | 2.5ft (0.7m) 17s |
Table - best surf conditions forecast for Waiaha Rivermouth / Honls over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's on the table for the next couple of weeks.
Right off the bat, we're looking at a pretty flat start. The first few days are a real struggle, with barely a ripple to get excited about. We've got a solid gap of nothing doing from the beginning until we start seeing some potential. The first real chance of anything worth paddling out for pops up around Sunday the 23rd.
The pick of the whole run is going to be Waiaha Rivermouth / Honls. This is a reef break that really needs a good south-southwest swell to come alive, and it's exposed to that direction. The water temp is sitting at 82°F, which is bang on average for this time of year, so no need for a thick wetsuit.
So, let's break it down. Sunday the 23rd afternoon, we get a glimpse of hope. The wind goes glassy, and there's a small 1ft swell from the south-southwest with a long period of 15 seconds. That's a proper groundswell, and even though it's small, the glassy conditions and the long period mean it could be clean and fun for the advanced crew. The combined energy is moderate at 200.
The real action, the one that gets the heart pumping, is looking like Monday the 31st of August and Tuesday the 1st of September. Monday afternoon is the standout. The swell is predicted to be 6ft from the south-southwest, with an 11-second period. The wind is forecast to be glassy from the southeast. This is an excellent surf condition for experienced surfers, with a strong combined wave energy of 1008. It's going to be big and powerful, so definitely not for beginners. With the break being rated as "often" crowded, expect a few other keen locals out there for this one.
Tuesday the 1st of September afternoon also looks fantastic. The swell drops slightly to 4ft from the southwest, 11-second period, but the wind stays glassy. This is cleaner and more manageable, with a very good energy reading of 602. This is the session for the surfer who wants quality without the maxed-out size.
There are a few other moments worth mentioning. Wednesday the 2nd of September afternoon sees a clean 4ft swell from the west-southwest with a cross-offshore wind, which is a nice setup for a point break style wave. Even later, around the 30th of August, the swell really starts to pump, hitting 6ft with a combined energy of 1096, but the wind is cross-onshore, which will mess up the face. It's a shame because the energy is there.
So, the long and short of it: be patient through the first week. The second week, particularly the 31st of August and 1st of September, are the ones to circle on the calendar. Keep your eyes on the forecast for those days, as it's a bit further out, but the potential is huge.
Rusty, signing off.
Short Range ForecastMostly dry. Warm (max 27°C on Tue morning, min 26°C on Tue morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 28°C on Sat morning, min 26°C on Fri morning). Wind will be generally light. | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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 18 | SW 16 | SW 16 | SW 16 | SW 18 | SW 17 | SSW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | WNW 12 | WNW 11 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 12 |
Wave Graph | |||||||||||||||||||||
117 | 125 | 55 | 73 | 71 | 68 | 150 | 143 | 188 | 127 | 122 | 206 | 119 | 119 | 125 | 99 | 88 | 120 | 104 | 137 | 169 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | cross-on | glassy | glassy | cross-on | cross | cross-on | cross-on | on | cross-off | on | cross-on | glassy | cross-on | glassy | cross-on | on | cross | glassy |
High Tide | 8:28AM0.53m | 7:04PM0.33m | 9:39AM0.55m | 7:48PM0.27m | 10:50AM0.59m | 9:25PM0.24m | 11:51AM0.62m | 11:15PM0.23m | 12:41PM0.65m | 00:27AM0.25m | 1:23PM0.68m | 1:17AM0.27m | 1:59PM0.70m | 1:58AM0.30m | |||||||
Low Tide | 3:10PM0.27m | 1:45AM0.08m | 5:22PM0.26m | 2:34AM0.09m | 7:02PM0.23m | 3:38AM0.10m | 7:46PM0.19m | 4:47AM0.10m | 8:16PM0.16m | 5:47AM0.09m | 8:43PM0.14m | 6:38AM0.07m | 9:08PM0.12m | ||||||||
6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | |
— | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 |
Temp °C | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 27 | 27 | 27 | 26 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 27 | 27 |
Feels °C | 30 | 30 | 30 | 30 | 31 | 30 | 30 | 30 | 32 | 30 | 30 | 30 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 29 | 32 |
Swell 1 Height (m) Direction Period (s) | S 13 | S 13 | S 12 | S 12 | S 12 | SW 16 | SW 18 | SW 17 | SSW 17 | SW 16 | SW 16 | SW 16 | SW 16 | W 10 | WNW 12 | WNW 11 | WNW 10 | SSW 14 | S 10 | SSW 13 | SSW 12 |
117 | 125 | 44 | 71 | 71 | 68 | 150 | 143 | 188 | 127 | 122 | 206 | 119 | 52 | 125 | 79 | 43 | 120 | 104 | 137 | 169 | |
Swell 2 Height (m) Direction Period (s) | SW 17 | SW 18 | WNW 13 | W 12 | WNW 12 | S 12 | S 11 | S 11 | WNW 11 | WNW 10 | S 13 | W 10 | W 10 | SW 16 | SW 15 | SSW 16 | SSW 15 | WNW 11 | SSW 14 | S 9 | S 9 |
75 | 80 | 55 | 73 | 48 | 44 | 21 | 21 | 39 | 35 | 55 | 53 | 51 | 119 | 110 | 99 | 88 | 44 | 104 | 60 | 56 | |
Swell 3 Height (m) Direction Period (s) | WNW 11 | WNW 11 | SW 18 | SW 16 | SW 16 | WNW 11 | WNW 11 | WNW 11 | S 11 | S 11 | WNW 10 | S 13 | S 12 | S 12 | SSE 13 | SW 14 | SSE 13 | SSE 13 | NW 11 | SSW 18 | SSW 16 |
24 | 24 | 48 | 67 | 65 | 25 | 23 | 23 | 21 | 37 | 34 | 89 | 46 | 45 | 54 | 54 | 67 | 53 | 29 | 103 | 149 | |
Wind waves Height (m) Direction Period (s) | W 6 | W 6 | — | — | — | — | — | — | — | — | — | — | SW 10 | SW 3 | — | NW 5 | SW 3 | NW 5 | — | — | NW 3 |
7 | 7 | — | — | — | — | — | — | — | — | — | — | 26 | 3 | — | 4 | 2 | 4 | — | — | 2 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 119 | 100 | 19 | 81 | 0 | 0 | 50 | 19 | 2 | 50 | 4 | 0 | 50 | 47 | 0 | 50 | 0 | 2 | 96 | 96 | 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.











