
Surf Forecasts:
Manini Beach surf forecast from 16 Sep 2026:
- Best quality surf: Friday 18 Sep, 2AM (local time) - 3ft (0.9m), 17s period, SSW swell with glassy winds.
- Most powerful swell: Friday 18 Sep, 2AM (local time) - 3ft (0.9m), 17s period, SSW swell with 475 kJ wave energy.
- Next surfable swell (1★+): Wednesday 16 Sep, 8PM (local time) - 2.5ft (0.7m), 18s period with SW swell.
Best Forecast Surf Conditions for Manini Beach this week:
The surf forecast for Manini Beach over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Sep 16) at 8PM. The primary swell is predicted to be 0.7m and 18s period with a secondary swell of 0.2m and 11s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Manini Beach in the next 16 days are 0.9m 17s and forecast to arrive on Friday (Sep 18) 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 0.3m 6s period and expected on Tuesday (Sep 22) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Wed 16th Sep) | 2.5ft (0.7m) 18s |
| Best Surf | 2AM (Fri 18th Sep) | 3ft (0.9m) 17s |
| Most Powerful | 2AM (Fri 18th Sep) | 3ft (0.9m) 17s |
Table - best surf conditions forecast for Manini Beach over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s get straight into it, yeah? Things are looking pretty quiet for Manini Beach over the next two weeks. Not much in the way of proper swell to get excited about, but there are a couple of windows where the conditions could come together for a sneaky session.
We kick off right away on Wednesday the 16th with a small 2ft south-west swell rolling in. It's packing some serious grunt for its size, with that very long period of 18 seconds and combined energy of 343 (moderate). The wind’s light and onshore first thing, so it’s not clean, but it’s surfable. The water temp is right where you’d expect for this time of year, no weird anomalies.
Thursday the 17th sees the same size swell, but the period drops a touch to 16 seconds and the energy picks up to 500 (moderate). Winds stay cross-onshore, keeping it a bit bumpy. Friday the 18th is more of the same story – 2ft swell from the south-west, 17-second period, energy at 458 (moderate), but again, that light cross-onshore breeze messes with the surface.
Saturday the 19th, we get a slight shift. Swell drops to 2ft from the south, period is a very long 18 seconds, and energy is 450 (moderate). The wind is light cross-onshore in the morning, so it’s not perfect but there’s potential for a wave or two if you’re keen.
Now here’s where it gets interesting. Monday the 21st is the standout. Monday afternoon is your best bet in the whole forecast. The swell is still small at 3ft from the south-south-west, period is 13 seconds, energy is 275 (moderate), but the wind goes glassy. Absolutely flat calm. That’s the gold right there. Just tiny, clean little peelers on the reef for a beginner-friendly session with no hassle. Crowds are ‘sometimes’, so you might have company, but with such small waves, it won’t be a zoo.
Tuesday the 22nd is similar. Swell drops to 2ft from the south, period 12 seconds, energy 200 and 233 (moderate), and again, glassy conditions both morning and afternoon. Another lovely window for a small-board grovel session. Wednesday the 23rd morning stays glassy with a 2ft south swell, 13-second period, energy 255 (moderate). But the afternoon gets absolutely hammered by a near gale – avoid that.
After that, the surf quality takes a dive. Thursday the 24th morning is glassy again with 2ft, but the wind goes bad in the afternoon and stays rubbish for days. A moderate breeze from the south-south-west kicks up a cross-chop from the 25th right through to the 27th. The swell does nudge up to 3ft on Saturday the 26th, but with that wind, it’s messy and uninviting.
The final few days of September into October 1st are a write-off. Tiny 2ft to 2ft swell, weak energy, and either onshore winds or just no power.
So there you have it. It’s not a pumping fortnight by any stretch. The real highlights are Monday the 21st afternoon, through to Wednesday the 23rd morning – glassy conditions with tiny, clean waves. Perfect for a beginner or someone wanting a mellow paddle. The rest is mostly a bust, with a solid run of poor surf from the 25th to the 1st of October. Keep your eyes peeled, though – forecasts can always flick a surprise.
Rusty.
Short Range ForecastHeavy rain (total 22mm), heaviest during Thu afternoon. Warm (max 29°C on Wed morning, min 27°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Fri night. Warm (max 28°C on Sat morning, min 26°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | ||||||||||||||
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) | SW 19 | SW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SSW 17 | SW 17 | SW 17 | SSW 15 | S 18 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 13 | SSW 13 | SSW 13 |
Wave Graph | |||||||||||||||||||
372 | 319 | 316 | 298 | 251 | 261 | 475 | 305 | 298 | 270 | 225 | 371 | 346 | 292 | 288 | 265 | 239 | 232 | 173 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | glassy | cross-on | cross-on | glassy | cross-on | cross-on | glassy | cross-on | cross-on | cross | on | cross-on | glassy | on | glassy | glassy |
High Tide | 7:31AM0.54m | 5:38PM0.35m | 8:42AM0.51m | 10:29AM0.49m | 12:01PM0.51m | 11:05PM0.24m | 12:53PM0.55m | 00:32AM0.28m | 1:28PM0.58m | 1:13AM0.34m | |||||||||
Low Tide | 00:03AM0.05m | 1:50PM0.25m | 00:30AM0.07m | 1:08AM0.10m | 2:34AM0.13m | 8:36PM0.19m | 8:09PM0.17m | 6:08AM0.10m | 8:14PM0.15m | ||||||||||
— | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | |
6:25 | — | 6:24 | — | — | 6:23 | — | — | 6:22 | — | — | 6:22 | — | — | 6:21 | — | — | 6:20 | — | |
mm | 1 | — | 1 | — | — | 5 | 7 | 2 | 6 | 5 | — | — | — | — | — | — | — | 1 | — |
Temp °C | 27 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 28 |
Feels °C | 32 | 32 | 33 | 33 | 32 | 31 | 33 | 32 | 32 | 31 | 32 | 31 | 31 | 31 | 32 | 31 | 31 | 32 | 33 |
Swell 1 Height (m) Direction Period (s) | SW 19 | SW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SSW 17 | SW 17 | SW 17 | SSW 15 | S 18 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 13 | SSW 13 | SSW 13 |
372 | 319 | 316 | 298 | 251 | 261 | 475 | 305 | 298 | 270 | 225 | 371 | 346 | 292 | 288 | 265 | 239 | 232 | 173 | |
Swell 2 Height (m) Direction Period (s) | SW 12 | SSW 12 | SSW 11 | SSW 11 | SSW 19 | S 18 | WSW 8 | S 16 | SSW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 14 | WNW 12 | SW 14 | SW 14 |
23 | 13 | 12 | 12 | 212 | 169 | 14 | 137 | 211 | 129 | 124 | 122 | 79 | 54 | 54 | 54 | 14 | 31 | 29 | |
Swell 3 Height (m) Direction Period (s) | SW 8 | WSW 8 | W 8 | W 8 | SSW 19 | WSW 8 | SSW 18 | WSW 9 | S 11 | SSE 6 | SSW 15 | W 9 | S 10 | W 13 | W 13 | WNW 12 | SSW 15 | WNW 11 | WNW 11 |
11 | 7 | 5 | 12 | 37 | 7 | 61 | 16 | 2 | 4 | 86 | 6 | 2 | 4 | 3 | 14 | 21 | 12 | 24 | |
Wind waves Height (m) Direction Period (s) | — | WSW 7 | — | — | — | WNW 8 | — | — | W 9 | WSW 9 | WSW 9 | SSW 6 | W 8 | WSW 8 | WSW 3 | — | — | — | NW 2 |
— | 4 | — | — | — | 13 | — | — | 26 | 16 | 15 | 4 | 12 | 14 | 3 | — | — | — | 2 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 62 | 62 | 23 | 0 | 93 | 19 | 0 | 62 | 38 | 0 | 38 | 62 | 13 | 38 | 38 | 0 | 38 | 0 | 0 |
Best forecast wave conditions in Big Island | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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Information about the Manini Beach Surf forecast
The above surf forecast table for Manini Beach provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Manini Beach can be found by selecting the local surf guide option on the grey menu. Our Manini Beach 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 (Manini Beach) 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 Manini Beach 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.
Manini Beach is 92 km (57 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.










