
Surf Forecasts:
Ammonias surf forecast from 9 Sep 2026:
- Best quality surf: Wednesday 9 Sep, 8PM (local time) - 3ft (0.9m), 13s period, SSW swell with glassy winds.
- Most powerful swell: Tuesday 15 Sep, 11PM (local time) - 2.5ft (0.8m), 19s period, SSW swell with 475 kJ wave energy.
- Next surfable swell (1★+): Wednesday 9 Sep, 8PM (local time) - 3ft (0.9m), 13s period with SSW swell.
Best Forecast Surf Conditions for Ammonias this week:
The surf forecast for Ammonias over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Sep 09) at 8PM. The primary swell is predicted to be 0.9m and 13s period with a secondary swell of 1.0m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Ammonias in the next 16 days are 0.8m 19s and forecast to arrive on Tuesday (Sep 15) at 11PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 8s period and expected on Monday (Sep 14) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Wed 9th Sep) | 3ft (0.9m) 13s |
| Best Surf | 8PM (Wed 9th Sep) | 3ft (0.9m) 13s |
| Most Powerful | 11PM (Tue 15th Sep) | 2.5ft (0.8m) 19s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright, let’s get this straight.
Honestly, the next couple of weeks are looking pretty frustrating for us. We’ve got a real dry spell on the horizon, with most days serving up junky, cross-onshore wind and small, weak swell. If you’re itching to get wet, you’ll need to pick your moments, and even then, it’s going to be a grind for anything half-decent.
The first real window of opportunity looks like it will be on the morning of Wednesday the 18th. The swell is still small, around 3ft, but it’s from the SSW and carrying a solid 17-second period. That’s proper groundswell energy, clocking in at 1216 on the energy scale, which is the strongest we’ll see in the whole run. The wind is cross-shore from the ENE at 25 km/h, which is a bit of a shame, but the wave quality should be there. Ammonias is a reef break, so it can handle that direction better than a beachie. It’s a fairly consistent spot, so there should be sets rolling through, but you’ll be sharing it with a few others – it’s often got a crew on it.
The other day that could offer a glimmer of hope is the morning of Friday the 20th. The swell bumps up to 6ft from the E with a short 8-second period. That’s a lot of windswell, and with a cross-on wind from the E, it’s going to be a bit of a chaotic mess. Honestly, that’s probably more interesting for the kite surfers than us paddle surfers. The energy is high at 565, but the quality just won't be there.
To be honest, the rest of the time, we’re looking at a lot of nothing. There are gaps of three to four days where I wouldn’t even bother paddling out. The swell direction is mostly ENE, which isn't the optimum SSE for this spot, and the winds just keep messing it up. It’s a classic case of the ocean just not cooperating.
So, keep your board in the car, but don’t get your hopes up. The standout is that Wednesday morning session, it’s our best chance at a real wave. It’s a long-range call, so it’s promising but not set in stone just yet.
Talk soon.
Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Thu afternoon. Warm (max 27°C on Wed morning, min 24°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Sat morning, min 24°C on Fri night). Wind will be generally light. | ||||||||||||||||||
Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 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) | ENE 11 | SSW 14 | SSW 13 | SSW 13 | ENE 8 | ENE 7 | ENE 7 | SW 16 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | SSW 13 | SW 15 | SSW 14 | SSW 14 | SW 14 | SW 22 | SW 21 |
Wave Graph | |||||||||||||||||||
560 | 336 | 253 | 178 | 215 | 314 | 212 | 198 | 314 | 436 | 173 | 135 | 98 | 104 | 82 | 134 | 49 | 227 | 224 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | on | cross-off | cross-on | cross-on | cross | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross | cross |
High Tide | 2:21AM0.36m | 2:54PM0.66m | 3:04AM0.41m | 3:24PM0.61m | 3:47AM0.47m | 3:51PM0.55m | 4:29AM0.51m | 4:16PM0.48m | 5:11AM0.54m | 4:38PM0.41m | 5:56AM0.55m | 4:55PM0.35m | |||||||
Low Tide | 9:05PM0.11m | 7:55AM0.03m | 9:25PM0.09m | 8:43AM0.05m | 9:45PM0.07m | 9:31AM0.09m | 10:06PM0.05m | 10:19AM0.13m | 10:28PM0.04m | 11:10AM0.18m | 10:50PM0.04m | 12:08PM0.22m | 11:14PM0.05m | ||||||
— | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | |
6:46 | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — | |
mm | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 27 | 27 | 26 | 27 | 26 | 25 | 26 | 26 | 25 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 26 | 25 |
Feels °C | 28 | 30 | 29 | 30 | 29 | 27 | 26 | 26 | 26 | 26 | 27 | 26 | 26 | 27 | 25 | 25 | 27 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | ENE 11 | ENE 10 | ENE 9 | ENE 8 | SSW 13 | SSW 12 | SW 16 | SW 16 | NE 8 | SW 15 | ENE 10 | ENE 10 | NE 9 | NE 9 | NE 9 | NE 9 | NE 8 | SW 22 | SW 21 |
560 | 264 | 165 | 136 | 173 | 172 | 211 | 198 | 57 | 223 | 173 | 135 | 112 | 112 | 91 | 95 | 102 | 227 | 224 | |
Swell 2 Height (m) Direction Period (s) | S 8 | SSW 14 | SSW 13 | SSW 13 | E 12 | E 12 | SSW 12 | E 11 | SW 15 | SE 8 | NE 8 | NE 9 | ENE 9 | ENE 9 | E 9 | SSW 14 | SE 8 | SE 8 | SSW 13 |
182 | 336 | 253 | 178 | 108 | 104 | 81 | 91 | 229 | 18 | 70 | 81 | 90 | 64 | 57 | 134 | 24 | 16 | 67 | |
Swell 3 Height (m) Direction Period (s) | SSW 14 | S 8 | NW 9 | E 13 | SSW 17 | SW 18 | E 12 | SSW 12 | SSW 12 | SSW 11 | SW 16 | SSW 16 | SSW 13 | SW 15 | SSW 14 | SE 9 | SW 14 | SW 14 | SE 8 |
431 | 74 | 70 | 119 | 186 | 154 | 99 | 79 | 45 | 23 | 124 | 99 | 98 | 104 | 82 | 27 | 49 | 47 | 15 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 11 | ENE 11 | — | — | SE 5 | — | — | ENE 5 | ENE 5 | NE 8 | ENE 8 |
— | — | — | — | 215 | 314 | 212 | 158 | 314 | 436 | — | — | 3 | — | — | 40 | 25 | 138 | 117 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 11 | 11 | 33 | 0 | 31 | 31 | 16 | 31 | 31 | 16 | 14 | 12 | 31 | 12 | 12 | 10 | 31 | 31 | 14 |
Best forecast wave conditions in Kaua'i | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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Information about the Ammonias Surf forecast
The above surf forecast table for Ammonias provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Ammonias can be found by selecting the local surf guide option on the grey menu. Our Ammonias 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 (Ammonias) 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 Ammonias 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.
Are you planning a vacation in Kaua'i? If you are looking for accommodation near Ammonias, camping, hotels and condos and appartments in Kaua'i, consider staying in Nawiliwili which is 2 km (1 miles) away. Alternatively, find information about places to stay and car hire in Lihue - Kauai which is 3 km (2 miles) away










