
Surf Forecasts:
Ammonias surf forecast from 7 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 2AM (local time) - 20ft (6.0m), 13s period, SSW swell with cross-onshore winds.
- Most powerful swell: Tuesday 8 Sep, 2AM (local time) - 20ft (6.0m), 13s period, SSW swell with 13,576 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 2AM (local time) - 20ft (6.0m), 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 Tuesday (Sep 08) at 2AM. The primary swell is predicted to be 6.0m and 13s period with a secondary swell of 2.2m and 12s. Another secondary swell of 2.2m and 12s is also forecast. The wind is predicted to be cross-onshore as the swell arrives.
The most powerful waves expected at Ammonias in the next 16 days are 6.0m 13s and forecast to arrive on Tuesday (Sep 08) at 2AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 9s period and expected on Tuesday (Sep 08) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Tue 8th Sep) | 20ft (6.0m) 13s |
| Best Surf | 2AM (Tue 8th Sep) | 20ft (6.0m) 13s |
| Most Powerful | 2AM (Tue 8th Sep) | 20ft (6.0m) 13s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s cookin’ at Ammonias over the next couple of weeks.
Honestly, I gotta be straight with you – this outlook is a tough one. For a solid ten days, starting right now, we're just not seeing any decent surf. The wind is a mess, mostly cross or cross-onshore, and the swell is all over the place with poor conditions. It’s a real bummer, but it happens. The wait will be worth it for patient souls.
Now, let’s talk about the one true standout. It’s not a full-on classic, but it’s the best we’ve got. Look to Wednesday morning, September 9th. The swell drops to a clean 3 ft from the SSW, and the period jumps to a very long 14 seconds. That’s proper groundswell energy. The combined energy is a modest 642, but the real kicker is the wind. We’ve got light offshore winds from the SSE, which will make for the cleanest, glassiest conditions we’ll see in this whole window. The water temperature is 81°, which is about normal for this time of year.
The crowd situation at Ammonias is something to note – it’s a spot that can get crowded often, so if you’re out there on that Wednesday morning, expect some company. It’s a reef break, fairly consistent, and this SSW swell direction is the optimum for the break. The 3 ft size is perfect for intermediates, and the long period will give those waves some real shape. Just keep in mind that on a reef, that long period can make things a bit more lined up and critical.
After that Wednesday morning window, the wind starts to shift back onshore, and the swell goes back to being messy and small. We get a few more marginal sessions, but nothing that’s a green light. The energy levels drop way down into the 100-400 range, and the wind is just never on our side. For the rest of the second week, it’s a waiting game.
So, there you have it. One good morning, and a whole lot of patience. Keep your eyes on the charts, you never know when it might turn.
Rusty.
Short Range ForecastHeavy rain (total 65mm), heaviest during Mon morning. Warm (max 27°C on Tue morning, min 24°C on Sun night). Winds decreasing (near gales from the SE on Mon night, light winds from the SSW by Tue night). | Days 4-6 Weather SummaryLight rain (total 5mm), mostly falling on Wed night. Warm (max 27°C on Wed morning, min 24°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | |||||||||||||||
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) | ENE 13 | ENE 12 | E 12 | ENE 7 | SSW 13 | SSW 13 | SSW 9 | ENE 11 | ENE 10 | SSW 14 | SSW 13 | SSW 13 | ENE 7 | ENE 7 | ENE 7 | SSW 16 | SSW 15 | ENE 11 | ENE 8 | ENE 10 | ENE 10 |
Wave Graph | |||||||||||||||||||||
1423 | 1392 | 1513 | 774 | 1834 | 13576 | 963 | 771 | 464 | 336 | 253 | 178 | 261 | 261 | 225 | 164 | 150 | 452 | 226 | 428 | 325 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross | cross | cross-on | cross | cross |
High Tide | 12:57PM0.68m | 00:45AM0.25m | 1:42PM0.69m | 1:36AM0.30m | 2:20PM0.68m | 2:21AM0.36m | 2:54PM0.66m | 3:04AM0.41m | 3:24PM0.61m | 3:47AM0.47m | 3:51PM0.55m | 4:29AM0.51m | 4:16PM0.48m | ||||||||
Low Tide | 8:30PM0.15m | 6:02AM0.04m | 8:46PM0.13m | 7:02AM0.02m | 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 | ||||||||
6:20 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | |
— | 6:49 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | |
mm | 1 | 2 | 23 | 14 | 7 | 14 | 3 | 1 | — | — | — | 3 | — | 2 | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 25 | 25 | 26 | 26 | 27 | 27 | 26 | 27 | 27 | 27 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 26 | 25 | 24 | 24 | 25 | 22 | 27 | 27 | 29 | 30 | 30 | 31 | 27 | 27 | 25 | 26 | 25 | 25 | 26 | 26 | 25 |
Swell 1 Height (m) Direction Period (s) | SSW 12 | SSW 12 | SSW 13 | SSW 12 | SSW 13 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 9 | ENE 8 | ENE 8 | SSW 13 | SSW 13 | SSW 16 | E 12 | ENE 12 | SSW 15 | SSW 16 | SSW 16 | NE 8 |
486 | 718 | 1294 | 774 | 1834 | 1347 | 917 | 771 | 464 | 237 | 177 | 149 | 186 | 127 | 175 | 141 | 142 | 283 | 99 | 99 | 35 | |
Swell 2 Height (m) Direction Period (s) | SSW 16 | SSE 10 | S 18 | SSE 8 | SSW 16 | ENE 12 | W 9 | SSW 8 | S 8 | SSW 14 | SSW 13 | SSW 13 | E 12 | E 12 | E 12 | SSW 16 | SSW 15 | SE 8 | SSW 13 | SSW 13 | SSW 13 |
382 | 38 | 332 | 164 | 437 | 1347 | 495 | 402 | 167 | 336 | 253 | 178 | 108 | 104 | 103 | 164 | 150 | 18 | 70 | 69 | 67 | |
Swell 3 Height (m) Direction Period (s) | SSE 10 | SSW 19 | SSE 10 | SSW 17 | NW 13 | NNW 12 | SE 8 | W 8 | SSW 14 | S 7 | E 13 | E 13 | SW 17 | SW 18 | SSW 12 | SW 9 | SE 9 | SW 8 | SE 8 | SE 8 | SW 16 |
36 | 122 | 38 | 492 | 7 | 14 | 141 | 191 | 356 | 69 | 168 | 161 | 138 | 154 | 81 | 41 | 39 | 18 | 17 | 17 | 64 | |
Wind waves Height (m) Direction Period (s) | ENE 13 | ENE 12 | E 12 | ENE 7 | E 8 | SSW 13 | SSW 9 | — | — | — | — | — | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 11 | ENE 8 | ENE 10 | ENE 10 |
1423 | 1392 | 1513 | 756 | 1434 | 13576 | 963 | — | — | — | — | — | 261 | 261 | 225 | 144 | 142 | 452 | 226 | 428 | 325 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 33 | 118 | 301 | 231 | 249 | 32 | 23 | 11 | 23 | 16 | 12 | 31 | 33 | 16 | 31 | 16 | 16 | 31 | 16 | 16 |
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










