Surf Forecasts:
Ammonias surf forecast from 8 Sep 2026:
- Best quality surf: Monday 7 Sep, 8PM (local time) - 18ft (5.5m), 16s period, SSW swell with onshore winds.
- Most powerful swell: Monday 7 Sep, 11PM (local time) - 31ft (9.5m), 15s period, S swell with 37,666 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 8PM (local time) - 18ft (5.5m), 16s 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 Monday (Sep 07) at 8PM. The primary swell is predicted to be 5.5m and 16s period with a secondary swell of 5.5m and 9s. The wind is predicted to be onshore as the swell arrives.
The most powerful waves expected at Ammonias in the next 16 days are 9.5m 15s and forecast to arrive on Monday (Sep 07) at 11PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 8s period and expected on Monday (Sep 14) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Mon 7th Sep) | 18ft (5.5m) 16s |
| Best Surf | 8PM (Mon 7th Sep) | 18ft (5.5m) 16s |
| Most Powerful | 11PM (Mon 7th Sep) | 31ft (9.5m) 15s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright, I'm Rusty, and I'm not gonna sugarcoat it. The next sixteen days at Ammonias are a tough watch. The surf forecast is lean, real lean.
We're in for a dry spell. The first week kicks off on Monday 7th September with a total washout. A 10ft SSW swell is pumping with huge energy, but a 31 mph onshore wind is gonna turn it into a complete mess. It's a write-off, and the blown-out, choppy vibes just keep rolling through the first week.
If you're looking for a silver lining, it's right at the very end. The best – and pretty much only – chance for a surf is on the afternoon of Tuesday 22nd September. The wind goes glassy, dead calm. The swell is only about 2ft from the SSW, with a long 13-second period and moderate energy. It's going to be clean and small, so grab a log or a groveler. It's not a standout for power, but it's a standout for actually being surfable.
The water temp is a normal 81°F for this time of year.
Honestly, with the wind and chop we've got for most of the run, this spot might be better for the kite surfers than the paddle crew.
The rest of the two weeks is pretty much a ghost town. Hang tight, the forecasts can always turn around.
Rusty.
Short Range ForecastHeavy rain (total 46mm), heaviest during Mon night. Warm (max 28°C on Wed afternoon, min 25°C on Tue night). Winds decreasing (severe gales from the SSE on Mon night, light winds from the SSW by Wed morning). | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Thu afternoon. Warm (max 26°C on Thu afternoon, min 24°C on Sat night). Wind will be generally light. | |||||||||||||||||||
Mon 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | ||||||||||||||
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) | SSW 15 | SSW 13 | SW 9 | ENE 11 | ENE 11 | SSW 14 | SSW 13 | SSW 13 | ENE 8 | ENE 7 | ENE 7 | SW 16 | SW 15 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | SSW 14 |
Wave Graph  | ||||||||||||||||||||
 kJ | 4394 | 23232 | 1927 | 771 | 521 | 336 | 253 | 178 | 244 | 268 | 231 | 198 | 229 | 379 | 173 | 128 | 123 | 119 | 110 | 79 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross | cross-on | on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross |
High Tide | 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 | 5:11AM0.54m | 4:38PM0.41m | ||||||||
Low Tide | 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 | 11:10AM0.18m | 10:50PM0.04m | |||||||
 |  |  |  |  | | | | | |  | | | | | | | | | | |
 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — |
 | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — |
mm | 11 | 33 | 2 | — | — | — | — | — | — | 2 | 1 | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 26 | 27 | 26 | 27 | 28 | 26 | 27 | 26 | 25 | 26 | 26 | 25 | 26 | 25 | 25 | 26 | 26 | 25 |
Feels °C | 23 | 18 | 24 | 27 | 28 | 30 | 31 | 30 | 29 | 28 | 26 | 27 | 27 | 26 | 28 | 27 | 26 | 27 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | SSW 15 | ENE 10 | ENE 11 | ENE 11 | ENE 11 | ENE 10 | ENE 9 | ENE 8 | SSW 13 | SSW 12 | SW 16 | SW 16 | SW 15 | SW 15 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | NE 8 |
| kJ | 4394 | 920 | 814 | 771 | 521 | 258 | 165 | 103 | 173 | 175 | 211 | 198 | 229 | 226 | 173 | 128 | 123 | 119 | 110 | 58 |
Swell 2 Height (m) Direction Period (s) | NNW 13 | NNW 12 | SSW 15 | SSW 14 | SSW 8 | SSW 14 | SSW 13 | SSW 13 | E 12 | E 12 | E 12 | E 11 | ENE 11 | SSW 11 | NNE 8 | NE 9 | NE 9 | NE 8 | NE 8 | SSW 14 |
| kJ | 17 | 14 | 494 | 449 | 232 | 336 | 253 | 178 | 108 | 104 | 99 | 91 | 97 | 40 | 45 | 81 | 81 | 74 | 57 | 79 |
Swell 3 Height (m) Direction Period (s) | — | — | SW 20 | NW 9 | SSW 14 | SSW 8 | S 7 | E 13 | SSW 17 | SW 18 | SSW 12 | S 12 | NNE 8 | SE 8 | SW 16 | SSW 16 | SSW 13 | SSW 15 | SSW 15 | ENE 9 |
| kJ | — | — | 15 | 83 | 431 | 96 | 40 | 119 | 186 | 154 | 82 | 71 | 23 | 18 | 124 | 99 | 98 | 84 | 84 | 26 |
Wind waves Height (m) Direction Period (s) | E 8 | SSW 13 | SW 9 | SSW 8 | — | — | — | — | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 11 | — | — | — | — | E 5 | E 4 |
| kJ | 2248 | 23232 | 1927 | 705 | — | — | — | — | 244 | 268 | 231 | 158 | 93 | 379 | — | — | — | — | 20 | 20 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 296 | 300 | 34 | 23 | 11 | 11 | 33 | 10 | 14 | 31 | 16 | 31 | 14 | 14 | 14 | 14 | 16 | 31 | 31 | 16 |
Best forecast wave conditions in Kaua'i | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Ammonias surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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
Nearest