Surf Forecasts:
Ammonias surf forecast from 3 Sep 2026:
- Best quality surf: Monday 7 Sep, 8PM (local time) - 21ft (6.5m), 15s period, S swell with cross-onshore winds.
- Most powerful swell: Monday 7 Sep, 11PM (local time) - 25ft (7.5m), 14s period, SSE swell with 19,619 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 8PM (local time) - 21ft (6.5m), 15s period with S 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 6.5m and 15s period with a secondary swell of 8.5m and 11s. 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 7.5m 14s 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 3.5m 8s period and expected on Tuesday (Sep 08) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Mon 7th Sep) | 21ft (6.5m) 15s |
| Best Surf | 8PM (Mon 7th Sep) | 21ft (6.5m) 15s |
| Most Powerful | 11PM (Mon 7th Sep) | 25ft (7.5m) 14s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
Short Range ForecastLight rain (total 4mm), mostly falling on Wed night. Warm (max 26°C on Thu morning, min 24°C on Thu night). Mainly fresh winds. | Days 5-7 Weather SummaryHeavy rain (total 87mm), heaviest during Mon night. Warm (max 27°C on Sun afternoon, min 23°C on Sun night). Winds decreasing (severe gales from the SE on Mon night, moderate winds from the SW by Tue afternoon). | ||||||||||||||||||
Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | ||||||||||||||
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 8 | ENE 8 | SE 12 | ENE 7 | SSE 12 | SSE 12 | E 14 | E 14 | ENE 14 | S 13 | ENE 13 | S 14 | S 14 | S 14 | S 15 | WSW 8 | ENE 11 | ENE 10 | S 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 507 | 480 | 549 | 420 | 428 | 454 | 405 | 561 | 1856 | 900 | 2103 | 2006 | 3424 | 4313 | 9377 | 2810 | 705 | 388 | 198 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross | cross-on | cross-on | cross | cross | cross |
High Tide | 9:35AM0.57m | 10:57AM0.61m | 12:04PM0.65m | 11:37PM0.20m | 12:57PM0.68m | 00:45AM0.25m | 1:42PM0.69m | 1:36AM0.30m | 2:20PM0.68m | 2:21AM0.36m | |||||||||
Low Tide | 1:01AM0.04m | 2:01AM0.05m | 3:24AM0.06m | 8:23PM0.17m | 8:30PM0.15m | 6:02AM0.04m | 8:46PM0.13m | 7:02AM0.02m | 9:05PM0.11m | ||||||||||
 |  | |  |  |  |  | | | | |  |  |  |  | | | | | |
 | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — |
 | 6:52 | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — |
mm | 2 | — | — | — | 1 | — | — | — | 1 | 3 | 2 | — | 13 | 16 | 7 | 44 | 2 | — | — |
Temp °C | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 27 | 25 | 23 | 25 | 26 | 26 | 27 | 26 |
Feels °C | 25 | 25 | 24 | 24 | 23 | 23 | 23 | 25 | 25 | 24 | 25 | 26 | 24 | 21 | 22 | 16 | 25 | 27 | 28 |
Swell 1 Height (m) Direction Period (s) | S 15 | SE 13 | SE 12 | SE 11 | SSE 12 | SSE 12 | SSE 11 | SSE 12 | S 12 | S 13 | S 13 | S 14 | S 14 | S 14 | S 15 | ENE 11 | ENE 11 | ENE 10 | S 9 |
| kJ | 352 | 480 | 549 | 273 | 385 | 454 | 383 | 560 | 650 | 900 | 1561 | 2006 | 3424 | 4313 | 9377 | 2241 | 705 | 388 | 198 |
Swell 2 Height (m) Direction Period (s) | SE 13 | S 14 | S 14 | S 13 | E 14 | E 14 | E 14 | E 14 | SSW 18 | E 14 | SE 10 | N 10 | — | NNW 14 | NNW 13 | S 11 | SSE 9 | S 9 | NNW 9 |
| kJ | 176 | 268 | 246 | 176 | 196 | 289 | 401 | 561 | 121 | 820 | 25 | 8 | — | 20 | 17 | 953 | 409 | 275 | 176 |
Swell 3 Height (m) Direction Period (s) | S 11 | E 13 | E 13 | E 12 | S 13 | SSW 13 | SSW 20 | SSW 18 | NNE 10 | SSW 16 | SE 10 | N 10 | — | — | — | SE 10 | NNW 9 | NNW 9 | ENE 9 |
| kJ | 61 | 85 | 80 | 109 | 92 | 34 | 37 | 121 | 18 | 149 | 25 | 8 | — | — | — | 546 | 289 | 202 | 188 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 14 | ENE 7 | ENE 13 | ENE 13 | ENE 7 | ENE 8 | ENE 9 | WSW 8 | W 6 | W 5 | — |
| kJ | 507 | 477 | 358 | 420 | 428 | 376 | 405 | 353 | 1856 | 282 | 2103 | 1659 | 697 | 1082 | 4831 | 2810 | 166 | 50 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 16 | 33 | 38 | 118 | 31 | 296 | 320 | 23 | 17 | 11 |
Best forecast wave conditions in Kaua'i | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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
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