Surf Forecasts:
Ammonias surf forecast from 14 Aug 2026:
- Most powerful swell: Sunday 16 Aug, 5AM (local time) - 11ft (3.5m), 9s period, E swell with 1,918 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 3.5m 9s and forecast to arrive on Sunday (Aug 16) at 5AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 7s period and expected on Wednesday (Aug 19) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Sun 16th Aug) | 11ft (3.5m) 9s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
Short Range ForecastLight rain (total 8mm), mostly falling on Fri night. Warm (max 27°C on Thu morning, min 25°C on Thu night). Mainly fresh winds. | Days 4-6 Weather SummaryModerate rain (total 16mm), heaviest on Sun night. Warm (max 26°C on Sun afternoon, min 24°C on Mon night). Mainly fresh winds. | ||||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | |||||||||||||||
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) | S 16 | S 15 | S 15 | S 14 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | E 9 | E 9 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | S 14 | ENE 7 | ENE 7 | S 13 | ENE 7 | ENE 7 | SW 16 |
Wave Graph | |||||||||||||||||||||
1004 | 784 | 743 | 598 | 496 | 570 | 979 | 1162 | 1787 | 1787 | 1565 | 725 | 438 | 314 | 232 | 165 | 154 | 112 | 128 | 127 | 130 | |
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-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross | cross |
High Tide | 4:34PM0.66m | 4:44AM0.37m | 5:03PM0.59m | 5:36AM0.41m | 5:29PM0.52m | 6:32AM0.43m | 5:50PM0.44m | 7:34AM0.46m | 6:01PM0.36m | 8:46AM0.48m | 5:31PM0.30m | 10:06AM0.50m | |||||||||
Low Tide | 9:30AM-0.00m | 11:09PM0.08m | 10:17AM0.05m | 11:35PM0.07m | 11:06AM0.12m | 00:00AM0.06m | 12:01PM0.20m | 00:26AM0.06m | 1:11PM0.26m | 00:55AM0.06m | 3:13PM0.30m | 1:28AM0.08m | 2:14AM0.09m | ||||||||
6:13 | — | — | 6:13 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | |
— | 7:08 | — | — | 7:08 | — | — | 7:07 | — | — | 7:07 | — | — | 7:06 | — | — | 7:06 | — | — | 7:05 | — | |
mm | — | — | — | — | — | 1 | 1 | 2 | 4 | 2 | 4 | 7 | 3 | — | — | — | — | — | — | — | — |
Temp °C | 27 | 27 | 25 | 26 | 27 | 26 | 26 | 26 | 26 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 26 | 25 | 25 | 25 | 25 | 25 | 26 | 25 | 25 | 24 | 25 | 24 | 25 | 26 | 25 | 26 | 26 | 26 | 27 | 26 | 25 |
Swell 1 Height (m) Direction Period (s) | S 16 | S 15 | S 15 | S 14 | S 14 | S 14 | S 13 | S 13 | S 13 | SE 12 | SE 11 | SSE 8 | SSE 7 | S 12 | S 14 | S 13 | S 13 | S 13 | SSE 10 | SSE 10 | E 8 |
1004 | 784 | 743 | 598 | 496 | 394 | 280 | 219 | 222 | 473 | 1027 | 323 | 77 | 150 | 232 | 165 | 121 | 112 | 64 | 60 | 61 | |
Swell 2 Height (m) Direction Period (s) | W 12 | W 11 | W 12 | W 12 | SE 12 | SE 13 | W 13 | S 16 | S 18 | S 12 | S 16 | S 13 | S 14 | SSE 7 | SSE 6 | SSE 9 | SSE 9 | SSE 6 | S 12 | S 12 | SE 9 |
25 | 23 | 10 | 11 | 21 | 26 | 29 | 46 | 98 | 150 | 129 | 167 | 268 | 38 | 15 | 49 | 53 | 28 | 69 | 69 | 41 | |
Swell 3 Height (m) Direction Period (s) | SW 19 | SE 10 | SSE 10 | SE 12 | W 11 | W 11 | SE 12 | SE 13 | WNW 12 | S 17 | S 13 | S 16 | SE 11 | S 15 | SE 11 | SW 17 | SW 18 | WNW 12 | SSW 16 | SSW 16 | SW 16 |
14 | 14 | 9 | 23 | 22 | 21 | 21 | 26 | 49 | 142 | 82 | 181 | 30 | 150 | 29 | 76 | 80 | 28 | 103 | 103 | 130 | |
Wind waves Height (m) Direction Period (s) | ENE 6 | ENE 6 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | E 9 | E 9 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 7 | NE 7 |
194 | 183 | 350 | 469 | 460 | 570 | 979 | 1162 | 1787 | 1787 | 1565 | 725 | 438 | 314 | 214 | 163 | 154 | 90 | 128 | 127 | 65 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 31 | 16 | 31 | 31 | 31 | 31 | 31 | 31 | 303 | 126 | 126 | 126 | 126 | 16 | 31 | 16 | 16 | 31 | 31 | 16 |
Best forecast wave conditions in Kaua'i | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
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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











