Surf Forecasts:
Ammonias surf forecast from 18 Oct 2026:
- Best quality surf: Friday 23 Oct, 5AM (local time) - 4ft (1.2m), 8s period, ENE swell with cross-offshore winds.
- Most powerful swell: Tuesday 20 Oct, 2AM (local time) - 8ft (2.4m), 8s period, ENE swell with 707 kJ wave energy.
- Next surfable swell (1★+): Friday 23 Oct, 5AM (local time) - 4ft (1.2m), 8s period with ENE 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 Friday (Oct 23) at 5AM. The primary swell is predicted to be 1.2m and 8s period with a secondary swell of 0.4m and 7s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Ammonias in the next 16 days are 2.4m 8s and forecast to arrive on Tuesday (Oct 20) 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 0.9m 12s period and expected on Saturday (Oct 24) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Fri 23rd Oct) | 4ft (1.2m) 8s |
| Best Surf | 5AM (Fri 23rd Oct) | 4ft (1.2m) 8s |
| Most Powerful | 2AM (Tue 20th Oct) | 8ft (2.4m) 8s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
Short Range ForecastModerate rain (total 17mm), heaviest on Sun morning. Warm (max 26°C on Sun morning, min 24°C on Sun night). Mainly fresh winds. | Days 4-6 Weather SummaryModerate rain (total 11mm), heaviest on Wed night. Warm (max 26°C on Wed morning, min 23°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Sunday 18 | Monday 19 | Tuesday 20 | Wednesday 21 | Thursday 22 | Friday 23 | Saturday 24 | |||||||||||||||
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 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | SSW 13 | ENE 8 | S 18 | SSW 15 | SSW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 417 | 366 | 623 | 671 | 536 | 707 | 462 | 570 | 605 | 437 | 395 | 303 | 215 | 187 | 192 | 153 | 135 | 137 | 156 | 222 | 283 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-on | cross | cross | cross-on | cross-on | cross | cross-on | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross-off | cross | cross-off | cross-off |
High Tide | 10:27AM0.54m | 11:33PM0.23m | 11:20AM0.54m | 00:18AM0.28m | 12:01PM0.53m | 00:54AM0.34m | 12:35PM0.52m | 1:29AM0.42m | 1:04PM0.50m | 2:03AM0.49m | 1:33PM0.46m | 2:39AM0.57m | 2:03PM0.42m | 3:16AM0.64m | |||||||
Low Tide | 6:57PM0.17m | 3:13AM0.19m | 6:54PM0.16m | 4:43AM0.19m | 7:00PM0.13m | 5:53AM0.19m | 7:12PM0.10m | 6:52AM0.18m | 7:28PM0.06m | 7:47AM0.17m | 7:48PM0.02m | 8:41AM0.16m | 8:12PM-0.01m | ||||||||
 |  |  | |  |  | | | | | | | | |  | | | | | | | |
 | 6:33 | — | — | 6:35 | — | — | 6:35 | — | — | 6:35 | — | — | 6:35 | — | — | 6:35 | — | — | 6:37 | — | — |
 | — | 6:09 | — | — | 6:08 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:06 | — | — | 6:05 | — |
mm | 1 | — | 3 | 2 | 2 | 4 | 2 | 1 | 2 | 2 | 1 | 6 | — | 1 | — | — | — | 1 | — | — | — |
Temp °C | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 24 | 26 | 26 | 24 | 25 | 25 | 24 | 25 | 25 | 24 |
Feels °C | 24 | 24 | 23 | 23 | 24 | 24 | 23 | 23 | 24 | 25 | 25 | 24 | 27 | 27 | 25 | 27 | 26 | 26 | 26 | 26 | 24 |
Swell 1 Height (m) Direction Period (s) | N 12 | N 12 | N 11 | N 12 | N 12 | N 11 | N 10 | N 10 | S 11 | SW 15 | SW 15 | SE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NE 8 | ENE 8 | ENE 8 | ENE 8 | NNW 11 |
| kJ | 184 | 134 | 85 | 98 | 66 | 38 | 35 | 18 | 21 | 58 | 55 | 21 | 215 | 187 | 192 | 153 | 64 | 130 | 89 | 65 | 176 |
Swell 2 Height (m) Direction Period (s) | S 13 | S 13 | S 12 | S 12 | S 12 | S 12 | SW 16 | SW 15 | SW 16 | S 12 | SE 9 | SW 15 | SSE 6 | SSE 6 | SSE 6 | NE 13 | SSW 13 | SSW 13 | SSW 14 | SSW 15 | SSW 16 |
| kJ | 83 | 52 | 44 | 44 | 44 | 41 | 64 | 56 | 64 | 25 | 13 | 54 | 15 | 16 | 17 | 60 | 135 | 102 | 113 | 222 | 283 |
Swell 3 Height (m) Direction Period (s) | NW 13 | NW 13 | SW 17 | SSW 16 | SE 9 | SW 16 | SE 9 | S 11 | N 10 | N 9 | N 9 | S 12 | SW 14 | SW 14 | SW 13 | SE 6 | NE 11 | S 16 | S 18 | NNW 13 | SSW 12 |
| kJ | 46 | 43 | 72 | 25 | 12 | 64 | 12 | 21 | 17 | 15 | 6 | 11 | 51 | 47 | 45 | 10 | 61 | 137 | 156 | 133 | 119 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | — | — | — | — | ENE 8 | — | — | NE 3 | ENE 8 |
| kJ | 417 | 366 | 623 | 671 | 536 | 707 | 462 | 570 | 605 | 437 | 395 | 303 | — | — | — | — | 60 | — | — | 3 | 64 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 38 | 299 | 46 | 33 | 33 | 38 | 33 | 33 | 33 | 31 | 16 | 16 | 12 | 10 | 12 | 12 | 10 | 0 | 10 | 10 | 14 |
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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