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Ammonias Surf Forecast
/ HAW – Kaua'i (25 breaks) / Hawaii (267 breaks) /
Surf Forecasts:
Ammonias surfForecast / HAW – Kaua'i / USA
16 Day Weather and Surf, issued 7 pm Sunday 17 May 2026 HSTForecast update in hr min s Forecast update imminent
Ammonias surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Ammonias sea temperature is
24.7° C
(Which is normal for this time of year)Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 3.0m 8s and forecast to arrive on Thursday (May 21) at 11PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 12s period and expected on Wednesday (May 20) at 8AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11PM (Thu 21st May) | 10ft (3.0m) 8s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 9mm), mostly falling on Sun night. Warm (max 25°C on Sun night, min 23°C on Sun night). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Wed night. Warm (max 24°C on Thu morning, min 22°C on Fri night). Mainly fresh winds. | ||||||||||||||||||||
Monday 18 | Tuesday 19 | Wednesday 20 | Thursday 21 | Friday 22 | Saturday 23 | Sun 24 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
SSW 14 | ENE 8 | ENE 8 | ENE 8 | SSW 14 | SSW 15 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | |
256 | 361 | 441 | 314 | 229 | 305 | 270 | 404 | 584 | 745 | 824 | 847 | 1048 | 953 | 795 | 912 | 725 | 669 | 934 | 730 | 689 | |
Wind (km/h) | |||||||||||||||||||||
cross-on | cross-on | cross-on | cross | cross | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross | |
High Tide | 3:55AM0.15m | 5:47PM0.71m | 4:48AM0.13m | 6:40PM0.67m | 6:00AM0.12m | 7:36PM0.62m | 7:44AM0.13m | 8:32PM0.57m | 9:38AM0.17m | 9:27PM0.51m | 11:10AM0.24m | 10:17PM0.45m | 12:15PM0.33m | ||||||||
Low Tide | 00:21AM0.09m | 9:49AM-0.13m | 1:27AM0.09m | 10:35AM-0.09m | 2:35AM0.09m | 11:26AM-0.04m | 3:37AM0.08m | 12:26PM0.03m | 4:25AM0.06m | 1:41PM0.10m | 5:01AM0.04m | 3:18PM0.16m | 5:30AM0.02m | 5:07PM0.20m | |||||||
 |  |  |  | | | |  | | | | | |  | | | | | | | | |
 | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — |
 | 7:09 | — | 7:09 | — | — | 7:10 | — | — | 7:10 | — | — | 7:12 | — | — | 7:12 | — | — | 7:13 | — | — | 7:13 |
1 | — | 1 | — | — | 2 | 2 | 1 | 2 | 1 | 1 | — | 1 | — | 2 | — | — | 1 | 4 | — | — | |
Temp °C | 25 | 24 | 24 | 23 | 25 | 25 | 24 | 24 | 24 | 23 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 24 | 24 |
27 | 25 | 23 | 23 | 25 | 25 | 24 | 23 | 22 | 21 | 21 | 21 | 20 | 19 | 20 | 20 | 20 | 20 | 20 | 22 | 21 | |
Swell 1 Height (m) Direction Period (s) | ENE 8 | SSW 14 | SSW 14 | SSW 13 | SSW 14 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | S 16 | S 16 | S 15 | S 15 | S 14 | S 16 | S 16 | S 15 | S 15 | S 14 | S 13 |
 kJ | 256 | 233 | 166 | 158 | 229 | 305 | 239 | 165 | 152 | 101 | 134 | 129 | 157 | 109 | 94 | 188 | 181 | 218 | 155 | 175 | 130 |
Swell 2 Height (m) Direction Period (s) | SSW 14 | SSW 19 | SE 7 | SSE 7 | SSW 18 | SSE 7 | SSE 7 | NNW 11 | SSW 18 | SSW 17 | SSW 14 | SE 13 | SE 13 | SSE 12 | S 18 | S 13 | SSW 13 | SE 10 | SE 10 | NW 12 | S 16 |
| kJ | 239 | 251 | 26 | 37 | 176 | 18 | 18 | 25 | 62 | 93 | 71 | 44 | 42 | 57 | 154 | 90 | 57 | 46 | 27 | 37 | 46 |
Swell 3 Height (m) Direction Period (s) | SSE 8 | SSE 7 | SSW 19 | SSW 17 | SSE 7 | SE 9 | NNW 12 | SE 7 | NNW 11 | SSE 14 | SE 14 | SSW 12 | SSW 12 | S 18 | SE 12 | SE 12 | SE 12 | NNW 15 | NNW 13 | SSE 9 | NW 12 |
| kJ | 37 | 36 | 212 | 92 | 20 | 23 | 55 | 14 | 23 | 20 | 46 | 28 | 14 | 102 | 37 | 36 | 34 | 21 | 17 | 8 | 22 |
Wind waves Height (m) Direction Period (s) | — | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 6 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 |
| kJ | — | 361 | 441 | 314 | 210 | 226 | 270 | 404 | 584 | 745 | 824 | 847 | 1048 | 953 | 795 | 912 | 725 | 669 | 934 | 730 | 689 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 16 | 31 | 33 | 16 | 31 | 16 | 16 | 31 | 31 | 46 | 33 | 428 | 126 | 31 | 31 | 16 | 31 | 33 | 16 | 33 |
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)
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
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