Surf Forecasts:
Ammonias surf forecast from 9 Jul 2026:
- Most powerful swell: Sunday 12 Jul, 8PM (local time) - 7ft (2.2m), 8s period, ENE swell with 559 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 2.2m 8s and forecast to arrive on Sunday (Jul 12) at 8PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 15s period and expected on Wednesday (Jul 15) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Sun 12th Jul) | 7ft (2.2m) 8s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
Alright, Rusty here. Let's have a look at what's on the cards for Ammonias.
Well, truth be told, it's a pretty grim start. For the first week and a half, from the 9th of July right through to the 20th, the wind is just a nightmare. It's pinned onshore or cross-shore from the ENE, and with a moderate to fresh breeze, the waves are going to be a lumpy, choppy mess. We're looking at waves around 5ft to 7ft, but with that short period, it's all wind-slop. The combined energy is moderate at best, hitting 932 on the 12th, but with zero quality, it's just not worth paddling out. The water's sitting at 79°F, which is pretty average for this time of year, so nothing to get excited about there.
Then we get a real change. On the 21st of July, a very long period groundswell starts to show up. We're talking 20 seconds on the Tuesday morning, dropping to 19 seconds in the afternoon. This is proper energy, with the combined energy surging up to 1494. The swell is a bit smaller, around 3ft to 4ft, but it's coming from the east, which is a good direction for this spot. The wind is still cross-shore, but it's moderate and not as strong, so it'll be a bit more manageable. This is where you want to be. The longer period means better shaped waves and more energy in the water, and with that swell direction, it's going to be a lot more fun than the junk we've been seeing. The 22nd of July keeps the long period, 16 seconds, with similar size and energy, so the window is good.
Honestly, the standout is the 21st of July. That long period groundswell is the only real chance of a decent wave in this whole 16-day outlook. It's not perfect, but it's the best you're going to get.
Rusty.
Short Range ForecastModerate rain (total 10mm), heaviest on Thu morning. Warm (max 26°C on Thu afternoon, min 24°C on Thu morning). Mainly fresh winds. | Days 4-6 Weather SummaryModerate rain (total 13mm), heaviest on Sun afternoon. Warm (max 25°C on Sun morning, min 23°C on Sun night). Mainly fresh winds. | ||||||||||||||||||||
Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | |||||||||||||||
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 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | SSW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 536 | 525 | 426 | 365 | 330 | 306 | 432 | 369 | 394 | 405 | 536 | 527 | 439 | 345 | 279 | 263 | 294 | 287 | 249 | 256 | 314 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross | cross | cross | cross | cross | cross-on | cross | cross | cross-on | cross | cross-on |
High Tide | 12:45PM0.59m | 9:34PM0.22m | 1:33PM0.67m | 11:46PM0.18m | 2:19PM0.73m | 1:06AM0.18m | 3:04PM0.77m | 2:08AM0.19m | 3:47PM0.78m | 3:04AM0.21m | 4:29PM0.77m | 3:58AM0.23m | 5:08PM0.73m | 4:55AM0.26m | |||||||
Low Tide | 9:16PM0.22m | 5:17AM-0.06m | 9:34PM0.17m | 6:09AM-0.08m | 10:03PM0.14m | 7:03AM-0.10m | 10:34PM0.12m | 7:55AM-0.11m | 11:06PM0.11m | 8:46AM-0.10m | 11:38PM0.10m | 9:34AM-0.07m | 00:10AM0.09m | ||||||||
 | |  |  | |  | | | | | | | |  | | | | | | | | |
 | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — |
 | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:22 | — | — | 7:22 | — |
mm | 4 | 1 | — | — | — | 2 | — | 1 | 2 | 2 | 3 | 2 | — | — | 2 | 1 | — | 3 | 2 | — | 2 |
Temp °C | 25 | 26 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 26 | 24 |
Feels °C | 24 | 26 | 23 | 24 | 23 | 23 | 24 | 23 | 23 | 24 | 23 | 23 | 23 | 23 | 22 | 24 | 24 | 23 | 24 | 26 | 24 |
Swell 1 Height (m) Direction Period (s) | S 12 | S 12 | S 12 | S 12 | S 11 | SW 19 | SSW 18 | SW 18 | SW 17 | SSW 16 | SSW 16 | SW 16 | SSW 15 | SW 14 | SW 14 | SW 14 | SW 14 | W 15 | W 15 | W 15 | SSW 16 |
| kJ | 151 | 108 | 106 | 98 | 66 | 184 | 214 | 316 | 309 | 326 | 322 | 353 | 279 | 214 | 206 | 191 | 186 | 298 | 287 | 279 | 314 |
Swell 2 Height (m) Direction Period (s) | SE 8 | SE 8 | W 13 | W 13 | W 13 | S 11 | S 12 | SE 8 | SE 9 | SSE 13 | SSE 12 | SSE 12 | W 19 | W 18 | W 17 | W 16 | W 16 | SSW 13 | SW 13 | SSW 12 | W 15 |
| kJ | 11 | 10 | 30 | 28 | 55 | 60 | 44 | 25 | 27 | 53 | 49 | 48 | 112 | 150 | 142 | 257 | 248 | 111 | 162 | 103 | 209 |
Swell 3 Height (m) Direction Period (s) | W 14 | W 14 | SE 8 | W 15 | SE 8 | W 14 | W 14 | W 13 | S 13 | W 12 | SE 8 | SE 8 | SSE 12 | SSE 11 | SE 7 | SSW 19 | SE 6 | SSW 17 | SSW 18 | SSW 18 | SE 6 |
| kJ | 15 | 32 | 10 | 38 | 17 | 58 | 61 | 54 | 51 | 47 | 25 | 11 | 47 | 51 | 13 | 146 | 10 | 200 | 123 | 216 | 9 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 |
| kJ | 536 | 525 | 426 | 365 | 330 | 306 | 432 | 369 | 394 | 405 | 536 | 527 | 439 | 345 | 279 | 263 | 294 | 287 | 249 | 256 | 248 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 38 | 126 | 16 | 31 | 31 | 33 | 31 | 31 | 31 | 31 | 126 | 31 | 31 | 31 | 16 | 31 | 16 | 16 | 31 | 31 | 16 |
Best forecast wave conditions in Kaua'i | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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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
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