Surf Forecasts:
Ammonias surf forecast from 5 Jul 2026:
- Most powerful swell: Saturday 11 Jul, 2AM (local time) - 8ft (2.5m), 8s period, ENE swell with 806 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 2.5m 8s and forecast to arrive on Saturday (Jul 11) 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 0.4m 13s period and expected on Friday (Jul 10) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Sat 11th Jul) | 8ft (2.5m) 8s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
Updates in hr min s Forecast update imminent
Listen up, fellas, let’s get the story straight on Ammonias for the next couple of weeks.
To be honest, it’s a rough patch. We’ve got swell, sure, but the wind is just going to ruin it for us. There’s no single day that’s jumping out as the one to chase. The first week is nearly all cross-shore breeze, making for a lumpy, cross-chop on the face. It’s gonna be a battle, not a smooth ride.
Starting Sunday, July 5th, we’ve got a long-period groundswell from the SSW, about 3ft with an 18-second interval. That’s quality energy, but a cross-shore wind at 15-19 mph is going to tear the surface up. The combined energy is moderate (1055). By Monday the 6th, the swell picks up to around 7ft, but the period drops to a weak 7 seconds from the ENE, with the same cross-shore wind at 15-19 mph. That’s just short-period windswell, and it’s going to be a mess. This pattern of 6-8ft ENE windswell with cross-shore winds runs all the way through Saturday the 11th. The energy is moderate, but the quality is poor. The wave state keeps calling it “lumpy” or “choppy.” No clean windows here.
We see a switch on Sunday the 12th of July with a longer-period SW groundswell, about 3ft at a 16-second period. The combined energy is still moderate (773). But the wind is still cross-shore, so it’s going to be bumpy. By Monday the 13th, it drops to about 3ft from the SSW. Not enough to get stoked about, especially with the same wind.
After that, it’s back into a long run of short-period ENE windswell from the 14th to the 20th of July. Swell sizes hang between 5ft and 6ft, but the period is short at 6-7 seconds. The wind stays cross to cross-on, keeping the ocean choppy. The wave energy is still moderate but dropping into the weak range by the end.
What you need to know: There’s no five-star day in this forecast, mate. The swell is there, but the wind is the enemy. The best bet is to try and find a morning session before the wind really picks up, but it’s still marginal. Honestly, this setup looks way more interesting for a kite session than a paddle. Sit tight and wait for a better forecast.
Rusty
Short Range ForecastModerate rain (total 13mm), heaviest on Sat night. Warm (max 25°C on Sun afternoon, min 23°C on Mon night). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 8mm), mostly falling on Tue night. Warm (max 26°C on Wed afternoon, min 24°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Sat 11 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | SSW 19 | SSW 18 | SSW 18 | SSW 16 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 608 | 522 | 510 | 437 | 516 | 581 | 613 | 645 | 507 | 509 | 495 | 387 | 390 | 344 | 379 | 400 | 469 | 456 | 806 | 691 | 531 |
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 | cross-on | cross | cross | cross | cross | cross-on | cross | cross |
High Tide | 8:00AM0.26m | 7:11PM0.49m | 9:31AM0.32m | 7:37PM0.42m | 10:50AM0.41m | 8:03PM0.35m | 11:53AM0.50m | 8:28PM0.28m | 12:45PM0.59m | 9:34PM0.22m | 1:33PM0.67m | 11:46PM0.18m | 2:19PM0.73m | ||||||||
Low Tide | 2:02AM0.07m | 12:26PM0.17m | 2:33AM0.05m | 1:48PM0.24m | 3:07AM0.02m | 3:53PM0.29m | 3:45AM-0.01m | 6:49PM0.27m | 4:28AM-0.03m | 9:16PM0.22m | 5:17AM-0.06m | 9:34PM0.17m | 6:09AM-0.08m | ||||||||
 |  | | | | | | |  | | |  |  | | | | | | | | | |
 | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — |
 | 7:23 | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 |
mm | 2 | 2 | 2 | 1 | 1 | 1 | 3 | 1 | — | 2 | — | — | — | — | — | 2 | 2 | 2 | 9 | 3 | — |
Temp °C | 24 | 24 | 25 | 24 | 24 | 25 | 24 | 24 | 25 | 24 | 25 | 26 | 24 | 25 | 26 | 24 | 25 | 26 | 25 | 24 | 25 |
Feels °C | 23 | 23 | 24 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 23 | 24 | 23 | 24 | 25 | 23 | 25 | 26 | 25 | 23 | 24 |
Swell 1 Height (m) Direction Period (s) | SSW 19 | SSW 18 | SSW 18 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | S 13 | S 12 | S 12 | S 12 | S 12 | S 12 | SW 19 | SSW 18 | SW 18 |
| kJ | 608 | 522 | 510 | 437 | 446 | 481 | 355 | 350 | 341 | 265 | 247 | 239 | 168 | 151 | 108 | 106 | 70 | 67 | 184 | 216 | 316 |
Swell 2 Height (m) Direction Period (s) | SSW 15 | SSW 14 | SE 9 | SSW 13 | SE 9 | SE 9 | SE 9 | SE 8 | SE 8 | SE 8 | SE 9 | SE 8 | SE 8 | SSE 8 | SE 8 | SE 6 | W 15 | W 13 | S 11 | S 12 | W 13 |
| kJ | 188 | 138 | 13 | 69 | 21 | 20 | 19 | 18 | 18 | 11 | 20 | 11 | 23 | 26 | 50 | 9 | 39 | 55 | 61 | 44 | 55 |
Swell 3 Height (m) Direction Period (s) | SE 10 | SE 9 | SSW 11 | SE 9 | S 20 | S 11 | NW 9 | N 9 | W 9 | — | W 16 | S 18 | W 15 | W 14 | W 14 | W 13 | W 13 | SW 20 | W 14 | W 14 | S 12 |
| kJ | 15 | 13 | 12 | 20 | 30 | 2 | 3 | 2 | 2 | — | 5 | 6 | 17 | 15 | 32 | 54 | 28 | 101 | 58 | 63 | 44 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 |
| kJ | 327 | 382 | 435 | 369 | 516 | 581 | 613 | 645 | 507 | 509 | 495 | 387 | 390 | 344 | 379 | 400 | 469 | 456 | 806 | 691 | 531 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 31 | 33 | 38 | 31 | 31 | 31 | 31 | 31 | 38 | 31 | 31 | 16 | 31 | 16 | 16 | 31 | 16 | 16 | 38 | 31 |
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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