Surf Forecasts:
Ammonias surf forecast from 4 Jul 2026:
- Most powerful swell: Tuesday 7 Jul, 8AM (local time) - 8ft (2.4m), 8s period, ENE swell with 657 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 2.4m 8s and forecast to arrive on Tuesday (Jul 07) at 8AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 8s period and expected on Saturday (Jul 04) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Tue 7th Jul) | 8ft (2.4m) 8s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
Updates in hr min s Forecast update imminent
Alright, Rusty here. Let’s have a look at what’s on offer.
Well, mates, the next couple of weeks are looking pretty bleak for a proper paddle. Ammonias is a reef setup, but the run of surf is patchy and the conditions are a mess for most of it. We’ve got a bit of long-period groundswell kicking off the period, but it’s fighting against moderate to fresh cross-shore winds that are ruining the surface. The water’s sitting at 79°, which is a perfectly normal for this time of year, so at least you won't be freezing while you're getting frustrated.
The first real chance you get is on Saturday, July 4th morning. We’ve got a solid 3ft groundswell from the south with a very long 21-second period. The combined energy is strong (1194), so there’s plenty of push, but it’s coming with a moderate cross-breeze. It’s a marginal call, but if the tide lines up, that long period should wrap nicely around the reef. It’s the best of a poor lot. After that, it all goes downhill fast. The swell switches to a short, choppy ENE windswell for the rest of the first week, and the wind stays cross or cross-onshore, making everything lumpy and poor. Sunday the 5th through to the 12th is a write-off; don’t bother.
The second week doesn’t offer much hope either. From Monday July 13th to Wednesday the 15th, we’ve got small 5ft to 6ft short-period ENE swell, but the cross-shore wind is still there. It’s only being rated as marginal at best, so you might get a few crumbly ones if you’re desperate. The crowd profile suggests it’s often busy here, so on these marginal days you’ll still have company for a poor wave.
The long-range outlook for the weekend of July 18th and 19th is a bit of a tease. We see another pulse of long-period SSW groundswell, but the wind is cross-onshore, and the wave height is tiny at 2ft to 2ft. The energy is moderate (458-541), but the wind is killing it completely. For a spot that’s fairly consistent, this is a shocker of a run. It’s a blank stretch, and honestly, forecasts can change, but right now it’s grim.
Stay patient, folks. Rusty.
Short Range ForecastModerate rain (total 11mm), heaviest on Sat night. Warm (max 25°C on Sat morning, min 23°C on Sat night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Tue night. Warm (max 26°C on Thu afternoon, min 23°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Saturday 4 | Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | |||||||||||||||
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 21 | S 20 | SSW 19 | SSW 18 | SSW 18 | ENE 7 | ENE 8 | ENE 8 | 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 |
Wave Graph  | |||||||||||||||||||||
 kJ | 573 | 490 | 608 | 522 | 510 | 469 | 545 | 514 | 613 | 554 | 514 | 464 | 452 | 358 | 286 | 340 | 294 | 327 | 310 | 325 | 456 |
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 | cross | cross-on | cross | cross | cross | cross | cross |
High Tide | 6:44PM0.55m | 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 | ||||||||
Low Tide | 11:30AM0.10m | 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 | ||||||||
 |  |  |  | | | | | | | | | | | | | | | | | | |
 | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — |
 | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — |
mm | — | — | 1 | 2 | 1 | 1 | 1 | 2 | 3 | — | — | 1 | — | 1 | 1 | 1 | — | 2 | 1 | 2 | 7 |
Temp °C | 25 | 25 | 24 | 24 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 26 | 24 | 25 | 25 | 24 |
Feels °C | 24 | 24 | 23 | 23 | 23 | 22 | 23 | 23 | 22 | 23 | 22 | 22 | 24 | 23 | 23 | 24 | 25 | 23 | 24 | 25 | 23 |
Swell 1 Height (m) Direction Period (s) | S 21 | S 20 | 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 11 | SW 19 |
| kJ | 573 | 490 | 608 | 522 | 510 | 437 | 446 | 481 | 355 | 350 | 341 | 265 | 247 | 239 | 168 | 151 | 108 | 106 | 99 | 66 | 184 |
Swell 2 Height (m) Direction Period (s) | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SE 9 | SSW 13 | SE 9 | SE 9 | SE 9 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 6 | W 14 | W 13 | W 14 |
| kJ | 217 | 148 | 188 | 138 | 12 | 68 | 21 | 20 | 19 | 18 | 11 | 18 | 18 | 24 | 54 | 33 | 31 | 16 | 57 | 55 | 58 |
Swell 3 Height (m) Direction Period (s) | SW 12 | SW 12 | SE 10 | SE 9 | SSW 11 | SE 9 | S 20 | SE 10 | NW 9 | N 9 | SE 11 | SE 10 | W 16 | S 18 | W 15 | W 14 | W 14 | W 14 | SSE 6 | SE 8 | S 11 |
| kJ | 35 | 35 | 24 | 12 | 12 | 12 | 30 | 4 | 3 | 2 | 4 | 4 | 5 | 6 | 17 | 34 | 32 | 57 | 4 | 17 | 39 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | 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 |
| kJ | 372 | 310 | 347 | 419 | 397 | 469 | 545 | 514 | 613 | 554 | 514 | 464 | 452 | 358 | 286 | 340 | 294 | 327 | 310 | 325 | 456 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 31 | 16 | 33 | 31 | 31 | 33 | 31 | 31 | 33 | 31 | 16 | 31 | 33 | 16 | 33 | 31 | 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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