
Surf Forecasts:
Ammonias surf forecast from 28 Jul 2026:
- Best quality surf: Wednesday 29 Jul, 8AM (local time) - 7ft (2.1m), 11s period, ENE swell with cross-offshore winds.
- Most powerful swell: Tuesday 28 Jul, 8PM (local time) - 6.5ft (2.0m), 13s period, E swell with 1,339 kJ wave energy.
- Next surfable swell (1★+): Wednesday 29 Jul, 8AM (local time) - 7ft (2.1m), 11s 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 Wednesday (Jul 29) at 8AM. The primary swell is predicted to be 2.1m and 11s period with a secondary swell of 0.7m and 14s. 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 2.0m 13s and forecast to arrive on Tuesday (Jul 28) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 9s period and expected on Wednesday (Jul 29) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Wed 29th Jul) | 7ft (2.1m) 11s |
| Best Surf | 8AM (Wed 29th Jul) | 7ft (2.1m) 11s |
| Most Powerful | 8PM (Tue 28th Jul) | 6.5ft (2.0m) 13s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright, Rusty here, let’s have a look at what’s on offer.
Honestly, Ammonias is a reef setup that’s mainly for intermediate surfers, and it’s fairly consistent, but the wind window is a bit touchy. The water temperature is sitting at about 80°, which is about average for the time of year, nothing unusual there.
We’ve got a bit of a wait for the good stuff. The first few days are a write-off. Tuesday the 28th has some solid swell energy, about 6ft from the east, with a decent 13-second period, but the wind is cross and gusty, so it’s messy. The energy is strong at 1461 (moderate to strong). By Wednesday morning the 29th, things start to clean up nicely. The wind swings to a light cross-offshore from the NNE, and the swell holds at 7ft from the east-northeast, period 11 seconds, energy 1160. That’s a clean, punchy wave for experienced surfers. Wednesday afternoon stays clean with a light breeze and a 7ft swell. That’s your best window in the first week.
Then Thursday the 30th through to the end of the first week and into the second week, the wind goes onshore or cross-shore, mostly fresh breezes, and the swell gets lumpy and choppy. The energy drops off, and the wave quality is poor. There’s a long stretch from Thursday afternoon all the way through to Sunday the 10th of August where it’s just not worth paddling out. Mostly moderate to fresh cross-shore winds, short period swell between 7-8 seconds, and the consistency is ruined by side-chop.
Now, looking into the second week, there’s a glimmer. On Monday the 10th of August morning, the swell direction flips to the SSW, with a very long period of 17 seconds and energy at 1698 (strong). The wave height is only 4ft, but that long period means it’s a groundswell. This kind of swell can be tricky at beach breaks, but at a reef like Ammonias, it could shape up nicely. The catch is the wind is a fresh cross-shore, so it’ll be lumpy. Monday afternoon stays similar. Tuesday the 11th and Wednesday the 12th have similar long-period SSW and S swells, but the wind stays onshore or cross-shore, so it’s a bit of a fight.
The standout, if you can pick it, is still Wednesday morning the 29th of July. The swell is 7ft from the east-northeast, the wind is light and cross-offshore, and the energy is solid. If you’re an intermediate or better, that’s the one to aim for. The long-period groundswell around the 10th of August is interesting, but the wind needs to drop for it to be a true gem.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Tue morning. Warm (max 27°C on Tue afternoon, min 24°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 5mm), mostly falling on Fri night. Warm (max 26°C on Fri morning, min 24°C on Fri night). Mainly fresh winds. | ||||||||||||||||||||
Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | |||||||||||||||
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) | E 13 | E 13 | E 12 | ENE 11 | ENE 10 | S 14 | ENE 8 | ENE 8 | S 13 | E 7 | ENE 7 | ENE 7 | E 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
Wave Graph | |||||||||||||||||||||
1247 | 1247 | 1174 | 875 | 798 | 297 | 284 | 291 | 225 | 311 | 383 | 579 | 762 | 781 | 889 | 885 | 820 | 627 | 492 | 385 | 306 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross-off | cross-off | glassy | on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 3:50PM0.67m | 3:10AM0.25m | 4:18PM0.66m | 3:49AM0.27m | 4:44PM0.65m | 4:33AM0.29m | 5:08PM0.61m | 5:22AM0.32m | 5:32PM0.57m | 6:19AM0.34m | 5:54PM0.51m | 7:26AM0.38m | 6:14PM0.44m | ||||||||
Low Tide | 8:11AM-0.02m | 10:50PM0.15m | 8:48AM-0.01m | 11:10PM0.13m | 9:25AM0.00m | 11:32PM0.11m | 10:03AM0.04m | 11:56PM0.09m | 10:44AM0.09m | 00:22AM0.07m | 11:33AM0.16m | 00:50AM0.05m | 12:35PM0.23m | 1:21AM0.04m | |||||||
6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | |
— | 7:19 | — | — | 7:17 | — | — | 7:17 | — | — | 7:16 | — | — | 7:16 | — | — | 7:15 | — | — | 7:15 | — | |
mm | 1 | — | — | — | 1 | 1 | — | — | — | — | — | 1 | — | — | 3 | 1 | — | — | — | — | 1 |
Temp °C | 26 | 27 | 25 | 27 | 26 | 25 | 27 | 27 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 26 | 24 |
Feels °C | 26 | 27 | 25 | 29 | 29 | 27 | 30 | 29 | 26 | 26 | 25 | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | E 13 | E 13 | E 12 | ENE 11 | ENE 10 | NE 9 | ENE 8 | S 13 | S 13 | S 12 | SW 15 | SW 15 | E 14 | E 14 | E 14 | E 14 | E 14 | E 14 | E 14 | E 13 | E 13 |
1247 | 1247 | 1174 | 875 | 798 | 388 | 280 | 219 | 206 | 146 | 232 | 220 | 148 | 146 | 194 | 199 | 198 | 144 | 138 | 128 | 168 | |
Swell 2 Height (m) Direction Period (s) | SSW 14 | S 13 | SSW 13 | S 14 | S 14 | S 14 | S 13 | SW 18 | SSW 16 | SSW 16 | S 12 | E 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SE 8 | SSW 13 | SE 8 | SE 6 |
189 | 130 | 137 | 268 | 264 | 297 | 284 | 152 | 175 | 169 | 104 | 159 | 123 | 123 | 131 | 75 | 68 | 16 | 34 | 14 | 19 | |
Swell 3 Height (m) Direction Period (s) | SE 10 | S 16 | S 16 | SW 21 | SSW 19 | SW 19 | SW 18 | E 19 | SE 7 | E 16 | E 15 | S 12 | S 11 | S 11 | SE 9 | SE 9 | SE 8 | SW 13 | SE 7 | SSW 12 | SSW 12 |
25 | 46 | 77 | 17 | 37 | 58 | 154 | 27 | 11 | 174 | 167 | 70 | 39 | 38 | 14 | 12 | 17 | 42 | 13 | 29 | 48 | |
Wind waves Height (m) Direction Period (s) | NNE 9 | NE 9 | NE 7 | NNE 7 | — | — | — | ENE 8 | ENE 6 | E 7 | ENE 7 | ENE 7 | E 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
244 | 287 | 151 | 75 | — | — | — | 291 | 225 | 311 | 383 | 579 | 762 | 781 | 889 | 885 | 820 | 627 | 492 | 385 | 306 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 31 | 14 | 0 | 0 | 0 | 32 | 31 | 16 | 46 | 122 | 300 | 301 | 299 | 38 | 33 | 33 | 31 | 16 | 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










