
Surf Forecasts:
Ammonias surf forecast from 28 Jul 2026:
- Best quality surf: Wednesday 29 Jul, 11AM (local time) - 7ft (2.2m), 11s period, ENE swell with cross-offshore winds.
- Most powerful swell: Tuesday 28 Jul, 8PM (local time) - 7ft (2.1m), 13s period, E swell with 1,491 kJ wave energy.
- Next surfable swell (1★+): Wednesday 29 Jul, 11AM (local time) - 7ft (2.2m), 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 11AM. The primary swell is predicted to be 2.2m and 11s period with a secondary swell of 0.8m 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 2.1m 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 2.1m 10s period and expected on Wednesday (Jul 29) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Wed 29th Jul) | 7ft (2.2m) 11s |
| Best Surf | 11AM (Wed 29th Jul) | 7ft (2.2m) 11s |
| Most Powerful | 8PM (Tue 28th Jul) | 7ft (2.1m) 13s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright, grab a coffee, let’s have a look at what’s coming up for Ammonias over the next couple of weeks.
First up, this is a reef break, so we’re already dealing with a setup that can turn an average swell into something with a bit of shape. Right now, things are a bit of a mixed bag. The first few days of the forecast period are a bit of a write-off – Tuesday the 28th and Wednesday the 29th of July have some swell, but the wind is a problem. Tuesday has a cross-shore breeze that’s making things messy, and the score is low. It’s not worth paddling out for.
Then, on Wednesday the 29th, we get a real window. The morning is clean with a cross-offshore breeze from the north at 9 mph, and the swell is 7ft from the ENE with a period of 11 seconds. That’s a decent groundswell, and the energy is solid at 1406 (moderate to strong). The afternoon is even better – glassy conditions with a light southwesterly at 3 mph, the same 7ft swell, but the period drops to 10 seconds. This is the standout for the whole outlook. The water is about average for this time of year, nothing unusual. The waves will be clean, well-shaped, and with that 7ft height, it’s for intermediate to experienced surfers only. Crowds are often here, so expect some company.
After that, it’s a long and painful run. From Thursday the 30th of July right through to the middle of the second week, the wind is almost entirely onshore or cross-shore, and the conditions are poor. The swell sticks around between 5ft and 8ft, but the quality is just not there. The energy drops off significantly, often below 1000. There’s a stretch from Thursday the 30th through to Wednesday the 5th of August where the surf is just plain messy or marginal. You’ll be fighting a chop, and the wind is a constant problem. There’s a brief flicker on Tuesday the 4th of August, with a 6ft swell and a 12-second period, but the wind is cross-shore and the conditions are only marginal. Not worth the drive.
The second week continues the poor run. From Thursday the 6th of August, the swell gets smaller and the period often drops to 6-8 seconds, which is short-period windswell. The energy is weak, often in the 300-800 range. The wind stays onshore or cross-shore. The conditions are consistently poor. There’s a small spike in swell on Saturday the 8th and Sunday the 9th, with 8ft and 7ft waves, but the wind is fresh and onshore, making it a lumpy mess. This is more appealing for kite surfers than paddle surfers.
The very end of the outlook, the 10th to the 12th of August, sees a shift in swell direction to a long-period S/SW groundswell, but the swell height is tiny (3ft to 4ft) and the wind is still onshore. The energy is moderate (around 800-1089), but with a 16-second period and a cross-onshore wind, it’s going to be a messy, weak wave that breaks too straight for a beach break setup. This reef might handle it, but the size is too small to get excited about.
Honestly, the only real day to get excited about is Wednesday the 29th of July. The glassy afternoon session is the best on offer. After that, it’s a long wait for any kind of change. For a reef break, this spot can be picky. The forecast can change, but as it stands, it’s one good day and then a whole lot of nothing.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Wed night. Warm (max 27°C on Tue afternoon, min 24°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 5mm), mostly falling on Sat night. Warm (max 27°C on Fri afternoon, min 24°C on Sat night). Mainly fresh winds. | ||||||||||||||||||
Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | ||||||||||||||
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 14 | E 13 | E 13 | E 12 | ENE 11 | ENE 10 | S 14 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | E 7 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
Wave Graph | |||||||||||||||||||
631 | 1110 | 1380 | 1459 | 1121 | 970 | 297 | 336 | 306 | 268 | 317 | 383 | 585 | 795 | 713 | 773 | 740 | 627 | 612 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-off | cross-off | cross-off | glassy | cross-on | on | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 2:33AM0.23m | 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 | |||||||
Low Tide | 10:33PM0.16m | 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 | ||||||
— | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | |
7:19 | — | 7:19 | — | — | 7:17 | — | — | 7:17 | — | — | 7:16 | — | — | 7:16 | — | — | 7:15 | — | |
mm | — | — | — | — | — | — | 3 | 3 | 1 | — | — | — | — | — | — | 4 | 1 | — | — |
Temp °C | 24 | 26 | 27 | 25 | 27 | 27 | 26 | 26 | 27 | 26 | 26 | 27 | 25 | 26 | 26 | 24 | 25 | 26 | 25 |
Feels °C | 23 | 26 | 28 | 25 | 29 | 30 | 30 | 27 | 29 | 27 | 27 | 26 | 24 | 24 | 24 | 22 | 23 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | E 14 | 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 15 | E 15 | E 14 | E 14 | E 14 | E 14 |
631 | 1110 | 1380 | 1459 | 1121 | 970 | 460 | 336 | 219 | 206 | 146 | 232 | 220 | 205 | 205 | 199 | 200 | 200 | 146 | |
Swell 2 Height (m) Direction Period (s) | SSW 14 | 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 | SW 13 |
213 | 189 | 130 | 137 | 268 | 264 | 297 | 284 | 152 | 175 | 169 | 104 | 157 | 123 | 123 | 131 | 75 | 68 | 42 | |
Swell 3 Height (m) Direction Period (s) | SE 11 | SE 10 | S 16 | S 16 | SW 21 | SSW 19 | SW 19 | SW 18 | E 19 | SE 6 | E 16 | E 15 | S 12 | S 11 | S 11 | SE 9 | SE 8 | SE 8 | SE 8 |
18 | 25 | 46 | 77 | 17 | 37 | 58 | 154 | 27 | 9 | 174 | 167 | 70 | 39 | 38 | 21 | 11 | 17 | 16 | |
Wind waves Height (m) Direction Period (s) | NE 7 | NE 7 | NE 7 | NNE 6 | NNE 7 | — | — | — | ENE 8 | ENE 7 | ENE 7 | ENE 7 | E 7 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
331 | 193 | 168 | 118 | 102 | — | — | — | 306 | 268 | 317 | 383 | 585 | 795 | 713 | 773 | 740 | 627 | 612 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 14 | 16 | 31 | 14 | 0 | 0 | 11 | 33 | 16 | 45 | 46 | 300 | 299 | 320 | 299 | 16 | 33 | 33 | 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










