
Surf Forecasts:
Ammonias surf forecast from 27 Jul 2026:
- Best quality surf: Wednesday 29 Jul, 8AM (local time) - 7ft (2.2m), 11s period, ENE swell with cross-offshore winds.
- Most powerful swell: Tuesday 28 Jul, 11PM (local time) - 7ft (2.2m), 12s period, E swell with 1,486 kJ wave energy.
- Next surfable swell (1★+): Wednesday 29 Jul, 8AM (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 8AM. The primary swell is predicted to be 2.2m 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 2.2m 12s and forecast to arrive on Tuesday (Jul 28) at 11PM. 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 7s period and expected on Tuesday (Jul 28) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Wed 29th Jul) | 7ft (2.2m) 11s |
| Best Surf | 8AM (Wed 29th Jul) | 7ft (2.2m) 11s |
| Most Powerful | 11PM (Tue 28th Jul) | 7ft (2.2m) 12s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
G’day, it’s Rusty. Looks like we’ve got a bit of a wait before anything really gets going at Ammonias. The first few days are pretty marginal, but the window opens up towards the back end of July and into early August. Let’s break it down.
Right now, Monday the 27th and Tuesday the 28th are just not worth paddling out for. The swell is there, but the wind is cross and cross-off, and the energy is moderate (around 778-1535). The waves are messy and the conditions are a write-off for any real fun. The water temp is about average for the time of year, nothing to write home about.
Wednesday the 29th is where things finally start to look up. That morning, we’ve got a clean 8ft swell from the ENE with a period of 11 seconds, and a light cross-offshore breeze from the north at just 6 mph. The combined energy is strong (1536), and the conditions are described as excellent for experienced surfers. This is the standout of the whole outlook. Clean, lined-up waves, and the reef at Ammonias should handle that long-period groundswell nicely. Expect longer gaps between sets, but the shape will be good. Just keep in mind this spot is for intermediate to advanced surfers, and it can get crowded.
Thursday the 30th through the weekend drops off again. The wind turns onshore and cross-onshore, the period shortens to 7-8 seconds, and the energy drops back to moderate. Friday the 31st is particularly poor with choppy, messy conditions. Not worth a session.
The first weekend of August (1st and 2nd) sees a bump in size – 8ft to 8ft from the east – but the wind is a fresh cross-shore at 19 mph, making it lumpy and unpleasant. The energy is strong (up to 1150), but the quality is poor. If you’re a kite surfer, this might be your window, but for paddle surfing, it’s a miss.
The following week, from Monday the 3rd through to Sunday the 9th, is a mixed bag. Swell hangs around 5ft to 7ft, but the wind stays cross, cross-on, or onshore, with moderate energy. A few periods of longer period swell (12-15 seconds) pop up, but they’re accompanied by a cross-onshore chop. The 12-second swell on the 4th and 5th is too straight for a beach break, but Ammonias is a reef, so it might offer a few, but the wind ruins it. The 9th of August (Sunday) afternoon shows a slight improvement with a marginal 6ft ENE swell and 7-second period, but it’s still just a maybe.
The 10th and 11th of August (Monday and Tuesday) see a return to 7ft from the ENE with 8-second period, but again, cross-onshore wind and poor conditions dominate. Not worth getting excited about.
Overall, the only real standout is Wednesday morning, the 29th of July. That’s your best bet. Clean, powerful, and offshore. Everything else is a gamble at best. If you’re patient, that one session might be a gem.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Tue morning. Warm (max 27°C on Wed afternoon, min 24°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Wed night. Warm (max 27°C on Thu morning, min 25°C on Wed night). Winds increasing (light winds from the SSW on Wed night, fresh winds from the ENE by Sat afternoon). | ||||||||||||||||||
Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | ||||||||||||||
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 15 | E 14 | E 14 | E 14 | E 13 | E 13 | E 12 | ENE 11 | ENE 10 | ENE 9 | ENE 8 | ENE 8 | ENE 7 | E 7 | E 8 | ENE 7 | E 8 | E 8 | ENE 8 |
Wave Graph | |||||||||||||||||||
424 | 478 | 439 | 631 | 1110 | 1359 | 1412 | 1268 | 926 | 380 | 302 | 295 | 310 | 348 | 367 | 645 | 775 | 781 | 850 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross-off | cross | cross-off | cross-off | cross-off | cross | cross-on | on | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross |
High Tide | 1:57AM0.21m | 3:20PM0.66m | 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 | |||||||
Low Tide | 10:20PM0.16m | 7:31AM-0.01m | 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 | ||||||
— | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | |
7:20 | — | 7:19 | — | — | 7:19 | — | — | 7:17 | — | — | 7:17 | — | — | 7:16 | — | — | 7:16 | — | |
mm | — | — | — | — | 2 | — | — | — | 2 | 1 | 1 | — | — | — | — | — | — | — | 2 |
Temp °C | 24 | 25 | 26 | 24 | 26 | 26 | 25 | 26 | 27 | 26 | 27 | 27 | 25 | 26 | 27 | 25 | 26 | 26 | 25 |
Feels °C | 22 | 24 | 25 | 23 | 27 | 27 | 25 | 29 | 31 | 30 | 29 | 30 | 26 | 26 | 26 | 25 | 24 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | E 15 | E 14 | E 14 | E 14 | E 13 | E 13 | E 12 | ENE 11 | ENE 10 | ENE 9 | ENE 8 | S 13 | S 13 | S 12 | SW 15 | SSW 15 | E 15 | E 15 | E 15 |
424 | 478 | 439 | 631 | 1110 | 1359 | 1412 | 1268 | 926 | 380 | 302 | 276 | 206 | 146 | 229 | 144 | 210 | 208 | 267 | |
Swell 2 Height (m) Direction Period (s) | SSW 16 | SSW 15 | SSW 15 | 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 |
416 | 292 | 284 | 213 | 189 | 130 | 137 | 268 | 264 | 293 | 284 | 152 | 175 | 169 | 141 | 150 | 123 | 123 | 133 | |
Swell 3 Height (m) Direction Period (s) | SE 11 | S 10 | S 11 | SE 11 | SE 10 | S 16 | S 16 | N 8 | SSW 19 | N 7 | SW 18 | E 19 | SSE 6 | E 16 | E 15 | S 12 | S 11 | S 11 | S 11 |
5 | 8 | 9 | 18 | 25 | 46 | 77 | 45 | 37 | 33 | 154 | 28 | 15 | 119 | 109 | 70 | 39 | 38 | 21 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | NE 7 | NE 7 | NNE 7 | NNE 5 | NNE 6 | WNW 9 | — | SE 3 | — | ENE 8 | ENE 7 | E 7 | E 8 | ENE 7 | E 8 | E 8 | ENE 8 |
362 | 289 | 261 | 321 | 178 | 102 | 115 | 8 | — | 7 | — | 295 | 310 | 348 | 367 | 645 | 775 | 781 | 850 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 16 | 16 | 16 | 14 | 16 | 14 | 14 | 0 | 11 | 11 | 38 | 15 | 16 | 38 | 127 | 46 | 46 | 301 | 46 |
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










