Surf Forecasts:
Ammonias surf forecast from 2 Aug 2026:
- Most powerful swell: Sunday 2 Aug, 2AM (local time) - 8ft (2.5m), 8s period, ENE swell with 976 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 Sunday (Aug 02) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Sun 2nd Aug) | 8ft (2.5m) 8s |
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, this stretch is a bit of a struggle. The first week and a half is mostly a write-off – messy winds, lumpy conditions, and barely any rideable waves. We’ve got a real gap here from Sunday the 2nd right through to the morning of Tuesday the 12th of August before anything even starts to look interesting. That’s a solid ten days of mediocrity.
The one spot on the map is Ammonias (a reef break). It’s fairly consistent, but the wind is almost always cross or cross-on, and the swell is short-period and weak for most of that first week. The water temp anomaly is unremarkable, so nothing unusual there – just average for the time of year.
Now, there is a glimmer. Tuesday the 12th of August morning shows a south swell arriving with a very long period of 18 seconds and a combined energy of 1304 – that’s moderate to strong energy. Swell height is around 4 ft, which is a nice size for intermediates, and the direction is optimum from the south for this spot. The wind is still cross-shore from the ENE at 12 mph, so it’s not glassy, but it’s manageable. That long period groundswell will really suit a reef like Ammonias, giving it shape and power, though the sets will be a bit spread out. This is the best of the bunch by a long shot.
The rest of the second week stays in the marginal category, with similar south swells but the wind shifts more cross-on and the energy drops a bit. Not a standout, but if you’re desperate, Wednesday the 13th or Thursday the 14th might offer a few, but the conditions are likely choppy.
If you’re looking for a kite, the constant moderate cross-shore winds might actually be more interesting than the surfing for much of this period.
Stay patient, and pencil in Tuesday the 12th for a dawn mission.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Sat night. Warm (max 26°C on Sun morning, min 23°C on Sun night). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Thu afternoon. Warm (max 26°C on Wed afternoon, min 24°C on Tue night). Wind will be generally light. | ||||||||||||||||||
Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | ||||||||||||||
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) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | SW 20 | ENE 6 |
Wave Graph  | |||||||||||||||||||
 kJ | 976 | 776 | 642 | 554 | 402 | 306 | 299 | 583 | 515 | 561 | 373 | 312 | 116 | 177 | 192 | 138 | 128 | 98 | 182 |
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-on | cross-on | cross | cross | cross |
High Tide | 6:19AM0.34m | 5:54PM0.51m | 7:26AM0.38m | 6:14PM0.44m | 8:45AM0.44m | 6:28PM0.37m | 10:10AM0.50m | 11:24AM0.57m | 12:26PM0.64m | ||||||||||
Low Tide | 00:22AM0.07m | 11:33AM0.16m | 00:50AM0.05m | 12:35PM0.23m | 1:21AM0.04m | 2:08PM0.29m | 1:58AM0.03m | 2:46AM0.02m | 3:47AM0.01m | 4:56AM-0.01m | |||||||||
 |  |  |  |  | | |  | |  | |  |  | | | | | |  | |
 | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — |
 | 7:16 | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:14 | — | — | 7:13 | — |
mm | 2 | 1 | — | — | — | — | — | — | — | — | — | 1 | 1 | 1 | 2 | 1 | — | — | — |
Temp °C | 25 | 26 | 26 | 24 | 25 | 26 | 24 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 23 | 24 | 24 | 22 | 25 | 26 | 24 | 26 | 27 | 27 | 26 | 28 | 27 | 27 | 27 | 27 | 27 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | E 14 | E 14 | E 14 | E 13 | E 13 | E 13 | E 12 | SSW 12 | SSW 12 | SSW 11 | SSW 11 | SSW 15 | ENE 9 | SSW 14 | SSW 14 | SSW 14 | SE 7 | SSW 14 | SSW 14 |
| kJ | 199 | 194 | 140 | 123 | 86 | 84 | 104 | 81 | 77 | 68 | 46 | 87 | 116 | 81 | 80 | 81 | 14 | 74 | 111 |
Swell 2 Height (m) Direction Period (s) | SSW 14 | SSW 14 | SSW 13 | SE 7 | SSW 13 | SSW 12 | SE 6 | SE 6 | SSE 8 | SSW 15 | SSE 13 | SSW 11 | SSW 15 | SSE 11 | SSE 11 | S 11 | SSW 14 | SE 7 | SE 8 |
| kJ | 131 | 77 | 68 | 14 | 34 | 50 | 19 | 9 | 28 | 89 | 55 | 38 | 87 | 43 | 42 | 39 | 78 | 13 | 30 |
Swell 3 Height (m) Direction Period (s) | N 10 | N 9 | SE 8 | SW 13 | SE 7 | SE 7 | SSW 12 | W 13 | SW 16 | SSE 13 | SW 15 | S 12 | S 12 | SSW 10 | SSW 10 | SE 7 | S 11 | SW 20 | SSW 19 |
| kJ | 17 | 14 | 16 | 42 | 13 | 13 | 48 | 31 | 69 | 58 | 60 | 46 | 46 | 20 | 18 | 14 | 35 | 98 | 148 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 5 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 5 | ENE 6 |
| kJ | 976 | 776 | 642 | 554 | 402 | 306 | 299 | 583 | 515 | 561 | 373 | 312 | 46 | 177 | 192 | 138 | 128 | 90 | 182 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 38 | 38 | 126 | 16 | 31 | 31 | 16 | 31 | 31 | 16 | 31 | 12 | 15 | 31 | 31 | 16 | 31 | 16 | 16 |
Best forecast wave conditions in Kaua'i | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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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