Surf Forecasts:
Ammonias surf forecast from 24 Jul 2026:
- Best quality surf: Wednesday 29 Jul, 5PM (local time) - 10ft (3.0m), 11s period, ENE swell with offshore winds.
- Most powerful swell: Wednesday 29 Jul, 2PM (local time) - 10ft (3.0m), 12s period, ENE swell with 2,676 kJ wave energy.
- Next surfable swell (1★+): Wednesday 29 Jul, 5PM (local time) - 10ft (3.0m), 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 5PM. The primary swell is predicted to be 3.0m and 11s period with a secondary swell of 0.8m and 14s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Ammonias in the next 16 days are 3.0m 12s and forecast to arrive on Wednesday (Jul 29) at 2PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 10s period and expected on Wednesday (Jul 29) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Wed 29th Jul) | 10ft (3.0m) 11s |
| Best Surf | 5PM (Wed 29th Jul) | 10ft (3.0m) 11s |
| Most Powerful | 2PM (Wed 29th Jul) | 10ft (3.0m) 12s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what Ammonias has in store for us over the next couple of weeks.
Right off the bat, I gotta be straight with you – the first week is a tough one. The surf kicks off on Friday the 24th, but it's a bit of a mess. We've got a 7ft swell coming from the ENE, but it's short period, windblown junk, and that cross-shore wind is going to make it lumpy. The wave energy is really strong (1116), but it's just not well-formed. Honestly, it's a struggle to find a good session in the first few days. The water temp is sitting at 80°, which is about spot on for this time of year.
The real standout, the one you've been waiting for, arrives on Wednesday the 29th. The morning shows a solid 10ft swell from the ENE, with a moderate 11-second period, and the energy is pumping at 2654. The wind is cross-offshore, which is a good sign, but it's the afternoon that's the absolute gem. The wind swings to a light offshore from the NW at 9 mph, and the swell holds at 10ft. That's a big, powerful wave, and with a 10-second period, it's going to be a proper groundswell. This is expert territory for sure, but for those who can handle it, the conditions will be clean and lined up. This is the best on offer.
After that, the swell drops back, and the wind stays onshore or cross-shore for the rest of the first week and into the start of August. There's a minor glimmer on Wednesday the 5th of August. The afternoon has a 5ft ENE swell, with a gentle cross-offshore breeze, and the energy is moderate (688). It's a clean, surfable wave, nothing huge, but it's a solid option for a fun session.
By the time we get to the weekend of the 7th and 8th of August, the swell has all but disappeared. We're looking at tiny waves under 2ft, and the wind is onshore. It's a dead period. So, to sum it up: if you're an experienced surfer, mark your calendar for Wednesday the 29th of July. The afternoon session is your best bet. For everyone else, the 5th of August offers a clean, manageable wave. Don't hold your breath for the rest of the run.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Fri morning. Warm (max 26°C on Fri afternoon, min 23°C on Fri night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Wed night. Warm (max 26°C on Tue morning, min 23°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | |||||||||||||||
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) | ENE 7 | SSW 17 | ENE 8 | SSW 19 | SSW 18 | SSW 18 | SSW 16 | ENE 8 | E 15 | E 14 | E 14 | E 14 | E 13 | E 13 | ENE 13 | ENE 12 | ENE 11 | ENE 10 | ENE 8 | ENE 8 | ENE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 419 | 428 | 428 | 627 | 731 | 790 | 575 | 452 | 424 | 492 | 439 | 515 | 976 | 1228 | 2304 | 2383 | 2099 | 853 | 521 | 376 | 327 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-off | cross | cross | cross-off | cross-off | off | cross-on | on | cross-on | cross-on |
High Tide | 1:36PM0.61m | 00:21AM0.18m | 2:14PM0.63m | 1:16AM0.20m | 2:48PM0.65m | 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 | |||||||
Low Tide | 10:06PM0.17m | 6:00AM0.03m | 10:10PM0.16m | 6:48AM0.01m | 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 | ||||||||
 | |  | |  |  |  | | | | | |  | |  | | |  | | | | |
 | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — |
 | — | 7:21 | — | — | 7:20 | — | — | 7:20 | — | — | 7:19 | — | — | 7:19 | — | — | 7:17 | — | — | 7:17 | — |
mm | 1 | 1 | 2 | 2 | — | — | — | — | — | — | — | — | 2 | 1 | — | — | — | 3 | 1 | — | 1 |
Temp °C | 25 | 26 | 25 | 24 | 25 | 24 | 25 | 26 | 24 | 25 | 25 | 24 | 26 | 26 | 25 | 25 | 26 | 26 | 26 | 27 | 25 |
Feels °C | 23 | 24 | 24 | 24 | 23 | 22 | 23 | 25 | 23 | 24 | 24 | 23 | 27 | 26 | 25 | 25 | 28 | 29 | 27 | 28 | 25 |
Swell 1 Height (m) Direction Period (s) | S 12 | SSW 17 | SSW 16 | SSW 19 | SSW 18 | SSW 18 | SSW 16 | SSW 16 | E 15 | E 14 | E 14 | E 14 | E 13 | E 13 | SSW 13 | ENE 12 | ENE 11 | ENE 10 | ENE 8 | S 13 | S 13 |
| kJ | 190 | 428 | 302 | 627 | 731 | 790 | 575 | 452 | 424 | 492 | 439 | 515 | 976 | 1228 | 137 | 2383 | 2099 | 853 | 521 | 219 | 209 |
Swell 2 Height (m) Direction Period (s) | SSW 18 | S 12 | S 20 | SSW 16 | S 11 | E 13 | E 15 | E 15 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | S 16 | S 14 | S 14 | S 14 | S 13 | SSE 5 | SSE 6 |
| kJ | 356 | 138 | 408 | 196 | 61 | 53 | 107 | 294 | 416 | 292 | 284 | 213 | 189 | 141 | 77 | 206 | 264 | 232 | 225 | 17 | 26 |
Swell 3 Height (m) Direction Period (s) | S 22 | S 21 | S 12 | S 12 | E 14 | E 16 | E 12 | S 11 | SSE 11 | S 10 | SE 11 | SE 11 | SE 10 | SE 10 | SE 8 | SSE 10 | SSW 19 | SW 19 | SW 18 | SW 18 | SSW 16 |
| kJ | 86 | 326 | 136 | 95 | 33 | 45 | 47 | 20 | 12 | 8 | 18 | 18 | 15 | 24 | 3 | 9 | 37 | 58 | 154 | 152 | 175 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | NNE 9 | NNE 7 | ENE 13 | ENE 12 | — | S 4 | SSE 4 | ENE 8 | ENE 7 |
| kJ | 419 | 426 | 428 | 483 | 519 | 536 | 452 | 408 | 327 | 279 | 282 | 237 | 264 | 145 | 2304 | 1857 | — | 28 | 26 | 376 | 327 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 33 | 33 | 16 | 31 | 31 | 31 | 31 | 31 | 16 | 16 | 31 | 14 | 16 | 31 | 14 | 12 | 0 | 11 | 118 | 118 | 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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