Surf Forecasts:
Ammonias surf forecast from 23 Jul 2026:
- Most powerful swell: Tuesday 28 Jul, 11AM (local time) - 6.5ft (2.0m), 13s period, ENE swell with 1,380 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 2.0m 13s and forecast to arrive on Tuesday (Jul 28) at 11AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 7s period and expected on Tuesday (Jul 28) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (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 break down what’s happening at Ammonias.
It’s a reef break, exposed to the swell, and it’s geared for intermediate surfers. It’s fairly consistent, but expect crowds to be a common sight. Water temp is about 80°F, which is pretty normal for the time of year – nothing out of the ordinary.
The first week is a real slog. From Wednesday the 22nd through to maybe the 29th, it’s mostly marginal or poor. The wind is blowing from the ENE at about 15-18 mph, cross-shore or cross-onshore, keeping the surface lumpy and messy. Swell is around 2ft to 4ft from the SSW, but the energy is high – in the thousands – so there’s a lot of power moving around, but it’s not clean. The period is all over the place, sometimes short, sometimes long, but with that wind, it’s just not working.
Thursday the 30th morning, though, that’s the one to circle. The wind goes glassy, like 3 mph from the ENE, and the swell jumps to about 7ft from the ENE with a period of 10 seconds. The energy is hefty at 1214, and it’s glassy. That’s a proper session for experienced surfers – 7ft is big, so not for beginners. The afternoon turns a bit onshore with a south wind, so the morning window is key.
From Friday the 31st of July into the first week of August, it’s back to poor or marginal. The swell comes from the E and ENE, but the period drops to 7 seconds, and the wind stays cross or cross-on, making it choppy and unappealing. The energy also drops significantly.
The hands-down best day is Thursday morning the 30th of July. Glassy, clean, solid 7ft swell from the ENE. That’s your move. Get in early, because the crowds will be there, and it’s fully exposed. The rest of the 16 days is a mix of poor conditions and long gaps, so don’t waste your energy on the junk.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Wed afternoon. Warm (max 26°C on Wed afternoon, min 24°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Sat afternoon. Warm (max 26°C on Sun afternoon, min 23°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Wed 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | ||||||||||||||
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) | SSW 23 | SSW 22 | SSW 20 | SSW 20 | SSW 18 | ENE 7 | SSW 17 | ENE 7 | ENE 8 | SSW 18 | SSW 18 | SSW 16 | SSW 16 | SSW 16 | E 14 | E 14 | E 13 | ENE 13 | ENE 13 | ENE 13 |
Wave Graph  | ||||||||||||||||||||
 kJ | 564 | 480 | 528 | 399 | 469 | 431 | 428 | 526 | 502 | 731 | 790 | 575 | 452 | 416 | 390 | 445 | 420 | 1380 | 1359 | 1338 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-off |
High Tide | 12:55PM0.57m | 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 | |||||||||
Low Tide | 4:16AM0.04m | 5:07AM0.04m | 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 | |||||||||
 |  | |  |  | |  |  | | | | | | | | | | | | | |
 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — |
 | 7:21 | — | — | 7:21 | — | — | 7:21 | — | — | 7:20 | — | — | 7:20 | — | — | 7:19 | — | — | 7:19 | — |
mm | 3 | — | 1 | — | 1 | — | — | — | — | 1 | 3 | — | — | 1 | 1 | — | — | — | — | — |
Temp °C | 26 | 24 | 25 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 25 | 26 | 24 | 25 | 25 | 24 | 25 | 26 | 24 |
Feels °C | 25 | 23 | 23 | 25 | 24 | 24 | 23 | 24 | 24 | 23 | 23 | 23 | 24 | 23 | 23 | 24 | 23 | 24 | 25 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 23 | S 13 | SSW 20 | S 13 | SSW 18 | S 12 | SSW 17 | SSW 16 | SSW 19 | SSW 18 | SSW 18 | SSW 16 | SSW 16 | E 14 | E 14 | E 14 | E 13 | SSW 14 | SSW 13 | SSW 13 |
| kJ | 564 | 212 | 528 | 219 | 469 | 190 | 428 | 302 | 502 | 731 | 790 | 575 | 452 | 412 | 390 | 445 | 420 | 189 | 141 | 98 |
Swell 2 Height (m) Direction Period (s) | S 13 | SSW 22 | S 13 | SSW 20 | S 13 | SSW 18 | S 12 | S 20 | SSW 16 | S 11 | E 13 | E 15 | E 15 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SE 8 | SE 9 | SSW 15 |
| kJ | 173 | 480 | 209 | 399 | 85 | 356 | 138 | 408 | 223 | 63 | 53 | 107 | 275 | 416 | 288 | 284 | 213 | 18 | 19 | 75 |
Swell 3 Height (m) Direction Period (s) | S 10 | E 12 | SSW 16 | E 12 | S 11 | S 22 | S 21 | S 12 | S 12 | E 14 | E 16 | E 12 | S 11 | SSE 11 | SE 11 | SE 11 | SE 9 | S 10 | S 16 | SSE 8 |
| kJ | 78 | 103 | 100 | 98 | 56 | 86 | 326 | 100 | 95 | 33 | 46 | 47 | 35 | 12 | 18 | 18 | 13 | 8 | 46 | 6 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 6 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 13 | ENE 13 | ENE 13 |
| kJ | 286 | 194 | 384 | 311 | 340 | 431 | 390 | 526 | 483 | 545 | 506 | 441 | 362 | 344 | 279 | 243 | 222 | 1380 | 1359 | 1338 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 31 | 16 | 33 | 33 | 16 | 31 | 33 | 16 | 16 | 31 | 16 | 31 | 33 | 16 | 31 | 31 | 16 | 16 | 16 | 14 |
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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