Surf Forecasts:
Ammonias surf forecast from 25 Jul 2026:
- Best quality surf: Wednesday 29 Jul, 11AM (local time) - 10ft (3.0m), 12s period, ENE swell with offshore winds.
- Most powerful swell: Wednesday 29 Jul, 8AM (local time) - 10ft (3.0m), 12s period, ENE swell with 2,657 kJ wave energy.
- Next surfable swell (1★+): Wednesday 29 Jul, 11AM (local time) - 10ft (3.0m), 12s 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 3.0m and 12s period with a secondary swell of 0.7m 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 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 7s period and expected on Monday (Jul 27) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Wed 29th Jul) | 10ft (3.0m) 12s |
| Best Surf | 11AM (Wed 29th Jul) | 10ft (3.0m) 12s |
| Most Powerful | 8AM (Wed 29th Jul) | 10ft (3.0m) 12s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
G’day, Rusty here. Look, I’ve been staring at the charts for Ammonias, and honestly, for the next week and a half, it’s a bit of a struggle. The first few days are a write-off – cross-shore winds, lumpy chop, and the wave energy is just sad. We’ve got a real dry spell until the 29th of July.
Then, on Wednesday the 29th of July, things finally click. The wind swings offshore from the NNW, light at just 6 mph, and that swell is a legitimate 10 ft from the ENE. The period is 12 seconds, so it’s got some proper grunt behind it. The combined energy is pumping at 2797, which is strong. This is the standout of the whole outlook. It’s a clean, powerful wave, but with that 10 ft height, it’s one for the experienced crew only. Beginners, stay on the sand. This is a reef break, so it’ll handle that long-period groundswell nicely. The afternoon sees the wind turn cross and the swell drop, so the morning session is the one.
After that, it’s back to the grind. From the 30th through to the 9th of August, the conditions are mostly messy. The wind stays cross or cross-onshore, the swell period drops to a short 8 seconds, and the energy is weak to moderate. A slight bump on the 4th of August with a 5 ft ENE swell and a 13-second period, but the wind is still cross, so it’s not the clean canvas you’re after. It’s a long stretch of average to poor, a real test of patience.
Rusty.
Short Range ForecastLight rain (total 9mm), mostly falling on Fri night. Warm (max 26°C on Mon afternoon, min 23°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 8mm), mostly falling on Tue morning. Warm (max 27°C on Wed afternoon, min 23°C on Mon night). Wind will be generally light. | ||||||||||||||||||
Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | ||||||||||||||
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 | SSW 19 | SSW 18 | SSW 18 | SSW 16 | ENE 8 | E 15 | E 14 | E 14 | E 13 | E 13 | E 13 | ENE 13 | ENE 12 | ENE 11 | ENE 9 | ENE 8 | ENE 8 | ENE 7 |
Wave Graph  | |||||||||||||||||||
 kJ | 428 | 627 | 731 | 662 | 575 | 452 | 424 | 485 | 432 | 499 | 1138 | 1247 | 2396 | 2582 | 1586 | 718 | 428 | 394 | 365 |
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-off | cross | cross | cross-off | off | cross | cross-on | cross-on | cross-on | cross-on |
High Tide | 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 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — |
 | 7:21 | — | 7:20 | — | — | 7:20 | — | — | 7:19 | — | — | 7:19 | — | — | 7:17 | — | — | 7:17 | — |
mm | 3 | 2 | 1 | 2 | 1 | — | — | — | — | — | 1 | 2 | 1 | 1 | — | 1 | 2 | — | — |
Temp °C | 25 | 25 | 25 | 24 | 24 | 25 | 24 | 25 | 26 | 24 | 26 | 26 | 25 | 25 | 27 | 26 | 27 | 27 | 26 |
Feels °C | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 24 | 25 | 23 | 27 | 27 | 25 | 27 | 29 | 30 | 29 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 19 | SSW 18 | SSW 18 | SSW 16 | SSW 16 | E 15 | E 14 | E 14 | E 13 | E 13 | E 13 | ENE 13 | ENE 12 | ENE 11 | ENE 9 | S 13 | S 13 | S 13 |
| kJ | 302 | 627 | 731 | 662 | 575 | 452 | 424 | 485 | 432 | 499 | 1138 | 1247 | 2396 | 2582 | 1586 | 718 | 225 | 219 | 206 |
Swell 2 Height (m) Direction Period (s) | S 20 | SSW 16 | S 11 | S 11 | E 15 | E 15 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | S 14 | S 14 | S 14 | SE 5 | SSE 5 | SSW 16 |
| kJ | 408 | 196 | 61 | 37 | 107 | 290 | 416 | 292 | 284 | 213 | 189 | 141 | 137 | 206 | 264 | 293 | 23 | 17 | 175 |
Swell 3 Height (m) Direction Period (s) | S 12 | S 12 | E 14 | E 13 | E 12 | S 11 | SSE 9 | S 10 | SE 11 | SE 11 | SE 11 | SE 10 | S 16 | SSE 10 | SSW 19 | SW 19 | SW 18 | SW 18 | SSE 6 |
| kJ | 136 | 95 | 33 | 53 | 47 | 20 | 7 | 8 | 18 | 18 | 29 | 24 | 77 | 9 | 37 | 58 | 154 | 152 | 26 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | NE 7 | NE 7 | NNE 9 | NE 7 | NNE 8 | — | — | ESE 4 | ENE 8 | ENE 8 | ENE 7 |
| kJ | 428 | 527 | 532 | 536 | 430 | 419 | 294 | 279 | 261 | 254 | 197 | 131 | 55 | — | — | 20 | 428 | 394 | 365 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 16 | 31 | 33 | 16 | 31 | 31 | 16 | 16 | 31 | 14 | 16 | 31 | 14 | 0 | 11 | 11 | 16 | 31 | 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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