
Surf Forecasts:
Ammonias surf forecast from 19 Jul 2026:
- Most powerful swell: Sunday 26 Jul, 2AM (local time) - 3.5ft (1.1m), 18s period, SSW swell with 790 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 1.1m 18s and forecast to arrive on Sunday (Jul 26) 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 26th Jul) | 3.5ft (1.1m) 18s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
G’day, it’s Rusty, and here’s the outlook for Ammonias. I’ll lay it out plain – there’s nothing in the 16-day window that’s gonna get you stoked. The whole stretch is a fight, with mostly cross-shore or cross-onshore winds and a lot of chop. The first few days are a total write-off with poor surf conditions. The swell does try to build later, but it’s always fighting the wind. The best you’ll get is a marginal, messy wave, and even that’s a hard sell.
We’re talking about a reef break, and it’s fairly consistent, but it’s exposed to the swell. The optimum swell direction is from the SSE, but we’re not seeing that at all. The water temperature is about average for this time of year.
The first real chance is Tuesday, 21 July. The morning brings a 3-foot swell from the south with a long 15-second period, which is a groundswell. The combined energy is moderate (593). That period is long enough to make paddling out easier, but at a reef, it could work. The problem is the wind is still cross-shore from the ENE at 12 mph, so it’s a bit messy. It’s a marginal call.
The next little window is Wednesday, 22 July through to Thursday, 23 July. The swell drops to 2 feet from the SSW, but with a very long period of 20-24 seconds. The energy is moderate to strong (865 to 1117). That period is so long, it’s best for a reef or point break, but the size is tiny. Winds are still cross-shore from the ENE at 16 mph, and the water is lumpy. It’s marginal at best.
Friday, 24 July is the only day a week in that has a bit of a pulse. The afternoon shows a 7-foot swell from the ENE, but it’s a short-period 7-second windswell. The energy is strong (1183), but the wind is cross-shore from the NE at 16 mph, creating a lumpy cross-chop. That 7-foot is too big for beginners, and with the short period and messy wind, it’s not a classic. This is the best on offer, but it’s a “maybe” for the die-hards.
From Saturday, 26 July onwards, things settle into a long run of 3 to 4-foot swells from the SSW and then the E. The periods are long (14-16 seconds), so the energy is moderate to strong (1015-1499). The wind stays stubbornly cross-shore from the ENE or NE at 12-16 mph, so the surf is always a bit bumpy. The best of the second week is Monday, 27 July morning, with a 4-foot swell from the east at 16 seconds, but it’s still cross-shore.
The last few days of the month and into August are a repeat of the same – 4 to 5-foot swells, cross-shore winds, and marginal conditions. The Friday, 31 July afternoon has a 5-foot swell from the ENE, but with a short 7-second period, it’s just a messy windswell. The combined energy is moderate (565), but it’s not worth the drive.
Honestly, there’s no standout session here. The whole period is a bit of a drought. The best call is to look at the Friday, 24 July afternoon for the biggest push of swell, but it’s a short-period, wind-affected mess. If you’re a kitesurfer, that cross-shore wind and chop might look fun, but for a paddle surfer, it’s a rough ride. Otherwise, keep an eye on the forecast, because it tends not to stay this poor for long.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Sun morning, min 23°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 5mm), mostly falling on Tue night. Warm (max 26°C on Wed afternoon, min 24°C on Tue night). Wind will be generally light. | ||||||||||||||||||
Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | ||||||||||||||
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 7 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | S 15 | S 14 | S 13 | SSW 24 | SSW 23 | SSW 22 | SSW 20 | ENE 7 | SSW 18 | SSW 18 | ENE 7 | ENE 8 |
Wave Graph | |||||||||||||||||||
365 | 264 | 223 | 207 | 199 | 214 | 198 | 343 | 316 | 285 | 437 | 426 | 480 | 528 | 399 | 469 | 448 | 415 | 481 | |
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-on | cross-on | cross-on | cross | cross-on | cross | cross | cross | cross | cross | cross |
High Tide | 8:26AM0.35m | 7:13PM0.43m | 9:50AM0.41m | 7:25PM0.35m | 11:06AM0.46m | 12:06PM0.52m | 12:55PM0.57m | 1:36PM0.61m | 00:21AM0.18m | ||||||||||
Low Tide | 1:46AM0.05m | 1:11PM0.23m | 2:18AM0.05m | 2:53PM0.29m | 2:52AM0.04m | 3:30AM0.04m | 4:16AM0.04m | 5:07AM0.04m | 10:06PM0.17m | ||||||||||
— | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | |
7:22 | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:21 | — | — | 7:21 | — | — | 7:21 | — | |
mm | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | 1 | 2 | — | — | 1 |
Temp °C | 25 | 26 | 26 | 24 | 26 | 26 | 24 | 26 | 26 | 25 | 25 | 26 | 24 | 25 | 25 | 24 | 25 | 26 | 24 |
Feels °C | 25 | 26 | 25 | 23 | 25 | 25 | 23 | 26 | 26 | 24 | 24 | 25 | 23 | 24 | 23 | 23 | 23 | 24 | 22 |
Swell 1 Height (m) Direction Period (s) | SE 8 | S 12 | S 13 | SSW 11 | SSW 12 | S 16 | S 12 | S 15 | S 14 | S 13 | S 14 | SSW 23 | S 13 | SSW 20 | SSW 20 | SSW 18 | SSW 18 | SSW 17 | SSW 16 |
58 | 113 | 125 | 73 | 75 | 188 | 108 | 343 | 316 | 285 | 311 | 426 | 212 | 528 | 399 | 469 | 448 | 340 | 302 | |
Swell 2 Height (m) Direction Period (s) | S 12 | SSE 8 | SSE 7 | S 18 | S 16 | SSW 10 | S 15 | SW 17 | SW 16 | SSW 26 | SSW 24 | S 13 | SSW 22 | S 13 | S 13 | E 11 | S 12 | S 12 | S 20 |
75 | 45 | 18 | 162 | 137 | 60 | 165 | 73 | 65 | 224 | 437 | 173 | 480 | 206 | 157 | 86 | 145 | 102 | 400 | |
Swell 3 Height (m) Direction Period (s) | W 12 | W 12 | S 19 | SE 6 | SE 8 | S 13 | SSW 16 | SSW 11 | E 15 | SE 6 | E 12 | E 12 | E 12 | E 12 | SSW 16 | S 13 | SE 13 | S 21 | S 12 |
26 | 25 | 113 | 9 | 18 | 29 | 105 | 24 | 38 | 9 | 73 | 103 | 106 | 144 | 175 | 85 | 28 | 326 | 98 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 7 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 8 |
365 | 264 | 223 | 207 | 199 | 214 | 198 | 153 | 166 | 187 | 192 | 163 | 276 | 239 | 384 | 329 | 392 | 415 | 481 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 16 | 31 | 16 | 16 | 31 | 16 | 16 | 31 | 31 | 16 | 31 | 31 | 16 | 31 | 33 | 16 | 33 | 31 | 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










