
Surf Forecasts:
Ammonias surf forecast from 14 Jul 2026:
- Most powerful swell: Sunday 19 Jul, 11AM (local time) - 6ft (1.8m), 8s period, ENE swell with 385 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 1.8m 8s and forecast to arrive on Sunday (Jul 19) 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 1.6m 7s period and expected on Tuesday (Jul 14) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Sun 19th Jul) | 6ft (1.8m) 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 the menu for Ammonias.
Honestly, mate, it’s a tough stretch ahead. The next couple of weeks look pretty grim, with a whole lot of poor conditions and not much to get excited about. The water’s sitting at 79°, which is pretty much bang on average for this time of year, so at least that’s not gonna be a shock.
We don’t really have any proper surf on offer until Monday the 13th of July, and even then it’s a bit of a struggle. The swell is small, only 3ft from the SSW with a long period of 14 seconds, which would be a decent groundswell if the wind wasn’t messing it up. But with a 25 km/h cross-shore NE wind, it’s just creating a messy cross-chop. The energy’s moderate at 574, but it’s not enough to salvage the day.
Tuesday the 14th is even worse, with both sessions scoring a zero. The swell drops and the wind stays onshore-angled from the ENE at 20 km/h. Wednesday the 15th sees a brief pulse of 4ft from the ENE early morning, but that period is a short 7 seconds and the wind is cross-onshore, making it choppy and useless. The rest of that week is more of the same—small, short-period junk in poor conditions.
The weekend of the 18th and 19th of July shows some size, with 6ft from the ENE on Saturday morning, but the period is still a weak 7 seconds and it’s cross-shore winds again. The energy is moderate, but the quality just isn’t there. Sunday the 19th is the same story, with a score of just 1 out of 10—marginal at best.
There’s a long gap of poor-to-marginal days right through until Tuesday the 28th of July. That morning finally shows a bit of promise. We’ve got a 5ft swell from the E with a 14-second period, and the wind is a light offshore from the SE—that’s a rare clean window. The energy jumps to 987, which is moderate but getting strong. It’s still only scored a 2 out of 10 due to tide concerns, but compared to the rest of the run, this is the standout.
Tuesday afternoon the 28th gets even bigger—7ft from the ENE, period 13 seconds, and the energy hits a strong 1463. The wind is light cross-onshore from the E, so it might be a bit bumpy, but for a reef break like Ammonias, that long-period groundswell and strong energy could produce some proper waves. This is the best on offer across the whole 16 days, but it’s a long way out, so treat it with some caution—forecasts can change.
Overall, if you’re desperate for a paddle, that Tuesday the 28th is your window. For the rest, it’s a whole lot of waiting.
Rusty.
Short Range ForecastModerate rain (total 14mm), heaviest on Wed night. Warm (max 26°C on Mon afternoon, min 23°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Thu night. Warm (max 26°C on Thu afternoon, min 24°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Mon 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | ENE 8 | ENE 7 | SW 14 | SW 14 | SSW 17 | ENE 7 | SSW 18 | SSW 16 | SSW 16 | SSW 17 | SSW 14 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 7 | ENE 6 | ENE 8 | ENE 8 | ENE 7 | ENE 7 |
Wave Graph | |||||||||||||||||||||
268 | 242 | 189 | 186 | 200 | 178 | 216 | 314 | 237 | 195 | 180 | 181 | 196 | 155 | 303 | 273 | 212 | 385 | 356 | 254 | 208 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 3:47PM0.78m | 3:04AM0.21m | 4:29PM0.77m | 3:58AM0.23m | 5:08PM0.73m | 4:55AM0.26m | 5:45PM0.67m | 5:57AM0.28m | 6:18PM0.59m | 7:07AM0.31m | 6:48PM0.51m | 8:26AM0.35m | 7:13PM0.43m | 9:50AM0.41m | |||||||
Low Tide | 11:06PM0.11m | 8:46AM-0.10m | 11:38PM0.10m | 9:34AM-0.07m | 00:10AM0.09m | 10:22AM-0.02m | 00:42AM0.08m | 11:11AM0.05m | 1:14AM0.06m | 12:04PM0.14m | 1:46AM0.05m | 1:11PM0.23m | 2:18AM0.05m | ||||||||
— | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | |
7:23 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | 7:22 | |
mm | — | 3 | — | — | — | — | 3 | 7 | 1 | — | 2 | — | — | — | — | — | 2 | — | — | 1 | 1 |
Temp °C | 26 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 24 | 25 | 25 | 24 | 24 |
Feels °C | 25 | 23 | 24 | 24 | 23 | 25 | 25 | 25 | 27 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 23 | 24 | 24 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SW 14 | SW 14 | SW 14 | W 15 | W 15 | W 15 | NE 7 | W 14 | W 14 | SSW 14 | W 14 | SSW 16 | SSW 13 | SSW 14 | SSW 14 | S 12 | S 12 | S 13 | S 11 | SSW 12 |
268 | 206 | 189 | 186 | 298 | 287 | 279 | 176 | 203 | 203 | 180 | 140 | 196 | 141 | 204 | 210 | 72 | 113 | 86 | 66 | 107 | |
Swell 2 Height (m) Direction Period (s) | W 18 | W 17 | W 16 | W 16 | SSW 13 | SW 13 | NNE 8 | SSW 16 | SSW 16 | SSW 13 | W 14 | NNE 8 | W 14 | W 13 | SE 8 | SE 9 | NNE 8 | SSW 8 | S 19 | SSE 18 | S 16 |
150 | 142 | 257 | 251 | 109 | 162 | 45 | 314 | 237 | 113 | 198 | 35 | 134 | 87 | 31 | 26 | 21 | 14 | 112 | 104 | 135 | |
Swell 3 Height (m) Direction Period (s) | SSE 11 | SE 7 | SSW 19 | SW 19 | SSW 17 | SSW 18 | SSW 18 | W 15 | SSW 13 | SSW 17 | NNE 8 | SSW 16 | SSE 7 | NNE 7 | WNW 13 | WNW 13 | SE 8 | W 12 | SE 9 | SW 19 | SE 8 |
43 | 11 | 146 | 93 | 200 | 123 | 216 | 272 | 113 | 195 | 32 | 100 | 21 | 20 | 56 | 56 | 18 | 25 | 13 | 92 | 18 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 7 | NE 7 | NE 8 | NE 8 | ENE 7 | ENE 7 | — | ENE 7 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 7 | ENE 6 | ENE 8 | ENE 8 | ENE 7 | ENE 7 |
263 | 242 | 268 | 229 | 204 | 178 | 132 | — | 127 | 113 | 144 | 181 | 175 | 155 | 303 | 273 | 212 | 385 | 356 | 254 | 208 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 16 | 16 | 16 | 16 | 31 | 15 | 31 | 31 | 31 | 33 | 31 | 31 | 16 | 31 | 16 | 16 | 16 | 16 | 16 | 16 |
Best forecast wave conditions in Kaua'i | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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











