
Surf Forecasts:
Ammonias surf forecast from 12 Jul 2026:
- Most powerful swell: Sunday 12 Jul, 11PM (local time) - 7ft (2.1m), 8s period, ENE swell with 501 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 2.1m 8s and forecast to arrive on Sunday (Jul 12) at 11PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 8s period and expected on Tuesday (Jul 14) at 8AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11PM (Sun 12th Jul) | 7ft (2.1m) 8s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
Hey folks, Rusty here. Let’s be straight up – this 16-day window for Ammonias is a real grind. We’re looking at a long stretch of onshore and cross-shore winds that just won’t let up, and the swell is mostly weak and messy. There’s no standout, no real gem hiding in here. The best you can hope for is a few marginal sessions, but nothing that’ll get the heart racing.
The first week is a total write-off. Sunday the 12th kicks off with a rain shower and a strong 19 mph cross-onshore wind, making a lumpy mess of a 7 ft swell from the ENE. The combined energy hits 879 (moderate), but with that wind and short 7-second period, it’s just a choppy, poor surf situation. Monday and Tuesday are more of the same – cross-shore winds, lumpy chop, and swell dropping fast. By Wednesday the 15th, the swell is tiny at 2 ft, and even though that period stretches to 15 seconds, the cross-onshore wind keeps it ugly. This pattern holds through the rest of the first week: moderate cross-onshore winds, weak swell, and a “poor surf conditions” label on every session. There’s a slight uptick on Friday the 17th with 5 ft from the ENE, but the wind is still cross-on, killing any chance of quality.
Heading into the second week, things don’t really improve. Sunday the 19th and Monday the 20th bring a bit more swell energy – 5 ft then 6 ft – but again, the wind is cross or cross-on, and the waves are just not clean. The combined energy hits 556 and 635 (moderate), but the “marginal surf forecast” label says it all. Around Wednesday the 22nd, we start seeing some long-period SSW groundswell (24 seconds!), but it’s tiny – only 2 ft to 2 ft. The combined energy jumps to 953 then 1020 (strong), but with the wind still cross-on, it’s just a clean-looking swell that gets wrecked. The rest of the week into the 27th shows a slow build of S and SSW swells, with periods between 15 and 20 seconds and combined energy in the 1000s (strong to very strong), but the wind is always cross or cross-on – never offshore. The water temp is about average for this time of year, so no surprises there.
Honestly, if you’re desperate for a paddle, the best chance might be on Thursday the 24th afternoon or Friday the 25th, when the swell is 3 ft to 4 ft from the SSW, period around 18-20 seconds, and the wind is cross-shore with a moderate breeze. The combined energy is strong (1148 and 1496), but it’s still a marginal, lumpy cross-chop. Not worth a special trip. For a reef break that’s fairly consistent and exposed to SSE swells, we’re getting nothing that matches that optimum direction – the swell is from ENE, S, and SSW, which is a poor fit. Crowds are often an issue here, but with conditions this poor, you’ll probably have it to yourself.
This is a blank run, plain and simple. For an area like this, it’s not unusual – sometimes the forecasts just line up wrong. Keep an eye on the long-range, but don’t hold your breath.
Rusty
Short Range ForecastModerate rain (total 15mm), heaviest on Mon night. Warm (max 25°C on Sat night, min 23°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 13mm), heaviest on Tue night. Warm (max 26°C on Wed afternoon, min 24°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Sat 18 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | SW 14 | SW 14 | ENE 8 | SW 13 | SSW 15 | SSW 16 | SSW 16 | ENE 7 | SSW 14 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | SSW 14 |
Wave Graph | |||||||||||||||||||||
405 | 475 | 447 | 459 | 358 | 280 | 242 | 189 | 186 | 240 | 162 | 146 | 314 | 179 | 120 | 181 | 204 | 216 | 175 | 156 | 210 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross |
High Tide | 1:06AM0.18m | 3:04PM0.77m | 2:08AM0.19m | 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 | |||||||
Low Tide | 10:03PM0.14m | 7:03AM-0.10m | 10:34PM0.12m | 7:55AM-0.11m | 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 | |||||||
— | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | |
7:23 | — | 7:23 | — | — | 7:23 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | |
mm | 3 | 2 | 2 | 2 | — | — | 3 | 3 | — | 4 | 3 | — | 4 | 1 | — | — | 1 | — | — | — | — |
Temp °C | 25 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 26 |
Feels °C | 25 | 25 | 24 | 23 | 24 | 24 | 23 | 24 | 24 | 23 | 25 | 26 | 26 | 27 | 26 | 26 | 25 | 26 | 25 | 25 | 26 |
Swell 1 Height (m) Direction Period (s) | SW 17 | SSW 16 | SW 16 | SSW 16 | SSW 15 | SW 14 | SW 14 | SW 14 | SW 14 | W 15 | W 15 | W 15 | NE 7 | W 14 | W 14 | SSW 14 | SSE 7 | SSW 16 | SSW 10 | SSW 14 | SSW 14 |
309 | 326 | 367 | 310 | 283 | 214 | 206 | 189 | 186 | 298 | 287 | 279 | 167 | 203 | 203 | 180 | 36 | 196 | 92 | 156 | 210 | |
Swell 2 Height (m) Direction Period (s) | S 13 | SSE 13 | SSE 12 | SE 8 | W 19 | SSE 11 | W 17 | W 16 | W 16 | SSW 17 | SW 13 | NNE 8 | SSW 16 | SSW 16 | SSE 8 | W 14 | W 14 | SSW 12 | SE 7 | SW 9 | SE 8 |
51 | 53 | 49 | 23 | 112 | 50 | 142 | 257 | 251 | 200 | 162 | 63 | 314 | 179 | 59 | 146 | 142 | 88 | 44 | 41 | 14 | |
Swell 3 Height (m) Direction Period (s) | SE 8 | SE 8 | SE 8 | SSE 12 | SSE 12 | W 18 | SE 7 | SSW 19 | SE 6 | SSW 13 | NNE 8 | SSW 15 | W 15 | SSW 13 | SSW 13 | SSE 8 | SSW 12 | SSE 8 | S 14 | SE 8 | SW 8 |
25 | 25 | 25 | 48 | 46 | 150 | 16 | 146 | 9 | 109 | 33 | 146 | 272 | 113 | 113 | 32 | 94 | 37 | 132 | 28 | 18 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | NE 8 | NE 8 | ENE 8 | ENE 7 | ENE 7 | — | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
405 | 475 | 447 | 459 | 358 | 280 | 242 | 229 | 229 | 240 | 157 | 91 | — | 127 | 120 | 181 | 204 | 216 | 175 | 138 | 134 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 33 | 38 | 16 | 31 | 31 | 16 | 16 | 16 | 16 | 31 | 31 | 16 | 31 | 31 | 38 | 33 | 31 | 16 | 31 | 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











