Surf Forecasts:
Ammonias surf forecast from 11 Jul 2026:
- Most powerful swell: Sunday 12 Jul, 11AM (local time) - 7ft (2.1m), 7s period, ENE swell with 475 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 7s and forecast to arrive on Sunday (Jul 12) at 11AM. Winds are predicted to be cross-onshore 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 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Sun 12th Jul) | 7ft (2.1m) 7s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
Alright, let’s talk about this stretch in terms you can feel. Truth is, it’s a grim outlook for Ammonias. The first half of the 16-day window is a total bust – you’d be better off staying on the beach. There’s a massive gap of dead days, and it’s not until the very tail end that anything halfway decent shows up.
Right from the start, Saturday the 11th and Sunday the 12th are blown out. Swell’s around 6.6 ft out of the ENE, but it’s all windswell with a short period, and the winds are howling at 15-19 mph cross-shore. The combined energy is moderate (653 to 888), but it’s lumpy, messy, and not worth your time. Monday the 13th is barely any better – still a lot of chop and short-period junk.
Then it all goes quiet. From Tuesday the 14th all the way through to around Wednesday the 22nd, it’s either tiny or terrible. There’s a tease of very long-period groundswell from the SSW (14-18 seconds) on the 14th-16th, but it’s just 2 ft – all that energy (229 to 487) with no height. You’ll see lines but nothing to ride. The wind is a constant problem, mostly cross-shore to cross-onshore from the ENE at 12-19 mph.
Your one and only hope is the very end. Saturday the 25th and Sunday the 26th bring a pulse of 5.2-5.6 ft ENE swell. The period is still a bit short at 7 seconds, but the wind is looking much better – light breezes from the NE and east at around 9 mph. That’s a near-glassy setup. The combined energy is moderate (592 to 692), so there’s some push. It’s still a cross-shore angle, but with the light wind, it’ll be the cleanest the place has been in weeks. The swell direction is off the optimum SSE, but for this spot, a clean 5 ft wave will be rideable.
Ammonias (this region) is a reef break, which will help give the short-period swell some shape. Crowds are likely, especially on that Saturday. This is the only real standout in the whole 16-day run. The first week is a write-off. The second week, especially that last weekend, is your shot. Don’t hold your breath for anything before that. Forecasts can change, but right now, it’s a long haul to a small window.
Short Range ForecastModerate rain (total 14mm), heaviest on Sun morning. Warm (max 25°C on Sat morning, min 23°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 16mm), heaviest on Wed night. Warm (max 26°C on Wed afternoon, min 23°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | |||||||||||||||
AM | 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) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | SW 14 | ENE 8 | ENE 8 | SW 13 | SSW 18 | SSW 16 | SSW 16 | SSW 17 | SSW 14 | ENE 6 | SSW 16 | ENE 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 449 | 387 | 359 | 475 | 447 | 447 | 411 | 314 | 236 | 189 | 257 | 200 | 162 | 216 | 314 | 179 | 195 | 180 | 121 | 196 | 192 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross | cross |
High Tide | 2:19PM0.73m | 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 | ||||||||
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 | ||||||||
 | |  | | | |  |  | | | |  | | | | | |  | | | | |
 | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — |
 | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — |
mm | 1 | 1 | 3 | 3 | 1 | 3 | — | — | 2 | 3 | — | — | 1 | 3 | 9 | — | — | — | — | — | — |
Temp °C | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 24 | 24 | 23 | 25 | 24 | 23 | 23 | 23 | 23 | 24 | 24 | 24 | 25 | 27 | 26 | 27 | 27 | 25 | 26 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | SSW 18 | SW 18 | SW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SW 14 | SW 14 | NE 7 | SW 14 | W 15 | W 15 | W 15 | NE 7 | W 14 | W 14 | SSW 14 | W 14 | SSW 16 | SSW 13 |
| kJ | 214 | 316 | 309 | 326 | 322 | 310 | 283 | 214 | 206 | 126 | 186 | 298 | 287 | 279 | 176 | 203 | 200 | 180 | 140 | 196 | 141 |
Swell 2 Height (m) Direction Period (s) | W 14 | W 13 | SE 9 | SSE 13 | SSE 12 | SSE 12 | W 19 | W 18 | W 17 | E 8 | W 16 | SSW 13 | SW 13 | NNE 8 | SSW 16 | SSW 16 | SSW 13 | W 14 | SSE 8 | W 14 | W 13 |
| kJ | 61 | 54 | 26 | 53 | 48 | 48 | 112 | 150 | 142 | 94 | 248 | 109 | 162 | 66 | 314 | 179 | 113 | 198 | 40 | 134 | 87 |
Swell 3 Height (m) Direction Period (s) | SE 9 | SE 8 | S 13 | W 12 | W 12 | SE 8 | SSE 12 | SSE 11 | SE 7 | SW 14 | SW 19 | SSW 17 | NNE 7 | SSW 18 | W 15 | SSW 13 | SSW 17 | SSE 8 | SSW 12 | SSE 8 | SE 8 |
| kJ | 12 | 25 | 51 | 26 | 26 | 24 | 46 | 50 | 12 | 189 | 93 | 200 | 29 | 216 | 272 | 113 | 195 | 44 | 81 | 45 | 22 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | — | ENE 8 | ENE 8 | ENE 8 | ENE 7 | SE 6 | NE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 6 |
| kJ | 449 | 387 | 359 | 475 | 447 | 447 | 411 | 314 | 236 | — | 257 | 187 | 138 | 118 | 9 | 119 | 142 | 115 | 121 | 160 | 192 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 31 | 33 | 16 | 33 | 33 | 16 | 31 | 31 | 16 | 16 | 16 | 16 | 45 | 31 | 16 | 31 | 16 | 31 | 38 | 38 |
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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