
Surf Forecasts:
Ammonias surf forecast from 13 Jul 2026:
- Most powerful swell: Monday 13 Jul, 5AM (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 Monday (Jul 13) at 5AM. 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 | 5AM (Mon 13th Jul) | 7ft (2.1m) 8s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
Alright, it’s Rusty here. Let’s size up the next couple of weeks at our spot, Ammonias.
First thing you gotta know – this is going to be a rough run. The entire 16-day window is plagued by cross-shore and cross-onshore winds. We’re looking at a lot of chop, lumpy conditions, and poor surf quality almost every day. The water temperature is sitting at 79°F, which is spot on average for this time of year, so at least you won’t need a wetsuit.
There’s a real gap of poor conditions right from the start. On Sunday, July 12th, we’ve got 7 ft of short-period swell from the ENE (8 seconds) but it’s all messed up by a moderate cross-breeze. The combined swell energy is moderate at 901. The wave comment is "poor surf conditions" – don’t bother paddling out.
That theme continues straight through. Monday the 13th is a bit smaller at 6 ft, still short-period and cross-chop. Tuesday the 14th sees a tiny 2 ft pulse from the SW with a 14-second period, but again, the wind ruins it. The entire first week is just a write-off – cross-wind, cross-onshore, choppy, and never a clean moment.
Into the second week, things don’t improve much. Saturday the 19th has 6 ft of ENE swell with 7-second period – the combined energy hits 653, which is moderate, but the wind is still cross and the waves look messy. Sunday the 20th is similar but smaller. There’s a little flicker on Monday the 27th, where we get 6 ft of ENE swell with an 8-second period and a combined energy of 1211 – that’s strong – but again, the wind is cross-shore and the wave comment is only "marginal." It’s the closest thing to a standout, but honestly, it’s still a gamble with that chop.
Honestly, there’s no standout session here. Every day that has decent swell size (like the 6 ft to 7 ft days) is hammered by bad wind. The few times the period gets long (like 15–18 seconds on the 24th and 26th) the swell is tiny – only 2 ft to 3 ft. Not worth the effort.
If you’re desperate, the morning of Monday the 27th is the least terrible option – 6 ft from the ENE, 8 seconds, moderate cross-shore, and a score of 2 out of 10. But I wouldn’t call it good. It’s just not as bad as everything else.
Save your energy, mate. This forecast is a bust.
- Rusty
Short Range ForecastModerate rain (total 17mm), heaviest on Sun night. Warm (max 25°C on Sun afternoon, min 23°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Wed night. Warm (max 26°C on Wed afternoon, min 24°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sun 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | |||||||||||||||
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 8 | ENE 8 | ENE 8 | ENE 7 | SW 14 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | SW 16 | ENE 7 | SSW 13 | SSW 12 | SSW 11 | SSW 16 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | E 7 |
Wave Graph | |||||||||||||||||||||
468 | 459 | 373 | 288 | 242 | 189 | 257 | 213 | 178 | 131 | 251 | 204 | 257 | 429 | 245 | 196 | 149 | 219 | 387 | 394 | 303 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | 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-on | cross | cross-on | cross-on |
High Tide | 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 | 8:26AM0.35m | |||||||
Low Tide | 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 | 1:46AM0.05m | 1:11PM0.23m | |||||||
— | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | |
7:23 | — | — | 7:23 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | 7:22 | |
mm | 2 | 5 | — | — | 1 | 3 | 2 | 2 | 2 | — | 1 | 1 | — | 1 | — | — | — | 1 | — | — | 2 |
Temp °C | 25 | 24 | 25 | 25 | 24 | 24 | 25 | 24 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 |
Feels °C | 24 | 23 | 23 | 24 | 23 | 23 | 24 | 24 | 25 | 27 | 28 | 26 | 26 | 25 | 26 | 26 | 26 | 27 | 26 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SSW 16 | SSW 15 | SW 14 | SW 14 | SW 14 | SW 14 | W 15 | ENE 7 | ENE 7 | NNE 8 | W 14 | SSW 13 | SSW 12 | SSW 11 | SSW 10 | S 13 | SSW 14 | SSW 14 | SE 8 | SSW 12 |
367 | 310 | 283 | 214 | 206 | 189 | 186 | 298 | 178 | 131 | 78 | 203 | 257 | 429 | 245 | 131 | 130 | 207 | 210 | 57 | 117 | |
Swell 2 Height (m) Direction Period (s) | SSE 12 | SSE 12 | W 19 | W 18 | W 17 | W 16 | W 16 | SSW 17 | W 15 | W 15 | W 15 | SSE 8 | W 14 | SE 8 | SE 8 | SE 8 | SSW 8 | SE 9 | SSW 7 | S 12 | SE 8 |
49 | 48 | 112 | 150 | 142 | 257 | 251 | 200 | 287 | 279 | 272 | 59 | 203 | 57 | 59 | 59 | 55 | 39 | 21 | 72 | 25 | |
Swell 3 Height (m) Direction Period (s) | SE 8 | SE 8 | SSE 12 | SSE 11 | SE 7 | SE 7 | SE 6 | SSW 13 | SSW 13 | NNE 8 | SW 16 | SSW 13 | SSE 8 | W 14 | W 14 | SSW 16 | SSE 8 | SSW 8 | SE 8 | SW 7 | SE 7 |
17 | 16 | 46 | 43 | 12 | 21 | 10 | 109 | 140 | 68 | 251 | 114 | 52 | 146 | 142 | 196 | 39 | 33 | 35 | 12 | 14 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | NE 7 | ENE 8 | ENE 8 | — | — | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | E 7 |
468 | 459 | 373 | 288 | 242 | 268 | 257 | 213 | — | — | 77 | 204 | 230 | 257 | 186 | 158 | 149 | 219 | 387 | 394 | 303 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 33 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 31 | 14 | 16 | 31 | 31 | 46 | 31 | 31 | 16 | 31 | 31 | 16 | 31 |
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











