Surf Forecasts:
Ammonias surf forecast from 9 Jul 2026:
- Most powerful swell: Thursday 9 Jul, 2AM (local time) - 7.5ft (2.3m), 8s period, ENE swell with 621 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 2.3m 8s and forecast to arrive on Thursday (Jul 09) at 2AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 15s period and expected on Wednesday (Jul 15) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Thu 9th Jul) | 7.5ft (2.3m) 8s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
Alright folks, Rusty here. Let’s get into it. We’ve got a 16-day outlook for Ammonias, and I’ll be straight with you – it’s a tough stretch. The swell is coming in from the ENE, which is not the optimum direction for this spot. We’re looking at a solid run of poor surf conditions for the first week and a half, with clean waves being a rare luxury.
The combined swell energy is mostly moderate, sitting in the 700-800 range (744-842), but it’s all short-period, choppy windswell. The wind is a constant problem, with ENE breezes blowing 15-19 mph, keeping things lumpy and cross-shore at best. Water temp is sitting at 79°F, which is pretty much normal for this time of year, so no worries there.
The first real glimmer of hope appears on Saturday, July 18th. The afternoon shows a jump in swell to 10 ft from the ENE with a period of 9 seconds. The combined energy hits 1722 – that’s strong wave energy. The wind also swings cross-shore, which is a big improvement. The commentary even calls it “marginal” instead of “poor,” which is something. At 10 ft, this is expert territory only. It’s big, powerful, and the direction is still not ideal, but it’s the best of a bad bunch.
The next day, Sunday the 19th, still has some size at 8 ft, but the wind turns back onshore, spoiling it. After that, the swell drops and the winds stay frustrating. We see a long-period groundswell from the south on Tuesday the 21st (3 ft, 15s), and a bit of east swell on the 22nd (3 ft, 16s), but both are small and the wind is still messy. Long-period swells can be great at a reef like Ammonias, but with these sizes and the constant cross-breeze, it’s hard to get excited.
So, the standout? Saturday, July 18th afternoon. It’s the only real window of opportunity, and it’s a big one. If you’re an expert and you can handle 10 ft, lumpy, cross-shore surf, that’s your shot. The rest of the window is a write-off for paddle surfing. Honestly, the setup looks more interesting for kite surfing than paddle surfing for most of this period.
Rusty.
Short Range ForecastModerate rain (total 15mm), heaviest on Wed night. Warm (max 26°C on Thu afternoon, min 24°C on Wed night). Mainly fresh winds. | Days 5-7 Weather SummaryModerate rain (total 14mm), heaviest on Sun night. Warm (max 25°C on Sat afternoon, min 23°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Wed 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | |||||||||||||||
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 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | SSW 17 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 481 | 621 | 536 | 422 | 456 | 340 | 330 | 336 | 456 | 379 | 386 | 369 | 471 | 572 | 439 | 389 | 390 | 327 | 294 | 456 | 428 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross | cross-on | cross-on |
High Tide | 8:28PM0.28m | 12:45PM0.59m | 9:34PM0.22m | 1:33PM0.67m | 11:46PM0.18m | 2:19PM0.73m | 1:06AM0.18m | 3:04PM0.77m | 2:08AM0.19m | 3:47PM0.78m | 3:04AM0.21m | 4:29PM0.77m | 3:58AM0.23m | ||||||||
Low Tide | 6:49PM0.27m | 4:28AM-0.03m | 9:16PM0.22m | 5:17AM-0.06m | 9:34PM0.17m | 6:09AM-0.08m | 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 | |||||||
 |  | | | |  | | | | |  | | | | | | | | | | | |
 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 |
 | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:22 | — | 7:22 |
mm | 1 | 5 | 4 | 2 | 1 | — | — | 2 | — | — | — | 1 | 2 | 4 | — | 1 | 4 | 2 | 2 | 4 | 3 |
Temp °C | 25 | 24 | 25 | 26 | 24 | 25 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 25 | 25 |
Feels °C | 23 | 22 | 24 | 25 | 23 | 24 | 25 | 24 | 23 | 23 | 24 | 24 | 24 | 23 | 23 | 23 | 22 | 24 | 24 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | S 13 | S 12 | S 12 | S 12 | S 12 | S 11 | SW 19 | SSW 18 | SW 18 | SSW 17 | SSW 16 | SSW 16 | SW 16 | SSW 15 | SSW 14 | SW 14 | SW 14 | SW 14 | W 15 | W 15 |
| kJ | 239 | 168 | 151 | 108 | 106 | 98 | 66 | 184 | 214 | 316 | 386 | 326 | 322 | 353 | 279 | 268 | 206 | 189 | 186 | 298 | 291 |
Swell 2 Height (m) Direction Period (s) | SE 8 | SE 8 | SE 8 | SE 8 | W 13 | W 13 | W 13 | S 11 | W 14 | S 12 | SSE 13 | SSE 12 | SSE 12 | SSE 12 | W 19 | W 18 | W 17 | W 16 | W 16 | SSW 13 | SW 13 |
| kJ | 18 | 11 | 11 | 31 | 30 | 28 | 55 | 61 | 61 | 44 | 54 | 51 | 49 | 48 | 112 | 150 | 140 | 257 | 248 | 109 | 162 |
Swell 3 Height (m) Direction Period (s) | S 18 | W 15 | W 14 | W 14 | S 15 | W 15 | SE 9 | W 14 | S 11 | W 13 | SE 8 | W 12 | W 12 | W 12 | SSE 12 | SSE 11 | SSE 11 | SSW 19 | SW 19 | SSW 17 | SSW 18 |
| kJ | 6 | 17 | 15 | 32 | 17 | 38 | 19 | 59 | 39 | 54 | 25 | 26 | 26 | 26 | 46 | 50 | 24 | 146 | 93 | 200 | 123 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
| kJ | 481 | 621 | 536 | 422 | 456 | 340 | 330 | 336 | 456 | 379 | 362 | 369 | 471 | 572 | 439 | 389 | 390 | 327 | 294 | 456 | 428 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 33 | 38 | 38 | 126 | 16 | 16 | 31 | 33 | 31 | 33 | 16 | 31 | 33 | 38 | 31 | 33 | 16 | 31 | 16 | 38 | 33 |
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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