
Surf Forecasts:
Ammonias surf forecast from 8 Jul 2026:
- Most powerful swell: Thursday 9 Jul, 5AM (local time) - 8ft (2.4m), 8s period, ENE swell with 672 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 2.4m 8s and forecast to arrive on Thursday (Jul 09) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 8s period and expected on Sunday (Jul 12) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Thu 9th Jul) | 8ft (2.4m) 8s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
Alright, Rusty here. Let’s have a look at what’s on the table for Ammonias over the next couple of weeks.
Straight up, this is a tough outlook. For the first ten days, the wind is locked in from the ENE, blowing cross or cross-on, and that’s keeping things messy. We’ve got moderate to fresh breezes kicking up lumpy, choppy conditions, and the swell is mostly short-period windswell. You’re looking at a combined swell energy in the moderate range, values between 440 and 830 through that stretch, but with the poor quality, it’s not bringing any smiles. There’s a brief window on Sunday the 12th afternoon where a long-period 16-second S swell shows up at 3 ft, but it’s crossed up with a fresh ENE breeze, so it’s not clean.
The first real highlight comes a bit later. From the 19th of July, things start to shift. The wind is still cross from the ENE, but the swell turns more southerly with longer periods. On Sunday the 19th, both morning and afternoon, we see a clean 3 ft, 15 to 16-second groundswell out of the south. The combined energy is solid moderate, around 750 to 785. That’s the best wave shape you’ll see in the whole run – proper lines, decent push, and manageable size. For an intermediate, this is the standout of the fortnight.
There’s another day worth a look on Monday the 20th: same south groundswell, 3 ft with 14 seconds, energy around 604 to 638. The wind is still cross from the ENE, but it’s not as strong, so the chop might be a little less offensive. Tuesday the 21st morning also offers a 3 ft south swell at 13 seconds, energy 628, but again, cross-shore wind.
After that, the swell drops off again and the wind stays onshore, so don’t hold your breath for the last few days. The water temperature anomaly isn’t mentioned, so let’s just say it’s around the seasonal normal.
Overall, this is not a banner period. The first week and a half is mostly a write-off for paddle surfing. The one true standout is the 19th and 20th of July, with that long-period south groundswell offering the cleanest, most surfable waves. It’s not huge, but it’s the best you’ll get. For the rest, you’d be better off with a kite if you’ve got one, because the wind and swell combo at Ammonias is more suited to that than a surfboard.
Rusty.
Short Range ForecastHeavy rain (total 23mm), heaviest during Thu morning. Warm (max 26°C on Fri afternoon, min 24°C on Tue night). Mainly fresh winds. | Days 5-7 Weather SummaryModerate rain (total 19mm), heaviest on Fri night. Warm (max 25°C on Sat morning, min 24°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tue 14 | |||||||||||||||
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 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | SSW 17 | ENE 8 | SW 16 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 8 | ENE 7 |
Wave Graph | |||||||||||||||||||||
469 | 509 | 481 | 604 | 620 | 451 | 469 | 415 | 379 | 469 | 417 | 344 | 397 | 408 | 367 | 581 | 459 | 331 | 353 | 288 | 294 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross | cross | cross | cross | cross |
High Tide | 8:03PM0.35m | 11:53AM0.50m | 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 | |||||||
Low Tide | 3:45AM-0.01m | 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 | ||||||||
— | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | |
7:23 | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:22 | |
mm | 2 | 2 | 2 | 4 | 4 | 3 | 2 | 2 | 2 | 5 | — | — | 1 | 2 | 2 | 7 | 1 | 1 | 6 | 2 | — |
Temp °C | 24 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 |
Feels °C | 22 | 23 | 23 | 24 | 24 | 24 | 24 | 24 | 25 | 23 | 24 | 23 | 23 | 24 | 24 | 23 | 24 | 24 | 23 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 14 | SSW 13 | S 13 | S 12 | S 12 | S 12 | S 12 | S 11 | SW 19 | SSW 18 | SW 18 | SSW 17 | SW 16 | SW 16 | SW 16 | SSW 15 | SSW 14 | SW 14 | SW 14 | SW 14 |
261 | 247 | 239 | 168 | 112 | 108 | 106 | 99 | 66 | 184 | 214 | 316 | 386 | 371 | 367 | 353 | 279 | 268 | 206 | 189 | 186 | |
Swell 2 Height (m) Direction Period (s) | SSE 8 | SE 9 | SE 9 | SE 8 | SE 8 | SE 6 | SE 8 | W 14 | W 13 | S 11 | S 12 | SE 8 | S 13 | SSE 12 | SE 8 | SSE 12 | SE 8 | W 18 | W 17 | W 16 | W 16 |
7 | 12 | 19 | 11 | 11 | 9 | 14 | 65 | 55 | 61 | 44 | 25 | 51 | 51 | 25 | 28 | 24 | 155 | 147 | 190 | 248 | |
Swell 3 Height (m) Direction Period (s) | SE 10 | W 16 | S 18 | W 15 | W 14 | SE 8 | W 13 | SSE 8 | SW 20 | W 14 | W 14 | S 12 | SE 8 | W 12 | SSE 12 | SE 8 | SSE 12 | SSE 11 | SSE 11 | SSW 19 | SE 11 |
4 | 5 | 6 | 17 | 15 | 10 | 30 | 6 | 101 | 59 | 61 | 44 | 24 | 26 | 48 | 11 | 46 | 43 | 47 | 146 | 29 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | NE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 8 | ENE 7 |
469 | 509 | 481 | 604 | 620 | 451 | 469 | 415 | 379 | 469 | 417 | 344 | 397 | 408 | 450 | 581 | 459 | 331 | 353 | 288 | 294 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 31 | 33 | 16 | 33 | 126 | 16 | 31 | 31 | 31 | 31 | 31 | 31 | 16 | 33 | 16 | 16 | 31 | 16 | 16 | 16 |
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











