
Surf Forecasts:
Ammonias surf forecast from 3 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 5AM (local time) - 23ft (7.0m), 15s period, S swell with onshore winds.
- Most powerful swell: Tuesday 8 Sep, 8AM (local time) - 36ft (11.0m), 14s period, S swell with 49,542 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 5AM (local time) - 23ft (7.0m), 15s period with S swell.
Best Forecast Surf Conditions for Ammonias this week:
The surf forecast for Ammonias over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 08) at 5AM. The primary swell is predicted to be 7.0m and 15s period with a secondary swell of 4.5m and 9s. The wind is predicted to be onshore as the swell arrives.
The most powerful waves expected at Ammonias in the next 16 days are 11.0m 14s and forecast to arrive on Tuesday (Sep 08) at 8AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 9s period and expected on Wednesday (Sep 09) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Tue 8th Sep) | 23ft (7.0m) 15s |
| Best Surf | 5AM (Tue 8th Sep) | 23ft (7.0m) 15s |
| Most Powerful | 8AM (Tue 8th Sep) | 36ft (11.0m) 14s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
G’day, I’m Rusty. Let’s break down what’s on the cards at Ammonias over the next couple of weeks.
Right from the start, the first few days are nothing to write home about. Wednesday the 2nd and Thursday the 3rd have cross-shore winds around 25 km/h and surf running about 7 ft, but there’s a messy cross-chop on the surface. The combined swell energy’s in the moderate range (949 to 1386), but the quality’s lacking – it’s a bit of a wrestle out there. Water temp’s 81°, which is about average for this time of year.
Friday the 4th through Sunday the 6th are more of the same: wave heights between 5 ft and 7 ft, but the wind’s still cross or cross-on, and the reports keep calling it marginal. The energy climbs into moderate territory (1152 to 1775), but it’s not clean enough to get stoked about. Monday the 7th sees the swell bump up to 8 ft with a longer period (14 seconds), and the energy hits the strong range (4690 to 5815), but the wind’s still cross and it’s labelled marginal – a bit of a tease.
Now, Tuesday the 8th is the big one, but only for the hardcore. The morning brings a massive 31 ft swell from the south with a 13-second period and a cross-onshore near gale of 34 mph. The combined energy is extreme (31474), but the report flat out says it’s too big for this break. That’s expert-only territory, and it’s blown out. The afternoon drops to 13 ft but the wind’s still cross and messy. Not a day for a paddle; might be interesting for kiting though.
After that, things settle down. Wednesday the 9th has a 5 ft swell with cross-on wind, Thursday the 10th is small and choppy, and the energy falls off (532 to 619). Friday the 11th shows a slight bump to 6 ft with a 13-second period and cross-on breeze – still not clean. The energy’s moderate (1328), but the wind’s not playing nice.
From Saturday the 12th onward, it’s pretty flat. Waves drop below 3 ft by Monday the 14th, and the energy gets weak (94 to 233). The second week is a dud for decent surf – small, cross-wind, and mostly poor conditions. Even the longer-period swells (up to 21 seconds on the 15th) are tiny, so there’s no power.
The only real standout is Tuesday the 8th morning, but that’s a huge, dangerous swell with howling wind – not for the average surfer. If you’re an expert chasing a wild one, it’s worth a look, but don’t expect it to be clean. The rest of the window is pretty forgettable.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Wed afternoon. Warm (max 26°C on Wed afternoon, min 24°C on Thu night). Mainly fresh winds. | Days 5-7 Weather SummaryHeavy rain (total 95mm), heaviest during Mon night. Warm (max 26°C on Sat afternoon, min 23°C on Mon morning). Winds increasing (light winds from the ESE on Sun night, severe gales from the SE by Mon night). | |||||||||||||||||||
Wed 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | ||||||||||||||
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 8 | ENE 8 | ENE 8 | SE 13 | SSE 12 | SSE 12 | SSE 11 | SSE 12 | S 12 | S 12 | ENE 13 | ENE 13 | SSW 13 | ENE 12 | SSW 14 | ENE 13 | SSW 15 | S 13 | SW 9 | S 9 |
Wave Graph | ||||||||||||||||||||
487 | 486 | 507 | 734 | 626 | 477 | 428 | 514 | 639 | 722 | 1679 | 1605 | 1445 | 1511 | 2536 | 2991 | 11445 | 30466 | 2989 | 588 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross | cross | cross-on | cross-on | cross | cross |
High Tide | 5:17PM0.30m | 9:35AM0.57m | 10:57AM0.61m | 12:04PM0.65m | 11:37PM0.20m | 12:57PM0.68m | 00:45AM0.25m | 1:42PM0.69m | 1:36AM0.30m | 2:20PM0.68m | 2:21AM0.36m | |||||||||
Low Tide | 3:05PM0.29m | 1:01AM0.04m | 2:01AM0.05m | 3:24AM0.06m | 8:23PM0.17m | 8:30PM0.15m | 6:02AM0.04m | 8:46PM0.13m | 7:02AM0.02m | 9:05PM0.11m | ||||||||||
— | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — | |
6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | |
mm | 3 | 1 | — | — | 1 | 1 | — | — | — | 1 | 3 | 1 | 2 | 11 | 15 | 6 | 48 | 8 | 2 | 1 |
Temp °C | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 23 | 24 | 26 | 26 | 26 | 26 |
Feels °C | 26 | 25 | 25 | 24 | 23 | 23 | 23 | 23 | 25 | 25 | 24 | 25 | 25 | 24 | 23 | 23 | 20 | 17 | 23 | 26 |
Swell 1 Height (m) Direction Period (s) | S 16 | S 15 | SE 13 | SE 13 | SSE 12 | SSE 12 | SSE 11 | SSE 12 | S 12 | S 12 | S 12 | SSW 12 | SSW 13 | SSW 13 | SSW 14 | SSW 14 | SSW 15 | ENE 11 | ENE 10 | ENE 9 |
406 | 352 | 480 | 734 | 626 | 477 | 401 | 514 | 639 | 722 | 933 | 992 | 1445 | 1511 | 2536 | 2991 | 11445 | 1008 | 543 | 248 | |
Swell 2 Height (m) Direction Period (s) | SSE 10 | SE 13 | S 14 | S 14 | S 13 | E 14 | E 14 | E 14 | E 14 | E 14 | N 11 | SE 10 | SSE 10 | SSE 9 | NW 14 | SSE 9 | NW 12 | — | SSW 15 | WNW 9 |
31 | 176 | 268 | 189 | 130 | 196 | 289 | 401 | 561 | 631 | 9 | 47 | 63 | 98 | 7 | 181 | 37 | — | 381 | 238 | |
Swell 3 Height (m) Direction Period (s) | S 12 | S 11 | E 13 | E 13 | E 12 | SSW 13 | SSW 13 | SSW 20 | SSW 18 | SSW 18 | — | SSW 20 | E 16 | S 18 | NNW 14 | NNW 13 | — | — | E 14 | SSW 14 |
25 | 58 | 85 | 80 | 109 | 60 | 34 | 37 | 121 | 121 | — | 76 | 21 | 248 | 18 | 17 | — | — | 106 | 356 | |
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 13 | ENE 13 | ENE 12 | ENE 12 | E 13 | ENE 13 | ENE 8 | S 13 | SW 9 | S 9 |
487 | 486 | 507 | 383 | 485 | 456 | 428 | 379 | 353 | 301 | 1679 | 1605 | 1438 | 1493 | 2154 | 2643 | 2857 | 30466 | 2989 | 588 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 33 | 16 | 31 | 31 | 16 | 31 | 31 | 16 | 31 | 31 | 16 | 31 | 38 | 126 | 118 | 31 | 297 | 324 | 33 | 32 |
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










