
Surf Forecasts:
Ammonias surf forecast from 2 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 11AM (local time) - 21ft (6.5m), 16s period, S swell with onshore winds.
- Most powerful swell: Tuesday 8 Sep, 2PM (local time) - 28ft (8.5m), 14s period, S swell with 29,089 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 11AM (local time) - 21ft (6.5m), 16s 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 11AM. The primary swell is predicted to be 6.5m and 16s period with a secondary swell of 3.0m and 8s. The wind is predicted to be onshore as the swell arrives.
The most powerful waves expected at Ammonias in the next 16 days are 8.5m 14s and forecast to arrive on Tuesday (Sep 08) at 2PM. 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 Wednesday (Sep 09) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Tue 8th Sep) | 21ft (6.5m) 16s |
| Best Surf | 11AM (Tue 8th Sep) | 21ft (6.5m) 16s |
| Most Powerful | 2PM (Tue 8th Sep) | 28ft (8.5m) 14s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Right, let’s have a look at what’s heading our way for the next couple of weeks at Ammonias.
The first few days are a bit of a write-off, to be honest. We’re looking at a stretch from Wednesday the 2nd all the way through to Monday the 7th where the conditions are just messy. The wind is a persistent cross-shore, mostly around 15 to 18 mph, and the sea state is all lumpy and chopped up. The swell is there, but it’s not clean, and the scores are low. It’s not the time to get excited.
The real standout, and the one I’d circle on the calendar, is Tuesday the 8th. We’ve got a massive pulse of S swell pushing in – 21ft in the morning, jumping to 25ft in the afternoon. That’s a lot of water, with a 16-second period on the first part of the day, so it’s a proper groundswell. The combined energy is through the roof (22,354 in the morning, 20,329 in the afternoon). But here’s the thing – with that size, this is strictly for experts only. Anyone else needs to stay well clear. The wind on the morning of the 8th is a screaming onshore from the SSE at 43 mph, gusting to gale force, so that’s going to blow the surface out. The afternoon sees it drop to 22 mph, still cross-onshore, but the swell is even bigger. It’s a powerful, dangerous day. For most, this setup looks more interesting for kite surfing than paddle surfing.
After that, the swell drops away quickly. Wednesday the 9th has a small 6ft S swell, but the wind is still onshore and the conditions are choppy. The rest of that week and into the next is a lot of small, messy cross-shore windswell, with the odd pocket of cleaner conditions.
The best window for a decent, clean paddle comes on Sunday the 13th and Monday the 14th. On Sunday morning, we’ve got 5ft of ENE swell with a 10-second period, and the wind is glassy from the ESE. That’s a rare treat. The combined energy is moderate (599). It’s clean, small, and perfect for a longboard or a funboard. Monday the 14th morning is similar, with 4ft ENE swell, glassy wind, and calm conditions. The water temperature is about 81°F, which is just normal for the time of year – no surprises there.
That Sunday and Monday window is your best bet. After that, we’re back into a long stretch of small, fading SSW swells under 3ft, with light to moderate cross-shore winds. Nothing to write home about.
So, the pick of the bunch is Sunday the 13th morning. It’s clean, small, and glassy. The big swell on the 8th is a spectacle, but only for the experienced.
Rusty
Short Range ForecastLight rain (total 8mm), mostly falling on Wed morning. Warm (max 26°C on Wed afternoon, min 24°C on Thu night). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 22mm), heaviest during Mon night. Warm (max 26°C on Sat morning, min 23°C on Mon morning). Winds increasing (light winds from the E on Mon morning, near gales from the E by Mon night). | ||||||||||||||||||||
Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | |||||||||||||||
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 8 | ENE 8 | ENE 8 | SE 13 | SE 12 | SSE 12 | SSE 12 | SSE 12 | S 12 | S 12 | ENE 14 | ENE 13 | ENE 13 | ENE 12 | ENE 12 | E 14 | SSW 14 | SSW 15 | S 16 | S 13 | S 10 |
Wave Graph | |||||||||||||||||||||
547 | 468 | 441 | 552 | 667 | 554 | 589 | 718 | 683 | 734 | 1705 | 1725 | 1423 | 1127 | 1121 | 1014 | 2259 | 4723 | 21316 | 19412 | 2314 | |
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 | cross | cross-on | cross-on | cross-on | on | cross-on | cross-on |
High Tide | 8:09AM0.55m | 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 | — | — | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — | |
— | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | |
mm | 3 | 2 | 1 | — | — | 1 | 1 | — | — | — | 1 | 2 | — | — | 1 | 3 | 6 | 9 | 14 | 6 | 5 |
Temp °C | 25 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 24 | 26 | 27 | 26 | 27 |
Feels °C | 26 | 26 | 25 | 24 | 24 | 24 | 24 | 23 | 23 | 24 | 25 | 24 | 25 | 25 | 25 | 26 | 23 | 22 | 20 | 22 | 27 |
Swell 1 Height (m) Direction Period (s) | S 16 | S 16 | S 15 | SE 13 | SE 12 | SSE 12 | SSE 12 | SSE 12 | S 12 | S 12 | S 12 | S 12 | S 12 | SSW 12 | SSW 12 | SSW 12 | SSW 14 | SSW 15 | S 16 | ENE 10 | WSW 9 |
427 | 406 | 352 | 552 | 667 | 554 | 589 | 718 | 683 | 734 | 933 | 1048 | 1098 | 1051 | 1033 | 811 | 2259 | 4723 | 21316 | 820 | 521 | |
Swell 2 Height (m) Direction Period (s) | S 10 | SSE 10 | SE 13 | S 14 | S 14 | S 13 | E 14 | E 14 | E 14 | E 14 | SSW 18 | N 11 | SSW 16 | SSE 10 | SSW 18 | E 14 | SSE 9 | ENE 13 | NW 11 | E 14 | ENE 10 |
53 | 31 | 176 | 264 | 189 | 130 | 196 | 289 | 379 | 458 | 121 | 9 | 173 | 37 | 348 | 1014 | 121 | 949 | 19 | 97 | 386 | |
Swell 3 Height (m) Direction Period (s) | SSW 13 | S 12 | S 11 | E 13 | E 13 | E 12 | S 13 | SSW 20 | SSW 20 | SSW 18 | NNE 10 | N 11 | SSW 19 | SSW 19 | NW 16 | SW 14 | NNW 13 | NNW 12 | — | — | SSW 15 |
17 | 25 | 58 | 85 | 80 | 109 | 92 | 38 | 37 | 121 | 18 | 2 | 115 | 122 | 10 | 482 | 17 | 14 | — | — | 172 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 14 | ENE 13 | ENE 13 | ENE 12 | ENE 12 | ENE 6 | ENE 13 | ENE 7 | ENE 8 | S 13 | S 10 |
547 | 468 | 441 | 507 | 358 | 487 | 482 | 387 | 431 | 344 | 1705 | 1725 | 1423 | 1127 | 1121 | 135 | 1930 | 392 | 1038 | 19412 | 2314 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 31 | 16 | 31 | 31 | 31 | 31 | 33 | 31 | 31 | 31 | 16 | 16 | 16 | 16 | 38 | 122 | 296 | 297 | 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










