Surf Forecasts:
Ammonias surf forecast from 26 Aug 2026:
- Most powerful swell: Thursday 27 Aug, 2PM (local time) - 3.5ft (1.1m), 17s period, S swell with 702 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 1.1m 17s and forecast to arrive on Thursday (Aug 27) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 7s period and expected on Friday (Aug 28) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Thu 27th Aug) | 3.5ft (1.1m) 17s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s take a look at what’s happening at Ammonias.
Honestly, it’s a tough stretch ahead. The entire sixteen-day window is looking like a write-off for any quality paddle surfing. The problem is persistent cross-shore and cross-onshore winds out of the east-northeast, never letting the surf clean up. The swell is either too small with poor direction, or when it does pick up size, it’s a short-period, wind-affected mess.
We start on Tuesday the 25th of August. There's a tiny 2ft SSW groundswell rolling in with a long 16-second period, carrying moderate wave energy (497). But with a 12 mph cross-shore wind, the comments say it all: “poor surf conditions.” Not worth a paddle. The water temp is 81°, which is about average for this time of year.
Wednesday the 26th sees a slight bump to 2ft, but that cross-onshore wind picks up to 16 mph, making things choppy. The wave energy climbs (605), but the quality isn’t there. Thursday the 27th offers the best-looking swell of the first week: 4ft from the south with a 17-second period, showing moderate energy (938). But those cross-shore winds just chop it up. It’s only “marginal” at best.
From Friday the 28th right through to the end of the first week, it’s a grind. Wave heights bounce around 3ft to 4ft, period drops, and the wind stays stubbornly bad. Rain showers on the weekend too. Not fun.
Then things get weird from Sunday the 30th through to the start of September. We see a pulse of short-period, 7-second wind swell out of the east-northeast, pushing 6ft to 6ft. This is a lot of energy for the conditions (up to 888), but with a period that short and wind on it, these are just lumpy, bumpy, crumbly waves. Not surfable in any meaningful way.
The first part of September is more of the same: 6ft to 7ft of short-period wind swell with cross-shore winds. By the 3rd and 4th of September, we’re looking at 7ft to 7ft from the east-northeast with a 8-second period. That’s a lot of water moving, but it’s all chop and no shape. The energy readings are strong (up to 936), but with the wind and period, this is only going to be for the hardcore, and honestly, it looks more interesting for kite surfing than paddle surfing.
The only faint glimmer comes in the second week, starting Sunday the 6th of September. The swell period finally stretches out to 12 seconds from the east-northeast, with wave heights around 6ft to 6ft. The energy jumps drastically (1859), indicating a strong groundswell. But the wind is still cross-onshore at 16 mph with risk of thunderstorms. Then on Monday the 7th, a long-period 4ft from the south with an 18-second period shows up, carrying huge energy (1477). But once again, that east-northeast cross wind ruins the party. By Tuesday the 8th, the wind even freshens to 19 mph, making it lumpy.
So, there’s no standout here. No day to get excited about. The wind never cooperates long enough to let any of the building swell present itself cleanly. If you’re desperate, the most promising window is the 6th and 7th of September, but you’d be gambling on a thunderstorm and an onshore wind. I’d wait for the next forecast.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Thu night. Warm (max 28°C on Tue afternoon, min 25°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Mon morning. Warm (max 26°C on Fri afternoon, min 24°C on Fri night). Wind will be generally light. | |||||||||||||||||||
Tue 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | ||||||||||||||
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 6 | E 7 | SSW 14 | S 18 | S 19 | S 17 | S 17 | S 15 | S 14 | S 14 | S 14 | S 13 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph | ||||||||||||||||||||
193 | 215 | 215 | 395 | 573 | 699 | 553 | 567 | 334 | 320 | 294 | 219 | 215 | 307 | 321 | 271 | 285 | 256 | 263 | 462 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross | cross | cross | cross | cross | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross | cross |
High Tide | 2:48PM0.64m | 2:25AM0.31m | 3:14PM0.64m | 3:02AM0.35m | 3:38PM0.62m | 3:40AM0.38m | 4:02PM0.59m | 4:22AM0.42m | 4:25PM0.55m | 5:07AM0.46m | 4:47PM0.49m | 5:58AM0.49m | 5:08PM0.42m | |||||||
Low Tide | 9:34PM0.16m | 8:01AM0.03m | 9:50PM0.13m | 8:40AM0.04m | 10:08PM0.11m | 9:19AM0.06m | 10:29PM0.08m | 10:02AM0.10m | 10:52PM0.06m | 10:51AM0.15m | 11:17PM0.04m | 11:48AM0.20m | 11:45PM0.03m | |||||||
— | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:20 | — | — | |
7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:54 | — | |
mm | — | — | — | — | — | — | — | 1 | 1 | — | 1 | 2 | — | — | — | — | 1 | 3 | 1 | — |
Temp °C | 28 | 26 | 26 | 27 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 26 |
Feels °C | 28 | 27 | 25 | 26 | 25 | 25 | 25 | 25 | 26 | 25 | 24 | 25 | 24 | 24 | 25 | 25 | 24 | 25 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSE 8 | SSW 14 | S 18 | S 19 | S 17 | S 17 | S 15 | S 14 | S 14 | S 14 | S 13 | S 13 | S 12 | S 12 | S 12 | SSW 15 | SSW 15 | S 11 | SSW 19 |
193 | 46 | 215 | 395 | 573 | 699 | 553 | 567 | 334 | 320 | 294 | 219 | 215 | 141 | 136 | 136 | 196 | 191 | 82 | 391 | |
Swell 2 Height (m) Direction Period (s) | SSW 12 | SSW 12 | S 18 | SSW 13 | SSW 13 | SSW 12 | S 12 | NNE 7 | SSW 11 | E 15 | E 14 | E 13 | E 13 | SSW 17 | SSW 16 | SSW 16 | S 11 | S 11 | SSW 14 | SSE 10 |
85 | 86 | 167 | 133 | 135 | 79 | 73 | 10 | 40 | 72 | 107 | 89 | 125 | 186 | 171 | 162 | 87 | 82 | 180 | 77 | |
Swell 3 Height (m) Direction Period (s) | SSE 7 | SSW 15 | SE 8 | W 10 | W 10 | NNE 8 | NNE 8 | W 10 | E 16 | SSW 19 | SE 7 | SW 18 | SSW 17 | E 12 | E 12 | E 11 | ENE 11 | ENE 10 | SSW 19 | SSW 15 |
31 | 121 | 33 | 8 | 8 | 7 | 12 | 8 | 45 | 35 | 14 | 80 | 115 | 73 | 70 | 64 | 40 | 35 | 124 | 21 | |
Wind waves Height (m) Direction Period (s) | ENE 6 | E 7 | E 6 | E 6 | E 6 | ENE 6 | ENE 6 | E 6 | ENE 6 | ENE 6 | ENE 6 | E 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
188 | 215 | 190 | 182 | 178 | 160 | 130 | 128 | 139 | 149 | 182 | 213 | 214 | 307 | 321 | 271 | 285 | 256 | 263 | 462 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 31 | 16 | 31 | 31 | 16 | 16 | 16 | 16 | 31 | 16 | 16 | 31 | 33 | 16 | 31 | 16 | 16 | 31 | 33 | 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











