Surf Forecasts:
Ammonias surf forecast from 25 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, Rusty here again, switching it up for the imperial fellas. Let's break down what's going on at Ammonias for the next couple of weeks. I've gotta be honest, it's a rough patch ahead.
We start off on Monday the 24th of August with a 6ft swell coming from the ENE, but the wind is a cross-shore 25 km/h, leaving things a bit choppy. The water is a warm 81°, which is average for this time of year. The combined wave energy is sitting at 592, which is moderate, but the forecast is calling it marginal. Not a great start.
The forecast just kind of repeats itself for the next ten days. It's a whole lot of 5ft to 7ft ENE windswell, with short periods of 6 to 8 seconds. Those short periods mean the waves will be weak and disorganised. The wind stays on our case, blowing 20 to 25 km/h, mostly cross or cross-onshore. It's gonna be choppy and messy out there. There's a little bit of longer period S swell mixing in around Thursday the 27th and Friday the 28th, pushing the wave energy up into the 900s (strong), but the wind just ruins it. Every session is getting a "poor" or "marginal" rating, and I can't see a decent wave in the bunch.
Even when the swell gets a bit bigger, like that 8ft ENE pulse on Monday the 31st of August (energy up to 1020, which is strong), that 25 km/h cross-breeze is still there to chop it all up. It's frustrating because there's plenty of water moving, but the surface will be junk.
The only hint of something better comes at the very end, on Tuesday the 8th of September. We've got a 5ft ENE swell with a slightly better period of 9 seconds, but the big change is the wind. It's a light 10 km/h cross-onshore breeze. This session gets the highest score of the whole forecast. It's not perfect, but that light wind will make for the cleanest conditions we've seen in weeks. If you're desperate for a paddle, that's your best shot.
So, the only real standout—and I use the term loosely—is that Tuesday the 8th of September afternoon. It's the least bad option. For everything else? This whole stretch looks like it was made for kite surfing, not a proper surf. My advice is to keep the board in the van and wait for the forecast to change.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Mon afternoon. Warm (max 27°C on Mon afternoon, min 24°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 8mm), mostly falling on Thu night. Warm (max 26°C on Thu afternoon, min 24°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | ||||||||||||||
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 7 | ENE 7 | ENE 6 | E 7 | ENE 7 | E 7 | S 18 | S 19 | S 17 | S 17 | S 15 | S 14 | S 14 | S 14 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 307 | 239 | 212 | 270 | 191 | 255 | 395 | 573 | 699 | 547 | 567 | 334 | 394 | 294 | 252 | 255 | 220 | 210 | 248 | 285 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross | cross-on |
High Tide | 2:19PM0.63m | 1:51AM0.28m | 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 | |||||||
Low Tide | 9:23PM0.17m | 7:21AM0.04m | 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 | |||||||
 |  |  | | | | |  |  | |  |  | | | | | | | | | |
 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — |
mm | 2 | — | — | — | — | — | — | — | — | — | 1 | 1 | — | 1 | — | 1 | 2 | 2 | — | 2 |
Temp °C | 27 | 26 | 26 | 27 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 |
Feels °C | 28 | 27 | 26 | 27 | 25 | 25 | 25 | 24 | 25 | 25 | 25 | 26 | 25 | 24 | 25 | 25 | 24 | 24 | 26 | 24 |
Swell 1 Height (m) Direction Period (s) | SE 9 | SE 8 | SE 8 | SSE 7 | SSW 15 | 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 |
| kJ | 68 | 65 | 57 | 32 | 167 | 215 | 395 | 573 | 699 | 547 | 567 | 334 | 394 | 294 | 215 | 215 | 141 | 136 | 136 | 196 |
Swell 2 Height (m) Direction Period (s) | SSW 13 | SSW 12 | SSW 16 | SSW 16 | SSE 8 | S 18 | SSW 13 | SSW 13 | SSW 12 | S 12 | NNE 7 | SSW 11 | E 15 | E 16 | E 14 | E 13 | E 13 | SSW 16 | SSW 16 | S 11 |
| kJ | 156 | 121 | 201 | 193 | 48 | 167 | 133 | 135 | 79 | 73 | 10 | 40 | 68 | 122 | 150 | 126 | 119 | 171 | 162 | 88 |
Swell 3 Height (m) Direction Period (s) | SSW 18 | SSW 16 | SSW 12 | SSW 12 | SSW 12 | SSE 12 | W 10 | SE 6 | N 8 | NNE 8 | W 10 | E 16 | SSW 19 | SW 19 | SW 18 | SSW 17 | SSW 17 | E 12 | E 12 | E 11 |
| kJ | 61 | 153 | 83 | 85 | 79 | 14 | 8 | 19 | 5 | 13 | 8 | 45 | 35 | 90 | 80 | 115 | 188 | 106 | 71 | 62 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 6 | E 7 | ENE 7 | E 7 | E 6 | ENE 6 | E 6 | E 6 | E 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
| kJ | 307 | 239 | 212 | 270 | 191 | 255 | 187 | 139 | 139 | 115 | 106 | 134 | 161 | 188 | 252 | 255 | 220 | 210 | 248 | 285 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 118 | 38 | 46 | 31 | 16 | 31 | 16 | 16 | 16 | 31 | 16 | 31 | 31 | 16 | 31 | 31 | 16 | 31 | 31 | 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
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