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 0.4m 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 have a look at what’s on the cards for Ammonias.
Right off the bat, we’re looking at a pretty grim run of surf. The first few days are almost a write-off, and the forecast is full of poor conditions and moderate cross-onshore winds. The water temperature is sitting at 81°, which is bang on average for this time of year.
The first real chance of anything half-decent pops up on Thursday, 3rd September. We’ve got a small 3ft swell from the S, with a period of 14 seconds. It’s a long period groundswell, so there’s good energy in the water, but the real kicker here is the wind. It’s a light breeze from the SE, turning to light onshore from the E in the afternoon. This is about as clean as it’s going to get in the whole window. The combined swell energy is moderate (664). It’s a marginal call, but for a morning session, it might just be worth a paddle if you’re desperate.
The next date to circle is Sunday, 6th September. We’ve got a bigger 3ft swell from the SSW with a very long period of 17 seconds, and the combined energy is strong (1334). That’s a proper groundswell. The issue is the wind is a moderate cross-onshore, making it choppy. Still, as a point break, Ammonias should handle this long period swell better than a beachie would. It’s a marginal one, but it’s the best of a bad bunch.
The only other half-interesting day is Tuesday, 8th September. The afternoon sees a 4ft SSW swell with a 15-second period, and the combined energy is strong (1139). The wind is a gentle cross-shore, which will keep the surface pretty clean. It’s a marginal call, but it’s the cleanest we’ll see for a while.
Honestly, there’s no standout day in this whole 16-day window. The best sessions are those marginal Thursday 3rd September and Tuesday 8th September afternoons, but even then, it’s a gamble. For a reef break that’s fairly consistent, it’s a frustrating run. It’s a rare spot, and when it’s on, it’s magic, but this forecast is a real test of patience.
Rusty.
Short Range ForecastSome drizzle, heaviest during Thu night. Warm (max 27°C on Tue morning, min 25°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Fri afternoon. Warm (max 26°C on Fri morning, min 25°C on Fri morning). Wind will be generally light. | ||||||||||||||||||||
Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | |||||||||||||||
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) | SSW 16 | E 7 | ENE 7 | E 6 | S 18 | S 19 | S 17 | S 17 | S 15 | S 14 | S 14 | S 14 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 201 | 263 | 186 | 233 | 395 | 573 | 699 | 553 | 567 | 334 | 320 | 294 | 239 | 219 | 276 | 321 | 263 | 348 | 223 | 250 | 359 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross-on | cross | cross | cross-on | cross | cross-on | 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 | — | — | 6:18 | — | — | 6:20 | — | — |
 | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:54 | — |
mm | — | — | — | — | — | — | — | — | 1 | — | 1 | 2 | 2 | — | — | 1 | — | — | 1 | 1 | 2 |
Temp °C | 27 | 27 | 25 | 26 | 27 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 27 | 27 | 25 | 25 | 26 | 24 | 25 | 25 | 25 | 26 | 25 | 24 | 25 | 24 | 24 | 25 | 25 | 25 | 25 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | SE 7 | SSW 16 | SSE 9 | 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 | S 11 | S 11 | S 19 |
| kJ | 56 | 193 | 52 | 215 | 395 | 573 | 699 | 553 | 567 | 334 | 320 | 294 | 219 | 215 | 141 | 136 | 136 | 196 | 114 | 82 | 273 |
Swell 2 Height (m) Direction Period (s) | SSW 16 | SSW 12 | SSW 15 | 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 | SSW 15 | SSW 14 | S 10 |
| kJ | 201 | 85 | 167 | 167 | 133 | 135 | 79 | 73 | 17 | 39 | 72 | 107 | 89 | 125 | 186 | 171 | 162 | 87 | 191 | 180 | 74 |
Swell 3 Height (m) Direction Period (s) | SSW 12 | SSE 13 | SSW 12 | W 10 | W 10 | W 10 | NNE 8 | NNE 8 | W 10 | E 16 | SSW 19 | SW 19 | SW 18 | SSW 17 | E 12 | E 12 | E 11 | ENE 11 | ENE 10 | SSW 19 | SSW 14 |
| kJ | 83 | 33 | 79 | 8 | 8 | 8 | 7 | 12 | 8 | 45 | 35 | 90 | 80 | 115 | 73 | 67 | 63 | 40 | 36 | 123 | 79 |
Wind waves Height (m) Direction Period (s) | E 6 | E 7 | ENE 7 | E 6 | E 6 | E 6 | E 6 | ENE 6 | E 6 | ENE 6 | ENE 7 | E 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
| kJ | 176 | 263 | 186 | 233 | 187 | 178 | 161 | 115 | 144 | 170 | 158 | 206 | 239 | 219 | 276 | 321 | 263 | 348 | 223 | 250 | 359 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 46 | 33 | 16 | 31 | 46 | 16 | 16 | 16 | 16 | 16 | 31 | 31 | 33 | 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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