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.
| 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. Let’s have a look at what we’ve got on offer for Ammonias over the next couple of weeks.
Right from the get-go, it’s a tough start. The first solid recommendation doesn’t show up until Tuesday the 1st of September. Before that, we’re looking at a long stretch of poor to marginal conditions. The wind is mostly cross or cross-on from the ENE or NE, chopping up the surface, and the swell is short-period windswell in the 5 ft to 6 ft range with a period of just 6 to 7 seconds – that’s weak, lumpy stuff with no push. The combined wave energy is stuck between 542 and 674, which is weak. Honestly, there’s nothing worth paddling out for from Tuesday the 25th of August right through to Monday the 1st of September. That’s a solid week of nothing.
Now, on Tuesday the 1st of September morning, things finally start to shift. The swell picks up to 7 ft from the ENE with an 8-second period, and the energy jumps to 1031 – that’s moderate energy. The wind is still cross-shore from the ENE at 16 mph, so it’s not glassy, but the wave state is listed as “moderate cross-shore with a cross-chop,” which is a step up from the choppy rubbish we’ve been seeing. This is the standout window in the whole forecast. The swell is over 8 ft a bit later on, so this is really for experienced surfers only – beginners should sit this one out. The break itself is a reef, fairly consistent, and it's exposed. The crowds here are listed as “often,” so expect plenty of company if you paddle out.
The rest of the period after that is a bit of a mixed bag, but honestly, nothing else comes close to that Tuesday morning. The wind stays messy, the swell drops back, and we get more marginal or poor calls. By the 6th of September, there’s a brief pulse of long-period S swell at 3 ft and 16 seconds – that’s a groundswell with decent period, but at that size it’s barely breaking. Energy is moderate (675), but the wind is cross-onshore, so it’ll be choppy. A long-period south swell on a reef can be fun if it lines up, but the conditions aren’t doing it any favours.
Bottom line: if you’re keen, mark your calendar for Tuesday the 1st of September morning. That’s the only window where the stars sort of align. The rest of the outlook is a waiting game.
Stay salty,
Rusty
Short Range ForecastMostly dry. Warm (max 27°C on Tue morning, min 24°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 8mm), mostly falling on Thu night. Warm (max 27°C on Fri afternoon, min 24°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | ||||||||||||||
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) | E 7 | ENE 6 | E 7 | E 7 | E 7 | 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 |
Wave Graph | |||||||||||||||||||
255 | 205 | 233 | 212 | 255 | 395 | 573 | 699 | 553 | 567 | 334 | 394 | 294 | 239 | 219 | 298 | 251 | 270 | 316 | |
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 | cross | cross | cross | cross | cross-on | cross | cross |
High Tide | 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 | — | — | — | — | — | — | — | — | — | 1 | — | — | 3 | — | 1 | 1 | 1 | 1 | — |
Temp °C | 26 | 27 | 27 | 25 | 26 | 27 | 25 | 26 | 26 | 25 | 26 | 27 | 25 | 26 | 26 | 25 | 25 | 26 | 25 |
Feels °C | 28 | 27 | 27 | 25 | 25 | 26 | 24 | 25 | 25 | 24 | 25 | 26 | 24 | 25 | 25 | 25 | 25 | 24 | 24 |
Swell 1 Height (m) Direction Period (s) | SE 8 | SE 7 | SSE 7 | 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 |
54 | 56 | 31 | 48 | 215 | 395 | 573 | 699 | 553 | 567 | 334 | 394 | 294 | 219 | 215 | 141 | 136 | 136 | 196 | |
Swell 2 Height (m) Direction Period (s) | SSW 12 | SSW 16 | SSW 16 | SSW 12 | S 18 | SSW 13 | SSW 13 | SSW 12 | S 12 | SSE 8 | SSW 11 | E 15 | E 14 | E 14 | E 13 | E 12 | SSW 16 | SSW 16 | S 11 |
121 | 201 | 193 | 86 | 167 | 133 | 135 | 79 | 73 | 6 | 40 | 68 | 65 | 94 | 125 | 110 | 171 | 162 | 87 | |
Swell 3 Height (m) Direction Period (s) | SSW 16 | SSW 12 | SSW 12 | SSW 15 | W 10 | SE 8 | W 10 | NNE 8 | NNE 8 | W 10 | E 16 | SSW 19 | SW 19 | SW 18 | SSW 17 | SSW 17 | E 12 | E 12 | E 11 |
153 | 83 | 85 | 121 | 8 | 18 | 8 | 7 | 13 | 8 | 45 | 35 | 90 | 80 | 115 | 188 | 73 | 71 | 61 | |
Wind waves Height (m) Direction Period (s) | E 7 | ENE 6 | E 7 | E 7 | E 7 | E 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 | ENE 7 |
255 | 205 | 233 | 212 | 255 | 190 | 156 | 135 | 130 | 159 | 165 | 176 | 245 | 239 | 219 | 298 | 251 | 270 | 316 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 16 | 33 | 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 | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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











