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.
| 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
G'day, I'm Rusty, and I've got the latest on the surf for our local patch. Let's be straight with you – the outlook for the next 16 days is a bit of a struggle. We start with a long gap of nothing but poor or marginal conditions, so don't be in a rush to paddle out.
The first real chance of a wave comes on the morning of Wednesday, 27th August, at Ammonias. This is a reef break, fairly consistent but can get crowded, so you'll be sharing the peak. The water temperature is sitting at 81°F, which is about normal for this time of year. Swell is coming from the S at 4 ft, with a period of 17 seconds – that's a long-period groundswell, which stacks up nicely at a reef. The combined energy is moderate at 949. The wind is cross from the NE at 25 km/h (or 16 mph), which isn't perfect, but it's manageable. It's a marginal set-up, and honestly, this is the best we've got to look at. The following days are all similar – cross winds and marginal surf. Not a standout.
We hit a worse patch from Saturday, 29th August, right through to Tuesday, 3rd September. The swell picks up to 6 ft, but it's short-period windswell from the ENE with only 7 to 9 seconds between waves, and the wind is mostly cross-onshore or cross. The energy is moderate, around 600-970, but the quality is poor. It's a messy, choppy mess. For a beach-and-reef set-up like this, it looks more interesting for kite surfing than paddle surfing.
Things calm down again from Thursday, 3rd September, with smaller S swell in the 3 ft to 3 ft range, but the wind remains cross or cross-onshore. The energy is moderate (around 470-940), but the conditions are still just marginal at best. The period improves to 13-17 seconds, but the wind just won't let it clean up.
There's a faint glimmer on the morning of Sunday, 6th September, with a 3 ft SSW swell and a 16-second period – proper groundswell. The energy is a solid 741 in the morning, and the wind is a lighter 15 km/h (9 mph) from the E, but it's still cross-onshore. It's a step up from the rest, but still only marginal. The last few days trickle out with tiny, weak swell and poor conditions.
So, for the dedicated few, the best window is the morning of Wednesday, 27th August, and maybe the 6th September, but keep your expectations in check. The rest of the 16 days is a write-off.
Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Fri night. Warm (max 27°C on Wed afternoon, min 25°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 11mm), heaviest on Sat morning. Warm (max 27°C on Mon afternoon, min 25°C on Sat morning). Wind will be generally light. | ||||||||||||||||||||
Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | |||||||||||||||
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 14 | S 18 | S 19 | S 17 | S 17 | S 15 | S 14 | S 14 | S 14 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 9 | ENE 9 | ENE 8 |
Wave Graph | |||||||||||||||||||||
215 | 395 | 573 | 699 | 553 | 567 | 334 | 320 | 297 | 233 | 219 | 277 | 289 | 263 | 223 | 293 | 272 | 513 | 464 | 429 | 465 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross | cross-on | cross-on | cross | cross-on | cross-on | cross | cross | cross-on | cross | cross-on |
High Tide | 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 | 6:57AM0.52m | 5:24PM0.35m | ||||||||
Low Tide | 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 | 1:02PM0.26m | 00:18AM0.03m | |||||||
6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — | |
— | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:54 | — | — | 6:53 | — | |
mm | — | — | — | — | — | — | — | — | 2 | 1 | — | 1 | — | — | 3 | 2 | 1 | 3 | 2 | 1 | 4 |
Temp °C | 26 | 27 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 25 | 26 | 27 | 25 | 27 | 27 | 26 |
Feels °C | 26 | 27 | 25 | 24 | 24 | 24 | 25 | 25 | 24 | 24 | 24 | 25 | 25 | 25 | 25 | 26 | 27 | 25 | 28 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | 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 | S 10 | SSW 18 | S 18 | S 17 |
215 | 395 | 573 | 699 | 553 | 567 | 334 | 320 | 297 | 215 | 215 | 141 | 100 | 100 | 196 | 191 | 82 | 75 | 333 | 311 | 364 | |
Swell 2 Height (m) Direction Period (s) | S 18 | SSW 13 | SSW 13 | SSW 12 | S 12 | SE 8 | SSW 11 | E 15 | E 14 | E 13 | E 13 | SSW 17 | SSW 16 | SSW 16 | S 11 | S 11 | SSW 14 | S 19 | S 10 | SSE 10 | S 10 |
167 | 133 | 135 | 79 | 73 | 10 | 39 | 72 | 107 | 89 | 125 | 186 | 171 | 162 | 91 | 85 | 180 | 273 | 65 | 71 | 52 | |
Swell 3 Height (m) Direction Period (s) | SE 8 | SE 8 | W 10 | NNE 8 | NNE 8 | W 10 | NNE 6 | SSW 19 | SW 19 | SW 18 | SSW 17 | E 12 | E 12 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | SW 14 | SSW 14 | SSW 12 | SW 14 |
34 | 32 | 7 | 7 | 6 | 8 | 13 | 35 | 90 | 80 | 115 | 75 | 71 | 41 | 39 | 20 | 31 | 51 | 108 | 30 | 52 | |
Wind waves Height (m) Direction Period (s) | E 6 | E 6 | E 6 | E 7 | E 6 | ENE 6 | E 6 | ENE 6 | E 6 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 9 | ENE 9 | ENE 8 |
156 | 139 | 173 | 171 | 135 | 155 | 130 | 143 | 176 | 233 | 219 | 277 | 289 | 263 | 223 | 293 | 272 | 513 | 464 | 429 | 465 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 33 | 122 | 38 | 33 | 31 | 16 | 31 | 16 | 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











