Surf Forecasts:
Ammonias surf forecast from 30 Aug 2026:
- Most powerful swell: Wednesday 2 Sep, 8AM (local time) - 3.5ft (1.0m), 16s period, S swell with 548 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 1.0m 16s and forecast to arrive on Wednesday (Sep 02) at 8AM. 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 | 8AM (Wed 2nd Sep) | 3.5ft (1.0m) 16s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright, let's be straight with you. The next couple of weeks at Ammonias are looking pretty grim. We're in for a run of poor conditions before anything half-decent shows up.
Your first real shot at a wave is on August 31st, but it's a marginal one at best. The wind is cross and cross-on from the ENE, just messing up the surface. You're looking at waves around 6ft, but with that short 8-second period, it's going to be a lumpy, messy affair. The water temp is running a bit warm for the season, about 81°, nothing crazy. The overall energy is moderate, with readings in the 600-900 range. Not a good look.
This pattern of poor to marginal surf stretches all the way through September 5th. That ENE wind, holding steady around 15-16 mph, is just going to keep the cross-chop going. Swell stays in the 5ft to 7ft range with that short period. It’s not the size that's the problem, it's the quality. This stretch is a washout for a decent surf.
Now, circle September 6th on your calendar. The energy jumps up into the 1200-1400 range, and the wave height gets a push, reaching 8ft in the morning and nearly 10ft in the afternoon. The period stretches out a bit to 9 seconds, which gives it a little more push. But the wind picks up too, a fresh 19 mph cross-shore, so it's going to be lumpy. Still a marginal call.
September 7th brings the biggest swell of the window, with that combined energy hitting a strong 1791. But it comes with 22 mph cross-shore winds and rain showers. The wave height is around 8ft, which is pushing into expert-only territory, and the quality will be poor with that wind. This setup might be better for the kite surfers than anyone with a paddle.
After that, we settle back into the same pattern of ENE winds and short-period, wind-affected waves until September 10th. Then the plug gets pulled. The swell drops off dramatically to around 2ft, and the period goes long, 17-18 seconds, but it's from the SSW, which doesn't work for this break. The energy drops way down into the 200-400 range. It's flat and lifeless through the 13th.
So, there you have it. The standout, if you can call it that, is that bump on September 6th and 7th. Even then, the wind is going to be working against you. For the next few days, it's a waiting game. The long-range stuff is promising but less certain. Keep your board ready, but don't plan any dawn patrols for a classic session.
Rusty.
Short Range ForecastModerate rain (total 11mm), heaviest on Sat night. Warm (max 27°C on Sat afternoon, min 24°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 11mm), heaviest on Wed night. Warm (max 27°C on Wed afternoon, min 24°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Sat 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | ||||||||||||||
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) | S 13 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | S 16 | S 16 | S 15 | ENE 7 | ENE 8 | ENE 7 | ENE 8 | ENE 7 | ENE 7 |
Wave Graph | ||||||||||||||||||||
215 | 404 | 376 | 344 | 281 | 405 | 353 | 451 | 421 | 344 | 487 | 427 | 406 | 363 | 387 | 322 | 231 | 288 | 249 | 432 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 4:25PM0.55m | 5:07AM0.46m | 4:47PM0.49m | 5:58AM0.49m | 5:08PM0.42m | 6:57AM0.52m | 5:24PM0.35m | 8:09AM0.55m | 5:17PM0.30m | 9:35AM0.57m | 10:57AM0.61m | |||||||||
Low Tide | 10:52PM0.06m | 10:51AM0.15m | 11:17PM0.04m | 11:48AM0.20m | 11:45PM0.03m | 1:02PM0.26m | 00:18AM0.03m | 3:05PM0.29m | 1:01AM0.04m | 2:01AM0.05m | 3:24AM0.06m | |||||||||
— | — | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | |
6:55 | — | — | 6:54 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | |
mm | — | 3 | 1 | — | 3 | 2 | 1 | 1 | — | — | 2 | 2 | — | 5 | 1 | — | — | 1 | — | 2 |
Temp °C | 27 | 25 | 26 | 27 | 26 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 27 | 25 | 26 | 27 | 25 | 26 | 26 | 25 |
Feels °C | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 25 | 25 | 24 | 26 | 27 | 25 | 25 | 26 | 24 | 25 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | S 13 | S 12 | S 12 | S 12 | SSW 15 | SSW 15 | S 11 | SSW 19 | S 18 | S 18 | S 17 | S 16 | S 16 | S 15 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 |
215 | 141 | 100 | 100 | 196 | 191 | 82 | 391 | 314 | 314 | 373 | 427 | 406 | 352 | 268 | 243 | 176 | 176 | 215 | 162 | |
Swell 2 Height (m) Direction Period (s) | E 13 | SSW 17 | SSW 16 | SSW 16 | S 11 | S 11 | SSW 14 | S 10 | SSW 14 | S 12 | SSE 10 | S 10 | SSE 10 | S 11 | S 10 | S 10 | S 10 | E 14 | E 13 | E 13 |
125 | 186 | 171 | 162 | 89 | 82 | 180 | 74 | 115 | 105 | 34 | 53 | 31 | 86 | 75 | 50 | 56 | 142 | 170 | 165 | |
Swell 3 Height (m) Direction Period (s) | SSW 17 | E 12 | E 12 | ENE 11 | ENE 11 | S 21 | ENE 10 | SW 14 | S 9 | SW 14 | SW 14 | SSW 13 | S 12 | E 14 | E 13 | E 13 | E 12 | S 11 | SSW 20 | SSW 20 |
115 | 75 | 71 | 42 | 40 | 35 | 33 | 47 | 45 | 53 | 52 | 17 | 25 | 60 | 85 | 82 | 44 | 61 | 38 | 37 | |
Wind waves Height (m) Direction Period (s) | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 8 | ENE 7 | ENE 8 | ENE 7 | ENE 7 |
207 | 404 | 376 | 344 | 281 | 405 | 353 | 451 | 421 | 344 | 487 | 424 | 392 | 363 | 387 | 322 | 231 | 288 | 249 | 432 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 31 | 16 | 33 | 31 | 16 | 33 | 16 | 16 | 16 | 31 | 16 | 16 | 31 | 16 | 31 | 31 | 16 | 16 | 16 | 14 |
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











