
Surf Forecasts:
Ammonias surf forecast from 7 Sep 2026:
- Best quality surf: Monday 7 Sep, 8PM (local time) - 18ft (5.5m), 15s period, SSW swell with cross-onshore winds.
- Most powerful swell: Monday 7 Sep, 11PM (local time) - 28ft (8.5m), 15s period, S swell with 29,978 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 8PM (local time) - 18ft (5.5m), 15s period with SSW swell.
Best Forecast Surf Conditions for Ammonias this week:
The surf forecast for Ammonias over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Sep 07) at 8PM. The primary swell is predicted to be 5.5m and 15s period with a secondary swell of 4.5m and 9s. The wind is predicted to be cross-onshore as the swell arrives.
The most powerful waves expected at Ammonias in the next 16 days are 8.5m 15s and forecast to arrive on Monday (Sep 07) at 11PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 9s period and expected on Tuesday (Sep 08) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Mon 7th Sep) | 18ft (5.5m) 15s |
| Best Surf | 8PM (Mon 7th Sep) | 18ft (5.5m) 15s |
| Most Powerful | 11PM (Mon 7th Sep) | 28ft (8.5m) 15s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s be straight with you – this 16-day window is a bit of a write-off for Ammonias. The whole stretch is looking poor, with no real windows to get excited about. We’re kicking off with a rough start: Monday morning sees a 10ft swell from the ENE, but with a 22 mph cross-on wind and a risk of thunderstorms, it’s a proper mess. The combined energy is strong at 2899, but that’s wasted on blown-out, lumpy conditions. By Monday afternoon, it gets worse – an 12ft SSW swell with a 15-second period, but a near gale 31 mph cross-on wind makes it unrideable. Tuesday morning is still a no-go with a 10ft SSW swell and fresh cross-shore wind. Tuesday afternoon drops to 6ft, but the wind is still cross-shore, and the whole thing is marginal at best. The water temperature is 81°, which is about average for the time of year, so no surprises there.
Wednesday morning has a 3ft SSW swell with a 14-second period, but the light cross-on wind and small wind ripples keep it poor. The energy is weak (690). Wednesday afternoon sees a 3ft SSW swell with a 13-second period and a light onshore wind, but it’s still a no-go.
Thursday has a 5ft to 6ft ENE swell, but the cross-on wind and rain showers keep it marginal to poor. The energy is moderate (753 to 744). By Friday, the swell drops to 2ft to 2ft with a long 16-second period from the SW, but the cross-on wind and gentle breeze make it small and choppy. The energy is weak (500 to 451). Saturday and Sunday are similar – small 2ft to 3ft ENE swells, cross-on wind, and weak energy (293 down to 172). The water temp stays steady, but there’s nothing to ride.
The second week doesn’t get any better. Monday, 14 September, has a tiny 1ft to 2ft SW swell with a very long period of 22 to 23 seconds, but the energy is weak (328 to 293) and the wind is cross-shore. Tuesday and Wednesday have 2ft to 3ft SW swells, but the wind stays cross-on or cross-shore, and the energy is still weak (440 to 574). Thursday, 17 September, sees a 3ft SSW swell with a moderate 16 mph cross-on wind – still poor. The energy picks up slightly to 802 on Thursday afternoon, but it’s marginal. Friday, 18 September, has a 3ft to 4ft SSW swell with moderate cross-shore wind, and the energy hits 1045, but it’s still marginal at best. The rest of the period from 19 September to 22 September is a slow fade – small 2ft to 3ft SSW swells, cross-shore or cross-on wind, and weak to moderate energy, all poor or marginal.
Honestly, there’s not a single standout session here. The wind is always in the wrong direction, the swell is either too small, too blown out, or the period is too long for the beach break. With consistent onshore or cross-shore winds and mostly poor surf quality, this setup looks more interesting for kite surfing than paddle surfing. The only glimmer is Friday afternoon, 18 September, with a 4ft SSW swell and a 17-second period, but the cross-shore wind and moderate breeze keep it marginal. No crowds to worry about – no one’s paddling out in this.
Stay patient, mate. It tends not to stay poor for long, but this run is a blank one. Forecasts can change. I’ll be watching.
Rusty
Short Range ForecastHeavy rain (total 61mm), heaviest during Mon morning. Warm (max 28°C on Wed afternoon, min 24°C on Mon morning). Winds decreasing (gales from the SE on Mon night, light winds from the SSW by Wed morning). | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Thu afternoon. Warm (max 27°C on Thu morning, min 24°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | |||||||||||||||
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) | ENE 8 | SSW 15 | SSW 13 | SSW 9 | SSW 8 | ENE 11 | SSW 14 | SSW 13 | SSW 13 | ENE 8 | ENE 7 | ENE 7 | SW 16 | SW 15 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | SSW 14 |
Wave Graph | |||||||||||||||||||||
1144 | 4517 | 20142 | 1302 | 693 | 521 | 336 | 253 | 178 | 288 | 314 | 225 | 198 | 229 | 436 | 169 | 140 | 128 | 88 | 86 | 79 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross | cross | cross | cross-on | on | cross | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross |
High Tide | 1:42PM0.69m | 1:36AM0.30m | 2:20PM0.68m | 2:21AM0.36m | 2:54PM0.66m | 3:04AM0.41m | 3:24PM0.61m | 3:47AM0.47m | 3:51PM0.55m | 4:29AM0.51m | 4:16PM0.48m | 5:11AM0.54m | 4:38PM0.41m | ||||||||
Low Tide | 8:46PM0.13m | 7:02AM0.02m | 9:05PM0.11m | 7:55AM0.03m | 9:25PM0.09m | 8:43AM0.05m | 9:45PM0.07m | 9:31AM0.09m | 10:06PM0.05m | 10:19AM0.13m | 10:28PM0.04m | 11:10AM0.18m | 10:50PM0.04m | ||||||||
6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | |
— | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — | |
mm | 20 | 12 | 24 | 2 | 2 | — | — | — | 1 | 2 | 5 | 1 | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 26 | 27 | 26 | 27 | 26 | 27 | 28 | 27 | 27 | 26 | 25 | 26 | 26 | 25 | 25 | 25 | 25 | 26 | 26 | 25 |
Feels °C | 24 | 24 | 20 | 24 | 27 | 28 | 30 | 31 | 31 | 29 | 28 | 27 | 27 | 27 | 26 | 26 | 26 | 26 | 27 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | SSW 12 | SSW 15 | ENE 10 | ENE 11 | ENE 11 | ENE 11 | ENE 10 | ENE 9 | ENE 8 | SSW 13 | SSW 12 | SW 16 | SW 16 | ENE 11 | SW 15 | ENE 10 | ENE 10 | NE 9 | NE 8 | NE 8 | NE 8 |
885 | 4517 | 1004 | 917 | 693 | 521 | 258 | 165 | 133 | 173 | 172 | 211 | 198 | 128 | 226 | 169 | 140 | 79 | 74 | 72 | 71 | |
Swell 2 Height (m) Direction Period (s) | SSE 9 | NNW 13 | NNW 12 | W 9 | SSW 14 | S 8 | SSW 14 | SSW 13 | SSW 13 | E 12 | E 12 | E 12 | E 11 | SW 15 | SSW 11 | NNE 8 | NE 9 | SSW 13 | ENE 9 | SSW 15 | SSW 14 |
245 | 17 | 14 | 538 | 449 | 182 | 336 | 253 | 178 | 106 | 104 | 99 | 91 | 229 | 23 | 61 | 83 | 98 | 88 | 84 | 79 | |
Swell 3 Height (m) Direction Period (s) | SSW 17 | — | — | SE 8 | NW 9 | SSW 14 | SSW 8 | S 7 | E 13 | SSW 17 | SW 18 | SSW 12 | S 12 | NNE 8 | SE 8 | SW 16 | SSW 16 | SW 16 | SSW 15 | SE 8 | ENE 9 |
625 | — | — | 260 | 64 | 356 | 96 | 40 | 119 | 186 | 154 | 82 | 71 | 42 | 18 | 124 | 99 | 64 | 84 | 15 | 26 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | ESE 8 | SSW 13 | SSW 9 | SSW 8 | W 6 | — | — | — | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 11 | — | — | ENE 10 | — | ENE 9 | E 5 |
1144 | 1841 | 20142 | 1302 | 657 | 32 | — | — | — | 288 | 314 | 225 | 140 | 94 | 436 | — | — | 128 | — | 86 | 21 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 46 | 296 | 297 | 32 | 23 | 11 | 11 | 38 | 10 | 16 | 31 | 16 | 31 | 15 | 15 | 14 | 12 | 16 | 31 | 15 | 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










