Surf Forecasts:
Ammonias surf forecast from 7 Sep 2026:
- Best quality surf: Monday 7 Sep, 11PM (local time) - 25ft (7.5m), 15s period, S swell with onshore winds.
- Most powerful swell: Monday 7 Sep, 11PM (local time) - 25ft (7.5m), 15s period, S swell with 25,082 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 11PM (local time) - 25ft (7.5m), 15s period with S 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 11PM. The primary swell is predicted to be 7.5m and 15s period with a secondary swell of 1.8m and 8s. Another secondary swell of 1.4m and 12s is also forecast. The wind is predicted to be onshore as the swell arrives.
The most powerful waves expected at Ammonias in the next 16 days are 7.5m 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 1.1m 7s period and expected on Tuesday (Sep 08) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Mon 7th Sep) | 25ft (7.5m) 15s |
| Best Surf | 11PM (Mon 7th Sep) | 25ft (7.5m) 15s |
| Most Powerful | 11PM (Mon 7th Sep) | 25ft (7.5m) 15s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
G’day, it’s Rusty here. Let’s cut to it. Looking at the charts for this stretch, we’ve got a bit of a rough patch ahead. The first few days are going to be a write-off, with stormy winds and messy, lumpy conditions making the surf pretty average. We’re looking at a gap of about 2 days with no good surf on offer before things start to get a little more interesting.
The best bet in the short window is Wednesday, September 9th, but even that’s just a marginal call. Early morning you’ll find a clean-looking 3ft swell from the SSW with a nice long 14-second period. The light breeze will keep it tidy, and the energy reading is weak at 688. It’s not going to be big, but it’s the pick of a pretty ordinary bunch. By the afternoon, the wind swings offshore and it’ll be glassy, but the swell drops right off and it gets a bit weak.
After that, things go a bit flat and choppy for a long stretch. There’s a real run of poor conditions through the 11th to the 16th, with small, short-period ENE wind swell and onshore winds keeping it lumpy. The energy readings stay low, mostly in the hundreds, and the wave heights just aren’t there to get excited about. It’s a real dry spell.
The only other time we might see a pulse of size is around September 17th and 18th, when the swell jumps to a stormy 7ft from the ENE, but the wind stays cross and fresh, making it messy. The energy readings jump up to strong territory, like 1216 on Friday morning, but it’ll be lumpy and hard to manage. This is probably more interesting for the kite crew than for paddle surfing, to be honest.
Right, to keep it real: the water temp at Ammonias (…) is sitting at 81° and that’s about normal for this time of year. So you don’t need the thick rubber.
So, bottom line, there’s no proper standout in the next fortnight. The Wednesday morning on the 9th is your one chance for a clean, albeit small, wave. The rest is a fight against the wind. Trust me, this is a “check the cams before you drive” kind of week. Keep the hope alive – forecasts change.
Rusty.
Short Range ForecastHeavy rain (total 75mm), 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 ENE by Wed night). | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Thu morning. Warm (max 26°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 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | SSW 16 | ENE 7 | SW 15 | ENE 10 | ENE 10 | SSW 13 | ENE 9 | SSW 15 | ENE 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 929 | 4394 | 15095 | 1958 | 693 | 511 | 336 | 253 | 237 | 305 | 305 | 225 | 164 | 183 | 226 | 314 | 250 | 98 | 149 | 84 | 90 |
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-on | cross-on | cross-on | cross | cross-on | cross | cross | cross-on | cross | cross | cross | cross | 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 | 37 | 10 | 23 | 2 | 1 | — | — | — | 2 | 4 | 2 | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 25 | 26 | 27 | 26 | 26 | 26 | 27 | 28 | 27 | 26 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 24 | 24 | 21 | 24 | 25 | 28 | 30 | 30 | 31 | 27 | 27 | 26 | 25 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | SSW 12 | SSW 15 | ENE 12 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 9 | SSW 13 | SSW 13 | SSW 12 | SSW 16 | SSW 16 | ENE 11 | ENE 8 | NE 8 | NE 9 | NE 9 | NE 8 | ENE 9 | NE 8 |
| kJ | 885 | 4394 | 1302 | 814 | 693 | 511 | 258 | 194 | 178 | 173 | 172 | 175 | 164 | 128 | 215 | 57 | 83 | 81 | 74 | 46 | 69 |
Swell 2 Height (m) Direction Period (s) | SSE 8 | NNW 13 | NNW 12 | SSW 15 | SSW 14 | S 8 | SSW 14 | SSW 13 | E 13 | E 12 | E 12 | SSW 12 | E 11 | SSW 15 | SW 15 | SW 16 | SSW 16 | ENE 10 | SSW 15 | SSW 15 | SSW 14 |
| kJ | 234 | 17 | 14 | 487 | 449 | 152 | 336 | 253 | 119 | 106 | 104 | 82 | 91 | 150 | 226 | 124 | 99 | 74 | 84 | 84 | 79 |
Swell 3 Height (m) Direction Period (s) | SSW 17 | — | NNW 12 | SW 20 | SSW 20 | SSW 14 | SSW 8 | E 13 | S 7 | SW 17 | SW 18 | E 12 | SSW 12 | SSW 12 | SW 9 | SSW 13 | SSW 13 | SSW 13 | SW 12 | SE 8 | SE 9 |
| kJ | 625 | — | 14 | 15 | 37 | 431 | 94 | 125 | 25 | 137 | 154 | 99 | 78 | 45 | 19 | 70 | 69 | 98 | 37 | 9 | 21 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ESE 8 | SSW 13 | SSW 9 | SSW 8 | — | — | — | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | NE 8 | ENE 10 | ENE 10 | E 5 | ENE 9 | NE 8 | ENE 9 |
| kJ | 929 | 1886 | 15095 | 1958 | 680 | — | — | — | 237 | 305 | 305 | 225 | 151 | 183 | 128 | 314 | 250 | 55 | 149 | 138 | 90 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 421 | 296 | 297 | 34 | 11 | 11 | 23 | 16 | 10 | 33 | 31 | 16 | 31 | 31 | 16 | 31 | 15 | 16 | 31 | 16 | 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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