
Surf Forecasts:
Ammonias surf forecast from 9 Aug 2026:
- Most powerful swell: Saturday 15 Aug, 8PM (local time) - 10ft (3.0m), 9s period, ENE swell with 1,582 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 3.0m 9s and forecast to arrive on Saturday (Aug 15) at 8PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 12s period and expected on Thursday (Aug 13) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Sat 15th Aug) | 10ft (3.0m) 9s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's on the menu for Ammonias over the next couple of weeks.
Right off the bat, I gotta be honest with you – this stretch is lookin' tough. We're starting with a bit of a flat spell. The first surfable recommendation doesn't come until Sunday the 9th of August, and even then it's a marginal call. We're talking a 5ft swell from the ENE with a short, weak 7-second period. The wind is cross-shore, and the energy is moderate, sittin' around (537). It's really just a 'maybe' session for the die-hards. Before that, Saturday the 8th is a complete write-off with poor, choppy conditions.
Things stay on the fence for a few days. Monday the 10th sees the swell drop back to 2ft, but the period stretches right out to a very long 16 seconds from the SSW, with a moderate energy (611). That long period from the south is a bit tricky at a reef break, but it could offer a clean little wave if the tide lines up. The water temp is a balmy 80°, which is spot on average for this time of year, so no wetsuit worries.
The real standout in this whole outlook – and I use that term loosely – is shaping up to be Wednesday the 12th through Thursday the 13th. On Wednesday afternoon, we get a solid 4ft groundswell from the S with a very long 18-second period. The energy jumps right up to strong (1204). Thursday morning pushes that swell to 5ft with a 16-second period and energy at (1258). It's still cross-shore wind, which is a shame, but the quality of that swell is pure. This is the best window for Ammonias, but keep your expectations tempered; it's still only a marginal forecast.
After that, things get messy and big. By Friday the 14th and into the weekend, we see the swell really start to pump, but it's all short-period, wind-affected junk from the ENE. By Saturday the 15th of August, we're lookin' at 13ft to 18ft of lumpy, cross-shore mess. The energy is enormous (over 7000), but it's gonna be a washing machine. By Sunday the 16th, we've got gale-force cross-onshore winds up to 40 mph from the East, making it completely blown out. This is kite-surfing territory, not paddle sur fing.
The second week from the 17th onwards is a similar story. We've got a persistent 5ft to 7ft ENE swell, but it's short period (7-8 seconds) and nearly always accompanied by a moderate cross or cross-onshore breeze. The forecast confidence for this far out is low, and honestly, it looks like a long run of choppy, uninspiring surf. There's a brief glimmer on Thursday the 20th afternoon with a 6ft ENE swell, but the wind is still cross-onshore, keeping it choppy.
Bottom line: Ammonias is struggling this period. The only real window worth paddling out for is the Wednesday 12th to Thursday 13th window with the long-period south groundswell. For the rest of the time, the conditions are just too messy to get excited about. We're in for a lean run.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Mon morning. Warm (max 27°C on Sat afternoon, min 24°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Tue afternoon, min 24°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Sat 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | ||||||||||||||
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) | SW 18 | ENE 6 | ENE 7 | ENE 7 | SSW 16 | ENE 7 | ENE 7 | SSW 15 | SSW 15 | SSW 14 | S 20 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | ENE 8 | ENE 8 |
Wave Graph | ||||||||||||||||||||
161 | 165 | 233 | 193 | 263 | 259 | 234 | 231 | 222 | 210 | 373 | 515 | 741 | 1029 | 1004 | 784 | 743 | 598 | 589 | 916 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 00:17AM0.19m | 2:05PM0.73m | 1:24AM0.22m | 2:47PM0.75m | 2:17AM0.26m | 3:26PM0.74m | 3:06AM0.30m | 4:02PM0.71m | 3:54AM0.34m | 4:34PM0.66m | 4:44AM0.37m | 5:03PM0.59m | ||||||||
Low Tide | 9:20PM0.16m | 6:02AM-0.03m | 9:35PM0.15m | 7:01AM-0.05m | 9:56PM0.13m | 7:54AM-0.06m | 10:20PM0.12m | 8:43AM-0.04m | 10:44PM0.10m | 9:30AM-0.00m | 11:09PM0.08m | 10:17AM0.05m | 11:35PM0.07m | |||||||
— | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | |
7:13 | — | — | 7:12 | — | — | 7:10 | — | — | 7:10 | — | — | 7:09 | — | — | 7:08 | — | — | 7:08 | — | |
mm | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 25 | 26 | 27 | 25 | 26 | 26 | 25 | 27 | 27 | 25 | 26 | 26 | 25 | 26 | 27 | 26 | 26 | 27 | 25 |
Feels °C | 27 | 25 | 26 | 27 | 26 | 27 | 27 | 25 | 28 | 27 | 25 | 25 | 25 | 24 | 25 | 26 | 25 | 25 | 26 | 24 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | SSW 13 | SSW 13 | S 18 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 13 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | S 14 | S 14 |
102 | 137 | 98 | 156 | 263 | 259 | 234 | 231 | 222 | 210 | 299 | 515 | 741 | 1029 | 1004 | 784 | 743 | 598 | 489 | 388 | |
Swell 2 Height (m) Direction Period (s) | SW 18 | SW 17 | SSW 16 | SSW 12 | SE 10 | SSW 12 | SSW 12 | SSE 9 | SSE 9 | SSE 9 | S 20 | SSW 13 | SSW 13 | W 12 | W 12 | SE 9 | W 12 | SE 12 | SE 12 | SE 13 |
155 | 148 | 104 | 83 | 46 | 79 | 45 | 53 | 54 | 53 | 373 | 277 | 273 | 25 | 11 | 13 | 11 | 21 | 53 | 144 | |
Swell 3 Height (m) Direction Period (s) | S 10 | NE 10 | SSW 18 | SSW 16 | SSW 12 | SSE 10 | SE 8 | SSW 11 | S 11 | SSW 11 | SE 9 | SE 9 | SE 8 | — | SW 19 | W 12 | SW 18 | W 12 | W 11 | W 11 |
17 | 23 | 102 | 100 | 82 | 37 | 18 | 23 | 62 | 41 | 37 | 38 | 35 | — | 14 | 11 | 13 | 11 | 22 | 21 | |
Wind waves Height (m) Direction Period (s) | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 6 | ENE 7 | ENE 6 | E 6 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 |
161 | 165 | 233 | 193 | 225 | 238 | 215 | 208 | 181 | 176 | 146 | 157 | 144 | 225 | 240 | 239 | 362 | 404 | 589 | 916 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 31 | 16 | 16 | 16 | 16 | 31 | 16 | 16 | 31 | 31 | 33 | 31 | 16 | 16 | 16 | 31 | 31 | 31 | 31 | 31 |
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











