
Surf Forecasts:
Ammonias surf forecast from 3 Jul 2026:
- Most powerful swell: Saturday 4 Jul, 11PM (local time) - 3ft (0.9m), 19s period, SSW swell with 627 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 0.9m 19s and forecast to arrive on Saturday (Jul 04) at 11PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 14s period and expected on Friday (Jul 10) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11PM (Sat 4th Jul) | 3ft (0.9m) 19s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
Updates in hr min s Forecast update imminent
Hey, Rusty again, now in feet and Fahrenheit for the imperial crew.
We’re starting the outlook for Ammonias with a bit of a gap before anything’s rideable. First surf shows Friday the 3rd of July, but it’s nothing to write home about.
Friday morning brings a 5ft swell from the ENE with a short 8-second interval. A moderate cross-shore wind from the same direction, showers in the air, and the combined energy sits at 639 (moderate). The water’s 79°, which is pretty normal for this time of year. The wind’s gonna mess up the surface, so it’s not gonna be clean. If you’re desperate for a paddle, you could, but don’t expect much.
Saturday the 4th, the swell drops to around 3ft but here’s the interesting bit: long-period groundswell from the south, 21 seconds. The energy jumps up strong to 1194. Problem is, the wind is still cross-shore from the NE at 25 km/h. For a reef like Ammonias, that long period can mean better shape in the right spot, but the wind kills it. It’s still a poor-quality call from the data.
Sunday the 5th is much the same – small 3ft groundswell from the south-southwest at 18 seconds, but still cross-shore breezes. The energy is moderate to strong (1025), but you’re getting chopped up. Monday the 6th rolls around and we jump back to a short-period 7ft ENE swell with moderate cross wind. That’s getting into expert-only territory size-wise. The energy’s moderate at 966, but again, poor conditions.
From Monday the 6th all the way through the 18th of July, nothing really improves. Wind is stuck on moderate ENE cross or cross-on. Thursday the 14th is the best-rated session with a tiny 3ft south-southwest groundswell, a light cross-onshore breeze, and an energy reading of 541. That’s about as good as it gets – which isn’t saying much. Everything else is poor or marginal.
There’s no real standout here. The closest to a pick would be Saturday the 4th morning because of the super long-period south swell, but the wind never cleans up. Ammonias is an exposed reef that can produce when conditions align, but they don’t this time. Over 16 days, there’s barely a session worth paddling out for. A blank run like this is more typical for the area when the trade winds lock in. Forecasts can shift, but don’t hold your breath. Keep the board in the bag.
Rusty.
Short Range ForecastModerate rain (total 13mm), heaviest on Fri morning. Warm (max 25°C on Fri morning, min 24°C on Fri morning). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 11mm), heaviest on Mon afternoon. Warm (max 25°C on Mon morning, min 23°C on Mon night). Mainly fresh winds. | ||||||||||||||||||||
Friday 3 | Saturday 4 | Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | |||||||||||||||
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 | ENE 8 | ENE 8 | S 21 | S 20 | SSW 19 | SSW 18 | SSW 18 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph | |||||||||||||||||||||
302 | 347 | 382 | 573 | 490 | 608 | 522 | 510 | 516 | 469 | 481 | 501 | 559 | 451 | 526 | 397 | 411 | 417 | 405 | 319 | 258 | |
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 | cross | cross | cross | cross | cross | cross-on | cross-on | cross | cross-on | cross-on | cross | cross-on |
High Tide | 6:17PM0.59m | 6:37AM0.22m | 6:44PM0.55m | 8:00AM0.26m | 7:11PM0.49m | 9:31AM0.32m | 7:37PM0.42m | 10:50AM0.41m | 8:03PM0.35m | 11:53AM0.50m | 8:28PM0.28m | 12:45PM0.59m | 9:34PM0.22m | ||||||||
Low Tide | 10:47AM0.04m | 1:33AM0.09m | 11:30AM0.10m | 2:02AM0.07m | 12:26PM0.17m | 2:33AM0.05m | 1:48PM0.24m | 3:07AM0.02m | 3:53PM0.29m | 3:45AM-0.01m | 6:49PM0.27m | 4:28AM-0.03m | 9:16PM0.22m | ||||||||
5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 6:00 | — | — | 6:00 | — | — | |
— | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | |
mm | 1 | 1 | 3 | 1 | — | 1 | 2 | 2 | 2 | — | 2 | 2 | — | — | 4 | 1 | — | 2 | 2 | 1 | 2 |
Temp °C | 25 | 25 | 24 | 25 | 25 | 24 | 24 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 26 | 24 |
Feels °C | 24 | 24 | 23 | 23 | 23 | 22 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 24 | 25 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 17 | SSW 17 | SSW 16 | S 21 | S 20 | SSW 19 | SSW 18 | SSW 18 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | S 13 | S 12 | S 12 | S 12 |
232 | 216 | 147 | 573 | 490 | 608 | 522 | 510 | 437 | 446 | 481 | 355 | 350 | 341 | 265 | 247 | 239 | 168 | 151 | 110 | 75 | |
Swell 2 Height (m) Direction Period (s) | SSW 13 | SSW 13 | SSW 13 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SE 9 | SSW 13 | SE 9 | SE 9 | SE 9 | SE 8 | SE 8 | SSE 8 | SE 9 | SE 8 | SE 8 | SE 8 | SE 8 | W 14 |
67 | 62 | 93 | 193 | 148 | 188 | 138 | 12 | 69 | 21 | 20 | 19 | 18 | 18 | 7 | 20 | 11 | 33 | 17 | 31 | 63 | |
Swell 3 Height (m) Direction Period (s) | SE 9 | SE 9 | S 23 | SSW 12 | SW 12 | SE 10 | SE 9 | SSW 11 | SE 9 | S 20 | SE 10 | NW 9 | — | W 9 | — | W 19 | S 18 | W 17 | W 16 | W 15 | SE 8 |
38 | 27 | 260 | 56 | 35 | 15 | 12 | 12 | 12 | 30 | 4 | 3 | — | 2 | — | 7 | 6 | 23 | 20 | 39 | 16 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
302 | 347 | 382 | 372 | 345 | 389 | 353 | 344 | 516 | 469 | 471 | 501 | 559 | 451 | 526 | 397 | 411 | 417 | 405 | 319 | 258 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 16 | 16 | 31 | 31 | 16 | 31 | 31 | 31 | 31 | 46 | 31 | 31 | 31 | 33 | 31 | 31 | 16 | 31 | 16 | 16 |
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










