
Surf Forecasts:
Ammonias surf forecast from 24 Jul 2026:
- Best quality surf: Wednesday 29 Jul, 2PM (local time) - 10ft (3.0m), 11s period, ENE swell with cross-offshore winds.
- Most powerful swell: Wednesday 29 Jul, 2PM (local time) - 10ft (3.0m), 11s period, ENE swell with 1,789 kJ wave energy.
- Next surfable swell (1★+): Wednesday 29 Jul, 2PM (local time) - 10ft (3.0m), 11s period with ENE 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 Wednesday (Jul 29) at 2PM. The primary swell is predicted to be 3.0m and 11s period with a secondary swell of 0.8m and 14s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Ammonias in the next 16 days are 3.0m 11s and forecast to arrive on Wednesday (Jul 29) at 2PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 8s period and expected on Tuesday (Jul 28) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Wed 29th Jul) | 10ft (3.0m) 11s |
| Best Surf | 2PM (Wed 29th Jul) | 10ft (3.0m) 11s |
| Most Powerful | 2PM (Wed 29th Jul) | 10ft (3.0m) 11s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright, Rusty here, let’s talk about what’s cooking at Ammonias.
Look, I’m gonna be straight with you – the next couple of weeks aren’t exactly going to have us scrambling for the wax. It’s a bit of a mixed bag, with a lot of marginal conditions and some proper lumpy, cross-onshore stuff. The water is sitting at a warm 80°, which is pretty standard for this time of year, so no surprises there.
We kick off Thursday the 23rd of July, but it’s a real struggle. We’ve got some small swell, around 3ft to 3ft, coming from the SSW, but it’s wrapped in a choppy, cross-onshore wind. The combined energy is still pretty meaty at 1141, but it’s just messy. Not the one.
Friday the 24th is a bit of a weird one. The morning sees a jump in size to 7ft, but it’s a short-period 7-second ENE windswell with a nasty cross-shore wind. That’s going to be a lumpy, bumpy mess. The afternoon cleans up a little with a long-period 17-second SSW groundswell at 3ft, but the wind is still cross. It’s a frustrating tease.
The weekend and into the following week is a real grind. Swell stays in the 3ft to 3ft range, mostly SSW groundswell through Saturday, but the wind never really gets out of the cross-shore zone. Sunday the 26th is the best of the early bunch, with clean skies and a moderate cross-shore breeze, but the waves are small and the energy is dropping. Monday the 27th sees the swell shift to the east and the energy takes a real dive down to 650, so it’s pretty weak.
Now, here’s where it gets a little interesting. Tuesday the 28th of July, the swell bumps up to 6ft from the ENE with a 13-second period, and the energy is building back up to 1324. The wind turns more cross-offshore on Tuesday afternoon, with the swell at 7ft, and the report says "clean". That’s our first real window of decent shape. For a reef break that’s fairly consistent and exposed to the swell, this is a decent look.
Wednesday the 29th of July is the standout, but it comes with a big caveat. The morning is looking good – 8ft of ENE swell, 11-second period, and a clean cross-offshore breeze. The energy is pumping at 1471. That’s the best we’re going to see. But, the afternoon turns into a risk of thunderstorms with a 12 mph onshore wind, and the swell jumps to 8ft on a short 10-second period. That’s a major drop in quality. The morning is the window, but be aware that 8ft is getting a bit big for beginners, and the long period groundswell might make it a bit fat and straight on a beach break, but it should shape up nicely on the reef.
After that, it’s a rough slide. The end of July and start of August are dominated by short-period, 7-second ENE windswell in the 5ft to 6ft range, with fresh cross-shore winds making it lumpy. It’s a tough stretch of poor to marginal conditions. The combined energy is dropping, too.
We get a bit of a reprieve on August 5th with a jump back up to 7ft from the ENE at 12 seconds, with moderate cross-shore winds. It’s still marginal, but the energy is solid at 1307. It’s a promise, but it’s a long way out.
Honestly, for the whole 16 days, the only real standout is the Wednesday morning (July 29th) session at Ammonias. The 8ft of long-period ENE groundswell with clean cross-offshore wind is the best combination on offer. The morning of Tuesday the 28th is also a decent second option if you can’t wait. The rest of the time, it’s a lot of paddling for not much reward.
Signing off, Rusty.
Short Range ForecastModerate rain (total 13mm), heaviest on Thu morning. Warm (max 26°C on Thu afternoon, min 23°C on Fri night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Tue night. Warm (max 26°C on Sun afternoon, min 23°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | |||||||||||||||
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) | SSW 20 | SSW 20 | SSW 18 | ENE 7 | SSW 17 | ENE 7 | SSW 19 | SSW 18 | SSW 18 | SSW 16 | SSW 16 | SSW 16 | E 14 | E 14 | E 13 | ENE 13 | ENE 12 | E 12 | ENE 11 | ENE 10 | ENE 9 |
Wave Graph | |||||||||||||||||||||
528 | 399 | 469 | 431 | 428 | 440 | 627 | 731 | 790 | 575 | 452 | 416 | 368 | 357 | 336 | 1116 | 1217 | 409 | 1186 | 1480 | 589 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-off | cross-off | cross-off | on | on |
High Tide | 12:55PM0.57m | 1:36PM0.61m | 00:21AM0.18m | 2:14PM0.63m | 1:16AM0.20m | 2:48PM0.65m | 1:57AM0.21m | 3:20PM0.66m | 2:33AM0.23m | 3:50PM0.67m | 3:10AM0.25m | 4:18PM0.66m | 3:49AM0.27m | ||||||||
Low Tide | 5:07AM0.04m | 10:06PM0.17m | 6:00AM0.03m | 10:10PM0.16m | 6:48AM0.01m | 10:20PM0.16m | 7:31AM-0.01m | 10:33PM0.16m | 8:11AM-0.02m | 10:50PM0.15m | 8:48AM-0.01m | 11:10PM0.13m | |||||||||
6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | |
— | 7:21 | — | — | 7:21 | — | — | 7:20 | — | — | 7:20 | — | — | 7:19 | — | — | 7:19 | — | — | 7:17 | — | |
mm | 1 | — | 2 | 1 | 1 | 2 | 2 | 1 | 3 | — | — | — | — | — | — | — | — | 2 | 2 | 2 | 9 |
Temp °C | 25 | 26 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 26 | 24 | 25 | 26 | 24 | 26 | 26 | 25 | 25 | 27 | 26 |
Feels °C | 23 | 25 | 23 | 23 | 24 | 22 | 25 | 23 | 23 | 23 | 25 | 23 | 24 | 25 | 23 | 25 | 26 | 25 | 26 | 29 | 27 |
Swell 1 Height (m) Direction Period (s) | SSW 20 | S 13 | SSW 18 | S 12 | SSW 17 | SSW 16 | SSW 19 | SSW 18 | SSW 18 | SSW 16 | SSW 16 | SSW 16 | E 14 | E 14 | E 13 | SSW 14 | SSW 13 | E 12 | ENE 11 | ENE 10 | ENE 9 |
528 | 219 | 469 | 190 | 428 | 302 | 627 | 731 | 790 | 575 | 452 | 416 | 368 | 357 | 336 | 189 | 141 | 409 | 1186 | 1480 | 589 | |
Swell 2 Height (m) Direction Period (s) | S 13 | SSW 20 | S 13 | SSW 18 | S 12 | S 20 | SSW 16 | S 11 | E 13 | E 15 | E 15 | E 14 | SSW 15 | SSW 15 | SSW 14 | SE 8 | SE 8 | SSW 13 | S 14 | S 14 | S 14 |
209 | 399 | 123 | 356 | 138 | 404 | 196 | 63 | 53 | 68 | 208 | 329 | 288 | 284 | 213 | 11 | 18 | 137 | 268 | 261 | 297 | |
Swell 3 Height (m) Direction Period (s) | SW 16 | E 12 | SSE 7 | S 22 | S 21 | S 12 | S 12 | E 14 | E 16 | E 12 | S 11 | SSE 11 | SE 11 | SE 6 | SE 11 | S 10 | S 16 | S 16 | SW 21 | SSW 19 | SW 19 |
64 | 98 | 36 | 86 | 326 | 100 | 95 | 33 | 45 | 47 | 20 | 12 | 18 | 9 | 18 | 8 | 46 | 77 | 17 | 37 | 58 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | NE 7 | ENE 7 | ENE 13 | ENE 12 | NE 8 | NNE 7 | SE 5 | SSE 4 |
340 | 308 | 316 | 431 | 390 | 440 | 483 | 545 | 560 | 430 | 327 | 310 | 320 | 330 | 250 | 1116 | 1217 | 527 | 191 | 49 | 6 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 33 | 38 | 16 | 31 | 33 | 16 | 31 | 33 | 33 | 31 | 16 | 16 | 31 | 31 | 16 | 16 | 31 | 14 | 14 | 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










