Surf Forecasts:
Ammonias surf forecast from 5 Jul 2026:
- Most powerful swell: Friday 10 Jul, 11PM (local time) - 8ft (2.5m), 8s period, ENE swell with 744 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 2.5m 8s and forecast to arrive on Friday (Jul 10) 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 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11PM (Fri 10th Jul) | 8ft (2.5m) 8s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
Updates in hr min s Forecast update imminent
Alright, let's talk about Ammonias. Water temp is about 79° – right where it should be for this time of year.
The whole 16-day stretch is a tough one. Starting Sunday, July 5th, first thing in the morning, there’s a little hope. Swell is around 3ft from the SSW, with a super long 18-second period – that's real groundswell, carrying some punch with a wave energy reading of 1076. But the wind is blowing cross-shore at about 16 mph from the ENE, putting a nasty chop on the face. Conditions are only marginal at best.
After that, it’s grim. By Monday the 6th, the swell bumps up to around 7ft, but it’s short-period windswell from the ENE at just 7-8 seconds. The wind stays cross and strong, often 19 mph or more, making everything lumpy and hard to read. The wave energy stays moderate to strong (numbers like 500 to over 1000), but it’s just not surfable in a good way.
Ammonias is a reef break that wants a clean SSE swell. Instead, we get the wrong direction and messy wind. The only faint glimmer is that first Sunday morning session on the 5th. That 3ft, 18-second SSW groundswell could produce some long walls if the wind would cooperate, but it doesn’t.
There’s a long stretch of poor-to-marginal surf after that. Even when the wind drops to a gentle 9 mph on Thursday the 16th and Friday the 17th, the swell is still short-period and bumpy. Nothing worth paddling out for.
When the swell is over 5ft from the 6th onward, it’s messy and big. Over 8ft on the 7th and 11th – that’s expert-only stuff, and still not clean. This whole period looks more like a kiteboarding playground than a surfing spot, with that steady cross-wind and consistent energy.
So, bottom line: one iffy window on Sunday morning, July 5th, and then a whole lot of waiting. Forecasts can shift, but right now, don’t hold your breath.
Rusty.
Short Range ForecastModerate rain (total 15mm), heaviest on Sun morning. Warm (max 25°C on Sun morning, min 23°C on Mon night). Mainly fresh winds. | Days 4-6 Weather SummaryModerate rain (total 19mm), heaviest on Fri night. Warm (max 26°C on Thu afternoon, min 24°C on Wed morning). Mainly fresh winds. | ||||||||||||||||||||
Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | |||||||||||||||
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 18 | SSW 18 | SSW 16 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 8 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 522 | 510 | 437 | 462 | 514 | 545 | 653 | 581 | 570 | 522 | 383 | 415 | 440 | 428 | 440 | 542 | 557 | 709 | 623 | 501 | 487 |
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 | cross-on | cross | cross | cross | cross | cross |
High Tide | 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 | 1:33PM0.67m | 11:46PM0.18m | 2:19PM0.73m | 1:06AM0.18m | ||||||||
Low Tide | 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 | 5:17AM-0.06m | 9:34PM0.17m | 6:09AM-0.08m | 10:03PM0.14m | ||||||||
 | |  | | | | |  | | |  |  | | | | | | | | | | |
 | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — |
 | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — |
mm | 1 | 2 | 1 | 1 | 1 | 3 | 2 | — | 4 | 1 | — | — | 2 | 2 | 4 | 2 | 2 | 6 | 1 | — | 1 |
Temp °C | 25 | 25 | 24 | 24 | 25 | 24 | 24 | 25 | 24 | 24 | 25 | 24 | 25 | 26 | 24 | 25 | 25 | 24 | 25 | 25 | 24 |
Feels °C | 24 | 23 | 22 | 22 | 23 | 22 | 22 | 23 | 22 | 22 | 23 | 23 | 24 | 25 | 23 | 25 | 24 | 23 | 23 | 23 | 22 |
Swell 1 Height (m) Direction Period (s) | 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 | S 12 | S 12 | SW 19 | SSW 18 | SW 18 | SSW 17 |
| kJ | 522 | 510 | 437 | 446 | 481 | 355 | 350 | 341 | 265 | 247 | 239 | 168 | 112 | 108 | 75 | 70 | 67 | 184 | 216 | 316 | 386 |
Swell 2 Height (m) Direction Period (s) | SSW 14 | SE 9 | SSW 13 | SE 9 | SE 9 | SE 9 | SE 8 | SE 8 | SE 8 | SE 9 | SE 8 | SE 8 | SE 8 | SSE 8 | SE 6 | W 14 | W 13 | S 11 | S 12 | W 13 | W 13 |
| kJ | 138 | 13 | 69 | 21 | 19 | 20 | 18 | 18 | 18 | 13 | 18 | 17 | 18 | 44 | 20 | 65 | 55 | 39 | 44 | 56 | 55 |
Swell 3 Height (m) Direction Period (s) | SE 9 | SSW 11 | SE 9 | S 20 | SE 10 | NW 9 | N 9 | W 9 | — | W 16 | S 18 | W 15 | W 14 | W 14 | W 13 | SSW 21 | SW 20 | W 13 | W 14 | S 12 | SE 8 |
| kJ | 13 | 12 | 12 | 30 | 4 | 3 | 2 | 2 | — | 5 | 6 | 17 | 15 | 32 | 30 | 45 | 101 | 56 | 62 | 44 | 18 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 8 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
| kJ | 403 | 397 | 376 | 462 | 514 | 545 | 653 | 581 | 570 | 522 | 383 | 415 | 440 | 428 | 440 | 542 | 557 | 709 | 623 | 501 | 487 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 33 | 31 | 33 | 31 | 31 | 31 | 31 | 31 | 33 | 31 | 16 | 31 | 33 | 16 | 31 | 31 | 16 | 31 | 33 | 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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