
Surf Forecasts:
Ammonias surf forecast from 6 Jul 2026:
- Most powerful swell: Tuesday 7 Jul, 11AM (local time) - 8ft (2.5m), 8s period, ENE swell with 703 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 Tuesday (Jul 07) at 11AM. 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 13s period and expected on Friday (Jul 10) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Tue 7th 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, this is Rusty, and I’m looking at the Ammonias forecast for the next couple of weeks. I gotta be straight with you – it’s a rough stretch ahead for this reef break.
We’re looking at a real quiet run here. There’s no real green light to start, and it’s gonna be a long grind. From Sunday, July 5th, all the way through the end, there’s no standout session to get excited about. The first week is pretty much a write-off.
The water at Ammonias is sitting at 79°F, which is just about standard for this time of year – nothing unusual there.
Let’s talk about the swell. Early on, there’s a long-period groundswell arriving Sunday afternoon 5 July, with 3ft from the SSW and an 18-second period. That sounds nice in theory, but the wave energy is weak (953), and with a 19 mph cross-shore from the ENE, it’s all lumpy and messy. The wave comment says it all: poor surf conditions. That’s not worth paddling out for.
Monday 6 July and Tuesday 7 July see the swell jump up to 7ft to 8ft from the ENE, but the period drops to a short 7 to 8 seconds, so it’s just windswell junk. The wind stays hanging in that cross-shore slot at 19 mph, and that energy climbs into the moderate range (up to 1072), but the quality is still poor to marginal. This is the kind of setup that looks better for a kite than a surfboard – it’s just lumpy cross-chop.
That same pattern hangs around for days. Through the end of the second week, we’re stuck with 5ft to 8ft ENE windswell, short periods, and cross-shore winds blowing at 12 to 19 mph. Most of it is “poor surf conditions,” with a few sessions being just “marginal.”
Honestly, there’s nothing here to recommend. Ammonias needs a cleaner window and a better direction. This is just a long, flat, blustery outlook. Sometimes you get a run like this, and you just wait for the next change. Forecasts can always flip, but right now, I wouldn’t bother suiting up.
Rusty.
Short Range ForecastModerate rain (total 14mm), heaviest on Sun afternoon. Warm (max 25°C on Sun afternoon, min 23°C on Mon night). Mainly fresh winds. | Days 5-7 Weather SummaryHeavy rain (total 22mm), heaviest during Sat morning. Warm (max 26°C on Thu afternoon, min 24°C on Wed night). Mainly fresh winds. | ||||||||||||||||||||
Sun 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | 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 7 | ENE 8 | ENE 8 | ENE 8 | SSW 17 | ENE 8 |
Wave Graph | |||||||||||||||||||||
510 | 437 | 482 | 536 | 566 | 703 | 541 | 464 | 570 | 464 | 415 | 440 | 428 | 400 | 390 | 379 | 481 | 531 | 487 | 386 | 408 | |
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-on | cross | cross | cross | cross | cross | 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 | 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 | 7:03AM-0.10m | ||||||||
— | — | 5:58 | — | — | 5:58 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | |
7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | 7:23 | |
mm | 2 | — | 2 | 1 | 3 | 1 | — | 3 | 2 | 1 | 4 | — | — | 2 | 2 | 2 | 4 | 7 | 4 | — | — |
Temp °C | 25 | 24 | 24 | 25 | 24 | 24 | 25 | 24 | 25 | 25 | 24 | 25 | 26 | 24 | 25 | 26 | 25 | 25 | 25 | 24 | 25 |
Feels °C | 24 | 22 | 22 | 22 | 22 | 21 | 22 | 22 | 23 | 23 | 22 | 24 | 25 | 23 | 25 | 26 | 26 | 24 | 24 | 23 | 24 |
Swell 1 Height (m) Direction Period (s) | 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 11 | SW 19 | SSW 18 | SW 18 | SSW 17 | SW 16 |
510 | 437 | 446 | 481 | 355 | 350 | 341 | 265 | 247 | 239 | 168 | 112 | 108 | 106 | 70 | 66 | 184 | 214 | 316 | 386 | 371 | |
Swell 2 Height (m) Direction Period (s) | SE 9 | SSW 13 | SE 9 | SE 9 | SE 9 | SE 9 | SE 8 | SE 8 | W 16 | SE 9 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | W 13 | W 14 | W 14 | SE 8 | SE 9 | SE 8 |
13 | 69 | 21 | 20 | 20 | 19 | 18 | 18 | 5 | 19 | 11 | 11 | 32 | 28 | 17 | 55 | 59 | 62 | 25 | 36 | 24 | |
Swell 3 Height (m) Direction Period (s) | SSW 11 | SE 9 | S 20 | S 11 | SE 11 | N 9 | W 9 | — | W 16 | S 18 | W 15 | W 14 | W 14 | W 13 | W 14 | SE 8 | SSW 11 | S 11 | W 13 | W 13 | SSE 13 |
12 | 12 | 30 | 2 | 5 | 2 | 2 | — | 5 | 6 | 17 | 15 | 32 | 30 | 36 | 18 | 40 | 39 | 55 | 54 | 54 | |
Wind waves Height (m) Direction Period (s) | 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 7 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 8 |
418 | 412 | 482 | 536 | 566 | 703 | 541 | 464 | 570 | 464 | 415 | 440 | 428 | 400 | 390 | 379 | 481 | 531 | 487 | 379 | 408 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 38 | 31 | 33 | 31 | 31 | 31 | 33 | 38 | 31 | 33 | 16 | 31 | 16 | 16 | 16 | 31 | 16 | 33 | 33 | 31 | 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











