
Surf Forecasts:
Ammonias surf forecast from 21 Jul 2026:
- Most powerful swell: Monday 27 Jul, 11AM (local time) - 5ft (1.5m), 15s period, E swell with 979 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 1.5m 15s and forecast to arrive on Monday (Jul 27) 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 1.8m 7s period and expected on Monday (Jul 27) at 8AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Mon 27th Jul) | 5ft (1.5m) 15s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright, Rusty here, and I've got a long look ahead for us at Ammonias. Let's be honest, it's a bit of a mixed bag over the next couple of weeks, so let's get straight into it.
The water is sitting at 80°, which is about 0.5° warmer than usual for this time of year. Nothing wild, just a touch of warmth.
We're starting off slow. The first few days, from Monday the 20th through to the end of the week, are a real struggle. The swell is weak and the wind is a messy cross-shore, keeping things chopped up. The wave energy is moderate at best, going from 543 up to 1182, but the quality just isn't there. The forecast calls it marginal or poor, and I trust that. It's a lot of movement in the water, but not the kind that makes for a good ride. You'll be battling a cross-chop.
Now, we hit a bit of a dry spell. Friday the 24th afternoon through to the 27th, we see some size and a bump in energy, with the swell climbing to 5 ft from the ENE and E, but it's still that cross-shore wind. The period is short, around 7 to 8 seconds, so the waves will be a bit weak and crumbly. The energy levels are moderate to strong (1242 to 1812), but the conditions are described as marginal. It's surfable, but not a standout.
The real standout window, the one that has me packing my bags, starts on the 29th of July. The Wednesday morning and afternoon are looking like the best on offer. We’ve got a 7 ft to 8 ft swell from the ENE, with a 13-second period. That's a nice, long groundswell that will wrap in with some proper punch. The combined energy is a solid 1933 to 1949, which is strong wave energy. The wind is a gentle breeze from the ENE and NE, which is a clean cross-shore. This is the one to target. The crowd situation at Ammonias is often busy, so you'll want to be up early for a piece of it. The size is hefty, over 7 ft, so this is strictly for the experienced crew.
After that little burst, things drop off again. The 30th of July sees a fade to smaller, weaker S swell, and the wind swings cross-onshore, making a mess of things. The energy drops to 327, which is weak. It's a dead zone again.
The second week of the forecast, from the 31st of July, is pretty lackluster. The swell stays small, mostly from the ENE with a short 8-second period, and the wind is either cross or cross-onshore. The energy is low, between 321 and 607. The 31st of July afternoon has a little bump to 5 ft, but it's still a short-period, weak swell, and the conditions are described as poor. It's not looking worth the paddle.
So, to sum it up: the best bet is the Wednesday the 29th of July. That's your window for a proper, powerful groundswell. Everything else is a bit of a grind or a flat spell. Keep an eye on that date.
Rusty, signing off.
Short Range ForecastModerate rain (total 17mm), heaviest on Tue night. Warm (max 26°C on Mon morning, min 24°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Thu night. Warm (max 26°C on Thu afternoon, min 23°C on Fri night). Mainly fresh winds. | ||||||||||||||||||||
Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | |||||||||||||||
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 7 | ENE 7 | ENE 7 | S 15 | S 14 | S 13 | SSW 24 | SSW 23 | SSW 22 | SSW 20 | SSW 20 | SSW 18 | SSW 18 | SSW 17 | ENE 8 | ENE 8 | SSW 18 | SSW 18 | E 16 | E 16 | E 15 |
Wave Graph | |||||||||||||||||||||
220 | 234 | 178 | 275 | 320 | 352 | 437 | 564 | 480 | 528 | 399 | 469 | 356 | 456 | 557 | 520 | 731 | 662 | 732 | 838 | 736 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross-on | cross-on | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 9:50AM0.41m | 7:25PM0.35m | 11:06AM0.46m | 12:06PM0.52m | 12:55PM0.57m | 1:36PM0.61m | 00:21AM0.18m | 2:14PM0.63m | 1:16AM0.20m | 2:48PM0.65m | 1:57AM0.21m | ||||||||||
Low Tide | 2:53PM0.29m | 2:52AM0.04m | 3:30AM0.04m | 4:16AM0.04m | 5:07AM0.04m | 10:06PM0.17m | 6:00AM0.03m | 10:10PM0.16m | 6:48AM0.01m | 10:20PM0.16m | |||||||||||
6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — | |
— | 7:22 | — | — | 7:22 | — | — | 7:21 | — | — | 7:21 | — | — | 7:21 | — | — | 7:20 | — | — | 7:20 | — | |
mm | 1 | — | — | 2 | 2 | 7 | 5 | — | — | — | — | 2 | 2 | 1 | — | 1 | 1 | 1 | — | — | — |
Temp °C | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 25 | 24 | 25 | 26 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 |
Feels °C | 25 | 24 | 24 | 26 | 26 | 26 | 24 | 24 | 23 | 24 | 25 | 23 | 23 | 23 | 22 | 24 | 24 | 22 | 24 | 23 | 22 |
Swell 1 Height (m) Direction Period (s) | SSW 12 | S 16 | S 12 | S 15 | S 14 | S 13 | S 14 | S 13 | S 13 | SSW 20 | S 13 | SSW 18 | SSW 18 | SSW 17 | SSW 16 | SSW 19 | SSW 18 | SSW 18 | E 16 | E 16 | E 15 |
104 | 188 | 110 | 275 | 320 | 352 | 311 | 280 | 212 | 528 | 219 | 469 | 356 | 428 | 302 | 502 | 731 | 662 | 732 | 838 | 736 | |
Swell 2 Height (m) Direction Period (s) | S 16 | SSW 11 | S 15 | SSW 11 | SW 16 | SSW 26 | SSW 24 | SSW 23 | SSW 22 | S 13 | SSW 20 | S 13 | S 12 | S 12 | S 20 | SSW 16 | E 15 | E 17 | SSW 16 | S 16 | SSW 16 |
137 | 64 | 163 | 50 | 65 | 224 | 437 | 564 | 480 | 209 | 399 | 85 | 145 | 138 | 408 | 223 | 153 | 459 | 568 | 522 | 416 | |
Swell 3 Height (m) Direction Period (s) | SW 18 | SW 18 | SW 16 | SW 17 | E 15 | SW 15 | E 12 | E 12 | E 12 | E 12 | E 12 | S 11 | ENE 10 | S 21 | S 12 | S 12 | S 11 | S 11 | S 11 | SSE 12 | S 12 |
82 | 80 | 69 | 72 | 38 | 60 | 73 | 103 | 103 | 103 | 96 | 56 | 34 | 326 | 97 | 95 | 61 | 37 | 36 | 14 | 3 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
220 | 234 | 178 | 176 | 180 | 200 | 247 | 181 | 195 | 342 | 240 | 371 | 330 | 456 | 557 | 520 | 458 | 564 | 476 | 392 | 372 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 16 | 16 | 31 | 31 | 16 | 46 | 38 | 16 | 33 | 31 | 16 | 31 | 31 | 16 | 16 | 31 | 16 | 16 | 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










