Surf Forecasts:
Ammonias surf forecast from 21 Jul 2026:
- Most powerful swell: Monday 27 Jul, 8AM (local time) - 4.5ft (1.4m), 16s period, E swell with 923 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 1.4m 16s and forecast to arrive on Monday (Jul 27) at 8AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 8s period and expected on Sunday (Jul 26) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Mon 27th Jul) | 4.5ft (1.4m) 16s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright, listen up. This is the 16-day outlook for Ammonias, and I’m not gonna sugarcoat it. It’s a rough start.
The first couple of days, Tuesday the 21st and Wednesday the 22nd of July, are a total bust. The swell is tiny, the wind is all over the place, and the wave energy is just moderate (568 to 1057). You’re better off waxing your board for the next week. There’s a big gap of nothing worthwhile until we get into the second week.
The one and only real standout in this whole forecast is further out. Mark your calendar for Thursday the 30th of July. The morning session is looking like the pick of the entire run. You’ve got a 2.0m swell from the ENE, with a period of 11 seconds – that’s proper groundswell that will line up on this reef. The wind is a gentle cross-shore from the NE at 15 km/h, so it’s going to be clean and glassy. The wave energy is strong (1224), and with the water temp at 27°, it’s average for this time of year. That’s the one to chase.
Before that, from Thursday the 24th to Wednesday the 29th, it’s all marginal. The swell is there, even getting up to 2.2m, but the wind is always a moderate cross-shore, so there’s always a bit of chop. The period is long (13-16 seconds), so there’s energy, but it’s never clean enough to get really excited.
After that Thursday the 30th, it drops off a cliff. Friday the 31st of July into the first weekend of August, the swell plummets to 0.6m, and the wind turns cross-on. The energy is weak (103 to 278). That’s a total write-off for a paddle. For the kite surfers, the 1.4m to 1.6m cross-shore wind on the 2nd and 3rd of August might look fun, but it’s not a surf day.
For beginners, the 2.0m swell on the 30th is a bit of a step up, but it’s not too big. The 2.2m on the 29th is still manageable.
So, here’s the bottom line: the first week is a don’t-bother. The second week, especially Thursday the 30th of July, is your best shot. It’s a long way off, but it’s the only one that looks worth the wait. Keep your fingers crossed.
Rusty.
Short Range ForecastModerate rain (total 14mm), heaviest on Wed morning. Warm (max 26°C on Tue morning, min 23°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Fri morning. Warm (max 26°C on Fri afternoon, min 23°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | |||||||||||||||
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) | S 15 | S 14 | S 13 | SSW 24 | SSW 23 | SSW 22 | SSW 20 | SSW 20 | SSW 18 | SSW 18 | SSW 17 | ENE 7 | ENE 8 | SSW 18 | SSW 18 | ENE 8 | E 16 | E 16 | E 15 | E 14 | E 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 275 | 320 | 352 | 437 | 564 | 480 | 528 | 399 | 469 | 392 | 379 | 440 | 541 | 731 | 790 | 568 | 585 | 817 | 888 | 687 | 663 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross-on | cross | cross | cross |
High Tide | 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 | 3:20PM0.66m | 2:33AM0.23m | ||||||||||
Low Tide | 3:30AM0.04m | 4:16AM0.04m | 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 | |||||||||||
 |  |  | | |  | | | | |  | | | | | | | | | | | |
 | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — |
 | — | 7:22 | — | — | 7:21 | — | — | 7:21 | — | — | 7:21 | — | — | 7:20 | — | — | 7:20 | — | — | 7:19 | — |
mm | — | 2 | 2 | 5 | 2 | — | 1 | 1 | 1 | 1 | — | 1 | 2 | 1 | 1 | — | — | — | 1 | — | — |
Temp °C | 26 | 26 | 25 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 26 | 24 | 24 | 25 | 24 | 25 | 25 | 24 | 25 | 26 | 24 |
Feels °C | 26 | 26 | 26 | 25 | 25 | 23 | 24 | 24 | 23 | 24 | 25 | 23 | 24 | 24 | 23 | 24 | 23 | 23 | 25 | 26 | 23 |
Swell 1 Height (m) Direction Period (s) | S 15 | S 14 | S 13 | S 14 | SSW 23 | S 13 | SSW 20 | S 13 | SSW 18 | S 12 | SSW 17 | SSW 16 | SSW 19 | SSW 18 | SSW 18 | SSW 16 | E 16 | E 16 | E 15 | E 14 | E 14 |
| kJ | 275 | 320 | 352 | 315 | 564 | 212 | 528 | 219 | 469 | 190 | 340 | 302 | 502 | 731 | 790 | 568 | 585 | 817 | 888 | 687 | 663 |
Swell 2 Height (m) Direction Period (s) | SSW 11 | SW 16 | SSW 26 | SSW 24 | S 13 | SSW 22 | S 13 | SSW 20 | S 13 | SSW 18 | S 12 | S 20 | SSW 16 | S 11 | E 16 | E 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 |
| kJ | 50 | 65 | 224 | 437 | 173 | 480 | 209 | 399 | 123 | 356 | 141 | 404 | 223 | 61 | 83 | 382 | 452 | 416 | 288 | 284 | 273 |
Swell 3 Height (m) Direction Period (s) | SW 17 | E 15 | SE 6 | E 12 | S 10 | E 12 | SSW 16 | E 12 | S 11 | ENE 10 | S 21 | S 12 | S 12 | E 14 | E 13 | S 11 | S 11 | SSE 11 | S 10 | S 11 | S 10 |
| kJ | 72 | 38 | 9 | 73 | 80 | 103 | 100 | 98 | 56 | 34 | 326 | 97 | 95 | 65 | 55 | 36 | 35 | 12 | 17 | 20 | 8 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
| kJ | 171 | 163 | 186 | 212 | 240 | 151 | 423 | 302 | 350 | 392 | 379 | 440 | 541 | 453 | 502 | 536 | 372 | 344 | 234 | 264 | 250 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 16 | 16 | 33 | 16 | 16 | 33 | 33 | 16 | 33 | 31 | 16 | 16 | 31 | 16 | 16 | 31 | 31 | 31 | 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
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