Surf Forecasts:
Ammonias surf forecast from 8 Jul 2026:
- Most powerful swell: Thursday 9 Jul, 5AM (local time) - 8ft (2.4m), 8s period, ENE swell with 655 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 2.4m 8s and forecast to arrive on Thursday (Jul 09) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 15s period and expected on Wednesday (Jul 15) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Thu 9th Jul) | 8ft (2.4m) 8s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
Alright, Rusty here again. Let’s break down the same stretch but in feet and miles per hour.
It’s gonna be a quiet, ugly start. From Wednesday the 8th of July through the weekend, it’s just no good. The wind is out of the ENE, blowing 15 to 19 mph as a cross or cross-onshore, and it’s making a mess of the ocean. The swell is running 6 ft to 7 ft, but it’s short-period windswell (around 8 seconds) coming from the ENE, so the waves are gonna be lumpy and un-rideable. The energy numbers are moderate (460 to 837), but that doesn’t mean anything when the wind is wrecking the surface. For a reef break like this, it’s a hard pass.
The second week gets a little more interesting. Starting around Monday the 20th of July, the swell shifts to the south and the period jumps way up to 15 to 17 seconds—that’s proper groundswell, with strong energy numbers hitting over 1,068 on Tuesday the 21st and 1,321 on Wednesday the 22nd. That’s some real power. But the wind stays a stubborn cross-onshore from the ENE at 12 mph, so the face is still gonna be choppy. On Wednesday afternoon the 22nd, the wind goes cross-shore, and that’s your best shot: a 3 ft swell at 15 seconds from the east with moderate cross-shore wind. It’s not clean, but it’s the only window that’s even close.
Bottom line: there’s nothing that really stands out. The reef needs that clean SSE swell to fire, and with all this wind, you’re better off waiting it out.
Rusty.
Short Range ForecastHeavy rain (total 20mm), heaviest during Thu morning. Warm (max 25°C on Wed morning, min 24°C on Wed morning). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Sat morning. Warm (max 25°C on Sat afternoon, min 23°C on Mon night). Mainly fresh winds. | ||||||||||||||||||||
Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | |||||||||||||||
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 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 8 | ENE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 495 | 464 | 604 | 570 | 434 | 443 | 356 | 297 | 394 | 475 | 389 | 423 | 389 | 403 | 447 | 439 | 353 | 294 | 327 | 270 | 294 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 11:53AM0.50m | 8:28PM0.28m | 12:45PM0.59m | 9:34PM0.22m | 1:33PM0.67m | 11:46PM0.18m | 2:19PM0.73m | 1:06AM0.18m | 3:04PM0.77m | 2:08AM0.19m | 3:47PM0.78m | 3:04AM0.21m | 4:29PM0.77m | 3:58AM0.23m | |||||||
Low Tide | 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 | 10:34PM0.12m | 7:55AM-0.11m | 11:06PM0.11m | 8:46AM-0.10m | 11:38PM0.10m | ||||||||
 | |  | | | | | | | |  |  |  | | | | | | | | | |
 | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — |
 | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:22 | — |
mm | 1 | 2 | 3 | 4 | 2 | 1 | 1 | 2 | 4 | 1 | — | — | — | 2 | 4 | 1 | 1 | — | — | 1 | 4 |
Temp °C | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 24 | 25 | 24 | 25 | 25 | 24 | 24 | 25 | 24 | 25 | 25 | 24 |
Feels °C | 23 | 23 | 22 | 24 | 24 | 23 | 24 | 24 | 23 | 23 | 23 | 23 | 24 | 24 | 23 | 23 | 24 | 23 | 24 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | 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 | SW 16 | SW 16 | SSW 15 | SSW 14 | SW 14 | SSW 14 | SSW 14 | W 15 |
| kJ | 247 | 239 | 168 | 151 | 108 | 106 | 98 | 66 | 184 | 214 | 316 | 386 | 371 | 367 | 353 | 279 | 268 | 206 | 236 | 232 | 287 |
Swell 2 Height (m) Direction Period (s) | SE 9 | SE 9 | SE 8 | SE 8 | SE 6 | W 13 | W 14 | W 13 | S 11 | S 12 | S 12 | S 13 | SSE 12 | SSE 12 | SSE 12 | W 19 | W 18 | W 17 | W 16 | W 16 | SSW 13 |
| kJ | 13 | 19 | 18 | 11 | 9 | 30 | 65 | 55 | 61 | 44 | 44 | 51 | 50 | 49 | 48 | 112 | 150 | 143 | 186 | 245 | 109 |
Swell 3 Height (m) Direction Period (s) | W 16 | S 18 | W 15 | W 14 | SE 8 | SE 6 | SSE 8 | SW 20 | W 14 | W 14 | W 13 | W 13 | W 12 | SE 8 | SE 8 | SSE 12 | SSE 12 | SSE 11 | SSW 19 | SW 19 | SSW 17 |
| kJ | 5 | 6 | 17 | 15 | 17 | 6 | 6 | 101 | 59 | 61 | 54 | 53 | 47 | 18 | 17 | 46 | 44 | 40 | 146 | 93 | 197 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 8 | ENE 7 |
| kJ | 495 | 464 | 604 | 570 | 434 | 443 | 356 | 297 | 394 | 475 | 389 | 423 | 389 | 403 | 447 | 439 | 353 | 294 | 327 | 270 | 294 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 33 | 33 | 38 | 33 | 126 | 16 | 31 | 31 | 16 | 31 | 31 | 16 | 31 | 33 | 16 | 31 | 31 | 16 | 16 | 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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