Surf Forecasts:
Ammonias surf forecast from 31 Jul 2026:
- Most powerful swell: Sunday 2 Aug, 2AM (local time) - 10ft (3.0m), 8s period, ENE swell with 1,118 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 3.0m 8s and forecast to arrive on Sunday (Aug 02) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Sun 2nd Aug) | 10ft (3.0m) 8s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let’s cut to it – the next 16 days at Ammonias are looking pretty bleak. This reef break faces east, and the swell and wind are just not playing nice for us. The water is running about 80°, which is normal for this time of year.
The first chance you’ll have to even think about a session is Thursday, 11th August. That morning, we’re looking at 3ft swell from the south with a long 15-second period, a light offshore breeze from the ESE, and the combined energy is in the moderate range (634). That’s the pick of the entire outlook. The long period groundswell should give decent shape for a reef, and the light wind means it’ll be clean. But it’s more than a week out, so keep your expectations in check.
Before that, it’s a long stretch of poor to marginal conditions. From Thursday, 30th July through the first week, the wind is mostly cross or cross-onshore, with choppy, lumpy waves. On Saturday, 01st August, there’s a fresh cross-breeze and 8ft of short-period windswell (energy 1171), but it’s messy and not worth paddling out for. That kind of setup is more for kite-surfing than paddle-surfing. The swell is too big and rough for beginners and not clean enough for anyone else.
Tuesday, 12th August, sees a drop to 3ft from the SSW with a 13-second period, but the wind is already cross-onshore, so no good. The last few days fade into small, weak, and messy surf, with energy dropping below 200.
So, your best bet is that Thursday, 11th August morning. Small, clean, long-period south swell, with a light offshore helping it out. It’s not pumping, but it’s the only window with a chance. Expect crowds at Ammonias.
- Rusty
Short Range ForecastLight rain (total 4mm), mostly falling on Sat night. Warm (max 27°C on Thu morning, min 24°C on Sat night). Winds increasing (light winds from the E on Thu morning, fresh winds from the ENE by Sat night). | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Sun morning, min 24°C on Sun morning). Mainly fresh winds. | ||||||||||||||||||||
Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | |||||||||||||||
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 13 | S 13 | S 13 | ENE 7 | ENE 7 | ENE 7 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 12 | ENE 12 | ENE 11 | ENE 10 | ENE 9 | ENE 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 284 | 276 | 206 | 284 | 420 | 645 | 804 | 792 | 1118 | 755 | 715 | 606 | 404 | 339 | 275 | 706 | 648 | 487 | 318 | 237 | 243 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross-on |
High Tide | 4:44PM0.65m | 4:33AM0.29m | 5:08PM0.61m | 5:22AM0.32m | 5:32PM0.57m | 6:19AM0.34m | 5:54PM0.51m | 7:26AM0.38m | 6:14PM0.44m | 8:45AM0.44m | 6:28PM0.37m | 10:10AM0.50m | |||||||||
Low Tide | 9:25AM0.00m | 11:32PM0.11m | 10:03AM0.04m | 11:56PM0.09m | 10:44AM0.09m | 00:22AM0.07m | 11:33AM0.16m | 00:50AM0.05m | 12:35PM0.23m | 1:21AM0.04m | 2:08PM0.29m | 1:58AM0.03m | 2:46AM0.02m | ||||||||
 | |  |  |  |  | | |  | | |  | | | | | | | | |  | |
 | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — |
 | — | 7:17 | — | — | 7:16 | — | — | 7:16 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — |
mm | — | — | — | — | — | — | — | — | 4 | — | — | — | — | — | — | — | — | — | — | — | 2 |
Temp °C | 27 | 27 | 25 | 26 | 26 | 25 | 25 | 26 | 24 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 25 | 25 | 26 | 26 | 25 |
Feels °C | 29 | 28 | 26 | 26 | 25 | 24 | 23 | 24 | 21 | 24 | 24 | 24 | 24 | 25 | 24 | 26 | 26 | 27 | 27 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | NE 8 | S 13 | S 13 | S 12 | SW 15 | SSW 15 | E 15 | E 15 | E 14 | E 14 | E 14 | E 13 | E 13 | E 12 | E 13 | SE 8 | SSW 11 | ENE 11 | ENE 10 | SSW 15 | SE 7 |
| kJ | 192 | 276 | 206 | 146 | 232 | 144 | 205 | 150 | 199 | 194 | 140 | 87 | 86 | 78 | 161 | 33 | 51 | 487 | 318 | 87 | 18 |
Swell 2 Height (m) Direction Period (s) | S 13 | SW 18 | SSW 16 | SSW 16 | S 12 | E 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SW 13 | SSW 13 | SE 6 | SE 9 | SSW 12 | SSE 8 | SSW 11 | SSW 11 | S 12 | SSW 15 |
| kJ | 284 | 152 | 175 | 169 | 141 | 159 | 123 | 123 | 131 | 77 | 68 | 42 | 34 | 14 | 40 | 46 | 23 | 40 | 39 | 46 | 87 |
Swell 3 Height (m) Direction Period (s) | SW 18 | N 9 | N 8 | E 16 | E 15 | S 12 | S 11 | S 11 | S 11 | N 9 | SE 8 | SSW 13 | SE 7 | SSW 12 | SSW 12 | SSW 16 | SW 16 | SSW 15 | SSE 13 | SSW 11 | S 12 |
| kJ | 154 | 6 | 18 | 174 | 167 | 70 | 39 | 38 | 21 | 14 | 18 | 34 | 14 | 50 | 48 | 26 | 69 | 91 | 55 | 38 | 46 |
Wind waves Height (m) Direction Period (s) | — | ENE 8 | E 6 | ENE 7 | ENE 7 | ENE 7 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 12 | ENE 12 | — | — | ENE 9 | ENE 9 |
| kJ | — | 232 | 206 | 284 | 420 | 645 | 804 | 792 | 1118 | 755 | 715 | 606 | 404 | 339 | 275 | 706 | 648 | — | — | 237 | 243 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 14 | 31 | 38 | 38 | 122 | 38 | 46 | 299 | 46 | 38 | 33 | 16 | 31 | 16 | 16 | 31 | 16 | 16 | 31 | 31 | 15 |
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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