Surf Forecasts:
Ammonias surf forecast from 2 Aug 2026:
- Most powerful swell: Sunday 2 Aug, 2AM (local time) - 8ft (2.5m), 8s period, ENE swell with 976 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 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) | 8ft (2.5m) 8s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Hey, Rusty here. To be honest, the outlook for Ammonias over the next 16 days is pretty rough. This is a reef break that needs everything to line up, and it’s just not happening. No real standouts, just messy conditions.
We kick off Saturday, August 1st, with a 8ft swell out of the ENE, but the wind is howling at 19 mph from the same direction, making for a lumpy, cross-shore mess. The water’s a warm 80°, which is normal for this time of year. The combined swell energy is strong at 1118, but with an 8-second period, it’s just windswell. Sunday the 2nd and Monday the 3rd are more of the same – 8ft down to 5ft of short-period, sloppy swell with cross-shore winds. Not worth a look.
Tuesday the 4th is the only halfway decent day, with a 5ft swell from the ENE but a 12-second period – that’s proper groundswell. The wind is lighter at 9 mph, still cross-shore, but it’s the best shot. The combined energy is 660, moderate. After that, it’s downhill: Wednesday the 5th to Friday the 7th sees the swell drop to 5ft and smaller, winds turn cross-onshore, and it’s all very poor.
From Saturday the 8th through to Sunday the 16th, we get some pulses, like a 6ft ENE swell on the 8th with a short 7-second period and 16 mph cross-shore wind, or a longer-period S swell around the 12th to 14th (14-18 seconds) that hits 4ft to 4ft. But with the wind staying cross or cross-onshore at 16-19 mph, it’s all choppy and unrideable. The combined energy hits 1065 on the 12th afternoon, but it’s wasted energy.
Bottom line: this 16-day window is a write-off for decent surf at Ammonias. The reef needs clean conditions, and we’re not getting them. Forecasts can change, but for now, the board stays in the car.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Sat night. Warm (max 26°C on Sat afternoon, min 24°C on Sat night). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Wed morning. Warm (max 26°C on Thu morning, min 24°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Sat 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | ||||||||||||||
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 8 | ENE 8 | ENE 8 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 9 | ENE 8 | ENE 8 | ENE 6 | ENE 7 | SW 20 | ENE 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 807 | 976 | 820 | 642 | 504 | 402 | 306 | 299 | 583 | 524 | 572 | 380 | 312 | 232 | 173 | 165 | 81 | 147 | 98 | 148 |
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 | cross-on | cross | cross | cross-on | cross-on | cross | cross | cross | cross |
High Tide | 5:32PM0.57m | 6:19AM0.34m | 5:54PM0.51m | 7:26AM0.38m | 6:14PM0.44m | 8:45AM0.44m | 6:28PM0.37m | 10:10AM0.50m | 11:24AM0.57m | 12:26PM0.64m | ||||||||||
Low Tide | 00:22AM0.07m | 11:33AM0.16m | 00:50AM0.05m | 12:35PM0.23m | 1:21AM0.04m | 2:08PM0.29m | 1:58AM0.03m | 2:46AM0.02m | 3:47AM0.01m | 4:56AM-0.01m | ||||||||||
 |  | | |  |  | | |  | |  |  | |  | | | | | | | |
 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — |
 | 7:16 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:14 | — | — | 7:13 | — |
mm | — | 2 | — | — | — | — | — | — | — | — | — | 1 | 2 | 1 | — | — | 2 | — | — | 1 |
Temp °C | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 25 | 24 | 25 | 25 | 25 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 24 | 23 | 24 | 24 | 23 | 24 | 25 | 25 | 26 | 26 | 25 | 26 | 26 | 27 | 27 | 27 | 27 | 26 | 26 | 25 |
Swell 1 Height (m) Direction Period (s) | E 15 | E 14 | E 14 | E 14 | E 13 | E 13 | E 13 | E 12 | SSW 12 | SSW 12 | SSW 11 | SSW 11 | SSW 15 | ENE 9 | SSW 14 | SSW 14 | ENE 8 | SE 7 | SSW 14 | SSW 14 |
| kJ | 150 | 199 | 194 | 140 | 123 | 86 | 84 | 104 | 46 | 53 | 68 | 39 | 87 | 232 | 81 | 80 | 42 | 27 | 74 | 111 |
Swell 2 Height (m) Direction Period (s) | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SE 7 | SE 6 | SSW 12 | SSW 12 | SSE 9 | SE 8 | SSW 15 | SSE 13 | SSW 11 | SSW 15 | SSE 11 | SSE 11 | SSW 14 | SSW 14 | SE 7 | SE 8 |
| kJ | 123 | 131 | 77 | 68 | 14 | 10 | 50 | 48 | 31 | 18 | 91 | 55 | 38 | 86 | 43 | 42 | 81 | 78 | 24 | 31 |
Swell 3 Height (m) Direction Period (s) | S 11 | S 11 | N 9 | SE 8 | SW 13 | SSW 13 | SE 7 | SE 6 | W 13 | SW 16 | SSE 13 | SW 15 | SSE 12 | S 12 | SE 8 | SSW 10 | S 11 | S 10 | SW 20 | SSW 19 |
| kJ | 38 | 21 | 14 | 16 | 42 | 34 | 14 | 10 | 31 | 69 | 58 | 60 | 49 | 46 | 17 | 18 | 39 | 19 | 98 | 148 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | — | ENE 8 | ENE 8 | ENE 6 | ENE 7 | ENE 5 | ENE 6 |
| kJ | 807 | 976 | 820 | 642 | 504 | 402 | 306 | 299 | 583 | 524 | 572 | 380 | 312 | — | 173 | 165 | 74 | 147 | 62 | 135 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 127 | 38 | 33 | 31 | 16 | 31 | 31 | 16 | 31 | 31 | 16 | 31 | 16 | 10 | 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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