
Surf Forecasts:
Ammonias surf forecast from 19 Jul 2026:
- Most powerful swell: Saturday 25 Jul, 5PM (local time) - 3.5ft (1.0m), 18s period, SSW swell with 724 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 1.0m 18s and forecast to arrive on Saturday (Jul 25) at 5PM. 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 | 5PM (Sat 25th Jul) | 3.5ft (1.0m) 18s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
G’day, Rusty here, and I’ve got to be straight with you – it’s a tough stretch ahead for Ammonias. We’re looking at a 16-day run that starts with nothing but frustration, and it takes a while before anything even comes close to worth paddling out for.
Right now, from Saturday the 18th of July, it’s a write-off. The swell is coming from the wrong direction (ENE) for this reef, so it’s cross-on wind with a 6ft to 5ft mess that’s choppy and poor. The combined energy is moderate (570), but it doesn’t matter – the wind and direction are against us. This junk continues straight through Saturday the 18th, all of Sunday the 19th, and into Monday the 20th. Nothing to ride here.
Then, on Tuesday the 21st of July, we finally see a shift. The wind is still cross (moderate breeze at 12 mph), but the swell direction swings around to the S with a 3ft, and the period jumps to 15 seconds. That’s a proper groundswell, and the energy is moderate (598). The forecast says “marginal surf conditions or questionable tide,” so it’s not a standout, but it’s the first real chance. The water’s sitting at 80°, which is about average for this time of year. Wednesday the 22nd and Thursday the 23rd stay small with that south-southwest groundswell, peaking at 3ft and a period of 20 seconds. The energy is strong (1122 to 1036), but the wind is still cross or onshore, keeping it lumpy. Honestly, it’s not great.
The best bet in this whole outlook comes later, but it’s a long way off. On Friday the 24th, there’s a bigger ENE swell building – 7ft to 7ft, with a short period of 7 to 8 seconds (wind swell), and the energy is very strong (1143 to 1312). The wind is cross, so it’ll be lumpy, but there’s size. This swell sticks around through Saturday the 25th (8ft, 8 seconds, 1383 energy) and Sunday the 26th (7ft, 8 seconds, 1381 energy). This is the only period with real push, but it’s a short-period wind swell, so it’s not going to be the cleanest. The reef setup at Ammonias might handle it, but 8ft is getting big – that’s expert territory. Crowds are often here, so expect company.
After that, things fade again. The last week of July into August is a mess of small, onshore, and cross-onshore junk. There’s a mid-month window on the 21st and 22nd of July with that south groundswell, but it’s marginal. The real standout – if you can call it that – is the 24th to 26th of July for size, but the wind kills the quality. It’s a waiting game.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Sat afternoon, min 23°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 13mm), heaviest on Thu night. Warm (max 26°C on Tue afternoon, min 24°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Sat 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | ||||||||||||||
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 8 | ENE 8 | ENE 7 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | S 15 | S 14 | ENE 7 | SSW 24 | SSW 23 | SSW 22 | SSW 20 | SSW 20 | SSW 18 | ENE 8 | SSW 17 | ENE 8 |
Wave Graph | ||||||||||||||||||||
312 | 327 | 264 | 210 | 207 | 220 | 214 | 186 | 343 | 316 | 285 | 437 | 426 | 480 | 528 | 399 | 469 | 514 | 456 | 540 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 6:48PM0.51m | 8:26AM0.35m | 7:13PM0.43m | 9:50AM0.41m | 7:25PM0.35m | 11:06AM0.46m | 12:06PM0.52m | 12:55PM0.57m | 1:36PM0.61m | 00:21AM0.18m | ||||||||||
Low Tide | 1:46AM0.05m | 1:11PM0.23m | 2:18AM0.05m | 2:53PM0.29m | 2:52AM0.04m | 3:30AM0.04m | 4:16AM0.04m | 5:07AM0.04m | 10:06PM0.17m | |||||||||||
— | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | |
7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:21 | — | — | 7:21 | — | — | 7:21 | — | |
mm | — | — | — | — | — | — | — | — | — | — | 3 | — | — | 2 | 1 | 2 | 4 | 1 | — | 2 |
Temp °C | 27 | 25 | 25 | 26 | 24 | 26 | 26 | 24 | 26 | 26 | 25 | 25 | 25 | 24 | 25 | 26 | 24 | 25 | 26 | 24 |
Feels °C | 26 | 25 | 24 | 25 | 23 | 25 | 25 | 23 | 26 | 25 | 25 | 24 | 23 | 23 | 24 | 25 | 23 | 24 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SE 9 | S 12 | S 13 | SSW 11 | SSW 12 | S 16 | S 15 | S 15 | S 14 | S 13 | S 14 | SSW 23 | S 13 | SSW 20 | S 13 | SSW 18 | SSW 18 | SSW 17 | SSW 16 |
210 | 59 | 113 | 125 | 73 | 75 | 188 | 165 | 343 | 316 | 285 | 311 | 426 | 212 | 528 | 215 | 469 | 448 | 428 | 302 | |
Swell 2 Height (m) Direction Period (s) | SSE 8 | S 12 | SSE 8 | SSE 7 | S 18 | S 16 | SSW 10 | S 12 | SW 17 | SW 16 | SSW 26 | SSW 24 | S 13 | SSW 22 | S 13 | SSW 20 | S 13 | S 12 | S 12 | S 20 |
48 | 75 | 47 | 21 | 162 | 137 | 60 | 108 | 73 | 65 | 224 | 437 | 173 | 480 | 206 | 399 | 85 | 145 | 102 | 400 | |
Swell 3 Height (m) Direction Period (s) | WNW 13 | W 12 | W 12 | S 19 | SE 6 | SE 9 | S 13 | SSW 16 | SSW 11 | SE 6 | E 14 | E 12 | E 12 | E 12 | E 12 | E 12 | E 11 | ENE 10 | S 21 | S 12 |
56 | 26 | 25 | 113 | 10 | 20 | 29 | 104 | 24 | 8 | 32 | 73 | 103 | 108 | 141 | 137 | 61 | 36 | 326 | 100 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 8 | ENE 8 | ENE 7 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 7 | ENE 8 |
312 | 327 | 264 | 210 | 207 | 220 | 214 | 186 | 158 | 117 | 240 | 192 | 189 | 316 | 247 | 285 | 326 | 514 | 456 | 540 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 31 | 16 | 16 | 16 | 16 | 31 | 16 | 16 | 31 | 31 | 33 | 31 | 16 | 16 | 31 | 46 | 16 | 33 | 38 | 16 |
Best forecast wave conditions in Kaua'i | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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










