
Surf Forecasts:
Ammonias surf forecast from 18 Jul 2026:
- Most powerful swell: Thursday 23 Jul, 8PM (local time) - 3ft (0.9m), 19s period, SSW swell with 657 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 0.9m 19s and forecast to arrive on Thursday (Jul 23) at 8PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 13s period and expected on Saturday (Jul 18) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Thu 23rd Jul) | 3ft (0.9m) 19s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright, let’s get into it. This is Rusty.
Honestly, looking at the next 16 days at Ammonias, it’s a pretty grim outlook. There’s a real dry spell here, with no solid surf on offer for the first several days. The forecast is mostly a washout for any half-decent paddle surfing through the end of the month, with a lot of cross and cross-onshore winds making a mess of things. We’re looking at a run of marginal to poor conditions for a while.
The first standout doesn’t really show up until around Saturday, July 25th. Even then, it’s only a marginal call. The morning has a 0.9m swell from the SSW with a long period of 20 seconds, and cross-shore wind which keeps it slightly cleaner, but it’s still a bit of a challenging setup. Wave energy is strong, reading 1404, but that long-period groundswell tends to wrap a bit too straight for a beach setup – it'd be best at a point or reef, but we’re working with what we’ve got here. The rating on it is *extremely* limited.
The next real window of possibility creeps in around Sunday, July 26th through Monday, July 27th. The Sunday afternoon shows a 1.1m swell from the E with a period of 17 seconds, and the energy is strong at 1740. It’s still cross-shore, but the energy is there and the direction is swinging around a bit. The best of the whole period looks to be the Monday afternoon session on the 27th: a 1.3m swell from the East with a solid 15-second period. Even with the cross-shore wind, the wave state is cleaner and more manageable than the earlier choppy garbage. That’s your best bet – the wave energy is moderate-to-strong at 1077, and for this spot, that window gives you the best chance at a few lined-up waves.
The very end of the forecast, around the 1st and 2nd of August, tries to build again with some 1.6m to 1.8m swell, but the period is short (6 to 7 seconds) and the wind is back to cross-on or onshore, so it’s going to be a blown-out, bumpy mess. Not worth getting excited for at this range.
So, for Ammonias, you’re looking at a long, quiet wait until the 27th. The Monday the 27th is the only real highlight on the cards, and even then it’s a marginal one for the more experienced crew. Crowds are often here, so with the lack of options, expect a few heads out if the wind behaves.
Rusty.
Short Range ForecastSome drizzle, heaviest during Fri night. Warm (max 26°C on Sat morning, min 23°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Tue night. Warm (max 26°C on Wed afternoon, min 23°C on Mon night). Wind will be generally light. | ||||||||||||||||||
Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | ||||||||||||||
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 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | S 18 | ENE 8 | S 16 | ENE 7 | S 15 | S 14 | S 14 | SSW 24 | SSW 23 | SSW 22 | SSW 20 | SSW 20 | SSW 18 |
Wave Graph | |||||||||||||||||||
198 | 268 | 321 | 318 | 270 | 246 | 162 | 191 | 188 | 177 | 275 | 316 | 316 | 437 | 426 | 480 | 528 | 399 | 469 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross | cross | cross |
High Tide | 7:07AM0.31m | 6:48PM0.51m | 8:26AM0.35m | 7:13PM0.43m | 9:50AM0.41m | 7:25PM0.35m | 11:06AM0.46m | 12:06PM0.52m | 12:55PM0.57m | ||||||||||
Low Tide | 1:14AM0.06m | 12:04PM0.14m | 1:46AM0.05m | 1:11PM0.23m | 2:18AM0.05m | 2:53PM0.29m | 2:52AM0.04m | 3:30AM0.04m | 4:16AM0.04m | ||||||||||
— | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | |
7:22 | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:21 | — | — | 7:21 | — | |
mm | 1 | — | — | — | — | — | — | — | — | — | — | — | 2 | 2 | 2 | — | — | — | 1 |
Temp °C | 25 | 26 | 26 | 24 | 25 | 26 | 24 | 25 | 26 | 24 | 25 | 25 | 24 | 25 | 26 | 24 | 25 | 26 | 24 |
Feels °C | 25 | 26 | 25 | 23 | 24 | 25 | 23 | 24 | 26 | 24 | 25 | 24 | 24 | 24 | 25 | 23 | 24 | 25 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | SSW 14 | SSW 14 | SE 9 | S 12 | S 13 | E 8 | SSW 12 | S 16 | S 13 | S 15 | S 14 | S 14 | S 14 | SSW 23 | S 13 | SSW 20 | SSW 20 | SSW 18 |
187 | 204 | 210 | 61 | 113 | 125 | 58 | 75 | 188 | 121 | 275 | 316 | 316 | 315 | 426 | 212 | 528 | 399 | 469 | |
Swell 2 Height (m) Direction Period (s) | W 13 | WNW 13 | SE 8 | SSW 12 | SSE 9 | S 19 | SSW 11 | S 16 | SSW 10 | S 15 | SW 11 | SW 16 | SSW 26 | SSW 24 | S 13 | SSW 22 | S 13 | S 13 | S 13 |
87 | 56 | 35 | 47 | 49 | 113 | 73 | 137 | 62 | 165 | 31 | 65 | 224 | 437 | 176 | 480 | 209 | 160 | 85 | |
Swell 3 Height (m) Direction Period (s) | SE 7 | SSW 7 | WNW 13 | W 12 | W 12 | SE 7 | S 18 | SE 7 | SE 6 | SSW 16 | SW 17 | SSE 6 | SW 15 | E 12 | S 10 | E 11 | E 12 | SSW 16 | SE 7 |
25 | 5 | 56 | 26 | 25 | 12 | 162 | 11 | 9 | 105 | 73 | 4 | 60 | 72 | 78 | 87 | 106 | 175 | 25 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 6 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 7 |
198 | 268 | 321 | 318 | 270 | 246 | 111 | 191 | 169 | 177 | 136 | 153 | 149 | 189 | 220 | 160 | 139 | 252 | 276 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 16 | 31 | 31 | 16 | 31 | 16 | 16 | 31 | 16 | 16 | 31 | 31 | 16 | 33 | 38 | 16 | 31 | 31 | 16 |
Best forecast wave conditions in Kaua'i | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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










