
Surf Forecasts:
Ammonias surf forecast from 26 Jul 2026:
- Best quality surf: Wednesday 29 Jul, 2PM (local time) - 10ft (3.0m), 12s period, ENE swell with cross-offshore winds.
- Most powerful swell: Wednesday 29 Jul, 2PM (local time) - 10ft (3.0m), 12s period, ENE swell with 2,201 kJ wave energy.
- Next surfable swell (1★+): Wednesday 29 Jul, 2PM (local time) - 10ft (3.0m), 12s period with ENE swell.
Best Forecast Surf Conditions for Ammonias this week:
The surf forecast for Ammonias over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Jul 29) at 2PM. The primary swell is predicted to be 3.0m and 12s period with a secondary swell of 0.8m and 14s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Ammonias in the next 16 days are 3.0m 12s and forecast to arrive on Wednesday (Jul 29) at 2PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 9s period and expected on Thursday (Jul 30) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Wed 29th Jul) | 10ft (3.0m) 12s |
| Best Surf | 2PM (Wed 29th Jul) | 10ft (3.0m) 12s |
| Most Powerful | 2PM (Wed 29th Jul) | 10ft (3.0m) 12s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what we've got on the cards for Ammonias.
There's a bit of a slow start, but we’re looking at some solid building swell through the coming week. The standouts are definitely shaping up for the last couple of days of July, especially Wednesday the 29th. That’s where the real quality is.
For the Saturday afternoon of the 25th, we’ve got some waist-high swell at 3 ft coming from the SSW. The water temp is sitting at 80°, which is bang on average for this time of year. The energy is moderate (1415), but the wind is a cross-shore at 19 mph, so it’s going to be a bit lumpy and messy. It's a marginal session.
Sunday the 26th stays similar, with 3 ft and 3 ft SSW swell, but still stuck with that cross-shore breeze. The surf is not really cleaning up, and the energy is still moderate (1181). It’s a bit of a wait-and-see situation.
Monday the 27th sees the swell shifting to the east at 4 ft, but the wind is still cross-shore. The energy is dropping (1057 and 738), so it’s not really firing.
Now, Tuesday the 28th is where things start to get interesting. The morning shows a jump in size to 8 ft from the ENE, with moderate-to-strong energy (2138). The wind is still cross-shore, so it’s a bit lumpy. But the afternoon cleans up nicely with a cross-offshore breeze. The swell drops to 7 ft, but the energy is still strong (1567). This is a decent session for the experienced crew.
The standout is Wednesday, the 29th. The morning brings a clean 8 ft from the ENE with a 12-second period, and a gentle offshore breeze from the north at 9 mph. The energy is strong (2360). Then the afternoon is the real gem: 10 ft of ENE groundswell, with a 21-second period, and a near-calm north-northeast breeze at just 3 mph. The energy is still very strong (2342). This will be a powerful, long-period swell – perfect for the reef setup here, but it’s a big one. Over 8 ft, so this is for experts only. The water will be clean as a whistle.
After that, the quality drops off. Thursday the 30th is a step down with onshore wind and a shorter period, and by Friday the 31st we’re into poor surf conditions with a risk of thunderstorms and choppy cross-onshore wind. The swell sticks around at 6 ft to 8 ft through the first week of August, but the wind is mostly cross-shore and the period is short, which means messy, weak waves. The energy reads moderate (1023 to 1082) but it’s not well-formed. The setups would be more interesting for kite surfing than a clean paddle session.
The second week is a bit of a write-off for quality. From the 3rd of August onwards, the swell drops and the wind is often cross-on or onshore, with poor surf conditions flagged. The energy is weak to moderate (304 to 830), and the period is short. It’s a long stretch of marginal to poor days, so get your fix in on the 29th if you can.
Rusty out.
Short Range ForecastLight rain (total 4mm), mostly falling on Sat night. Warm (max 26°C on Mon afternoon, min 23°C on Sat night). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 8mm), mostly falling on Wed night. Warm (max 27°C on Thu afternoon, min 24°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Sat 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | ||||||||||||||
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) | SSW 18 | SSW 18 | SSW 16 | ENE 8 | E 15 | E 14 | E 14 | E 13 | ENE 13 | E 13 | E 13 | ENE 12 | ENE 11 | ENE 10 | ENE 9 | ENE 8 | ENE 8 | E 7 | ENE 8 | E 7 |
Wave Graph | ||||||||||||||||||||
731 | 790 | 575 | 452 | 424 | 478 | 445 | 499 | 1929 | 1380 | 1783 | 2071 | 2041 | 611 | 423 | 322 | 287 | 348 | 416 | 491 | |
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-off | cross-off | cross-off | cross-off | cross-on | on | cross | cross-on | cross-on | cross | cross |
High Tide | 2:14PM0.63m | 1:16AM0.20m | 2:48PM0.65m | 1:57AM0.21m | 3:20PM0.66m | 2:33AM0.23m | 3:50PM0.67m | 3:10AM0.25m | 4:18PM0.66m | 3:49AM0.27m | 4:44PM0.65m | 4:33AM0.29m | 5:08PM0.61m | |||||||
Low Tide | 10:10PM0.16m | 6:48AM0.01m | 10:20PM0.16m | 7:31AM-0.01m | 10:33PM0.16m | 8:11AM-0.02m | 10:50PM0.15m | 8:48AM-0.01m | 11:10PM0.13m | 9:25AM0.00m | 11:32PM0.11m | 10:03AM0.04m | 11:56PM0.09m | |||||||
— | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | |
7:20 | — | — | 7:20 | — | — | 7:19 | — | — | 7:19 | — | — | 7:17 | — | — | 7:17 | — | — | 7:16 | — | |
mm | — | 3 | 1 | — | — | — | — | — | — | — | — | — | — | 4 | 1 | — | 1 | 2 | — | 1 |
Temp °C | 25 | 24 | 24 | 25 | 24 | 25 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 26 | 26 | 27 | 25 | 26 | 26 | 25 |
Feels °C | 23 | 22 | 23 | 23 | 23 | 24 | 25 | 25 | 26 | 26 | 26 | 28 | 28 | 31 | 28 | 28 | 25 | 25 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | SSW 18 | SSW 18 | SSW 16 | SSW 16 | E 15 | E 14 | E 14 | E 13 | SSW 14 | E 13 | E 13 | ENE 12 | ENE 11 | ENE 10 | ENE 9 | S 13 | S 13 | S 12 | S 12 | SSW 15 |
731 | 790 | 575 | 452 | 424 | 478 | 445 | 499 | 189 | 1380 | 1783 | 2071 | 2041 | 611 | 423 | 219 | 206 | 146 | 104 | 144 | |
Swell 2 Height (m) Direction Period (s) | S 11 | E 13 | E 15 | E 15 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SE 9 | SSW 13 | SSW 13 | SSW 14 | S 14 | NNE 7 | S 13 | SW 18 | SSW 16 | SSW 16 | SW 15 | E 15 |
61 | 53 | 107 | 290 | 416 | 292 | 284 | 213 | 12 | 141 | 137 | 280 | 264 | 117 | 284 | 152 | 175 | 169 | 183 | 150 | |
Swell 3 Height (m) Direction Period (s) | E 14 | E 16 | E 12 | S 11 | SSE 11 | S 10 | S 11 | SE 11 | S 10 | S 16 | S 16 | SSE 10 | SSW 19 | S 14 | SW 18 | N 9 | SE 6 | E 15 | E 15 | S 12 |
33 | 45 | 47 | 20 | 12 | 8 | 9 | 18 | 8 | 46 | 77 | 9 | 37 | 236 | 154 | 6 | 18 | 116 | 155 | 70 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 13 | NNE 6 | NNE 7 | NNE 6 | — | — | — | ENE 8 | ENE 8 | E 7 | ENE 8 | E 7 |
590 | 575 | 452 | 419 | 344 | 279 | 289 | 274 | 1929 | 119 | 142 | 121 | — | — | — | 322 | 287 | 348 | 416 | 491 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 38 | 16 | 31 | 31 | 16 | 16 | 31 | 14 | 16 | 16 | 14 | 10 | 0 | 11 | 33 | 31 | 16 | 118 | 122 | 46 |
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










