
Surf Forecasts:
Ammonias surf forecast from 16 Jul 2026:
- Most powerful swell: Wednesday 22 Jul, 11PM (local time) - 2.5ft (0.8m), 22s period, SSW swell with 628 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 0.8m 22s and forecast to arrive on Wednesday (Jul 22) at 11PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 7s period and expected on Thursday (Jul 16) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11PM (Wed 22nd Jul) | 2.5ft (0.8m) 22s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright, let’s talk in feet and miles per hour. It’s Rusty, and honestly, this forecast is a slow burn. The first week is pretty much a bust for anything worthwhile, but if you’ve got the patience, the second half starts to show some promise.
The first surf worth mentioning isn’t until Thursday morning, 25 July. That’s a 9-day gap from the start with nothing recommended. The energy is there, but the wind and conditions just aren’t cooperating.
Let’s look at *Ammonias* (reef break). The water temp is about average for the time of year, nothing special.
For the first recommendation, on Thursday morning, 25 July, we’ve got a mixed bag. The swell is small at 3ft from the SSW, but the period is a very long 19 seconds—that’s proper groundswell. Combine that with moderate cross-shore winds from the ENE at 15 mph, and it’s not clean, but the energy is building. The combined swell energy is strong (1396). Because that period is so long, this reef break will handle it better than a beach, so it’s worth a look. The crowds are likely here, so don’t expect to have it to yourself.
The real standout, the best on offer, is the morning of Monday, 27 July. We’ve got 4ft of swell from the east, with a long 16-second period, and the wind is cross-shore from the NE at 15 mph. The combined energy is very strong (1529). This is the most promising window. The swell size is solid for intermediates, and the direction is a decent match for the break. It’s not perfect glass, but it’s the cleanest we’ll see in this forecast.
Wednesday morning, 29 July, brings a bigger push—6ft from the ENE, period 12 seconds—but the wind is a gentle cross-onshore at 9 mph, and it’s fairly choppy. The energy is strong (1110). That’s a bit too big for beginners, and the chop will make it a challenge. The afternoon is similar at 7ft.
After that, from Thursday, 30 July, it drops right off. Small swell of 2ft, with a short period, and the wind is back onshore. The energy is weak (110). Forget it.
So, to sum it up: the first week is a dud. The second week has a couple of windows, but the standout is the morning of Monday, 27 July. Keep an eye on it, but remember, long-range forecasts are less certain. If you can, plan for that day.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Wed night. Warm (max 26°C on Thu morning, min 24°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Sat night. Warm (max 26°C on Sun afternoon, min 23°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | ||||||||||||||
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 16 | SSW 16 | SSW 17 | SSW 14 | ENE 7 | SSW 16 | ENE 7 | SSW 14 | SSW 14 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | S 15 | S 15 | S 14 | S 13 |
Wave Graph | |||||||||||||||||||
314 | 237 | 195 | 180 | 154 | 196 | 187 | 207 | 210 | 286 | 250 | 226 | 212 | 165 | 190 | 163 | 339 | 316 | 352 | |
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-on | cross | cross | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross-on |
High Tide | 4:55AM0.26m | 5:45PM0.67m | 5:57AM0.28m | 6:18PM0.59m | 7:07AM0.31m | 6:48PM0.51m | 8:26AM0.35m | 7:13PM0.43m | 9:50AM0.41m | 7:25PM0.35m | 11:06AM0.46m | ||||||||
Low Tide | 00:10AM0.09m | 10:22AM-0.02m | 00:42AM0.08m | 11:11AM0.05m | 1:14AM0.06m | 12:04PM0.14m | 1:46AM0.05m | 1:11PM0.23m | 2:18AM0.05m | 2:53PM0.29m | 2:52AM0.04m | 3:30AM0.04m | |||||||
— | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | |
7:22 | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | |
mm | 2 | — | — | 3 | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | 2 |
Temp °C | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 24 | 25 | 26 | 24 | 25 | 26 | 24 |
Feels °C | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 26 | 26 | 26 | 24 | 26 | 23 | 24 | 25 | 24 | 24 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | NNE 8 | W 14 | W 14 | SSW 14 | W 14 | SSW 16 | SSW 13 | SSW 14 | SSW 14 | SE 8 | S 12 | S 13 | S 11 | S 12 | S 12 | S 15 | S 15 | S 14 | S 13 |
74 | 203 | 203 | 180 | 140 | 196 | 187 | 207 | 210 | 44 | 113 | 123 | 65 | 69 | 113 | 163 | 339 | 316 | 352 | |
Swell 2 Height (m) Direction Period (s) | SSW 16 | SSW 16 | SSW 13 | W 14 | SSW 16 | W 14 | W 13 | WNW 13 | WNW 13 | S 12 | SE 9 | SE 9 | S 18 | S 16 | S 16 | SSW 13 | E 16 | E 14 | E 14 |
314 | 237 | 113 | 146 | 100 | 134 | 87 | 56 | 56 | 75 | 39 | 38 | 162 | 137 | 190 | 98 | 170 | 202 | 257 | |
Swell 3 Height (m) Direction Period (s) | W 15 | SSW 13 | SSW 17 | SSE 8 | SSW 12 | SSW 12 | SSE 7 | SE 8 | SE 8 | W 12 | W 12 | SSE 19 | SE 6 | SW 18 | SW 18 | E 17 | SW 17 | SW 16 | SSW 26 |
272 | 113 | 195 | 22 | 56 | 82 | 19 | 14 | 15 | 26 | 25 | 120 | 11 | 82 | 80 | 90 | 73 | 65 | 224 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | NE 7 | NE 7 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
57 | 116 | 106 | 165 | 154 | 150 | 158 | 149 | 197 | 286 | 250 | 226 | 212 | 165 | 173 | 131 | 173 | 151 | 189 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 12 | 31 | 31 | 33 | 31 | 16 | 16 | 31 | 31 | 33 | 31 | 31 | 16 | 31 | 16 | 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










