
Surf Forecasts:
Ammonias surf forecast from 15 Jul 2026:
- Most powerful swell: Tuesday 21 Jul, 8PM (local time) - 3.5ft (1.0m), 14s period, S swell with 357 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 14s and forecast to arrive on Tuesday (Jul 21) 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 1.2m 8s period and expected on Wednesday (Jul 15) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Tue 21st Jul) | 3.5ft (1.0m) 14s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get into it.
Straight up, we’re looking at a pretty bleak stretch for Ammonias. This is a reef break that needs a clean southerly swell and offshore nor’westers to really fire, but what we’ve got on the cards is a whole lot of cross-onshore, choppy, and messy conditions. It’s going to be a long wait for anything decent.
For the first week and a half, from Wednesday the 15th right through to around Monday the 28th, the surf is mostly poor. The wind is almost always blowing from the east or east-northeast, which is cross-on here, and that’s just ruining the surface. The combined energy is often moderate, with figures like 162 (weak) or 342 (moderate), but with the wind chopping it up, it doesn’t matter much. The swell is mostly small, around 2ft to 5ft, but the periods are all over the place – short junk on the 17th (6 seconds) and some longer groundswell on the 16th (16-17 seconds) that just gets wrecked by the wind.
There’s a glimmer on Sunday the 19th afternoon. The swell bumps up to 5ft from the east-northeast, but the period is a short 8 seconds. The combined energy hits 547 (moderate), and the wind is just cross-shore. It’s still only a marginal call, not clean, but it’s the best of a bad bunch. The water temp is about average for the time of year.
The real standout, if you can call it that, is the very end of the run. On Saturday the 25th, we've got a chunk of energy in the water. The swell is 3-4ft from the south and south-southwest, with a long period of 18-19 seconds, and the combined energy is strong (1172 and 1154). That’s proper groundswell. The wind is still cross-shore from the northeast, so it won’t be glassy, but it’s the best we’ve got. Keep in mind, with that long period, it might break a bit straight at the beach, but at a reef like Ammonias, it could shape up alright. It’s still only a marginal rating, but this is the one to watch. Crowds are often a problem here, so expect company.
For the rest, it’s a flat, choppy, or messy run. There’s a gap of almost no surf from the 15th to the 18th, then a few marginal days before another poor stretch. The 25th is the only one that sparks any real interest, and it’s still a long way out, so treat it as promising but not locked in.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Wed night. Warm (max 26°C on Wed morning, min 24°C on Wed morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 5mm), mostly falling on Sat night. Warm (max 26°C on Sat morning, min 23°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | |||||||||||||||
AM | 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) | SW 13 | ENE 7 | SSW 16 | SSW 16 | SSW 17 | SSW 14 | ENE 6 | ENE 7 | ENE 7 | SSW 14 | SSW 14 | E 7 | E 8 | ENE 8 | ENE 8 | ENE 8 | S 16 | S 15 | S 15 | S 14 | S 13 |
Wave Graph | |||||||||||||||||||||
162 | 86 | 314 | 237 | 195 | 183 | 170 | 196 | 158 | 204 | 210 | 171 | 279 | 226 | 201 | 158 | 188 | 165 | 339 | 311 | 347 | |
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-on | cross-on | cross | cross | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 5:08PM0.73m | 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 | 9:34AM-0.07m | 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 | ||||||||
6:01 | — | — | 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 | 1 | — | — | — | — | 1 | — | 1 | 5 |
Temp °C | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 24 | 25 | 26 | 24 | 25 | 25 | 24 |
Feels °C | 27 | 27 | 26 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 26 | 24 | 25 | 23 | 24 | 25 | 23 | 24 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | NE 7 | ENE 7 | ENE 7 | W 14 | W 14 | SSW 14 | W 14 | SSW 16 | SSW 13 | SSW 14 | SSW 14 | NNE 8 | S 12 | S 13 | S 11 | S 16 | S 16 | E 7 | S 15 | S 14 | S 13 |
140 | 86 | 70 | 203 | 203 | 183 | 140 | 196 | 141 | 204 | 210 | 33 | 113 | 123 | 65 | 137 | 188 | 88 | 339 | 311 | 347 | |
Swell 2 Height (m) Direction Period (s) | W 15 | W 15 | SSW 16 | SSW 16 | SSW 13 | W 14 | SSW 16 | W 14 | W 13 | NNE 7 | SE 8 | SE 8 | NNE 8 | SE 9 | S 18 | S 12 | S 13 | S 15 | E 14 | E 13 | E 12 |
287 | 279 | 314 | 237 | 113 | 146 | 100 | 134 | 87 | 19 | 32 | 32 | 22 | 39 | 162 | 69 | 51 | 165 | 57 | 84 | 72 | |
Swell 3 Height (m) Direction Period (s) | SW 13 | NNE 8 | W 15 | SSW 13 | SSW 17 | SSE 7 | SSW 12 | SSW 12 | SE 7 | WNW 13 | WNW 13 | S 12 | SE 8 | SSE 19 | NNE 8 | SE 9 | SE 8 | S 13 | SW 17 | SW 16 | SE 6 |
162 | 50 | 272 | 113 | 195 | 21 | 56 | 55 | 25 | 56 | 56 | 73 | 23 | 120 | 24 | 19 | 17 | 87 | 73 | 65 | 10 | |
Wind waves Height (m) Direction Period (s) | — | — | — | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | E 7 | E 8 | ENE 8 | ENE 8 | ENE 8 | NE 7 | NE 7 | ENE 7 | ENE 7 | ENE 7 |
— | — | — | 131 | 138 | 170 | 170 | 180 | 158 | 121 | 155 | 171 | 279 | 226 | 201 | 158 | 160 | 53 | 163 | 170 | 191 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 15 | 14 | 31 | 31 | 16 | 31 | 31 | 16 | 31 | 31 | 31 | 31 | 16 | 16 | 31 | 16 | 16 | 16 | 31 | 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










