Surf Forecasts:
Ammonias surf forecast from 15 Jul 2026:
- Most powerful swell: Tuesday 21 Jul, 2PM (local time) - 3.5ft (1.0m), 14s period, S swell with 412 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 2PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 8s period and expected on Tuesday (Jul 14) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Tue 21st Jul) | 3.5ft (1.0m) 14s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
G'day, Rusty here. Look, I'm gonna be straight with you – this 16-day window for Ammonias is a bit of a grind. We're looking at a long stretch of pretty average conditions. The first real standout doesn't come until the very end of the month, so we've got a lot of so-so days to sit through.
The first week and a half is mostly a write-off. From Tuesday, 14 July right through to Sunday, 19 July, the surf is poor. Small swell, mostly around 2 ft to 2 ft, and the wind is a persistent cross or cross-onshore from the ENE. The water's sitting at 79°F, which is about normal for this time of year. The wave energy is weak to moderate (335 to 423), and the comment is "poor surf conditions" every day. Not worth paddling out for.
On Sunday, 19 July afternoon, we get a sniff of something better. There's a jump in size to 5 ft, but it's still only a marginal surf forecast or questionable tide conditions. The wind is cross-shore from the ENE at 12 mph, and the energy is picking up to 528. It's still not clean, but it's the first sign of life.
Now, the real highlight of this whole outlook is the period from Monday, 27 July through Tuesday, 28 July. This is the best on offer. We've got a steady 4 ft swell from the East, with a solid 14–16 second period. That's a proper groundswell, which means better shaped waves and more energy. The combined energy is strong at 862–873, which is a big jump. The wind is cross-shore from the NE at 12 mph, keeping things reasonably clean. The waves will be a bit more powerful, and the longer gaps between sets will make paddling out easier. It's not a total classic, but it's the most promising window in this otherwise flat run.
The final days, 29 July, are a step back with a light cross-onshore breeze and a drop in energy to 409–414. The swell holds at 3 ft from the East, but the quality drops off again.
So, for the diehards, keep your eyes on the 27th and 28th of July. It's the only real standout. The rest of the period is a waiting game. Crowds are likely at Ammonias, as it says "often", but with the weak conditions, it might be quieter than usual.
Rusty.
Short Range ForecastModerate rain (total 19mm), heaviest on Wed night. Warm (max 26°C on Wed morning, min 23°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Sat night. Warm (max 26°C on Fri afternoon, min 23°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | |||||||||||||||
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 14 | SW 14 | SSW 17 | SW 13 | SSW 15 | SSW 16 | SSW 16 | SSW 13 | ENE 7 | ENE 6 | ENE 7 | SSW 13 | SSW 14 | SSW 14 | ENE 6 | E 7 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | S 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 189 | 186 | 197 | 162 | 146 | 314 | 237 | 113 | 204 | 129 | 196 | 192 | 204 | 210 | 155 | 290 | 283 | 212 | 195 | 190 | 163 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross | cross-on | cross | cross | cross | cross | cross |
High Tide | 4:29PM0.77m | 3:58AM0.23m | 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 | ||||||||
Low Tide | 8:46AM-0.10m | 11:38PM0.10m | 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 | |||||||
 | |  | | | | |  |  |  | |  | | | | | | | | | | |
 | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — |
 | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — |
mm | 2 | 2 | 1 | 2 | 2 | 7 | 3 | — | — | — | — | — | — | — | 1 | 2 | — | — | 1 | — | — |
Temp °C | 25 | 25 | 24 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 24 | 25 | 25 | 24 |
Feels °C | 24 | 24 | 24 | 27 | 27 | 26 | 26 | 27 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 24 | 26 | 23 | 24 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 14 | W 15 | NE 7 | W 15 | NE 7 | W 14 | W 14 | SSW 14 | W 14 | SSW 16 | SSW 13 | SSW 14 | SSW 14 | S 12 | S 13 | S 13 | S 11 | S 16 | S 16 | S 15 |
| kJ | 189 | 186 | 298 | 140 | 279 | 156 | 203 | 203 | 180 | 140 | 196 | 187 | 204 | 210 | 75 | 115 | 86 | 66 | 195 | 190 | 163 |
Swell 2 Height (m) Direction Period (s) | W 16 | W 16 | SSW 13 | W 15 | NNE 8 | SSW 16 | SSW 16 | NNE 7 | W 14 | NNE 8 | W 14 | W 13 | SE 9 | SE 9 | SE 8 | NNE 8 | SE 9 | S 18 | S 12 | S 13 | S 13 |
| kJ | 257 | 251 | 109 | 287 | 50 | 314 | 237 | 43 | 198 | 35 | 134 | 87 | 38 | 47 | 34 | 22 | 39 | 162 | 69 | 51 | 86 |
Swell 3 Height (m) Direction Period (s) | SSW 19 | SW 19 | SSW 17 | SW 13 | SSW 15 | W 15 | SSW 13 | SSW 13 | SE 7 | SE 7 | SSE 7 | SE 7 | WNW 13 | WNW 13 | NNE 8 | SE 8 | SSE 19 | SE 9 | SE 8 | SW 18 | SW 16 |
| kJ | 146 | 93 | 197 | 162 | 146 | 272 | 113 | 113 | 27 | 27 | 21 | 27 | 56 | 56 | 25 | 18 | 120 | 38 | 17 | 80 | 69 |
Wind waves Height (m) Direction Period (s) | NE 7 | NE 8 | NE 7 | — | ENE 7 | — | ENE 7 | ENE 6 | ENE 7 | ENE 6 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | ENE 6 | E 7 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
| kJ | 268 | 276 | 193 | — | 134 | — | 131 | 66 | 204 | 129 | 175 | 192 | 161 | 154 | 155 | 290 | 283 | 212 | 193 | 186 | 132 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 16 | 16 | 14 | 31 | 14 | 31 | 31 | 16 | 31 | 16 | 16 | 31 | 16 | 16 | 31 | 16 | 16 | 31 | 16 | 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
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