
Surf Forecasts:
Ammonias surf forecast from 15 Jul 2026:
- Most powerful swell: Wednesday 22 Jul, 8AM (local time) - 3.5ft (1.0m), 14s period, S swell with 394 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 Wednesday (Jul 22) at 8AM. 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 8s period and expected on Wednesday (Jul 15) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Wed 22nd Jul) | 3.5ft (1.0m) 14s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
G'day, Rusty here, and I've got the scoop on the stretch ahead for one spot. Honestly, it's been a bit of a dry spell, and the story doesn't change much for a while. Ammonias is a reef setup, fairly consistent but it's been getting hammered by cross and cross-onshore winds, so the waves have been a choppy mess. The water temp is sitting at 80°, which is pretty much bang on average for this time of year – nothing wild there.
The first couple of weeks are a real write-off. We're looking at a solid 10-day gap here where the surf is just plain poor, with scores of zero across the board. From Wednesday the 15th right through to almost the end of next week, the wind is mostly out of the east to east-northeast at 9 to 12 mph, all cross-on or cross-shore. The swell is small, mostly under 3 ft, and the energy is weak to moderate, with the combined energy reading between 70 and 938. It's just not worth paddling out for.
The first sign of life comes on Sunday the 19th of July. The afternoon shows a little spike with 5 ft swells from the east-northeast, but the period is a short 8 seconds, so it's not going to have any grunt. The energy is up to 528, but with 12 mph cross-shore winds, it's only a marginal call. The same goes for the following week – from Monday the 21st through to Sunday the 27th, the swell stays around 2 ft to 4 ft, but the period gets long, from 14 to 20 seconds, which is a groundswell. This is a double-edged sword. The energy is strong, hitting 657 to 1627, and the waves should have shape, but the cross-shore wind is still a problem, keeping things messy. The best of the bunch looks like Saturday the 25th afternoon and Sunday the 26th morning, with 2 ft to 3 ft swells from the south-southwest, very long period around 18 seconds, and lighter winds. The energy is massive, 1136 and 1627, but with the wind angle, it's still marginal. Crowds are often a thing here, so keep that in mind.
Then we get a bit of a shift. Moving into the following week, Monday the 28th and Tuesday the 29th, the swell size jumps to 6 ft to 7 ft, still from the east-northeast with a short 8-second period. The wind is howling out of the northeast at 12 to 19 mph, cross-shore, so it's fresh and lumpy. The energy is moderate, between 645 and 898. This is getting into the zone where it's more interesting for a kite surfer than a paddle surfer, to be honest. The waves will be there but the quality won't be for a traditional surf.
The 16-day window does have a couple of promising moments, but they are a long way off. The standout is the morning of Saturday the 26th of July. It's a Sunday by the time that rolls around, but it's the best mix of swell size, that very long period groundswell giving it shape, and the lightest wind we've seen. The combined energy is a massive 1627, so there's plenty of power, but the cross-shore wind on a reef like Ammonias will keep it from being a classic. It's promising, but not certain.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Thu 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 3mm), 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 7 | ENE 7 | ENE 7 | SSW 14 | SSW 14 | E 7 | E 8 | ENE 8 | ENE 8 | ENE 8 | S 16 | ENE 7 | S 15 | S 14 | S 13 |
Wave Graph | |||||||||||||||||||||
162 | 70 | 314 | 237 | 195 | 181 | 175 | 196 | 187 | 207 | 210 | 226 | 279 | 231 | 212 | 142 | 190 | 197 | 279 | 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-on | cross-on | cross | cross | cross-on | 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 | — | — | — | — | — | 1 | — | — | 1 | — | — | 1 | — | — | — | — | — | 2 | — | — | — |
Temp °C | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 24 | 25 | 25 | 24 | 25 | 26 | 24 |
Feels °C | 27 | 27 | 26 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 27 | 25 | 26 | 26 | 23 | 25 | 24 | 24 | 24 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | NE 7 | ENE 7 | NE 8 | W 14 | W 14 | SSW 14 | W 14 | SSW 16 | SSW 13 | SSW 14 | SSW 14 | SE 8 | S 12 | S 13 | SSW 11 | S 16 | S 16 | S 15 | S 15 | S 14 | S 13 |
121 | 70 | 128 | 203 | 203 | 180 | 140 | 196 | 187 | 207 | 210 | 43 | 113 | 125 | 70 | 137 | 190 | 165 | 279 | 316 | 352 | |
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 | WNW 13 | SSE 9 | S 12 | SE 9 | SE 9 | S 18 | S 12 | SSW 10 | S 12 | E 14 | E 13 | E 12 |
287 | 279 | 314 | 237 | 113 | 146 | 100 | 134 | 87 | 56 | 30 | 75 | 38 | 59 | 162 | 69 | 36 | 108 | 65 | 85 | 73 | |
Swell 3 Height (m) Direction Period (s) | SW 13 | NNE 8 | W 15 | SSW 13 | SSW 17 | SSE 8 | SSW 12 | SSW 12 | SSE 7 | SSE 8 | WNW 13 | NNE 8 | NNE 7 | S 19 | SE 6 | SE 7 | SE 7 | SSW 16 | SW 11 | SW 16 | SSW 26 |
162 | 50 | 272 | 113 | 195 | 22 | 56 | 56 | 19 | 22 | 56 | 24 | 20 | 113 | 10 | 11 | 12 | 105 | 31 | 65 | 224 | |
Wind waves Height (m) Direction Period (s) | — | — | — | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | E 7 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
— | — | — | 131 | 123 | 181 | 175 | 180 | 158 | 154 | 165 | 226 | 279 | 231 | 212 | 142 | 134 | 197 | 200 | 191 | 187 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 14 | 14 | 15 | 31 | 31 | 33 | 31 | 31 | 16 | 31 | 31 | 33 | 31 | 31 | 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










