
Surf Forecasts:
Ammonias surf forecast from 14 Jul 2026:
- Most powerful swell: Sunday 19 Jul, 11AM (local time) - 6ft (1.8m), 8s period, ENE swell with 385 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 1.8m 8s and forecast to arrive on Sunday (Jul 19) at 11AM. Winds are predicted to be cross-onshore 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 | 11AM (Sun 19th Jul) | 6ft (1.8m) 8s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Right, let’s have a look at what’s on offer for the next couple of weeks. It’s been a bit of a flat spell to kick things off, but hang tight – there’s some interesting stuff showing up later.
The first real chance of a wave isn’t until the 19th of July, so we’re looking at a solid gap of nearly a week with nothing worth paddling out for. Up until then, it’s all cross-shore or cross-onshore winds and poor surf conditions.
The only spot we’ve got on the radar is Ammonias, a reef break. It’s fairly consistent, but it’s an intermediate spot and it does get crowded often. The water’s sitting at 79°, which is pretty much bang on average for this time of year, so no surprises there.
Alright, let’s talk about the best of it. The standout window looks like the end of the run, from the 26th of July. On the morning of the 26th, we’ve got a 3ft swell from the SSW, with a period of 17 seconds, and the combined energy is up at 1049 – that’s moderate to strong energy. The wind is cross from the ENE at 12 mph, which is workable. By the afternoon, it builds to 3ft from the E, with a 16-second period and the energy jumps to 1210. The wind swings to the NE at 16 mph, still cross. That’s a solid, long-period groundswell, and for a reef like Ammonias, that’s going to offer some nice, lined-up waves. The sets will be well-spaced, so paddling out shouldn’t be a total mission.
Now, the 27th of July holds similar size – 4ft to 4ft from the E, with periods around 15 to 16 seconds, and energy well over 1100. The wind stays cross, so it’ll be a bit lumpy but still rideable. Then on the 28th, we get a 7ft swell from the ENE with a 14-second period and the energy goes through the roof at 2181. That’s a big, powerful swell. For the reef, it’s going to be heavy. That’s expert territory only – too much punch for anyone not well experienced. The 29th is similar, with 7ft and a 13-second period, and energy still huge at 1820.
So, overall, the best bet for the average surfer is the 26th and 27th of July. The swell direction from the E and SSE is a good match for what the reef likes, and the long period will give you proper waves. The 28th and 29th are for the brave only.
There’s a chance of a few marginal sessions between the 19th and 25th, but with the cross-shore winds and lower energy, it’s not going to be anything special. The forecast is a bit more reliable for the near-term, and while the end-of-the-month stuff looks promising, it’s a bit further out, so keep an eye on it.
If you’re a kiter, the choppy, cross-shore conditions on the beachier days might be more your thing, but for a paddle, hang out for that last week.
Rusty.
Short Range ForecastModerate rain (total 18mm), heaviest on Wed morning. Warm (max 26°C on Wed afternoon, min 23°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Fri morning. 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 | ENE 7 | SSW 18 | SSW 16 | SSW 16 | SSW 17 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | S 14 | ENE 6 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | S 16 | ENE 7 |
Wave Graph | |||||||||||||||||||||
189 | 186 | 200 | 183 | 216 | 314 | 237 | 195 | 198 | 180 | 196 | 172 | 216 | 198 | 176 | 385 | 316 | 277 | 177 | 190 | 176 | |
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 | 1 | 1 | 4 | 2 | 5 | — | — | 3 | 1 | — | — | — | — | — | 1 | 1 | — | — | 2 | 1 |
Temp °C | 25 | 25 | 24 | 25 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 24 | 25 | 25 | 24 | 25 | 25 | 24 |
Feels °C | 24 | 24 | 23 | 26 | 27 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 24 | 25 | 24 | 24 | 25 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 14 | W 15 | W 15 | W 15 | NE 7 | W 14 | W 14 | SSW 14 | W 14 | SSW 16 | SSW 13 | SSW 14 | S 14 | SSW 12 | S 12 | S 13 | S 11 | S 12 | S 12 | S 15 |
189 | 186 | 298 | 287 | 279 | 156 | 203 | 203 | 180 | 140 | 196 | 141 | 154 | 198 | 47 | 113 | 123 | 65 | 98 | 108 | 165 | |
Swell 2 Height (m) Direction Period (s) | W 16 | W 16 | SSW 13 | SW 13 | NNE 8 | SSW 16 | SSW 16 | SSW 13 | W 14 | SE 8 | W 14 | SE 7 | WNW 13 | SE 9 | W 12 | W 12 | SSE 19 | S 18 | S 16 | S 16 | S 11 |
257 | 251 | 109 | 162 | 50 | 314 | 237 | 113 | 198 | 28 | 134 | 27 | 56 | 36 | 26 | 25 | 120 | 162 | 137 | 190 | 61 | |
Swell 3 Height (m) Direction Period (s) | SSW 19 | SW 19 | SSW 17 | SSW 18 | SSW 18 | W 15 | SSW 13 | SSW 17 | SE 7 | SSW 16 | SSE 7 | W 13 | SE 8 | WNW 13 | S 14 | S 19 | W 12 | SE 7 | SE 8 | SE 8 | SW 16 |
146 | 93 | 200 | 123 | 216 | 272 | 113 | 195 | 26 | 100 | 21 | 87 | 21 | 56 | 36 | 66 | 25 | 14 | 24 | 16 | 69 | |
Wind waves Height (m) Direction Period (s) | NE 7 | NE 8 | NE 8 | ENE 7 | ENE 7 | — | ENE 7 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 7 | ENE 6 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 |
242 | 276 | 229 | 183 | 127 | — | 127 | 70 | 198 | 180 | 180 | 172 | 216 | 180 | 176 | 385 | 316 | 277 | 177 | 177 | 176 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 16 | 16 | 31 | 31 | 31 | 31 | 31 | 33 | 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 | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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










