
Surf Forecasts:
Ammonias surf forecast from 29 Jul 2026:
- Best quality surf: Wednesday 29 Jul, 8AM (local time) - 6ft (1.9m), 11s period, ENE swell with cross-offshore winds.
- Most powerful swell: Tuesday 28 Jul, 8PM (local time) - 6.5ft (2.0m), 13s period, E swell with 1,339 kJ wave energy.
- Next surfable swell (1★+): Wednesday 29 Jul, 8AM (local time) - 6ft (1.9m), 11s period with ENE swell.
Best Forecast Surf Conditions for Ammonias this week:
The surf forecast for Ammonias over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Jul 29) at 8AM. The primary swell is predicted to be 1.9m and 11s period with a secondary swell of 0.7m and 14s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Ammonias in the next 16 days are 2.0m 13s and forecast to arrive on Tuesday (Jul 28) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 9s period and expected on Wednesday (Jul 29) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Wed 29th Jul) | 6ft (1.9m) 11s |
| Best Surf | 8AM (Wed 29th Jul) | 6ft (1.9m) 11s |
| Most Powerful | 8PM (Tue 28th Jul) | 6.5ft (2.0m) 13s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
G'day, Rusty here, and I've gotta be straight with you – the outlook for Ammonias over the next couple of weeks is a bit of a mixed bag, but there are a few windows where it could get fun. It's a reef setup, so expect a bit of a crowd, and it's fairly consistent.
Right now, the water is sitting at 80°, which is pretty much normal for the time of year, so no need to worry about a wetsuit.
We kick things off on Tuesday, the 28th of July. The morning has some clouds, wind is coming from the NNE at 12 mph, so it's a cross-off breeze. Swell is 6 ft from the East with a 13-second period, which is a nice long groundswell, and the combined energy is a solid 1461. The afternoon sees the swell push to 7 ft, period staying at 13 seconds, and energy hitting 1556, but the wind picks up to 16 mph. Still, it's a cross-off, so the surf should be clean. This is for experienced surfers – 6 ft to 7 ft is a decent size, and with that long period, the reef is going to be working well, but it’s a bit big for beginners.
Wednesday, the 29th of July, is looking like the standout. Morning is clear, with a gentle NNE breeze at 9 mph, cross-off. Swell is 7 ft from the ENE, period 11 seconds, and the energy is 1135. It's a touch smaller period than Tuesday, but still a solid groundswell. The afternoon gets even better – wind drops to 6 mph, light breeze, still cross-off. Swell inches up to 7 ft from the ENE, period 10 seconds, energy 1099. This is the best on offer: clean conditions, solid chest-to-head high waves, and the reef will be handling it well. Excellent for experienced surfers.
Thursday, the 30th of July, things change. Morning wind swings SE at 9 mph, onshore, and the swell drops to 5 ft with a short 8-second period, energy down to 725. The afternoon gets worse: wind from the East at 12 mph, cross-onshore, with 5 ft waves and the same short period. It's a write-off.
From Friday, the 31st of July, through to the end of the first week and into the second week, it's a long stretch of poor to marginal conditions. The wind is either cross-onshore or cross-shore from the ENE or NE, gusting between 12 and 22 mph, with swell sizes bouncing between 5 ft and 8 ft, but periods are mostly short, between 6 and 8 seconds, and the energy is moderate. The combination of onshore wind and short-period swell is going to make it choppy and messy. This is more of a kite-surfing setup than a paddle-surfing one.
There's a gap of about a week of questionable surf, but then we get a flicker of hope on Sunday, the 9th of August. The swell direction swings to the SSW, with a 3 ft swell and a very long 18-second period, energy 925. The wind is still cross-onshore from the ENE at 16 mph, though, so it's choppy. The long period means the reef will be holding the swell, but the wind is a killer. Monday, the 10th of August, is similar: 4 ft from the SSW, 16-second period, energy 1029, but wind is still cross-onshore from the East at 9 mph. The sets will be clean between the chop, but it's not a must-surf.
The best window is definitely Wednesday, the 29th of July. The light, cross-off winds and solid 7 ft ENE swell are going to make for a clean, powerful session on the reef. Get out there while it's good.
Rusty.
Short Range ForecastSome drizzle, heaviest during Wed night. Warm (max 27°C on Thu afternoon, min 24°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Sat night. Warm (max 26°C on Fri afternoon, min 23°C on Sun night). Mainly fresh winds. | |||||||||||||||||||
Tue 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | ||||||||||||||
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) | E 13 | E 12 | ENE 11 | ENE 10 | S 14 | S 13 | ENE 8 | E 7 | ENE 7 | ENE 7 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 |
Wave Graph | ||||||||||||||||||||
1247 | 1155 | 783 | 663 | 236 | 284 | 300 | 255 | 327 | 405 | 601 | 773 | 792 | 847 | 928 | 727 | 631 | 490 | 320 | 311 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross | cross-off | on | on | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 3:50PM0.67m | 3:10AM0.25m | 4:18PM0.66m | 3:49AM0.27m | 4:44PM0.65m | 4:33AM0.29m | 5:08PM0.61m | 5:22AM0.32m | 5:32PM0.57m | 6:19AM0.34m | 5:54PM0.51m | 7:26AM0.38m | 6:14PM0.44m | |||||||
Low Tide | 10:50PM0.15m | 8:48AM-0.01m | 11:10PM0.13m | 9:25AM0.00m | 11:32PM0.11m | 10:03AM0.04m | 11:56PM0.09m | 10:44AM0.09m | 00:22AM0.07m | 11:33AM0.16m | 00:50AM0.05m | 12:35PM0.23m | 1:21AM0.04m | |||||||
— | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | |
7:19 | — | — | 7:17 | — | — | 7:17 | — | — | 7:16 | — | — | 7:16 | — | — | 7:15 | — | — | 7:15 | — | |
mm | — | — | — | — | 1 | — | — | — | — | — | — | — | — | 3 | — | — | — | — | — | — |
Temp °C | 26 | 25 | 26 | 26 | 25 | 26 | 27 | 25 | 26 | 26 | 25 | 25 | 26 | 24 | 25 | 25 | 24 | 26 | 26 | 25 |
Feels °C | 26 | 26 | 28 | 28 | 28 | 28 | 29 | 26 | 26 | 25 | 24 | 22 | 24 | 22 | 23 | 22 | 23 | 25 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | E 13 | E 12 | ENE 11 | ENE 10 | NE 9 | ENE 8 | S 13 | S 13 | S 12 | SW 15 | SW 15 | E 15 | E 14 | E 14 | E 14 | E 14 | E 14 | E 13 | E 14 | E 13 |
1247 | 1155 | 783 | 663 | 481 | 157 | 219 | 206 | 146 | 232 | 220 | 205 | 146 | 199 | 206 | 203 | 200 | 176 | 184 | 276 | |
Swell 2 Height (m) Direction Period (s) | S 13 | SSW 13 | S 14 | S 14 | S 14 | S 13 | SW 18 | SSW 16 | SSW 16 | S 12 | E 15 | SSW 14 | SSW 14 | SSW 14 | SW 14 | SSW 13 | SW 13 | SSW 13 | N 6 | SE 9 |
130 | 137 | 268 | 264 | 236 | 284 | 152 | 175 | 169 | 141 | 159 | 123 | 123 | 131 | 92 | 68 | 42 | 34 | 18 | 41 | |
Swell 3 Height (m) Direction Period (s) | S 16 | S 16 | SSE 10 | SSW 19 | SW 19 | NNE 7 | E 19 | E 17 | E 16 | E 15 | S 12 | S 11 | S 11 | S 11 | S 11 | SE 9 | SE 8 | SE 7 | SE 6 | SSW 12 |
46 | 77 | 9 | 37 | 58 | 52 | 27 | 86 | 174 | 167 | 70 | 39 | 38 | 21 | 21 | 20 | 16 | 14 | 10 | 48 | |
Wind waves Height (m) Direction Period (s) | NE 9 | NNE 6 | NNE 8 | NNE 7 | — | — | ENE 8 | E 7 | ENE 7 | ENE 7 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 |
287 | 93 | 98 | 84 | — | — | 300 | 255 | 327 | 405 | 601 | 773 | 792 | 847 | 928 | 727 | 631 | 490 | 320 | 311 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 16 | 14 | 10 | 0 | 10 | 32 | 12 | 16 | 38 | 122 | 299 | 320 | 299 | 38 | 31 | 31 | 16 | 16 | 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










