Surf Forecasts:
Ammonias surf forecast from 25 Jul 2026:
- Best quality surf: Wednesday 29 Jul, 2PM (local time) - 8ft (2.5m), 11s period, ENE swell with cross-offshore winds.
- Most powerful swell: Wednesday 29 Jul, 2AM (local time) - 8ft (2.5m), 13s period, ENE swell with 2,157 kJ wave energy.
- Next surfable swell (1★+): Wednesday 29 Jul, 2PM (local time) - 8ft (2.5m), 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 2PM. The primary swell is predicted to be 2.5m and 11s period with a secondary swell of 0.8m 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 2.5m 13s and forecast to arrive on Wednesday (Jul 29) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 9s period and expected on Thursday (Jul 30) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Wed 29th Jul) | 8ft (2.5m) 11s |
| Best Surf | 2PM (Wed 29th Jul) | 8ft (2.5m) 11s |
| Most Powerful | 2AM (Wed 29th Jul) | 8ft (2.5m) 13s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright, Rusty here, in imperial now.
So, Ammonias (reef) is a spot that likes a good SSE swell direction, and it’s fairly consistent, but for the next 16 days, we’re looking at a long, slow grind before anything really gets going. The opening days are a write-off. From Friday the 24th of July right through Wednesday morning the 29th of July, it’s average to poor. Winds are coming in cross, mostly from the ENE at 16 mph, and the water’s sitting at 80°, which is pretty average for this time of year. The combined swell energy is in the 1000s (1282 to 1082), so there’s some energy around, but it’s not hitting the spot right.
The only real standout, and I mean the only one worthy of getting excited about, is Wednesday the 29th of July. Late morning and into the afternoon, we see a 10ft ENE groundswell dropping to 8ft, with a period of 11 seconds, and a gentle NNE breeze of 9 mph. That’s a clean, cross-offshore wind, which makes a huge difference. The combined swell energy hits 2228, which is strong. That 10ft swell (8ft by afternoon) is into expert territory, but the reef should handle it. Just keep it in mind, that’s for experienced surfers only. The swell direction (ENE) lines up with the optimum (SSE) okay, but not perfectly—still, the power and clean conditions make this the one bright spot.
After that pulse, Thursday the 30th drops back, and from Friday the 31st of July through to Saturday the 8th of August, we hit a rough patch. Winds pick up to fresh onshore or cross-shore, periods drop to 7–8 seconds, and the energy numbers fall below 1000 (916 down to 458). A lot of that period is just choppy, nasty surf. There are a couple of days in the second week, like the 5th and 6th of August, with small 5ft-6ft swell and light wind, but it’s cross-onshore or onshore, so it’s messy. Nothing to get your hopes up about.
So, short story: Wednesday the 29th of July is your shot. Clean, powerful, and for the experienced crew only. The rest of the window is largely flat or junk.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Fri afternoon. Warm (max 25°C on Fri afternoon, min 23°C on Fri night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Wed afternoon, min 24°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Fri 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | ||||||||||||||
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) | SSW 17 | ENE 8 | SSW 19 | SSW 18 | SSW 18 | SSW 16 | SSW 16 | E 15 | E 14 | E 14 | E 14 | E 13 | E 13 | ENE 13 | ENE 11 | ENE 11 | S 14 | ENE 8 | ENE 8 | E 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 428 | 428 | 627 | 731 | 662 | 575 | 452 | 424 | 485 | 530 | 613 | 1127 | 1247 | 2157 | 1943 | 1432 | 293 | 353 | 350 | 343 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | cross-on | cross-on |
High Tide | 00:21AM0.18m | 2:14PM0.63m | 1:16AM0.20m | 2:48PM0.65m | 1:57AM0.21m | 3:20PM0.66m | 2:33AM0.23m | 3:50PM0.67m | 3:10AM0.25m | 4:18PM0.66m | 3:49AM0.27m | 4:44PM0.65m | 4:33AM0.29m | |||||||
Low Tide | 10:06PM0.17m | 6:00AM0.03m | 10:10PM0.16m | 6:48AM0.01m | 10:20PM0.16m | 7:31AM-0.01m | 10:33PM0.16m | 8:11AM-0.02m | 10:50PM0.15m | 8:48AM-0.01m | 11:10PM0.13m | 9:25AM0.00m | 11:32PM0.11m | |||||||
 |  | |  | |  | |  | | | | | | | | | | | | | |
 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — |
 | 7:21 | — | — | 7:20 | — | — | 7:20 | — | — | 7:19 | — | — | 7:19 | — | — | 7:17 | — | — | 7:17 | — |
mm | 1 | 2 | 2 | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 26 | 26 | 25 | 26 | 27 | 25 | 26 | 27 | 26 |
Feels °C | 23 | 23 | 24 | 23 | 23 | 24 | 23 | 23 | 24 | 24 | 23 | 27 | 27 | 25 | 27 | 28 | 27 | 28 | 30 | 28 |
Swell 1 Height (m) Direction Period (s) | SSW 17 | SSW 16 | SSW 19 | SSW 18 | SSW 18 | SSW 16 | SSW 16 | E 15 | E 14 | E 14 | E 14 | E 13 | E 13 | ENE 13 | ENE 11 | ENE 11 | NE 9 | ENE 8 | ENE 8 | S 13 |
| kJ | 428 | 302 | 627 | 731 | 662 | 575 | 452 | 424 | 485 | 530 | 613 | 1127 | 1247 | 2157 | 1943 | 1432 | 516 | 353 | 350 | 209 |
Swell 2 Height (m) Direction Period (s) | S 12 | S 20 | SSW 16 | S 11 | S 11 | E 15 | E 15 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | S 14 | S 14 | S 14 | S 13 | S 13 | SSW 16 |
| kJ | 138 | 408 | 196 | 61 | 37 | 107 | 290 | 416 | 288 | 284 | 213 | 189 | 141 | 137 | 268 | 261 | 293 | 225 | 219 | 175 |
Swell 3 Height (m) Direction Period (s) | S 21 | S 12 | S 12 | E 14 | E 13 | E 12 | S 11 | SSE 11 | S 10 | SE 11 | SE 11 | SE 11 | SE 10 | S 16 | SW 21 | SSW 19 | SW 19 | SW 18 | SW 18 | N 9 |
| kJ | 326 | 136 | 95 | 33 | 53 | 47 | 36 | 12 | 17 | 18 | 18 | 29 | 24 | 77 | 17 | 37 | 58 | 154 | 152 | 6 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | NE 7 | NNE 7 | NNE 9 | NNE 9 | — | — | — | SE 4 | — | E 7 |
| kJ | 390 | 428 | 483 | 519 | 522 | 452 | 382 | 319 | 279 | 250 | 261 | 123 | 211 | 59 | — | — | — | 16 | — | 343 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 33 | 16 | 31 | 31 | 16 | 16 | 16 | 16 | 31 | 31 | 14 | 16 | 16 | 14 | 10 | 0 | 0 | 16 | 31 | 33 |
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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