
Surf Forecasts:
Ammonias surf forecast from 22 Jul 2026:
- Most powerful swell: Tuesday 28 Jul, 2AM (local time) - 5ft (1.6m), 14s period, E swell with 974 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 1.6m 14s and forecast to arrive on Tuesday (Jul 28) at 2AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 8s period and expected on Tuesday (Jul 28) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Tue 28th Jul) | 5ft (1.6m) 14s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright, Rusty here again, this time in feet and miles. Let’s talk Ammonias. It’s a reef setup, so you know it needs the right direction to fire. Right now, the stars just aren’t aligned. The wind is all wrong, and the swell is mostly small and messy. Water temp’s about 80°, which is pretty average for this time of year, nothing wild.
We’re staring down a long dry spell. From Wednesday the 22nd of July all the way through the end of the month, you can leave your board at home. Swell is mostly under 3 feet, wind is cross or cross-on from the east-northeast at 12 to 18 mph. The energy numbers are decent—like 1058 to 1274—but that’s background rumble, not rideable quality. The period is super long, over 20 seconds, which is classic groundswell, but on a reef with that wind, it’s just a crumbly, choppy mess. Conditions are called poor or marginal every time, with cross-chop and lumpy surfaces. Nothing to get excited about.
Thursday the 24th of July, we get a spike to around 6 to 7 feet, but it’s from the east-northeast with a period of just 7 seconds. That’s short-period junk. The energy is high, 1064 and 1173, but it’s sloppy. The wind is still cross. Marginal at best.
Things pick up from Monday the 27th of July into early August. Swell climbs from 4 feet to just over 8 feet by Wednesday the 5th of August. The period improves to 12-13 seconds, and the energy gets huge, like 2258 on the morning of the 5th. That’s serious power. But the wind stays cross or cross-on from the east-northeast, and even when it’s light, it’s onshore or side-shore, keeping the surface choppy. The direction is east or east-northeast, not the south-southeast the reef really wants. So it never properly cleans up.
Thursday the 6th of August sees the wind finally go light and onshore from the southeast, with the swell at a solid 8 feet from the east-northeast at 12 seconds. Energy is 1747 and then 2139. That’s a lot of water moving. But on a reef, with onshore wind, even light, it’s going to be bumpy and tricky. It’s the best of a bad bunch, but it’s a long way off—less certain, but promising in size. Only experts need apply, because 8 feet on a reef is serious.
So the standout, if there is one, is the morning of Wednesday the 5th of August. 8 feet of swell, 13-second period, energy 2258. The wind is light cross-on, so you might get some workable waves if you don’t mind a bit of texture. That afternoon and Thursday the 6th are also in the mix, but it’s still not clean.
First week is a total bust. From the 22nd to the end of July, don’t bother. Early August has the size and power, but the wind just won’t get out of the way. If you’re a local expert who can handle some chop, the 5th and 6th of August are your only real options. For everyone else, wait for the next system.
Rusty.
Short Range ForecastModerate rain (total 14mm), heaviest on Wed morning. Warm (max 26°C on Fri afternoon, min 23°C on Wed night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Sat morning. Warm (max 26°C on Sat afternoon, min 23°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | |||||||||||||||
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) | SSW 24 | SSW 23 | SSW 22 | SSW 20 | SSW 20 | SSW 18 | ENE 7 | SSW 17 | ENE 7 | ENE 8 | SSW 18 | SSW 18 | SSW 16 | SSW 16 | E 15 | E 14 | E 14 | E 14 | E 13 | E 13 | E 13 |
Wave Graph | |||||||||||||||||||||
437 | 564 | 480 | 528 | 399 | 469 | 432 | 366 | 468 | 502 | 731 | 790 | 575 | 452 | 513 | 594 | 585 | 974 | 784 | 771 | 848 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross-on | cross | cross | cross |
High Tide | 12:06PM0.52m | 12:55PM0.57m | 1:36PM0.61m | 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 | |||||||||
Low Tide | 4:16AM0.04m | 5:07AM0.04m | 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 | ||||||||||
6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | |
— | 7:21 | — | — | 7:21 | — | — | 7:21 | — | — | 7:20 | — | — | 7:20 | — | — | 7:19 | — | — | 7:19 | — | |
mm | 5 | 3 | — | 1 | — | 2 | 1 | — | 2 | 1 | — | 3 | — | — | 2 | — | — | — | — | — | — |
Temp °C | 25 | 25 | 24 | 24 | 25 | 24 | 25 | 26 | 24 | 25 | 26 | 24 | 25 | 26 | 24 | 25 | 26 | 24 | 25 | 26 | 24 |
Feels °C | 25 | 24 | 23 | 23 | 23 | 23 | 24 | 25 | 23 | 24 | 25 | 23 | 24 | 25 | 23 | 24 | 25 | 24 | 24 | 26 | 24 |
Swell 1 Height (m) Direction Period (s) | S 14 | SSW 23 | S 13 | SSW 20 | S 13 | SSW 18 | SSW 18 | 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 | E 13 |
311 | 564 | 212 | 528 | 219 | 469 | 356 | 340 | 302 | 502 | 731 | 790 | 575 | 452 | 513 | 594 | 585 | 974 | 784 | 771 | 848 | |
Swell 2 Height (m) Direction Period (s) | SSW 24 | S 13 | SSW 22 | S 13 | SSW 20 | S 13 | S 12 | S 12 | S 20 | SSW 16 | S 11 | E 13 | E 15 | E 15 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 14 |
437 | 173 | 480 | 212 | 399 | 85 | 190 | 141 | 408 | 223 | 61 | 53 | 216 | 353 | 416 | 288 | 284 | 213 | 189 | 141 | 207 | |
Swell 3 Height (m) Direction Period (s) | E 12 | S 10 | E 12 | SSW 16 | E 12 | S 11 | S 22 | S 21 | S 12 | S 12 | E 14 | E 16 | E 12 | S 11 | SSE 11 | S 10 | SE 10 | SE 9 | SE 8 | SE 8 | SE 10 |
73 | 78 | 103 | 100 | 98 | 56 | 86 | 326 | 100 | 66 | 33 | 82 | 47 | 36 | 12 | 19 | 16 | 40 | 18 | 17 | 24 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | NE 8 | NE 7 | NE 9 | NNE 7 |
237 | 286 | 188 | 320 | 317 | 350 | 432 | 366 | 468 | 483 | 412 | 531 | 402 | 336 | 344 | 279 | 272 | 159 | 93 | 112 | 73 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 38 | 33 | 16 | 38 | 31 | 16 | 16 | 33 | 16 | 33 | 31 | 16 | 31 | 16 | 16 | 16 | 31 | 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










