
Surf Forecasts:
Ammonias surf forecast from 20 Jul 2026:
- Most powerful swell: Sunday 26 Jul, 11AM (local time) - 4.5ft (1.4m), 16s period, E swell with 1,034 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 1.4m 16s and forecast to arrive on Sunday (Jul 26) at 11AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 8s period and expected on Sunday (Jul 26) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Sun 26th Jul) | 4.5ft (1.4m) 16s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's on the menu for Ammonias over the next couple of weeks.
Straight up, I'm not gonna lie to you – this forecast is a bit of a mixed bag. It's not a write-off, but you're gonna have to be patient and pick your moments. The water temp is sitting at a warm 80°, which is pretty much bang on average for this time of year, so no surprises there.
The first few days are a bit of a struggle. Monday the 20th and Tuesday the 21st have some small, short-period windswell coming in from the ENE, around 3 ft to 5 ft, but it's all cross-shore wind and the wave comment says it's marginal. The combined energy is moderate (516 to 612), but it's not going to be pretty. We're looking at a bit of a slow start.
Then we hit a real rough patch from Wednesday the 22nd through to Friday the 24th. The swell gets a bit bigger, with some long-period groundswell from the SSW pushing 2 ft to 3 ft, but the wind is cross-on and the energy jumps up (1068 to 1148), which just means a lot of messy, choppy water. The comments are all "poor surf conditions". This is a classic case of the swell and wind not playing nice together. Honestly, for a beach-and-reef setup like this, you'd be better off looking at a kite on those days.
Things start to look a bit more promising around the weekend of the 25th and 26th of July. We get a pulse of ENE windswell, pushing 7 ft to 7 ft, but it's lumpy and cross-shore with a fresh breeze. The energy is strong (1351 to 1365), but the quality is still rated as marginal. However, by Sunday the 26th, the swell shifts to the east with a much longer period of 16 seconds, and the wind drops to a moderate breeze. The energy is very strong (1645 to 1822). This is a proper groundswell, and while it might be a bit testing for beginners at over 5 ft, for the experienced crew, this could be the standout window. The long period will mean better shaped waves, but watch out – it might wall up and break a bit straight on the beach. The reef points should handle it beautifully.
The first week of August brings a few more pulses, but the wind stays onshore or cross-shore and the quality is poor to marginal. There's a window on Monday the 3rd of August with ENE swell at 7 ft and energy over 1000, but the cross-onshore wind on Tuesday the 4th spoils the party.
The Bottom Line: If you're desperate for a paddle, the Sunday the 26th of July looks like the best bet. That east swell with long period and moderate cross-shore wind is the real standout. The Saturday the 25th also has size, but it's lumpy. For the rest of the run, it's a case of watching the wind and hoping for a clean-up. The best waves are likely to be on the reef points rather than the beach.
Stay salty.
Rusty.
Short Range ForecastHeavy rain (total 20mm), heaviest during Tue night. Warm (max 26°C on Mon morning, min 24°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 10mm), heaviest on Thu afternoon. Warm (max 25°C on Thu morning, min 23°C on Thu night). Mainly fresh winds. | ||||||||||||||||||||
Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | |||||||||||||||
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) | ENE 7 | ENE 7 | ENE 7 | S 15 | S 14 | S 13 | SSW 24 | SSW 23 | SSW 22 | SSW 20 | SSW 20 | SSW 18 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | SSW 18 | E 17 | E 16 | E 16 | E 15 |
Wave Graph | |||||||||||||||||||||
193 | 207 | 197 | 275 | 320 | 352 | 437 | 564 | 480 | 528 | 399 | 469 | 444 | 495 | 495 | 574 | 731 | 702 | 1034 | 972 | 911 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross-on | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross-on | cross | cross | cross | cross | cross | cross |
High Tide | 9:50AM0.41m | 7:25PM0.35m | 11:06AM0.46m | 12:06PM0.52m | 12:55PM0.57m | 1:36PM0.61m | 00:21AM0.18m | 2:14PM0.63m | 1:16AM0.20m | 2:48PM0.65m | 1:57AM0.21m | ||||||||||
Low Tide | 2:53PM0.29m | 2:52AM0.04m | 3:30AM0.04m | 4:16AM0.04m | 5:07AM0.04m | 10:06PM0.17m | 6:00AM0.03m | 10:10PM0.16m | 6:48AM0.01m | 10:20PM0.16m | |||||||||||
6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — | |
— | 7:22 | — | — | 7:22 | — | — | 7:21 | — | — | 7:21 | — | — | 7:21 | — | — | 7:20 | — | — | 7:20 | — | |
mm | 1 | — | 3 | 2 | 2 | 7 | 4 | — | 1 | — | 1 | 1 | 2 | 1 | 2 | — | 1 | 2 | — | — | — |
Temp °C | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 26 | 24 |
Feels °C | 25 | 24 | 24 | 26 | 26 | 25 | 24 | 24 | 23 | 24 | 23 | 23 | 23 | 23 | 22 | 24 | 23 | 23 | 24 | 25 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 12 | S 16 | S 12 | S 15 | S 14 | S 13 | S 14 | S 13 | S 13 | SSW 20 | SSW 20 | SSW 18 | SSW 18 | SSW 17 | SSW 16 | SSW 19 | SSW 18 | E 17 | E 16 | E 16 | E 15 |
104 | 188 | 110 | 275 | 320 | 352 | 311 | 280 | 212 | 528 | 399 | 469 | 356 | 428 | 302 | 502 | 731 | 702 | 1034 | 972 | 911 | |
Swell 2 Height (m) Direction Period (s) | S 16 | SSW 11 | S 15 | SSW 11 | SW 16 | SSW 26 | SSW 24 | SSW 23 | SSW 22 | S 13 | S 13 | S 13 | S 12 | S 12 | S 20 | SSW 16 | E 14 | SSW 18 | SSW 16 | SSW 16 | S 16 |
137 | 64 | 163 | 70 | 65 | 224 | 437 | 564 | 480 | 209 | 219 | 85 | 145 | 102 | 408 | 223 | 148 | 662 | 575 | 452 | 509 | |
Swell 3 Height (m) Direction Period (s) | SW 18 | SW 18 | SW 16 | SW 17 | E 15 | SW 15 | E 12 | E 12 | E 12 | E 12 | E 12 | S 11 | S 22 | S 21 | S 12 | S 12 | S 11 | S 11 | S 11 | S 10 | SSE 11 |
82 | 80 | 69 | 72 | 38 | 60 | 73 | 103 | 103 | 103 | 96 | 56 | 86 | 326 | 100 | 66 | 61 | 37 | 36 | 33 | 12 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NE 8 | ENE 8 | ENE 8 |
193 | 207 | 197 | 180 | 189 | 214 | 247 | 181 | 226 | 308 | 278 | 420 | 444 | 495 | 495 | 574 | 488 | 488 | 408 | 365 | 327 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 16 | 16 | 31 | 31 | 33 | 38 | 33 | 16 | 31 | 31 | 16 | 31 | 33 | 38 | 16 | 31 | 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










