
Surf Forecasts:
Ammonias surf forecast from 19 Jul 2026:
- Most powerful swell: Saturday 25 Jul, 5PM (local time) - 3.5ft (1.0m), 18s period, SSW swell with 724 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 1.0m 18s and forecast to arrive on Saturday (Jul 25) at 5PM. 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 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5PM (Sat 25th Jul) | 3.5ft (1.0m) 18s |
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 cards for Ammonias over the next couple of weeks.
Overall, it's a pretty grim stretch for decent waves. The wind is locked in from the east-northeast almost every day, which is cross-shore here, and with a reef break like this, you really want something offshore to keep it from getting messy. The swell is all over the place, but the quality just isn't there. We're looking at a long run of poor conditions, with a few days that are barely marginal.
The first real chance to even think about paddling out is around Monday, July 21st. The swell drops right down to about 3 ft, but it shifts to the south with a very long period of 15 seconds. That's a proper groundswell, and the energy is moderate (611). The problem is the wind is still cross-shore, and the forecast is calling it marginal. The break is a reef, so a long period south swell like that can wrap in nicely, but without clean wind it's going to be a frustrating session.
The next sniff of anything better comes on Wednesday, July 23rd. The swell is tiny, only about 2 ft, but the period is a massive 24 seconds from the south-southwest. The combined energy jumps up to a strong 1013 early in the morning. That's a lot of power for a tiny wave, meaning it'll be very straight and walled up, but for a reef like Ammonias, it could offer a few long, clean lines if you can find the right spot. The wind is still cross-shore, so it's not a standout, but it's the most interesting day of the whole run.
The final week of July and into August is a write-off. The wind picks up, the swell gets sloppy, and the energy starts to fade. There's a bit of east-northeast swell mid-week, but it's short period, junky, and cross-shore. The water temperature sits around 80°, which is pretty average for this time of year, so no surprises there.
Honestly, for the whole 16 days, there are no real standouts. The best you can hope for is a marginal session on the morning of Wednesday the 23rd, and even that's a gamble. The rest of the time, with the consistent cross-shore breeze and lumpy conditions, the setup at Ammonias reef looks more interesting for a kite surfer than a paddle surfer.
Rusty, signing off.
Short Range ForecastLight rain (total 5mm), mostly falling on Tue afternoon. Warm (max 26°C on Sun morning, min 24°C on Sun morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Wed night. Warm (max 26°C on Wed afternoon, min 23°C on Fri night). Mainly fresh winds. | ||||||||||||||||||||
Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | |||||||||||||||
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 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | S 15 | S 14 | ENE 7 | SSW 24 | SSW 23 | SSW 22 | SSW 20 | SSW 20 | SSW 18 | SSW 18 | ENE 7 | ENE 8 | ENE 8 | SSW 18 | SSW 18 |
Wave Graph | |||||||||||||||||||||
264 | 237 | 214 | 208 | 220 | 206 | 343 | 320 | 285 | 437 | 426 | 480 | 528 | 399 | 469 | 376 | 444 | 572 | 502 | 724 | 662 | |
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-on | cross | cross | cross | cross-on | cross | cross-on | cross | cross | cross | cross | cross | cross |
High Tide | 8:26AM0.35m | 7:13PM0.43m | 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 | ||||||||||
Low Tide | 1:11PM0.23m | 2:18AM0.05m | 2:53PM0.29m | 2:52AM0.04m | 3:30AM0.04m | 4:16AM0.04m | 5:07AM0.04m | 10:06PM0.17m | 6:00AM0.03m | 10:10PM0.16m | |||||||||||
6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | |
— | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:21 | — | — | 7:21 | — | — | 7:21 | — | — | 7:20 | — | |
mm | — | — | — | — | — | — | — | 2 | 3 | — | — | 1 | 2 | — | 2 | 1 | — | 3 | 1 | — | — |
Temp °C | 26 | 26 | 25 | 25 | 26 | 24 | 26 | 26 | 25 | 25 | 26 | 24 | 25 | 25 | 24 | 25 | 26 | 24 | 25 | 25 | 24 |
Feels °C | 25 | 24 | 24 | 24 | 25 | 24 | 26 | 25 | 25 | 24 | 25 | 23 | 23 | 23 | 23 | 24 | 25 | 22 | 24 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | S 12 | S 13 | SSW 11 | SSW 12 | S 16 | S 15 | 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 | SSW 18 |
113 | 125 | 73 | 75 | 188 | 165 | 343 | 320 | 285 | 311 | 280 | 212 | 528 | 399 | 469 | 356 | 340 | 302 | 502 | 724 | 662 | |
Swell 2 Height (m) Direction Period (s) | SSE 8 | SE 7 | S 18 | S 16 | SSW 10 | S 12 | SW 17 | SW 16 | SSW 26 | SSW 24 | SSW 23 | SSW 22 | S 13 | S 13 | SSE 8 | S 12 | S 12 | S 20 | SSW 16 | S 11 | E 16 |
45 | 22 | 162 | 137 | 60 | 108 | 73 | 65 | 224 | 437 | 426 | 480 | 160 | 163 | 40 | 145 | 102 | 408 | 198 | 87 | 252 | |
Swell 3 Height (m) Direction Period (s) | W 12 | S 19 | SE 6 | SW 18 | S 13 | SSW 16 | SSW 11 | E 15 | E 14 | E 12 | E 12 | E 12 | SW 16 | E 12 | S 13 | SE 7 | S 21 | S 12 | S 12 | E 18 | S 9 |
25 | 113 | 10 | 82 | 29 | 105 | 24 | 38 | 32 | 73 | 103 | 104 | 65 | 98 | 85 | 27 | 329 | 97 | 95 | 96 | 61 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
264 | 237 | 214 | 208 | 220 | 206 | 171 | 195 | 247 | 192 | 189 | 240 | 427 | 293 | 423 | 376 | 444 | 572 | 494 | 483 | 545 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 33 | 16 | 31 | 16 | 16 | 31 | 31 | 38 | 31 | 31 | 16 | 33 | 33 | 38 | 31 | 31 | 16 | 31 | 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










