Surf Forecasts:
Ammonias surf forecast from 17 Jul 2026:
- Most powerful swell: Thursday 23 Jul, 8PM (local time) - 3.5ft (1.0m), 19s period, SSW swell with 708 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 19s and forecast to arrive on Thursday (Jul 23) at 8PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 14s period and expected on Friday (Jul 17) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Thu 23rd Jul) | 3.5ft (1.0m) 19s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Righto, let’s cut through the chatter. I’m Rusty, and I’ve had a look at Ammonias for the next 16 days. I’ll be straight with you – it’s a quiet stretch. The first few days are a write-off; from Friday 17 July right through to the end of the month, the conditions are pretty ordinary. The wind is mostly cross or cross-on from the ENE, and the swell is short-period, messy stuff. The energy is moderate at best, climbing to strong later in the run, but the quality just isn’t there for a proper paddle. You’ve got a consistent cross-chop, and the wave comment is consistently “poor surf conditions” for the first week and a half. It’s a reef setup, so it’s exposed, but with the wind all wrong and the swell direction not lining up with the optimum SSE, it’s a tough one. Water temperature is sitting at 80°, which is pretty average for this time of year – no anomaly to speak of.
The real glimmer, the only true standout, doesn’t show up until Saturday 1 August. That morning, the wind swings around to a light NNE at 9 mph, giving you a clean, cross-off breeze. The swell is small, only 2 ft, but it’s a long-period 15-second groundswell from the SW, which is a better direction for this reef. Energy is weak (141), but it’s clean. That’s the best on offer – a small, clean window. After that, the afternoon brings back the cross-shore ENE wind and a bumpy 4 ft short-period swell. So, for the whole 16 days, you’ve got a long gap of flat, poor conditions, then one promising morning. Don’t get your hopes up too much for the long-range stuff; it’s a marginal forecast at best. Crowds are often a thing here, so if you do go for that Saturday morning, expect company.
Rusty.
Short Range ForecastSome drizzle, heaviest during Sat morning. Warm (max 26°C on Fri morning, min 23°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Tue night. Warm (max 26°C on Mon afternoon, min 23°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||
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 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | S 15 | S 14 | S 13 | SSW 24 | SSW 23 | SSW 22 | SSW 20 | SSW 20 | SSW 18 |
Wave Graph  | |||||||||||||||||||||
 kJ | 180 | 196 | 198 | 239 | 319 | 327 | 246 | 226 | 250 | 191 | 188 | 172 | 275 | 316 | 347 | 437 | 426 | 480 | 528 | 399 | 469 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross-on | cross | cross | cross | cross | cross | cross-on | cross | cross | cross | cross | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on |
High Tide | 6:18PM0.59m | 7:07AM0.31m | 6:48PM0.51m | 8:26AM0.35m | 7:13PM0.43m | 9:50AM0.41m | 7:25PM0.35m | 11:06AM0.46m | 12:06PM0.52m | 12:55PM0.57m | |||||||||||
Low Tide | 11:11AM0.05m | 1:14AM0.06m | 12:04PM0.14m | 1:46AM0.05m | 1:11PM0.23m | 2:18AM0.05m | 2:53PM0.29m | 2:52AM0.04m | 3:30AM0.04m | 4:16AM0.04m | |||||||||||
 | |  |  | | | | |  | | | | | |  | | | |  | | | |
 | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — |
 | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:21 | — | — | 7:21 | — |
mm | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | 3 | 2 | — | 1 | — | — | 1 |
Temp °C | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 24 | 25 | 26 | 24 | 25 | 26 | 24 | 25 | 26 | 24 | 26 | 26 | 25 |
Feels °C | 26 | 26 | 25 | 26 | 25 | 25 | 24 | 25 | 22 | 24 | 26 | 24 | 24 | 25 | 24 | 25 | 26 | 23 | 26 | 24 | 24 |
Swell 1 Height (m) Direction Period (s) | W 14 | SSW 16 | SSW 13 | SSW 14 | SSW 14 | SE 8 | S 12 | S 13 | S 11 | S 12 | S 16 | S 15 | S 15 | S 14 | S 13 | S 13 | S 13 | S 13 | SSW 20 | SSW 20 | SSW 18 |
| kJ | 140 | 196 | 187 | 204 | 210 | 34 | 113 | 125 | 65 | 67 | 188 | 163 | 275 | 316 | 347 | 277 | 280 | 212 | 528 | 399 | 469 |
Swell 2 Height (m) Direction Period (s) | SSW 12 | W 14 | W 13 | WNW 13 | SE 9 | S 12 | SSE 9 | SE 8 | S 18 | S 16 | SSW 10 | S 12 | SSW 11 | SW 16 | SSW 26 | SSW 24 | SSW 23 | SSW 22 | S 13 | S 13 | S 11 |
| kJ | 56 | 134 | 87 | 56 | 36 | 75 | 50 | 35 | 162 | 137 | 62 | 112 | 48 | 65 | 224 | 437 | 426 | 480 | 209 | 163 | 81 |
Swell 3 Height (m) Direction Period (s) | SSW 16 | SSW 12 | SE 7 | SSW 8 | WNW 13 | W 12 | W 12 | S 19 | SE 7 | SW 18 | SE 6 | SW 16 | SW 17 | SE 6 | E 11 | E 12 | E 12 | E 11 | E 12 | E 12 | S 13 |
| kJ | 100 | 82 | 25 | 11 | 56 | 26 | 25 | 113 | 12 | 82 | 9 | 69 | 73 | 7 | 22 | 68 | 66 | 88 | 108 | 103 | 123 |
Wind waves Height (m) Direction Period (s) | ENE 7 | 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 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 |
| kJ | 180 | 192 | 198 | 239 | 319 | 327 | 246 | 226 | 250 | 191 | 173 | 172 | 136 | 153 | 171 | 181 | 161 | 107 | 134 | 145 | 188 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 16 | 16 | 33 | 31 | 16 | 31 | 16 | 16 | 31 | 31 | 16 | 31 | 31 | 16 | 31 | 31 | 38 | 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
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