
Surf Forecasts:
Ammonias surf forecast from 9 Aug 2026:
- Most powerful swell: Sunday 16 Aug, 8AM (local time) - 8ft (2.5m), 13s period, ENE swell with 2,233 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 2.5m 13s and forecast to arrive on Sunday (Aug 16) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 12s period and expected on Thursday (Aug 13) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Sun 16th Aug) | 8ft (2.5m) 13s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Right, let’s have a look at the next couple of weeks for Ammonias. It’s a reef setup, fairly consistent, but honestly, the forecast is a bit of a mixed bag to start. We’ve got a lot of cross-shore energy and onshore breezes messing things up for the first few days, so don’t get too keen. The water temp is sitting around 80°, which is about average for this time of year, so nothing weird there.
The first real window of decent surf looks like it arrives on the 16th of August. The swell jumps up to 8ft to 10ft from the ENE, with a solid period of 12-13 seconds. It’s a bit of a beast, so this is one for the experienced crew, not the learners. The wind is offshore, which is a big plus, and it should be clean. The energy is strong too, at 4174. That’s the standout of the week, but it’s still a bit raw.
The morning of the 17th, Monday, is the real gem though. The swell holds at 10ft from the ENE, but the wind swings light offshore from the NNW, and the energy is still pumping at 2218. This is the one to circle on the calendar. It’s going to be big, powerful, and clean. After that, it drops off quickly, back down to under 3ft, and the wind swings around, making things messy again.
The second week is a bit of a write-off to be honest. The swell tries to pick up again around the 22nd and 23rd, with some 5ft to 8ft ENE swell, but the wind is all over the place, cross-on and choppy. It’s not worth getting excited about. There are a few pulses of longer period SSW swell, but they’re small and the wind ruins the surface. The 23rd has a risk of thunderstorms, and the swell is short period, so it’s going to be a messy, lumpy mess.
Overall, the middle of the month is where it’s at. The 16th and 17th are your best shots for a proper wave. After that, it fades out. Keep your eyes on the charts, because the energy is there, but the wind is going to be the deciding factor.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Sun night. Warm (max 27°C on Sun afternoon, min 24°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Thu morning, min 24°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | |||||||||||||||
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 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | S 20 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | S 14 | S 14 | ENE 9 | ENE 11 | ENE 13 |
Wave Graph | |||||||||||||||||||||
233 | 210 | 263 | 259 | 234 | 231 | 222 | 269 | 373 | 515 | 741 | 1178 | 1004 | 906 | 743 | 598 | 489 | 476 | 579 | 1113 | 2190 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross | cross | cross | cross-on | cross | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 2:05PM0.73m | 1:24AM0.22m | 2:47PM0.75m | 2:17AM0.26m | 3:26PM0.74m | 3:06AM0.30m | 4:02PM0.71m | 3:54AM0.34m | 4:34PM0.66m | 4:44AM0.37m | 5:03PM0.59m | 5:36AM0.41m | 5:29PM0.52m | ||||||||
Low Tide | 9:35PM0.15m | 7:01AM-0.05m | 9:56PM0.13m | 7:54AM-0.06m | 10:20PM0.12m | 8:43AM-0.04m | 10:44PM0.10m | 9:30AM-0.00m | 11:09PM0.08m | 10:17AM0.05m | 11:35PM0.07m | 11:06AM0.12m | 00:00AM0.06m | ||||||||
6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — | |
— | 7:12 | — | — | 7:10 | — | — | 7:10 | — | — | 7:09 | — | — | 7:08 | — | — | 7:08 | — | — | 7:07 | — | |
mm | — | — | 1 | 2 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 27 | 25 | 26 | 26 | 25 | 27 | 27 | 25 | 26 | 26 | 25 | 27 | 27 | 25 | 26 | 26 | 25 | 27 | 27 | 25 |
Feels °C | 26 | 27 | 25 | 27 | 26 | 26 | 28 | 27 | 25 | 25 | 25 | 24 | 26 | 26 | 24 | 25 | 24 | 25 | 25 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | S 18 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 13 | SSW 13 | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | S 14 | S 14 | S 13 | S 13 | S 13 |
98 | 156 | 263 | 259 | 234 | 231 | 222 | 269 | 299 | 289 | 741 | 1178 | 1004 | 906 | 743 | 598 | 489 | 476 | 345 | 276 | 268 | |
Swell 2 Height (m) Direction Period (s) | SSW 16 | SSW 12 | SE 10 | SE 10 | SE 8 | SSE 9 | SSE 9 | SSE 9 | S 20 | S 18 | SSW 13 | W 12 | W 12 | SE 9 | W 12 | SE 12 | SE 12 | SE 13 | SE 11 | SE 12 | S 18 |
104 | 83 | 46 | 46 | 35 | 52 | 53 | 53 | 373 | 515 | 289 | 25 | 25 | 13 | 10 | 35 | 35 | 42 | 33 | 37 | 98 | |
Swell 3 Height (m) Direction Period (s) | SSW 18 | SSW 16 | SSW 12 | SSW 12 | SSW 12 | SSW 11 | S 11 | SSW 11 | SE 9 | SE 9 | WNW 12 | WNW 12 | SW 19 | W 12 | SSE 10 | W 12 | W 11 | W 11 | W 10 | W 10 | W 12 |
102 | 100 | 82 | 81 | 45 | 23 | 62 | 41 | 36 | 38 | 28 | 27 | 14 | 10 | 9 | 11 | 22 | 21 | 19 | 18 | 46 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 6 | ENE 6 | E 7 | E 6 | E 6 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 9 | ENE 11 | ENE 13 |
233 | 210 | 193 | 222 | 193 | 197 | 176 | 147 | 151 | 160 | 145 | 176 | 188 | 153 | 276 | 286 | 322 | 429 | 579 | 1113 | 2190 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 31 | 16 | 31 | 16 | 16 | 31 | 31 | 16 | 31 | 16 | 16 | 16 | 31 | 31 | 31 | 31 | 16 | 31 | 31 | 14 |
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











