Surf Forecasts:
Ammonias surf forecast from 8 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 11PM (local time) - 5.5ft (1.7m), 11s period, ENE swell with cross-offshore winds.
- Most powerful swell: Tuesday 8 Sep, 11AM (local time) - 11ft (3.5m), 9s period, SSW swell with 1,720 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 11PM (local time) - 5.5ft (1.7m), 11s period with ENE swell.
Best Forecast Surf Conditions for Ammonias this week:
The surf forecast for Ammonias over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 08) at 11PM. The primary swell is predicted to be 1.7m and 11s period with a secondary swell of 1.4m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Ammonias in the next 16 days are 3.5m 9s and forecast to arrive on Tuesday (Sep 08) 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 0.9m 7s period and expected on Tuesday (Sep 08) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Tue 8th Sep) | 5.5ft (1.7m) 11s |
| Best Surf | 11PM (Tue 8th Sep) | 5.5ft (1.7m) 11s |
| Most Powerful | 11AM (Tue 8th Sep) | 11ft (3.5m) 9s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about Ammonias. Water temp is about 80°, which is about average for the time of year.
Straight off, Tuesday morning (8th September) has a big 12ft beast from the SSW, but a fresh 22 mph cross-southwest wind and rain showers are making it lumpy and messy. The energy is serious (3003), but it’s too choppy to enjoy. That size is only for experienced guys.
The rest of the first week is a washout. Wednesday morning (9th September) drops to 3ft with a 14-second groundswell, but it’s cross-on and just marginal. Thursday through Sunday (10th-13th September) is all poor conditions and chopped-out surf.
There’s a long 12-day stretch with nothing worth mentioning. Swell sizes bounce between 1ft and 6ft, but the wind is almost always cross or cross-on from the ENE, and every wave comment is either “poor” or “marginal.”
Your best bet? You have to wait until Wednesday 16th September afternoon. A 3ft SSW swell with a very long 18-second period rolls in with light cross winds, giving the reef a bit of clean shape (609 energy). That’s the only real window. It's not a classic, but the long period will push some nice lines. It can get a bit straight for the reef, but it’s the cleanest we’ll see. Crowds will likely be there though.
Honestly, for most of this month, the conditions look better for a kite than a paddle. That Wednesday 16th is the one to keep an eye on.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Thu afternoon. Warm (max 27°C on Tue afternoon, min 24°C on Thu night). Winds decreasing (strong winds from the SSW on Tue morning, calm by Wed night). | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Fri night. Warm (max 26°C on Fri morning, min 24°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | |||||||||||||||
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 9 | ENE 11 | ENE 11 | SSW 14 | SSW 13 | SSW 13 | ENE 8 | ENE 7 | ENE 7 | SW 16 | SW 15 | ENE 11 | ENE 10 | ENE 10 | SSW 13 | ENE 9 | ENE 9 | SSW 14 | SW 14 | SW 22 | SW 21 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1720 | 731 | 560 | 336 | 253 | 178 | 397 | 314 | 247 | 198 | 229 | 436 | 209 | 135 | 98 | 84 | 82 | 79 | 49 | 227 | 224 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross-on | on | cross | cross-on | cross-on | cross | cross | cross | cross-on | cross-on | cross-on | cross | cross-on | cross | cross | cross | cross | cross |
High Tide | 2:20PM0.68m | 2:21AM0.36m | 2:54PM0.66m | 3:04AM0.41m | 3:24PM0.61m | 3:47AM0.47m | 3:51PM0.55m | 4:29AM0.51m | 4:16PM0.48m | 5:11AM0.54m | 4:38PM0.41m | 5:56AM0.55m | 4:55PM0.35m | ||||||||
Low Tide | 9:05PM0.11m | 7:55AM0.03m | 9:25PM0.09m | 8:43AM0.05m | 9:45PM0.07m | 9:31AM0.09m | 10:06PM0.05m | 10:19AM0.13m | 10:28PM0.04m | 11:10AM0.18m | 10:50PM0.04m | 12:08PM0.22m | 11:14PM0.05m | ||||||||
 | |  |  | | |  | |  | | |  | | | | | | | | | | |
 | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — |
 | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — |
mm | 2 | 1 | — | — | — | — | 1 | 3 | — | — | — | 2 | 1 | 1 | — | — | — | — | — | — | — |
Temp °C | 26 | 27 | 26 | 27 | 27 | 26 | 27 | 26 | 25 | 26 | 26 | 25 | 25 | 25 | 25 | 26 | 26 | 25 | 26 | 27 | 25 |
Feels °C | 24 | 27 | 28 | 30 | 29 | 30 | 29 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 27 | 27 | 26 | 26 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 9 | ENE 8 | SSW 13 | SSW 12 | SW 16 | SW 16 | SW 15 | SW 15 | NNE 8 | ENE 10 | NE 9 | NE 9 | NE 9 | E 6 | NE 8 | SW 22 | NE 8 |
| kJ | 814 | 693 | 560 | 264 | 165 | 103 | 173 | 172 | 211 | 198 | 229 | 223 | 45 | 135 | 79 | 91 | 91 | 46 | 100 | 227 | 54 |
Swell 2 Height (m) Direction Period (s) | SSW 15 | SSW 14 | S 8 | SSW 14 | SSW 13 | SSW 13 | E 12 | E 12 | SSW 12 | E 11 | E 11 | SE 8 | SW 16 | NE 9 | SSW 13 | ENE 9 | ENE 9 | NE 9 | SW 14 | SW 14 | SW 21 |
| kJ | 494 | 449 | 182 | 336 | 253 | 178 | 106 | 104 | 81 | 91 | 89 | 18 | 124 | 79 | 98 | 84 | 82 | 88 | 49 | 47 | 224 |
Swell 3 Height (m) Direction Period (s) | SW 20 | NW 9 | SSW 14 | S 8 | S 7 | E 13 | SSW 17 | SW 18 | E 12 | SSW 12 | SSW 12 | SSW 11 | SSW 13 | SSW 16 | SW 16 | SSW 15 | SW 14 | SSW 14 | SE 8 | SE 8 | SSW 13 |
| kJ | 15 | 64 | 431 | 74 | 54 | 119 | 186 | 154 | 99 | 79 | 45 | 23 | 70 | 99 | 64 | 84 | 54 | 79 | 15 | 15 | 67 |
Wind waves Height (m) Direction Period (s) | SSW 9 | SSW 8 | — | — | — | — | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 11 | ENE 10 | — | ENE 9 | SE 5 | — | — | E 6 | ENE 8 | ENE 5 |
| kJ | 1720 | 731 | — | — | — | — | 397 | 314 | 247 | 158 | 160 | 436 | 209 | — | 88 | 5 | — | — | 30 | 120 | 31 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 34 | 23 | 11 | 23 | 31 | 10 | 14 | 31 | 16 | 31 | 31 | 16 | 14 | 12 | 16 | 12 | 12 | 1 | 31 | 16 | 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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