Surf Forecasts:
Ammonias surf forecast from 5 Sep 2026:
- Best quality surf: Monday 7 Sep, 8PM (local time) - 18ft (5.5m), 14s period, SSW swell with onshore winds.
- Most powerful swell: Monday 7 Sep, 8PM (local time) - 18ft (5.5m), 14s period, SSW swell with 12,483 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 8PM (local time) - 18ft (5.5m), 14s period with SSW 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 Monday (Sep 07) at 8PM. The primary swell is predicted to be 5.5m and 14s period with a secondary swell of 2.2m and 13s. Another secondary swell of 3.0m and 8s is also forecast. The wind is predicted to be onshore as the swell arrives.
The most powerful waves expected at Ammonias in the next 16 days are 5.5m 14s and forecast to arrive on Monday (Sep 07) at 8PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 10s period and expected on Tuesday (Sep 08) at 8AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Mon 7th Sep) | 18ft (5.5m) 14s |
| Best Surf | 8PM (Mon 7th Sep) | 18ft (5.5m) 14s |
| Most Powerful | 8PM (Mon 7th Sep) | 18ft (5.5m) 14s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a proper look at what’s coming our way over the next couple of weeks for Ammonias, a reef setup that needs a specific window.
The pattern starts slow and stays on the tricky side for a while. We’ve got a bit of a wait for anything worthwhile, with the first week largely being about onshore winds and messy conditions making it hard to get excited. The water temp is sitting at 81°F, which is about average for this time of year, so no surprises there.
The only time this spot looks like it might fire up is right at the very end of the forecast. Saturday, the 19th of September, stands out as the best bet, with moderate wave energy (1297) and a 7ft swell from the ENE. The period is short at 9 seconds, so it won’t be as clean or powerful as a groundswell, but the winds are light from the ESE, keeping things just cross-onshore with small ripples. It’s still a marginal call but it’s the most promising window we’ve got. Before that, the rest of the period is a write-off, with strong onshore winds, lumpy conditions, and a lot of poor surf reports. The Monday the 7th pulls in a big 13ft SSW swell but it’s hammered by a strong onshore breeze, making it a messy, dangerous mess – only for the die-hards or the kites, really.
So, the long and short of it: there’s a big gap of about ten days with no real recommendations, and the only one worth a proper mention is that Saturday the 19th. Keep an eye on it, but don’t hold your breath.
Rusty.
Short Range ForecastHeavy rain (total 24mm), heaviest during Sun night. Warm (max 26°C on Fri afternoon, min 23°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 25mm), heaviest during Mon night. Warm (max 28°C on Tue afternoon, min 25°C on Wed night). Winds decreasing (strong winds from the SE on Mon night, calm by Tue night). | |||||||||||||||||||
Fri 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | ||||||||||||||
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) | SSE 12 | S 11 | ENE 14 | ENE 13 | ENE 13 | ENE 13 | ENE 12 | SSW 14 | SSW 15 | SW 15 | SW 12 | ENE 12 | ENE 11 | ENE 10 | SSW 14 | SSW 13 | ENE 8 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 680 | 584 | 1700 | 1474 | 1616 | 1387 | 1127 | 1475 | 3649 | 7533 | 4450 | 1047 | 787 | 427 | 341 | 257 | 250 | 314 | 237 | 208 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross-on | cross | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross | cross | cross |
High Tide | 12:04PM0.65m | 11:37PM0.20m | 12:57PM0.68m | 00:45AM0.25m | 1:42PM0.69m | 1:36AM0.30m | 2:20PM0.68m | 2:21AM0.36m | 2:54PM0.66m | 3:04AM0.41m | 3:24PM0.61m | 3:47AM0.47m | ||||||||
Low Tide | 3:24AM0.06m | 8:23PM0.17m | 8:30PM0.15m | 6:02AM0.04m | 8:46PM0.13m | 7:02AM0.02m | 9:05PM0.11m | 7:55AM0.03m | 9:25PM0.09m | 8:43AM0.05m | 9:45PM0.07m | |||||||||
 |  |  | |  | | |  |  |  | | |  | | | | | | | | |
 | — | — | 6:20 | — | — | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — |
 | 6:51 | — | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — |
mm | 1 | — | — | — | 3 | 2 | — | 14 | 4 | 4 | 15 | 3 | — | — | — | 1 | 2 | — | — | 2 |
Temp °C | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 27 | 27 | 28 | 27 | 27 | 27 | 26 | 26 | 26 | 25 |
Feels °C | 24 | 23 | 25 | 25 | 25 | 26 | 25 | 25 | 24 | 25 | 23 | 28 | 29 | 30 | 30 | 29 | 28 | 26 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | SSE 12 | S 11 | S 12 | S 12 | S 12 | SSW 12 | SSW 12 | SSW 14 | SSW 15 | SW 15 | SW 12 | S 9 | ENE 11 | ENE 10 | ENE 9 | ENE 8 | SSW 13 | SSW 13 | SSW 12 | E 12 |
| kJ | 680 | 584 | 846 | 723 | 472 | 560 | 447 | 1475 | 3649 | 7533 | 4450 | 817 | 787 | 427 | 216 | 165 | 178 | 131 | 123 | 112 |
Swell 2 Height (m) Direction Period (s) | E 14 | E 14 | SSW 18 | SSW 18 | SSE 10 | SSW 16 | S 11 | SSW 18 | E 13 | E 13 | ENE 12 | ENE 12 | S 8 | SSW 8 | SSW 14 | SSW 13 | E 13 | E 12 | E 12 | SSW 16 |
| kJ | 289 | 485 | 121 | 121 | 63 | 175 | 286 | 442 | 848 | 736 | 1140 | 1047 | 339 | 202 | 341 | 257 | 163 | 106 | 104 | 175 |
Swell 3 Height (m) Direction Period (s) | WSW 13 | SSW 19 | NNE 10 | NNE 10 | SSW 16 | SSE 10 | S 19 | SSE 10 | SSE 8 | NNW 13 | SSW 15 | W 9 | SSW 14 | SSW 14 | SSW 8 | S 8 | SSW 8 | SW 17 | SW 18 | SSE 9 |
| kJ | 16 | 37 | 20 | 18 | 198 | 36 | 184 | 38 | 83 | 17 | 566 | 390 | 449 | 356 | 107 | 58 | 49 | 137 | 154 | 54 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 14 | ENE 13 | ENE 13 | ENE 13 | ENE 12 | ENE 12 | ENE 13 | ESE 7 | SSE 8 | — | — | — | — | — | ENE 8 | ENE 7 | ENE 7 | ENE 7 |
| kJ | 305 | 301 | 1700 | 1474 | 1616 | 1387 | 1127 | 1064 | 1521 | 860 | 836 | — | — | — | — | — | 250 | 314 | 237 | 208 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 33 | 16 | 16 | 31 | 16 | 31 | 16 | 118 | 126 | 231 | 136 | 32 | 32 | 10 | 14 | 31 | 38 | 33 | 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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