Surf Forecasts:
Ammonias surf forecast from 31 Jul 2026:
- Most powerful swell: Sunday 2 Aug, 2AM (local time) - 10ft (3.0m), 8s period, ENE swell with 1,046 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 3.0m 8s and forecast to arrive on Sunday (Aug 02) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Sun 2nd Aug) | 10ft (3.0m) 8s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s take a look at what’s shaping up for Ammonias. It’s a bit of a rough patch to start, but there’s a flicker of hope late in the game.
The next couple of weeks are looking pretty average for Ammonias, with a lot of cross-shore wind messing things up. The first week is a write-off, really. From Friday the 31st to Friday the 7th of August, the wind is a constant cross or cross-onshore, never letting the surf clean up. The swell is between 4ft and 8ft, but the period is short, 6 to 8 seconds, so it’s just weak, lumpy, cross-chop. The combined energy is moderate at best, peaking at 1247 on Saturday the 1st, but with that 18 mph fresh cross-breeze, it’s just a mess. This is a reef break, so that short-period, wind-affected swell is going to be a frustrating, bumpy ride. The water temp is a normal 80°F for the time of year.
There’s a noticeable gap from the 8th to the 11th of August where the surf is still poor, with swell dropping to 3ft or less. The wind stays onshore or cross-shore, and the water is just choppy.
Then we get a little glimmer. On the 12th of August (Wednesday) morning, a new S swell arrives at 4ft with a very long period of 18 seconds. The combined energy jumps to 1206, which is a proper moderate pulse. The wind is a cross-shore from the ENE at 12 mph, which is the best we’ve seen all fortnight. This is a reef break, so that long-period groundswell is ideal here – it should wrap in and offer some proper, powerful lines. It’s not a standout by any means, but it’s the only time the score ticks up to a 2. It’s not quite clean enough to be a classic, but it’s the best on offer.
The following days, the 13th and 14th, see the swell drop back down and the wind turning onshore again, so the window is narrow.
Nothing in this outlook is a true standout. The 12th of August morning is the best bet, but even then, it’s a marginal call with that cross-breeze. The setup here is more interesting for a kiter than a paddle surfer, given the persistent wind and choppy conditions.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Sat afternoon. Warm (max 27°C on Fri morning, min 24°C on Sat night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Wed night. Warm (max 26°C on Mon afternoon, min 24°C on Mon morning). Wind will be generally light. | ||||||||||||||||||||
Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | |||||||||||||||
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) | E 8 | E 7 | E 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 9 | ENE 9 | ENE 8 | ENE 8 | ENE 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 253 | 388 | 726 | 880 | 871 | 1046 | 819 | 699 | 567 | 394 | 353 | 306 | 583 | 515 | 487 | 325 | 227 | 213 | 181 | 232 | 156 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross | cross | cross | cross | cross-on | cross-on | cross | cross |
High Tide | 5:08PM0.61m | 5:22AM0.32m | 5:32PM0.57m | 6:19AM0.34m | 5:54PM0.51m | 7:26AM0.38m | 6:14PM0.44m | 8:45AM0.44m | 6:28PM0.37m | 10:10AM0.50m | 11:24AM0.57m | ||||||||||
Low Tide | 10:03AM0.04m | 11:56PM0.09m | 10:44AM0.09m | 00:22AM0.07m | 11:33AM0.16m | 00:50AM0.05m | 12:35PM0.23m | 1:21AM0.04m | 2:08PM0.29m | 1:58AM0.03m | 2:46AM0.02m | 3:47AM0.01m | |||||||||
 |  |  | |  |  | | | | | | | | | | | |  |  | | | |
 | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — |
 | — | 7:16 | — | — | 7:16 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:14 | — |
mm | — | — | — | — | 1 | 3 | 1 | — | — | — | — | — | — | — | — | — | — | 4 | 2 | 2 | 1 |
Temp °C | 27 | 27 | 25 | 26 | 25 | 24 | 26 | 26 | 25 | 25 | 26 | 24 | 25 | 25 | 25 | 26 | 26 | 25 | 26 | 25 | 25 |
Feels °C | 27 | 26 | 25 | 24 | 23 | 21 | 24 | 24 | 23 | 24 | 26 | 24 | 25 | 26 | 26 | 27 | 28 | 28 | 28 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | S 12 | SW 15 | SSW 15 | E 15 | E 15 | E 14 | E 14 | E 14 | E 13 | E 13 | E 13 | E 12 | SSW 12 | SSW 12 | SSW 11 | ENE 10 | ENE 9 | SSW 15 | SSW 14 | SSW 14 | SSW 14 |
| kJ | 146 | 232 | 144 | 205 | 150 | 199 | 194 | 140 | 123 | 86 | 82 | 104 | 47 | 45 | 40 | 325 | 227 | 87 | 81 | 80 | 81 |
Swell 2 Height (m) Direction Period (s) | SSW 16 | S 12 | E 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SW 13 | SSW 13 | SE 7 | SSW 12 | SE 6 | SSE 8 | SSW 15 | SSW 11 | SSW 15 | S 12 | SE 6 | SSE 11 | S 11 |
| kJ | 169 | 141 | 159 | 123 | 123 | 131 | 75 | 68 | 42 | 34 | 18 | 48 | 10 | 27 | 91 | 39 | 87 | 46 | 9 | 43 | 38 |
Swell 3 Height (m) Direction Period (s) | E 16 | E 15 | S 12 | S 11 | S 11 | S 11 | N 9 | SE 8 | SE 7 | SE 7 | SSW 12 | SE 7 | W 13 | SW 16 | SSE 13 | S 13 | SSW 11 | SE 6 | SSW 10 | SSW 10 | SE 8 |
| kJ | 174 | 167 | 70 | 39 | 38 | 20 | 14 | 11 | 12 | 14 | 50 | 11 | 31 | 69 | 58 | 52 | 38 | 8 | 33 | 18 | 14 |
Wind waves Height (m) Direction Period (s) | E 8 | E 7 | E 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 12 | ENE 11 | ENE 11 | — | — | ENE 9 | ENE 8 | ENE 8 | ENE 6 |
| kJ | 253 | 388 | 726 | 880 | 871 | 1046 | 819 | 699 | 567 | 394 | 353 | 306 | 583 | 515 | 487 | — | — | 213 | 181 | 232 | 156 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 38 | 33 | 31 | 46 | 301 | 46 | 33 | 38 | 16 | 31 | 31 | 16 | 31 | 31 | 16 | 31 | 12 | 31 | 16 | 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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