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-onshore 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 5AM.
| 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
Alright, Rusty here. Let’s keep it real: the next 16 days at Ammonias are mostly a bust. The wind is stuck out of the ENE, so it’s side or side-on for this reef, and that’s a deal-breaker for clean waves. Water temp is about normal for this time of year.
The first ten days are ugly. Cross-chop and onshore slop, with the swell all over the place. Don’t even bother.
The only glimmer of hope shows up on Wednesday, July 29th. By the afternoon, we’ve got a 7ft groundswell from the ENE, period at 13 seconds, and the wind eases up to a light side breeze from the NE. The energy in the water is massive at 2990. That’s the best wave of the whole forecast. It’s big, though – over 7ft – so that’s expert-only stuff. The morning is still a bit choppy, but the afternoon is your window.
After that, it’s back to small, windy junk again by the end of the month. That Wednesday afternoon is the one and only highlight. Don’t hold your breath for anything else.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Fri night. 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 5mm), 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 8 | ENE 8 | ENE 7 | S 18 | ENE 8 | S 16 | S 15 | S 15 | S 14 | S 13 | SSW 24 | SSW 23 | SSW 22 | SSW 20 | SSW 20 | SSW 18 |
Wave Graph  | |||||||||||||||||||||
 kJ | 175 | 196 | 187 | 220 | 247 | 318 | 250 | 222 | 175 | 191 | 188 | 163 | 343 | 316 | 352 | 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-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross |
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 | 1 | — | — | — | — | — | — | — | — | — | — | 2 | 1 | — | 2 | — | — | 2 |
Temp °C | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 24 | 25 | 26 | 24 | 25 | 26 | 24 | 25 | 26 | 25 | 25 | 26 | 24 |
Feels °C | 26 | 26 | 26 | 26 | 26 | 25 | 24 | 25 | 23 | 24 | 26 | 23 | 25 | 26 | 24 | 25 | 25 | 25 | 24 | 25 | 23 |
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 | 58 | 113 | 125 | 65 | 67 | 188 | 163 | 343 | 316 | 352 | 285 | 276 | 212 | 528 | 399 | 469 |
Swell 2 Height (m) Direction Period (s) | SSW 16 | W 14 | SE 7 | WNW 13 | SE 8 | SSW 12 | SE 9 | SSE 8 | S 18 | S 16 | SSW 10 | S 12 | SW 17 | SW 16 | SSW 26 | SSW 24 | SSW 23 | SSW 22 | S 13 | S 13 | S 11 |
| kJ | 100 | 134 | 26 | 56 | 43 | 47 | 37 | 28 | 162 | 137 | 62 | 112 | 73 | 65 | 224 | 437 | 426 | 480 | 206 | 166 | 81 |
Swell 3 Height (m) Direction Period (s) | SSW 12 | SSW 12 | W 13 | SSW 8 | WNW 13 | W 12 | W 12 | S 19 | SE 6 | SE 9 | S 13 | SW 16 | SSW 11 | SE 6 | E 11 | NE 7 | E 11 | E 13 | E 12 | E 12 | S 13 |
| kJ | 56 | 54 | 87 | 11 | 56 | 26 | 25 | 113 | 10 | 19 | 29 | 69 | 25 | 10 | 39 | 23 | 89 | 116 | 75 | 103 | 85 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 7 | ENE 6 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | E 6 | E 6 | ENE 6 | E 7 |
| kJ | 175 | 192 | 180 | 220 | 247 | 318 | 250 | 222 | 175 | 191 | 169 | 148 | 180 | 136 | 141 | 68 | 93 | 137 | 194 | 160 | 284 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 38 | 31 | 31 | 16 | 31 | 31 | 16 | 16 | 16 | 16 | 31 | 31 | 14 | 31 | 31 | 16 | 31 | 31 | 16 | 31 | 31 |
Best forecast wave conditions in Kaua'i | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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