Surf Forecasts:
Ammonias surf forecast from 18 Jul 2026:
- Most powerful swell: Saturday 25 Jul, 8AM (local time) - 3.5ft (1.0m), 20s period, S swell with 775 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 20s and forecast to arrive on Saturday (Jul 25) at 8AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 13s period and expected on Saturday (Jul 18) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Sat 25th Jul) | 3.5ft (1.0m) 20s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Right then, Rusty here with the lowdown for the Ammonias area. Going to be a tough run for a while, folks.
The long and short of it is that for the next 16 days, there’s not a single day I’d call a must-surf. We’ve got a long stretch of poor and marginal conditions starting from the 18th of July and running through to the start of August. The one glimmer comes right at the tail end, around the 27th and 28th of July, when the swell energy finally picks up into strong territory, reading 1498 on the morning of the 27th and climbing to 1654 on the 28th morning. That’s proper energy, but it comes with its own challenges.
For Ammonias, a reef break, the winds are almost always a moderate cross-shore with a cross-chop, so you’re never going to get glassy perfection. The standout, if you can call it that, is Monday the 27th of July and Tuesday the 28th of July. The swell is around 5ft to 6ft, coming from the east with a long period – 16 seconds on the Monday morning and 14 seconds on the Tuesday morning. That’s some quality groundswell energy. With that period and east direction on a reef, you should get some nice, lined-up waves. The wind is still cross-shore though, so it won’t be totally clean, but it’s the best window we’ve got. The swell direction from the east is not the ideal SSE direction for this spot, so it won’t be at its best, but it’s still the pick of a pretty poor bunch.
The rest of the period is a write-off. The first week is dominated by short-period, onshore windswell from the east-northeast. The combined energy is moderate but the quality is consistently poor. There’s a bit of a south-southwest groundswell around the 22nd to 25th of July with very long periods (over 20 seconds), but it’s small and the wind is still cross or cross-onshore. Not worth the effort. From the 29th of July, it’s back to short-period east-northeast windswell with poor winds.
So, to sum it up: a long quiet spell. The only real chance of a surf is on the 27th and 28th of July if you’re willing to deal with the wind. Otherwise, I’d be looking elsewhere.
Catch you later,
Rusty
Short Range ForecastMostly dry. Warm (max 26°C on Sat morning, min 23°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Tue night. Warm (max 26°C on Tue morning, min 23°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | |||||||||||||||
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 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | S 16 | ENE 7 | S 15 | S 14 | S 13 | SSW 24 | SSW 23 | SSW 22 | SSW 20 | SSW 20 | SSW 18 | SSW 18 | SSW 17 | S 21 |
Wave Graph  | |||||||||||||||||||||
 kJ | 276 | 312 | 327 | 306 | 264 | 237 | 191 | 188 | 172 | 343 | 316 | 347 | 437 | 426 | 480 | 528 | 399 | 469 | 356 | 428 | 416 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross |
High Tide | 6:48PM0.51m | 8:26AM0.35m | 7:13PM0.43m | 9:50AM0.41m | 7:25PM0.35m | 11:06AM0.46m | 12:06PM0.52m | 12:55PM0.57m | 1:36PM0.61m | 00:21AM0.18m | |||||||||||
Low Tide | 12:04PM0.14m | 1:46AM0.05m | 1:11PM0.23m | 2:18AM0.05m | 2:53PM0.29m | 2:52AM0.04m | 3:30AM0.04m | 4:16AM0.04m | 5:07AM0.04m | 10:06PM0.17m | |||||||||||
 | |  | | |  | | | |  | |  |  | | | | | | | | | |
 | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — |
 | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:21 | — | — | 7:21 | — | — | 7:21 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 4 | 1 | — | — | — | — | 1 | 2 | — | 3 |
Temp °C | 26 | 26 | 24 | 25 | 26 | 24 | 25 | 26 | 24 | 26 | 26 | 25 | 25 | 25 | 24 | 25 | 26 | 24 | 25 | 25 | 24 |
Feels °C | 25 | 25 | 23 | 24 | 25 | 23 | 24 | 25 | 23 | 26 | 25 | 25 | 24 | 24 | 23 | 24 | 25 | 23 | 24 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 14 | SE 9 | S 12 | S 13 | SSW 11 | SSW 12 | S 16 | S 12 | S 15 | S 14 | S 13 | S 14 | SSW 23 | S 13 | SSW 20 | S 13 | SSW 18 | SSW 18 | SSW 17 | SSW 16 |
| kJ | 204 | 210 | 79 | 113 | 125 | 73 | 75 | 188 | 108 | 343 | 316 | 347 | 311 | 426 | 212 | 528 | 222 | 469 | 356 | 428 | 302 |
Swell 2 Height (m) Direction Period (s) | WNW 13 | SE 8 | S 12 | SSE 9 | SE 7 | S 18 | S 16 | SSW 10 | S 15 | SW 17 | SW 16 | SSW 26 | SSW 24 | S 13 | SSW 22 | S 13 | SSW 20 | E 11 | S 12 | S 12 | S 21 |
| kJ | 56 | 55 | 75 | 49 | 22 | 162 | 137 | 62 | 165 | 73 | 65 | 224 | 437 | 128 | 480 | 206 | 399 | 88 | 190 | 141 | 416 |
Swell 3 Height (m) Direction Period (s) | SSW 8 | WNW 13 | W 12 | W 12 | S 19 | SE 6 | SW 18 | SE 7 | SSW 16 | SSW 11 | SE 6 | SW 15 | E 12 | S 10 | E 12 | E 12 | E 12 | S 13 | ENE 11 | S 21 | S 12 |
| kJ | 11 | 56 | 26 | 25 | 113 | 14 | 82 | 12 | 105 | 24 | 10 | 60 | 72 | 78 | 108 | 104 | 137 | 85 | 37 | 329 | 136 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 6 | ENE 7 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 7 |
| kJ | 276 | 312 | 327 | 306 | 264 | 237 | 191 | 181 | 172 | 128 | 136 | 163 | 187 | 158 | 126 | 268 | 212 | 293 | 254 | 339 | 404 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 31 | 16 | 31 | 31 | 16 | 31 | 31 | 16 | 31 | 31 | 33 | 38 | 16 | 16 | 31 | 16 | 16 | 33 | 31 | 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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