
Surf Forecasts:
Ammonias surf forecast from 26 Jul 2026:
- Best quality surf: Wednesday 29 Jul, 5PM (local time) - 8ft (2.5m), 11s period, ENE swell with cross-offshore winds.
- Most powerful swell: Tuesday 28 Jul, 8PM (local time) - 8ft (2.4m), 13s period, ENE swell with 1,930 kJ wave energy.
- Next surfable swell (1★+): Wednesday 29 Jul, 5PM (local time) - 8ft (2.5m), 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 Wednesday (Jul 29) at 5PM. The primary swell is predicted to be 2.5m and 11s period with a secondary swell of 0.8m and 14s. 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 2.4m 13s and forecast to arrive on Tuesday (Jul 28) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.2m 10s period and expected on Wednesday (Jul 29) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Wed 29th Jul) | 8ft (2.5m) 11s |
| Best Surf | 5PM (Wed 29th Jul) | 8ft (2.5m) 11s |
| Most Powerful | 8PM (Tue 28th Jul) | 8ft (2.4m) 13s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Right, let’s take a look at what’s on offer for Ammonias over the next couple of weeks. I’ll be straight with you: this forecast has a lot of “maybe” days, but there is one real window of quality if the planets align. The break is a reef setup, so it wants the right swell direction and not too much wind.
For the first week, starting this Sunday, 26 July, we’ve got some long-period groundswell in the water – a solid 16 seconds – but a moderate cross-shore breeze messes things up. Water temp is 80°, bang on average for this time of year, so no surprises there. Combined swell energy is in the strong range (1246), but the surf is just marginal. Waves around 3 ft from the SSW, but it’s lumpy and choppy. Not worth racing out for.
Monday 27 July is similar: cross-shore wind, moderate energy (1050 down to 969), and swell turning more easterly. Still only 4 ft, still not clean. The period drops to 14 seconds, still a groundswell. I’d say keep the board in the car.
Now, Tuesday 28 July sees a bump in size: 6 ft to 7 ft from the east, period dropping to 13 seconds. Combined energy climbs to 1487, then 1602. The wind finally swings cross-offshore Tuesday afternoon, meaning clean faces. That’s our first glimmer. The surf is still only rated marginal, but Tuesday afternoon looks the pick of the early days.
Wednesday 29 July is the standout. Morning brings 8 ft from the ENE with a cross-offshore breeze – clean. Combined energy is strong at 1519. By Wednesday afternoon, it jumps to 8 ft from the ENE, period 11 seconds, and the wind goes light and cross-offshore – 9 mph. Clean faces, solid swell, and a rating of “excellent for experienced surfers.” This is the session to aim for. The wave state says “clean,” and that’s gold. However, at 8 ft this is getting into expert territory only. Not one for beginners.
Thursday 30 July sees the swell drop back and wind swing onshore, so that window closes quickly. Friday 31 July into Saturday 1 August: swell bumps up again, but period is short (7-8 seconds) and wind is cross or cross-on, choppy. Combined energy hits 1199-1217 on Saturday but with 19 mph winds and lumpy conditions – poor. This is more kite-surfing weather than paddle surfing.
Sunday 2 August to Wednesday 5 August: size slowly drops from 8 ft to 3 ft, periods shorten, wind stays cross or cross-on. Nothing special. Occasional clean windows but nothing that screams “go”.
From Thursday 6 August onward, it’s pretty bleak: small, short period, mostly onshore. A few pulses of SSW groundswell on the 6th, 7th, and 9th but very small (1 ft to 2 ft) and cross-shore winds. The week after that shows a slight bump on Monday 10 August – 7 ft from the ENE but period only 7 seconds, cross-shore wind, and the surf is poor. Not recommended.
Best bet: Wednesday 29 July afternoon. Clear sky, NNE 9 mph cross-offshore, 8 ft ENE at 11 seconds, strong energy (1812), and clean. Expert only. If you’re not an expert, Tuesday 28 July afternoon is your next best – 7 ft, cross-offshore, but still moderate difficulty.
Otherwise, there are long gaps of mediocrity, especially from 31 July through 5 August and most of the second week. Stay hopeful, forecasts change.
Rusty
Short Range ForecastMostly dry. Warm (max 26°C on Mon afternoon, min 23°C on Sun night). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Thu morning, min 24°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | |||||||||||||||
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 8 | ENE 8 | E 15 | E 14 | E 14 | E 14 | E 13 | E 13 | E 13 | ENE 11 | ENE 11 | S 14 | ENE 8 | ENE 8 | E 8 | ENE 7 | ENE 8 | E 8 | E 8 | E 8 | ENE 8 |
Wave Graph | |||||||||||||||||||||
575 | 452 | 424 | 478 | 439 | 622 | 1285 | 1380 | 1755 | 1234 | 1511 | 293 | 315 | 298 | 287 | 365 | 416 | 670 | 825 | 857 | 893 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross-off | cross | cross-off | cross-off | cross-off | cross-off | glassy | on | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross |
High Tide | 2:48PM0.65m | 1:57AM0.21m | 3:20PM0.66m | 2:33AM0.23m | 3:50PM0.67m | 3:10AM0.25m | 4:18PM0.66m | 3:49AM0.27m | 4:44PM0.65m | 4:33AM0.29m | 5:08PM0.61m | 5:22AM0.32m | 5:32PM0.57m | ||||||||
Low Tide | 10:20PM0.16m | 7:31AM-0.01m | 10:33PM0.16m | 8:11AM-0.02m | 10:50PM0.15m | 8:48AM-0.01m | 11:10PM0.13m | 9:25AM0.00m | 11:32PM0.11m | 10:03AM0.04m | 11:56PM0.09m | 10:44AM0.09m | 00:22AM0.07m | ||||||||
6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | |
— | 7:20 | — | — | 7:19 | — | — | 7:19 | — | — | 7:17 | — | — | 7:17 | — | — | 7:16 | — | — | 7:16 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 25 | 25 | 24 | 25 | 26 | 24 | 26 | 26 | 25 | 26 | 26 | 25 | 27 | 27 | 26 | 26 | 27 | 25 | 26 | 26 | 25 |
Feels °C | 23 | 23 | 23 | 24 | 25 | 23 | 26 | 26 | 25 | 27 | 27 | 27 | 29 | 29 | 28 | 26 | 26 | 24 | 24 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 16 | E 15 | E 14 | E 14 | E 14 | E 13 | E 13 | E 13 | ENE 11 | ENE 11 | NE 9 | ENE 8 | S 13 | S 13 | S 12 | SW 15 | SSW 15 | E 15 | E 14 | E 15 |
575 | 452 | 424 | 478 | 439 | 622 | 1285 | 1380 | 1755 | 1234 | 1511 | 639 | 315 | 276 | 206 | 146 | 232 | 144 | 210 | 199 | 210 | |
Swell 2 Height (m) Direction Period (s) | E 15 | E 15 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | S 13 | SSW 13 | S 14 | S 14 | S 14 | S 13 | SSW 18 | SSW 16 | SSW 16 | S 12 | E 14 | SSW 14 | SSW 14 | SSW 14 |
107 | 290 | 416 | 292 | 284 | 213 | 189 | 176 | 137 | 268 | 264 | 293 | 284 | 207 | 175 | 169 | 104 | 148 | 125 | 123 | 133 | |
Swell 3 Height (m) Direction Period (s) | E 12 | S 11 | SSE 11 | S 10 | S 11 | SE 11 | SE 9 | S 16 | S 16 | SW 21 | SSW 19 | SW 19 | SW 18 | E 18 | N 9 | E 15 | E 15 | S 12 | S 11 | S 11 | S 11 |
47 | 20 | 12 | 8 | 9 | 18 | 13 | 46 | 78 | 17 | 37 | 58 | 154 | 25 | 14 | 113 | 163 | 70 | 39 | 38 | 21 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | NE 7 | NE 9 | NNE 9 | NE 6 | NNE 7 | — | — | — | ENE 8 | E 8 | ENE 7 | ENE 8 | E 8 | E 8 | E 8 | ENE 8 |
517 | 403 | 353 | 272 | 237 | 258 | 237 | 270 | 98 | 88 | — | — | — | 298 | 287 | 365 | 416 | 670 | 825 | 857 | 893 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 31 | 16 | 16 | 16 | 14 | 16 | 16 | 14 | 10 | 0 | 0 | 32 | 31 | 46 | 46 | 38 | 31 | 38 | 301 | 38 |
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










