
Surf Forecasts:
Ammonias surf forecast from 28 Jul 2026:
- Best quality surf: Wednesday 29 Jul, 5AM (local time) - 6.5ft (2.0m), 11s period, E swell with cross-offshore winds.
- Most powerful swell: Tuesday 28 Jul, 5PM (local time) - 6.5ft (2.0m), 13s period, E swell with 1,380 kJ wave energy.
- Next surfable swell (1★+): Wednesday 29 Jul, 5AM (local time) - 6.5ft (2.0m), 11s period with E 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 5AM. The primary swell is predicted to be 2.0m and 11s period with a secondary swell of 0.7m 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 2.0m 13s and forecast to arrive on Tuesday (Jul 28) at 5PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 7s period and expected on Monday (Jul 27) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Wed 29th Jul) | 6.5ft (2.0m) 11s |
| Best Surf | 5AM (Wed 29th Jul) | 6.5ft (2.0m) 11s |
| Most Powerful | 5PM (Tue 28th Jul) | 6.5ft (2.0m) 13s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Alright, Rusty here, giving you the lowdown on Ammonias. This is a reef break, and it's not a spot that just fires every day.
Right now, we’re looking at a bit of a slow start. The first solid wave energy we see is on Monday, 27th July, with a 4ft swell from the east, but it's pretty messy. The wind is a cross-shore breeze at 15 mph, and it's creating a cross-chop. The combined energy is moderate (732), but the conditions are just poor. Nothing to get excited about.
Tuesday, 28th July is where things start to look a little more interesting. The swell jumps up to 6ft from the east on Tuesday morning, with a period of 13 seconds, which is a solid groundswell. The combined energy is strong (1461). The wind is still cross-shore, but it’s a bit lighter. The afternoon is better, with a 7ft east swell and a nice cross-offshore breeze that cleans it up. The score is a bit better for the afternoon, but it’s still a marginal call.
Wednesday, 29th July is the standout. This is the morning to be in the water. We’ve got a 7ft swell from the east-northeast, with a period of 10 seconds. The combined energy is strong (1246). The wind is a light cross-offshore breeze from the north-northwest, and it’s clean. The conditions are rated as excellent for experienced surfers. Then the afternoon gets even better. The wind drops to completely glassy, zero wind, with the swell still a solid 7ft from the east-northeast. This is the best of the whole forecast. The water temperature is 80°, which is about average for the time of year, so no surprise there.
After Wednesday, it drops off. Thursday, 30th July the swell crashes down to 3ft from the south, and the wind goes onshore. It’s a write-off. Friday, 31st July through to Sunday, 9th August is a long stretch of poor conditions. The wind is mostly a cross or cross-onshore breeze from the east-northeast at 15 to 19 mph, and the swell is all short-period windswell (7 to 8 seconds). The combined energy is moderate to strong, but the chop is just too much. It’s a big gap of about ten days with nothing worth paddling out for.
Even when the swell is over 8ft on the 1st and 2nd of August, it’s too big for beginners, and the wind is a fresh breeze making it lumpy. For a reef break, the wind direction is just wrong for most of this period.
We finally get a change in the second week. On Monday, 10th August, the swell direction swings to the south-southwest. The size is small, around 3ft to 4ft, but the period is very long, 17 seconds. That’s a proper groundswell. The combined energy is moderate. The wind is still a cross-onshore, so it’s not clean, but it’s a sign of a change.
Tuesday, 11th August holds that same south-southwest groundswell, size around 3ft to 4ft, with periods of 16 to 17 seconds. The wind is light, and the combined energy is getting up there (1087). The conditions are marginal, but it's the best we’ve seen since that Wednesday. The light wind is a major positive, and that long period will push some nice lines through the reef.
So, to wrap it up: the best on offer is Wednesday, 29th July. The morning has a clean 7ft east-northeast swell with a light offshore breeze, and the afternoon goes glassy. That’s the one to circle. The second week has a promising but less certain long-period groundswell from the south-southwest around the 10th and 11th of August, but the wind isn't perfect. Crowds are likely at Ammonias, so get there early for that Wednesday session.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Tue morning. Warm (max 27°C on Tue afternoon, min 24°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Sat night. Warm (max 27°C on Thu afternoon, min 24°C on Fri night). Mainly fresh winds. | |||||||||||||||||||
Mon 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | ||||||||||||||
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 14 | E 14 | E 13 | E 13 | E 12 | ENE 10 | ENE 10 | ENE 9 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | E 7 | ENE 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
Wave Graph | ||||||||||||||||||||
439 | 631 | 1247 | 1380 | 1136 | 1040 | 782 | 377 | 284 | 276 | 259 | 319 | 394 | 636 | 735 | 836 | 807 | 801 | 699 | 612 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross | cross-off | cross-off | cross-off | glassy | cross | on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross |
High Tide | 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 | 6:19AM0.34m | 5:54PM0.51m | |||||||
Low Tide | 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 | 11:33AM0.16m | 00:50AM0.05m | |||||||
— | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | |
7:19 | — | — | 7:19 | — | — | 7:17 | — | — | 7:17 | — | — | 7:16 | — | — | 7:16 | — | — | 7:15 | — | |
mm | — | — | 2 | — | — | — | — | 2 | 2 | — | — | — | — | — | — | — | 3 | 1 | — | — |
Temp °C | 26 | 25 | 26 | 27 | 25 | 27 | 27 | 26 | 27 | 27 | 26 | 26 | 27 | 25 | 26 | 26 | 25 | 25 | 25 | 24 |
Feels °C | 25 | 24 | 27 | 28 | 26 | 30 | 32 | 29 | 29 | 29 | 27 | 26 | 26 | 24 | 23 | 24 | 24 | 23 | 23 | 22 |
Swell 1 Height (m) Direction Period (s) | E 14 | E 14 | E 13 | E 13 | E 12 | ENE 10 | ENE 10 | ENE 9 | ENE 8 | S 13 | S 13 | S 12 | SW 15 | SSW 15 | E 15 | E 15 | E 14 | E 14 | E 14 | E 14 |
439 | 631 | 1247 | 1380 | 1136 | 1040 | 782 | 377 | 270 | 276 | 206 | 146 | 232 | 144 | 150 | 213 | 199 | 195 | 195 | 132 | |
Swell 2 Height (m) Direction Period (s) | SSW 15 | SSW 14 | SSW 14 | S 13 | SSW 13 | S 14 | S 14 | S 14 | S 13 | SW 18 | SSW 16 | SSW 16 | S 12 | E 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SE 8 |
284 | 213 | 189 | 130 | 137 | 206 | 264 | 297 | 284 | 152 | 175 | 169 | 104 | 150 | 123 | 123 | 133 | 77 | 68 | 15 | |
Swell 3 Height (m) Direction Period (s) | S 11 | SE 11 | SE 10 | S 16 | S 16 | NNE 9 | SSW 19 | SW 19 | SW 18 | N 9 | SE 6 | E 16 | E 15 | S 12 | S 11 | S 11 | S 11 | N 9 | SE 9 | SW 13 |
9 | 18 | 25 | 46 | 77 | 44 | 37 | 58 | 154 | 6 | 14 | 174 | 167 | 70 | 39 | 38 | 21 | 14 | 20 | 42 | |
Wind waves Height (m) Direction Period (s) | NE 7 | NE 7 | NE 9 | NNE 9 | NNE 6 | — | — | — | — | ENE 8 | ENE 7 | ENE 7 | ENE 7 | E 7 | ENE 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
281 | 322 | 231 | 264 | 88 | — | — | — | — | 246 | 259 | 319 | 394 | 636 | 735 | 836 | 807 | 801 | 699 | 612 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 31 | 14 | 16 | 14 | 14 | 0 | 0 | 11 | 38 | 15 | 46 | 46 | 46 | 31 | 320 | 299 | 132 | 33 | 38 | 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










