
Surf Forecasts:
Ammonias surf forecast from 13 Jul 2026:
- Most powerful swell: Monday 13 Jul, 5AM (local time) - 7ft (2.1m), 8s period, ENE swell with 501 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 2.1m 8s and forecast to arrive on Monday (Jul 13) at 5AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 7s period and expected on Tuesday (Jul 14) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Mon 13th Jul) | 7ft (2.1m) 8s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
G’day, Rusty here. Let’s be real—Ammonias is a reef break that’s fairly consistent but we’ve got a tricky run ahead. The first real surf worth paddling out for shows up on Monday morning, 13 July, with a 6ft swell from the ENE, period short at 8 seconds, and moderate cross-shore wind from the NE at 16 mph. The combined wave energy is moderate (712). It’s not clean, but it’s the best we’ve got to start with. Break is exposed, so it’ll take that swell. Crowds can be around sometimes, so you might have company.
The water temp is about average for the time of year, nothing unusual.
Monday afternoon sees the swell dip a touch to 5ft, still ENE, still cross-shore wind, energy down to 599. Still rideable but marginal.
Then we hit a dry spell. Tuesday 14 July through Sunday 19 July offers nothing but poor surf conditions—mostly cross-on winds, short period junk, or tiny swells. Some days have rain showers. The odd afternoon on Saturday 18 July has a 2ft SW swell with a long 14-second period and moderate cross-shore wind, but it’s only marginal at best. Not worth suiting up for.
We get a little flicker of hope Monday 20 July morning: 5ft ENE, short period, cross-shore wind, but still poor. Afternoon is tiny.
From Tuesday 21 July through Thursday 23 July mornings, it’s mostly marginal, with S swells around 3ft to 3ft, long periods 13–15 seconds, and cross-shore winds. The energy is moderate (549–652). It’s clean enough for a go if you’re desperate, but not a standout.
Now here’s where it gets interesting. The standout window is Friday 24 July through Sunday 26 July. Friday morning we see 6ft from the ENE, short period 7 seconds, but cross-shore wind from the NE at 12 mph. Combined energy is strong (824). Friday afternoon holds at 6ft ENE, still cross-shore, energy 744. Saturday 25 July morning is 6ft ENE, 8-second period, gentle cross-on wind from the E at 9 mph—still poor, but Saturday afternoon shows 6ft ENE, cross-shore, energy 834. Sunday 26 July keeps the 6ft to 6ft ENE swell, cross-shore, energy 787–857. This is the best stretch of the forecast: consistent chest-to-head-high waves, moderate energy, and the wind is mostly cross-shore, not too messy. It’s not glassy, but it’s the most surfable run we’ve got. The swell direction (ENE) is not the optimum for Ammonias (which likes SSE), but it’s still exposed, so it’ll work. These waves are a bit short-period, so expect a bit of a closeout on the reef, but there’ll be fun ones.
After that, Monday 27 July and Tuesday 28 July drop back to 3ft from the E, longer period 13–14 seconds, cross-shore wind, moderate energy (523–635). Marginal again.
The biggest gap of no real surf is from Tuesday 14 July through Sunday 19 July—six days of poor conditions. The week after that is where the action is, especially Friday 24 July to Sunday 26 July. That’s your best bet. Forecasts can change, but for now, mark those dates.
Rusty.
Short Range ForecastModerate rain (total 13mm), heaviest on Sun night. Warm (max 25°C on Mon morning, min 23°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 11mm), heaviest on Wed night. Warm (max 26°C on Thu morning, min 24°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sun 19 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 7 | SW 14 | SW 14 | SSW 17 | ENE 7 | ENE 7 | SSW 16 | SSW 16 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | S 15 | S 14 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph | |||||||||||||||||||||
522 | 383 | 288 | 222 | 189 | 186 | 200 | 178 | 91 | 314 | 179 | 180 | 206 | 230 | 198 | 157 | 144 | 210 | 152 | 208 | 276 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross |
High Tide | 2:08AM0.19m | 3:47PM0.78m | 3:04AM0.21m | 4:29PM0.77m | 3:58AM0.23m | 5:08PM0.73m | 4:55AM0.26m | 5:45PM0.67m | 5:57AM0.28m | 6:18PM0.59m | 7:07AM0.31m | 6:48PM0.51m | 8:26AM0.35m | 7:13PM0.43m | |||||||
Low Tide | 10:34PM0.12m | 7:55AM-0.11m | 11:06PM0.11m | 8:46AM-0.10m | 11:38PM0.10m | 9:34AM-0.07m | 00:10AM0.09m | 10:22AM-0.02m | 00:42AM0.08m | 11:11AM0.05m | 1:14AM0.06m | 12:04PM0.14m | 1:46AM0.05m | 1:11PM0.23m | |||||||
— | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | |
7:23 | — | 7:23 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | |
mm | 5 | — | — | 2 | 1 | — | — | 1 | 4 | 6 | 2 | 1 | — | — | — | — | 2 | — | — | — | 2 |
Temp °C | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 |
Feels °C | 23 | 23 | 24 | 23 | 24 | 24 | 23 | 25 | 26 | 26 | 27 | 26 | 25 | 25 | 26 | 26 | 27 | 26 | 26 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SSW 15 | SSW 14 | SW 14 | SW 14 | SW 14 | W 15 | W 15 | ENE 7 | NE 7 | W 14 | W 14 | SSW 14 | W 14 | SSW 16 | SSW 10 | S 14 | SSW 14 | SE 8 | S 12 | S 13 |
353 | 283 | 268 | 206 | 189 | 186 | 298 | 287 | 91 | 152 | 203 | 203 | 183 | 142 | 196 | 110 | 144 | 210 | 59 | 112 | 121 | |
Swell 2 Height (m) Direction Period (s) | SSE 12 | W 19 | W 18 | W 17 | W 16 | W 16 | SSW 13 | SW 13 | W 15 | SSW 16 | NNE 7 | SSW 13 | W 14 | SE 8 | W 14 | S 15 | S 9 | SSW 9 | SSW 8 | SSE 7 | SSE 7 |
47 | 112 | 150 | 142 | 257 | 251 | 109 | 162 | 279 | 314 | 48 | 113 | 146 | 30 | 134 | 157 | 59 | 62 | 36 | 33 | 18 | |
Swell 3 Height (m) Direction Period (s) | SE 8 | SSE 12 | SSE 11 | SE 7 | SSW 19 | SE 6 | SSW 17 | SSW 18 | NNE 8 | W 15 | SSW 16 | SSW 17 | SSE 8 | S 10 | SE 8 | SE 8 | NNE 7 | SE 8 | S 12 | SSW 7 | SSE 19 |
16 | 46 | 43 | 16 | 146 | 9 | 200 | 123 | 66 | 272 | 179 | 168 | 37 | 47 | 32 | 30 | 29 | 51 | 75 | 21 | 118 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 7 | NE 7 | NE 8 | NE 8 | ENE 7 | — | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
522 | 383 | 288 | 222 | 268 | 229 | 204 | 178 | — | 75 | 108 | 180 | 206 | 230 | 198 | 135 | 139 | 189 | 152 | 208 | 276 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 31 | 16 | 16 | 16 | 16 | 16 | 31 | 14 | 12 | 45 | 38 | 38 | 31 | 16 | 16 | 31 | 16 | 16 | 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











