Surf Forecasts:
Ammonias surf forecast from 13 Jul 2026:
- Most powerful swell: Sunday 19 Jul, 2PM (local time) - 6ft (1.8m), 7s period, E swell with 338 kJ wave energy.
Best Forecast Surf Conditions for Ammonias this week:
The most powerful waves expected at Ammonias in the next 16 days are 1.8m 7s and forecast to arrive on Sunday (Jul 19) at 2PM. 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 | 2PM (Sun 19th Jul) | 6ft (1.8m) 7s |
Table - best surf conditions forecast for Ammonias over the next 16 days.
The Lowdown
Hey crew, Rusty here, checking in on Ammonias. Gotta be honest, the next couple of weeks look pretty bleak. The water's sitting at a typical 79°, so nothing weird there, just a whole lot of nothing happening in the surf.
Looking at Monday the 13th, there's a 6ft swell from the ENE, but it's sloppy – only an 8-second period and a 25 km/h crosswind making for a choppy mess. The energy's moderate (711), but it ain't clean.
It really goes downhill from there. Tuesday the 14th drops into tiny, poor surf, and that's the pattern for days. Wednesday the 15th sees a bump to 5ft, but the wind's onshore and choppy with a short 7-second period. Through the rest of the week and into the weekend of the 20th, it's the same story – cross or cross-on winds, short-period swell, and marginal conditions. The energy varies from weak (118 on Wednesday afternoon) to moderate (518 on Sunday), but the quality just isn't there.
There's a glimmer near the end of the month. Monday the 27th afternoon shows a 3ft east swell with a long 15-second period and a gentle cross-shore breeze – that'll get clean. The energy's solid (579). Tuesday the 28th morning has 5ft from the east at 13 seconds, though it's a bit onshore and choppy. But Tuesday afternoon bumps to 5ft with that same gentle cross-shore wind, and the energy rockets up to 950 – that's a lot of power for this reef. This late groundswell is the only real standout, but it's nearly two weeks out, so don't pack your bags yet.
Given all the short-period chop and onshore wind, this stretch looks more interesting for a kite surfer than a paddle surfer. For the rest of us, it's a whole lot of waiting until maybe the very end of July.
Hang in there.
Rusty
Short Range ForecastModerate rain (total 14mm), heaviest on Wed afternoon. Warm (max 26°C on Mon afternoon, min 23°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 14mm), heaviest on Sat morning. Warm (max 26°C on Thu afternoon, min 24°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | |||||||||||||||
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 | ENE 7 | SW 14 | SW 14 | SSW 17 | ENE 7 | ENE 7 | SSW 16 | SSW 16 | SSW 17 | SSW 14 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | E 6 | E 7 | ENE 7 | ENE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 373 | 268 | 222 | 189 | 186 | 200 | 202 | 118 | 314 | 179 | 195 | 194 | 232 | 204 | 125 | 201 | 237 | 188 | 286 | 319 | 212 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | 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 | cross | cross |
High Tide | 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 | 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 | 2:18AM0.05m | ||||||||
 | |  |  | |  |  | | | | | | | | | | | | | |  | |
 | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — |
 | — | 7:23 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — |
mm | — | — | 1 | 2 | — | — | — | 4 | 7 | 2 | 1 | 2 | — | — | 3 | 4 | 2 | — | — | 1 | — |
Temp °C | 25 | 26 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 25 | 24 |
Feels °C | 24 | 25 | 23 | 24 | 24 | 24 | 25 | 26 | 25 | 26 | 27 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 24 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 15 | SSW 14 | SW 14 | SW 14 | SW 14 | W 15 | W 15 | ENE 7 | SSW 16 | W 14 | W 14 | SSW 14 | W 14 | SSW 16 | SE 8 | SSW 14 | SSW 10 | SSW 9 | S 12 | S 13 | S 11 |
| kJ | 283 | 268 | 206 | 189 | 186 | 298 | 287 | 118 | 314 | 203 | 203 | 183 | 140 | 196 | 60 | 154 | 74 | 59 | 112 | 125 | 65 |
Swell 2 Height (m) Direction Period (s) | SSE 12 | W 18 | W 17 | W 16 | W 16 | SSW 13 | SW 13 | W 15 | W 15 | SSW 16 | SSW 13 | W 14 | SSE 7 | W 14 | S 14 | S 9 | S 14 | SE 9 | SSW 8 | SSW 8 | S 18 |
| kJ | 55 | 150 | 142 | 257 | 251 | 109 | 162 | 279 | 272 | 179 | 113 | 146 | 37 | 134 | 93 | 43 | 146 | 38 | 37 | 12 | 97 |
Swell 3 Height (m) Direction Period (s) | W 19 | SSE 11 | SE 7 | SSW 19 | SW 19 | SSW 17 | SSW 18 | NNE 8 | SSE 9 | SSW 13 | SSW 17 | SE 7 | NNE 8 | SE 8 | S 10 | SE 8 | SE 8 | NNE 8 | SE 9 | S 19 | SE 9 |
| kJ | 112 | 43 | 16 | 146 | 93 | 200 | 123 | 47 | 32 | 113 | 195 | 27 | 32 | 28 | 53 | 28 | 20 | 21 | 27 | 62 | 14 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 7 | NE 7 | NE 8 | NE 8 | ENE 7 | — | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | E 6 | E 7 | ENE 7 | ENE 7 |
| kJ | 373 | 263 | 222 | 268 | 229 | 181 | 202 | — | 207 | 147 | 117 | 194 | 232 | 204 | 125 | 201 | 237 | 188 | 286 | 319 | 212 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 16 | 16 | 16 | 16 | 16 | 31 | 12 | 15 | 31 | 31 | 38 | 31 | 16 | 16 | 33 | 38 | 16 | 31 | 16 | 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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