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Ammonias Surf Forecast
/ HAW – Kaua'i (25 breaks) / Hawaii (267 breaks) /
Surf Forecasts:
Ammonias surfForecast / HAW – Kaua'i / USA
48hr Weather and Surf, issued 7 am Monday 18 May 2026 HSTForecast update in hr min s Forecast update imminent
Ammonias surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Ammonias sea temperature is
24.7° C
(Which is normal for this time of year)How big are the waves at Ammonias today?
The current surf forecast for Ammonias at 11AM is: 1.8m 8s primary swell from a East-northeast direction and 0.8m 14s secondary swell from a South-southwest direction, 0.6m 19s secondary swell from a South-southwest direction (forecast issued at 07:00am May 18). The wind direction is predicted to be cross-onshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 May) | 5.5ft (1.7m) | 8s |
| Afternoon (18 May) | 6ft (1.9m) | 8s |
| Evening (18 May) | 5.5ft (1.7m) | 8s |
Table - waves today at Ammonias. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastModerate rain (total 11mm), heaviest on Mon afternoon. Warm (max 25°C on Tue morning, min 23°C on Mon night). Mainly fresh winds. | ||||||||||||||||||||||||
Monday 18 | Tuesday 19 | Wednesday 20 | Thu 21 | |||||||||||||||||||||
5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | SSW 14 | SSW 14 | SSW 17 | SSW 15 | SSW 15 | SSW 16 | SSW 14 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | |
336 | 353 | 394 | 416 | 427 | 384 | 353 | 314 | 259 | 226 | 229 | 433 | 305 | 249 | 273 | 239 | 353 | 361 | 392 | 427 | 484 | 575 | 686 | 727 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross-on | cross-on | cross | cross | cross | cross | |
High Tide | 3:55AM0.15m | 5:47PM0.71m | 4:48AM0.13m | 6:40PM0.67m | 6:00AM0.12m | 7:36PM0.62m | ||||||||||||||||||
Low Tide | 9:49AM-0.13m | 1:27AM0.09m | 10:35AM-0.09m | 2:35AM0.09m | 11:26AM-0.04m | |||||||||||||||||||
 |  | | | |  |  | | |  | | | | |  | | | |  | | | | | | |
 | 5:56 | — | — | — | — | — | — | — | 5:56 | — | — | — | — | — | — | — | 5:56 | — | — | — | — | — | — | 5:56 |
 | — | — | — | — | 7:09 | — | — | — | — | — | — | — | 7:10 | — | — | — | — | — | — | — | 7:10 | — | — | 7:12 |
1 | 1 | 1 | 2 | 1 | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — | 1 | 1 | 1 | — | — | — | |
Temp °C | 23 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 24 | 25 | 25 | 25 | 24 | 23 | 23 | 23 | 24 | 24 | 24 | 24 | 23 | 23 | 23 |
24 | 25 | 24 | 23 | 24 | 24 | 23 | 23 | 23 | 24 | 25 | 25 | 25 | 24 | 23 | 22 | 22 | 23 | 23 | 23 | 23 | 21 | 21 | 21 | |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 14 | SSW 14 | SSW 14 | SSW 17 | SSW 15 | SSW 15 | SSW 16 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 13 |
 kJ | 236 | 233 | 233 | 229 | 166 | 161 | 158 | 158 | 161 | 226 | 229 | 433 | 305 | 249 | 273 | 239 | 215 | 158 | 165 | 179 | 152 | 145 | 104 | 101 |
Swell 2 Height (m) Direction Period (s) | SSE 8 | SSE 8 | SSW 19 | SSE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SSW 18 | SSW 18 | SE 7 | SE 7 | SE 7 | SE 7 | SSE 7 | SSE 7 | SE 9 | NNW 11 | NNW 11 | SE 7 | SE 7 | SSW 17 | SSW 17 |
| kJ | 39 | 39 | 251 | 34 | 26 | 24 | 26 | 23 | 23 | 207 | 176 | 24 | 26 | 25 | 23 | 18 | 19 | 41 | 25 | 39 | 13 | 13 | 101 | 93 |
Swell 3 Height (m) Direction Period (s) | SSE 10 | SSE 10 | SSE 7 | SSW 19 | SSW 19 | SE 10 | SE 10 | SSW 17 | S 17 | SSE 7 | SE 7 | SE 10 | SE 9 | NW 11 | NW 11 | NNW 12 | NNW 12 | NNW 12 | SE 7 | SSW 18 | NNW 11 | S 18 | SE 8 | SE 14 |
| kJ | 40 | 40 | 36 | 251 | 212 | 48 | 25 | 92 | 149 | 19 | 25 | 23 | 23 | 30 | 30 | 55 | 56 | 55 | 13 | 63 | 23 | 56 | 16 | 51 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
| kJ | 336 | 353 | 394 | 416 | 427 | 384 | 353 | 314 | 259 | 226 | 221 | 246 | 210 | 245 | 232 | 226 | 353 | 361 | 392 | 427 | 484 | 575 | 686 | 727 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 16 | 31 | 31 | 33 | 33 | 16 | 16 | 16 | 16 | 16 | 31 | 31 | 31 | 16 | 16 | 16 | 16 | 33 | 31 | 31 | 31 | 31 | 46 | 46 |
Best forecast wave conditions in Kaua'i | ||||||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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