Surf Forecasts:
Kalapaki Beach surf forecast from 6 Aug 2026:
- Most powerful swell: Thursday 13 Aug, 2AM (local time) - 5ft (1.5m), 16s period, S swell with 1,193 kJ wave energy.
Best Forecast Surf Conditions for Kalapaki Beach this week:
The most powerful waves expected at Kalapaki Beach in the next 16 days are 1.5m 16s and forecast to arrive on Thursday (Aug 13) at 2AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Thu 13th Aug) | 5ft (1.5m) 16s |
Table - best surf conditions forecast for Kalapaki Beach over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down the next couple of weeks.
Looking at the charts, it’s a slow start. The first week is mostly poor – the wind is coming from the ENE at 12 to 15 mph, cross or cross-onshore, and the water’s all chopped up. If you’ve got a kite, this looks more interesting than a paddle. There’s a real gap from the beginning until the 9th of August when we start seeing marginal conditions. On Sunday the 9th, the swell picks up to about 6ft from the ENE, but it’s still lumpy from the wind.
The best bet in the whole 16-day window is Kalapaki Beach (Kauai). It’s a shallow reef, good for beginners, and it’s fairly consistent. The standout moment is on the 12th of August. The morning and afternoon both show a long-period groundswell from the S at 18 seconds, with waves around 3ft to 4ft. That’s a proper groundswell – longer lines, better shape, especially on a reef. The combined energy is strong, hitting 1083 then 1335. The wind is still a cross-onshore from the ENE at 12 mph, so it’s not glassy, but the energy is there. This is the best wave quality of the whole run, and the water temp is about average for the season.
The 13th of August has a similar S swell, 5ft to 5ft with a 15-16 second period, and energy still in the 1000s, but the wind stays cross-onshore. The 15th to the 17th of August sees the swell jump to 8ft to 8ft from the ENE with a short period of 8 seconds and energy over 1000, but the wind is still a cross-onshore at 15-18 mph, making it lumpy and poor. That 8ft on the 17th is only for experts, and the short period means it won’t be clean.
From the 18th to the 21st of August, it fades out. Poor to marginal conditions, small swell from the S or SW, and energy dropping to 100-500. The 20th and 21st have lighter winds, but the waves are tiny at 2ft to 2ft.
So, the real call is: Kalapaki Beach on the 12th of August is your one true standout. It’s a promising long-range pick, but it’s not for beginners with that strong energy. The rest of the run is poor or marginal at best. Keep an eye on it, but don’t get your hopes up too high.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Thu night. Warm (max 26°C on Thu morning, min 24°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Sun morning. Warm (max 26°C on Sun afternoon, min 24°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | ||||||||||||||
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 9 | ENE 8 | ENE 6 | ENE 5 | SW 21 | SW 20 | SSW 19 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | S 20 |
Wave Graph  | |||||||||||||||||||
 kJ | 90 | 197 | 119 | 91 | 125 | 98 | 148 | 182 | 201 | 260 | 293 | 310 | 319 | 222 | 234 | 296 | 222 | 207 | 611 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross | cross-on |
High Tide | 11:24AM0.57m | 12:26PM0.64m | 1:18PM0.69m | 00:17AM0.19m | 2:05PM0.73m | 1:24AM0.22m | 2:47PM0.75m | 2:17AM0.26m | 3:26PM0.74m | 3:06AM0.30m | |||||||||
Low Tide | 2:46AM0.02m | 3:47AM0.01m | 4:56AM-0.01m | 9:20PM0.16m | 6:02AM-0.03m | 9:35PM0.15m | 7:01AM-0.05m | 9:56PM0.13m | 7:54AM-0.06m | 10:20PM0.12m | |||||||||
 |  | |  | |  |  | | | |  | | | |  |  | | |  | |
 | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — |
 | 7:15 | — | 7:14 | — | — | 7:13 | — | — | 7:13 | — | — | 7:12 | — | — | 7:10 | — | — | 7:10 | — |
mm | — | — | — | 1 | — | — | 1 | — | — | — | 1 | 1 | — | — | 1 | — | — | — | — |
Temp °C | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 26 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 26 | 25 | 27 | 27 | 26 | 27 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | ENE 9 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | S 18 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 13 |
| kJ | 90 | 81 | 80 | 81 | 78 | 74 | 110 | 113 | 102 | 137 | 98 | 156 | 263 | 196 | 234 | 296 | 222 | 207 | 299 |
Swell 2 Height (m) Direction Period (s) | SSW 15 | SSE 11 | SSE 11 | S 11 | SE 7 | SE 7 | SSW 19 | SSW 18 | SW 18 | SW 17 | SSW 16 | SSW 12 | SSW 12 | SSE 9 | SSE 8 | SE 9 | SSE 9 | SSE 9 | S 20 |
| kJ | 87 | 43 | 42 | 21 | 14 | 12 | 148 | 127 | 155 | 148 | 104 | 83 | 56 | 55 | 44 | 81 | 70 | 53 | 611 |
Swell 3 Height (m) Direction Period (s) | S 12 | SSW 10 | SSW 10 | SE 7 | SW 21 | SW 20 | SE 7 | NE 11 | SE 8 | SE 8 | SSW 18 | SSW 16 | SSE 10 | SSW 12 | SSW 12 | SSW 11 | S 11 | SSW 11 | SSE 9 |
| kJ | 46 | 18 | 18 | 14 | 115 | 98 | 13 | 29 | 17 | 15 | 102 | 100 | 37 | 83 | 45 | 23 | 62 | 40 | 50 |
Wind waves Height (m) Direction Period (s) | ENE 5 | ENE 8 | ENE 6 | ENE 5 | ENE 7 | ENE 5 | ENE 5 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
| kJ | 34 | 197 | 119 | 91 | 125 | 49 | 97 | 182 | 201 | 260 | 293 | 310 | 319 | 222 | 193 | 163 | 156 | 139 | 131 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 16 | 31 | 31 | 17 | 31 | 31 | 17 | 33 | 17 | 17 | 17 | 31 | 17 | 31 | 17 | 17 | 31 | 16 | 17 |
Best forecast wave conditions in Kaua'i | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Latest Updates
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Kalapaki Beach surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Kalapaki Beach Surf forecast
The above surf forecast table for Kalapaki Beach provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Kalapaki Beach can be found by selecting the local surf guide option on the grey menu. Our Kalapaki Beach 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 (Kalapaki Beach) 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 Kalapaki Beach 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 Kalapaki Beach, camping, hotels and condos and appartments in Kaua'i, consider staying in Nawiliwili which is 1 km (1 miles) away. Alternatively, find information about places to stay and car hire in Lihue - Kauai which is 3 km (2 miles) away
Nearest