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Swell Matrix
Northwestern Hawaii
Graphical Wave Forecast
Show Surf Height:
Show swell less than 1 foot:
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Tue Apr 01
Wed Apr 02
Thu Apr 03
Fri Apr 04
Sat Apr 05
Sun Apr 06
Mon Apr 07
Tue Apr 08
Wed Apr 09
Thu Apr 10
Fri Apr 11
Sat Apr 12
Sun Apr 13
Mon Apr 14
Tue Apr 15
Wed Apr 16
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Swell Height (feet)
Day of Week, AM / PM
Multiple swell forecast for Tue Apr 08: Swell 1: Height: 1.37 feet Period: 16.7 seconds Direction: 193 degrees Swell 2: Height: 1.52 feet Period: 16 seconds Direction: 192 degrees Swell 3: Height: 4.21 feet Period: 11.8 seconds Direction: 346 degrees Swell 4: Height: 2.3 feet Period: 11.8 seconds Direction: 322 degrees Swell 5: Height: 3.29 feet Period: 11.4 seconds Direction: 348 degrees Swell 6: Height: 5.33 feet Period: 7.3 seconds Direction: 92 degrees Swell 7: Height: 5.34 feet Period: 7.2 seconds Direction: 93 degrees... Wed Apr 16: Swell 1: Height: 1.67 feet Period: 16.7 seconds Direction: 304 degrees Swell 2: Height: 1.67 feet Period: 16.7 seconds Direction: 304 degrees Swell 3: Height: 2.03 feet Period: 16.1 seconds Direction: 304 degrees Swell 4: Height: 1.04 feet Period: 14 seconds Direction: 209 degrees Swell 5: Height: 1.07 feet Period: 13.8 seconds Direction: 209 degrees Swell 6: Height: 1.07 feet Period: 13.8 seconds Direction: 209 degrees Swell 7: Height: 1.61 feet Period: 9.8 seconds Direction: 324 degrees Swell 8: Height: 1.61 feet Period: 9.8 seconds Direction: 324 degrees Swell 9: Height: 1.61 feet Period: 9.8 seconds Direction: 324 degrees Swell 10: Height: 1.56 feet Period: 9.6 seconds Direction: 325 degrees Swell 11: Height: 6.81 feet Period: 8.6 seconds Direction: 100 degrees Swell 12: Height: 6.22 feet Period: 8.6 seconds Direction: 103 degrees... Wed Apr 02: Swell 1: Height: 1.48 feet Period: 11.4 seconds Direction: 322 degrees Swell 2: Height: 1.48 feet Period: 11.4 seconds Direction: 322 degrees Swell 3: Height: 1.88 feet Period: 10.2 seconds Direction: 354 degrees Swell 4: Height: 1.87 feet Period: 10 seconds Direction: 352 degrees Swell 5: Height: 1.87 feet Period: 10 seconds Direction: 352 degrees Swell 6: Height: 1.87 feet Period: 10 seconds Direction: 352 degrees Swell 7: Height: 5.18 feet Period: 9.3 seconds Direction: 291 degrees Swell 8: Height: 5.18 feet Period: 9.3 seconds Direction: 291 degrees Swell 9: Height: 5.04 feet Period: 9 seconds Direction: 293 degrees Swell 10: Height: 5.04 feet Period: 9 seconds Direction: 293 degrees Swell 11: Height: 1.94 feet Period: 8.8 seconds Direction: 119 degrees Swell 12: Height: 1.94 feet Period: 8.8 seconds Direction: 119 degrees Swell 13: Height: 1.94 feet Period: 8.8 seconds Direction: 119 degrees Swell 14: Height: 1.94 feet Period: 8.8 seconds Direction: 119 degrees Swell 15: Height: 1.51 feet Period: 7.5 seconds Direction: 112 degrees Swell 16: Height: 1.51 feet Period: 7.5 seconds Direction: 112 degrees Swell 17: Height: 5.02 feet Period: 6.4 seconds Direction: 203 degrees Swell 18: Height: 5.02 feet Period: 6.4 seconds Direction: 203 degrees Swell 19: Height: 2.23 feet Period: 6.3 seconds Direction: 156 degrees Swell 20: Height: 2.23 feet Period: 6.3 seconds Direction: 156 degrees Swell 21: Height: 2.62 feet Period: 6 seconds Direction: 213 degrees Swell 22: Height: 2.62 feet Period: 6 seconds Direction: 213 degrees Swell 23: Height: 2.62 feet Period: 6 seconds Direction: 213 degrees... Thu Apr 03: Swell 1: Height: 6.53 feet Period: 10.7 seconds Direction: 329 degrees Swell 2: Height: 6.57 feet Period: 10.4 seconds Direction: 320 degrees Swell 3: Height: 6.57 feet Period: 10.4 seconds Direction: 320 degrees Swell 4: Height: 2.17 feet Period: 8.4 seconds Direction: 130 degrees Swell 5: Height: 2.26 feet Period: 8.3 seconds Direction: 133 degrees Swell 6: Height: 2.26 feet Period: 8.3 seconds Direction: 133 degrees... Sat Apr 05: Swell 1: Height: 11.25 feet Period: 15.3 seconds Direction: 350 degrees Swell 2: Height: 11.25 feet Period: 15.3 seconds Direction: 350 degrees Swell 3: Height: 11.25 feet Period: 15.3 seconds Direction: 350 degrees Swell 4: Height: 11.28 feet Period: 14.7 seconds Direction: 350 degrees Swell 5: Height: 1.44 feet Period: 8.1 seconds Direction: 116 degrees Swell 6: Height: 5 feet Period: 5.9 seconds Direction: 79 degrees Swell 7: Height: 4.66 feet Period: 5.6 seconds Direction: 76 degrees Swell 8: Height: 4.66 feet Period: 5.6 seconds Direction: 76 degrees Swell 9: Height: 4.66 feet Period: 5.6 seconds Direction: 76 degrees... Sun Apr 06: Swell 1: Height: 9.3 feet Period: 13.9 seconds Direction: 352 degrees Swell 2: Height: 8.19 feet Period: 13.6 seconds Direction: 353 degrees Swell 3: Height: 6.23 feet Period: 7.3 seconds Direction: 85 degrees Swell 4: Height: 6.12 feet Period: 7 seconds Direction: 82 degrees... Mon Apr 07: Swell 1: Height: 6.13 feet Period: 12.8 seconds Direction: 354 degrees Swell 2: Height: 5.62 feet Period: 12.7 seconds Direction: 353 degrees Swell 3: Height: 5.94 feet Period: 7.4 seconds Direction: 90 degrees Swell 4: Height: 6.62 feet Period: 7.3 seconds Direction: 85 degrees... Wed Apr 09: Swell 1: Height: 1.52 feet Period: 15 seconds Direction: 193 degrees Swell 2: Height: 1.52 feet Period: 15 seconds Direction: 193 degrees Swell 3: Height: 1.67 feet Period: 14.6 seconds Direction: 192 degrees Swell 4: Height: 1.67 feet Period: 14.5 seconds Direction: 192 degrees Swell 5: Height: 1.67 feet Period: 14.5 seconds Direction: 192 degrees Swell 6: Height: 1.67 feet Period: 14.5 seconds Direction: 192 degrees Swell 7: Height: 1.25 feet Period: 14.3 seconds Direction: 325 degrees Swell 8: Height: 1.25 feet Period: 14.3 seconds Direction: 325 degrees Swell 9: Height: 3.59 feet Period: 13.8 seconds Direction: 327 degrees Swell 10: Height: 3.59 feet Period: 13.8 seconds Direction: 327 degrees Swell 11: Height: 1.63 feet Period: 10.7 seconds Direction: 351 degrees Swell 12: Height: 1.63 feet Period: 10.7 seconds Direction: 351 degrees Swell 13: Height: 2.61 feet Period: 10.7 seconds Direction: 326 degrees Swell 14: Height: 4.41 feet Period: 8.1 seconds Direction: 91 degrees Swell 15: Height: 4.86 feet Period: 7.4 seconds Direction: 92 degrees... Thu Apr 10: Swell 1: Height: 1.48 feet Period: 13.9 seconds Direction: 192 degrees Swell 2: Height: 1.38 feet Period: 13.5 seconds Direction: 192 degrees Swell 3: Height: 4.58 feet Period: 12.1 seconds Direction: 327 degrees Swell 4: Height: 4.01 feet Period: 11.6 seconds Direction: 328 degrees Swell 5: Height: 6.49 feet Period: 6.9 seconds Direction: 76 degrees Swell 6: Height: 6.32 feet Period: 6.6 seconds Direction: 71 degrees... Fri Apr 11: Swell 1: Height: 1.18 feet Period: 12.9 seconds Direction: 190 degrees Swell 2: Height: 1.1 feet Period: 12.6 seconds Direction: 189 degrees Swell 3: Height: 2.54 feet Period: 10.8 seconds Direction: 326 degrees Swell 4: Height: 2.26 feet Period: 10.4 seconds Direction: 332 degrees Swell 5: Height: 7.33 feet Period: 7.8 seconds Direction: 83 degrees Swell 6: Height: 7.97 feet Period: 7.7 seconds Direction: 80 degrees... Sat Apr 12: Swell 1: Height: 2.27 feet Period: 10.1 seconds Direction: 348 degrees Swell 2: Height: 2.05 feet Period: 9.7 seconds Direction: 352 degrees Swell 3: Height: 7.77 feet Period: 8.3 seconds Direction: 93 degrees Swell 4: Height: 7.61 feet Period: 8 seconds Direction: 92 degrees... Sun Apr 13: Swell 1: Height: 1.03 feet Period: 14.2 seconds Direction: 195 degrees Swell 2: Height: 1.03 feet Period: 14.2 seconds Direction: 195 degrees Swell 3: Height: 1.31 feet Period: 11.5 seconds Direction: 306 degrees Swell 4: Height: 1.31 feet Period: 11.5 seconds Direction: 306 degrees Swell 5: Height: 1.46 feet Period: 9.1 seconds Direction: 358 degrees Swell 6: Height: 1.18 feet Period: 8.8 seconds Direction: 1 degrees Swell 7: Height: 1.18 feet Period: 8.8 seconds Direction: 1 degrees Swell 8: Height: 7.4 feet Period: 8.1 seconds Direction: 92 degrees Swell 9: Height: 7.29 feet Period: 8 seconds Direction: 96 degrees... Mon Apr 14: Swell 1: Height: 2.46 feet Period: 10.7 seconds Direction: 307 degrees Swell 2: Height: 2.43 feet Period: 10.1 seconds Direction: 309 degrees Swell 3: Height: 1.17 feet Period: 8.6 seconds Direction: 5 degrees Swell 4: Height: 7 feet Period: 8.1 seconds Direction: 93 degrees Swell 5: Height: 6.64 feet Period: 7.9 seconds Direction: 92 degrees... Tue Apr 15: Swell 1: Height: 1.03 feet Period: 14.7 seconds Direction: 210 degrees Swell 2: Height: 1.05 feet Period: 14.4 seconds Direction: 210 degrees Swell 3: Height: 1.05 feet Period: 14.4 seconds Direction: 210 degrees Swell 4: Height: 1.45 feet Period: 10.8 seconds Direction: 318 degrees Swell 5: Height: 1.45 feet Period: 10.8 seconds Direction: 318 degrees Swell 6: Height: 1.18 feet Period: 10.5 seconds Direction: 319 degrees Swell 7: Height: 1.18 feet Period: 10.5 seconds Direction: 319 degrees Swell 8: Height: 1.18 feet Period: 10.5 seconds Direction: 319 degrees Swell 9: Height: 1.21 feet Period: 8.7 seconds Direction: 314 degrees Swell 10: Height: 1.21 feet Period: 8.7 seconds Direction: 314 degrees Swell 11: Height: 6.78 feet Period: 8.3 seconds Direction: 94 degrees Swell 12: Height: 7.13 feet Period: 8.2 seconds Direction: 95 degrees... Tue Apr 01: Swell 1: Height: 1.17 feet Period: 14.5 seconds Direction: 192 degrees Swell 2: Height: 2.81 feet Period: 11.1 seconds Direction: 6 degrees Swell 3: Height: 2.23 feet Period: 10.7 seconds Direction: 360 degrees Swell 4: Height: 2.23 feet Period: 10.7 seconds Direction: 360 degrees Swell 5: Height: 2.23 feet Period: 10.7 seconds Direction: 360 degrees Swell 6: Height: 4.67 feet Period: 9.5 seconds Direction: 288 degrees Swell 7: Height: 4.67 feet Period: 9.5 seconds Direction: 288 degrees Swell 8: Height: 6.06 feet Period: 9.4 seconds Direction: 272 degrees Swell 9: Height: 6.06 feet Period: 9.4 seconds Direction: 272 degrees Swell 10: Height: 7.46 feet Period: 6.5 seconds Direction: 195 degrees Swell 11: Height: 7.46 feet Period: 6.5 seconds Direction: 195 degrees Swell 12: Height: 7.46 feet Period: 6.5 seconds Direction: 195 degrees Swell 13: Height: 5.26 feet Period: 6.1 seconds Direction: 181 degrees Swell 14: Height: 5.26 feet Period: 6.1 seconds Direction: 181 degrees... Fri Apr 04: Swell 1: Height: 1.07 feet Period: 14.4 seconds Direction: 195 degrees Swell 2: Height: 1 feet Period: 14.2 seconds Direction: 196 degrees Swell 3: Height: 8.34 feet Period: 12.1 seconds Direction: 339 degrees Swell 4: Height: 8 feet Period: 11.8 seconds Direction: 343 degrees Swell 5: Height: 1.77 feet Period: 8.3 seconds Direction: 123 degrees Swell 6: Height: 1.64 feet Period: 8.3 seconds Direction: 121 degrees...
Instructions
Circle size corresponds to wave period length.
For a given swell height, a longer-period wave will break into larger surf than a short period wave
.
Hover or tap a circle for detailed swell train information
Circle color indicates the direction the swell is coming from
The line indicates estimated surf height. It assumes swell hitting the shore at a 90 degree angle at a well exposed-spot.
On small screens, swipe or scroll horizontally to see all the days in the forecast
Surf Height Calculator:
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Data run: 2025-04-01_06_51101