July 20, 2018 Surf Forecast

July 20, 2018, 5:00 AM HST
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Photo: James Grenz

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Swell Summary

Outlook through Friday July 27: Reinforcing south-southwest swells today and tonight, producing surf heights slightly above the summer average for the south facing shores. A larger and longer period south- southwest swell is expected to begin filling in Saturday and peak on Sunday. This swell may cause surf to approach the High Surf Advisory threshold along south facing shores from Saturday into Monday. No other significant swells are expected.
Surf heights are forecast heights of the face, or front, of waves. The surf forecast is based on the significant wave height, the average height of the one third largest waves, at the locations of the largest breakers. Some waves may be more than twice as high as the significant wave height. Expect to encounter rip currents in or near any surf zone.

North East


am        pm  


Surf: Waist to stomach high E wind swell with occasional chest high sets.

Conditions: Fairly clean in the morning with S winds 5-10mph. Semi choppy conditions for the afternoon with the winds shifting to the ESE.

North West


am        pm  

Surf: Knee high SSW long period swell for the morning going more SW during the day.

Conditions: Glassy in the early morning with S winds less than 5mph. Sideshore texture/chop conditions move in during the morning hours with the winds shifting SW 10-15mph.


am        pm  

Surf: Knee to waist high SSW ground swell for the morning with occasional stomach high sets. This builds in the afternoon with sets up to chest high.

Conditions: Semi glassy in the morning with SSE winds less than 5mph. Bumpy/semi bumpy conditions for the afternoon with the winds shifting W 5-10mph.

South East

am        pm  

Surf: Waist to chest high E extra long period swell with occasional shoulder sets. This rotates more from the S during the afternoon.

Conditions: Light sideshore texture with NNE winds 5-10mph in the morning increasing to 10-15mph in the afternoon.

Image: NOAA

Image: NOAA

Image: NOAA

Image: NOAA

Image: NOAA

**Click directly on the images below to make them larger. Charts include: Hawaii County projected winds, tides, swell direction & period and expected wave heights.**


Data Courtesy of and

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