Hawaii County Surf Forecast for September 18, 2021
Forecast for Big Island Leeward
| Shores | Today | Sunday | ||
|---|---|---|---|---|
| Surf | Surf | |||
| AM | PM | AM | PM | |
| West Facing | 1-3 | 1-3 | 1-3 | 1-3 |
| South Facing | 2-4 | 2-4 | 2-4 | 2-4 |
| Weather | Mostly sunny. Scattered showers. |
|---|---|
| High Temperature | In the mid 80s. |
| Winds | Northeast winds around 5 mph, becoming west in the afternoon. |
| Sunrise | 6:13 AM HST. |
| Sunset | 6:23 PM HST. |
Swell Summary
Medium period background southwest to south swells will hold surf along the south facing shores to slightly below normal summertime averages into early next week. Small, long period south swell energy originating from recent Southern Hemispheric gales southeast of New Zealand is timed to arrive around mid week. These swells may bump surf back up to near summertime averages during the second half of the week.
A small, medium period northwest swell is expected to reach the northwest islands later today and travel through the chain Sunday. These swells will lift north and west facing shore surf from near flat to possibly chest high Sunday. A series of slightly larger, medium period northwest swells emanating from a couple of eastern passing North Pacific gale lows will come across the islands next week.
A few days of fresh trades over and upstream of the region will support choppy wind waves along most eastern exposures through the middle of next week.
NORTH EAST
am 
pm 
Surf: Knee to waist high ENE short period wind swell with occasional stomach high sets.
Conditions: Semi glassy in the morning with SSE winds 5-10mph. Semi choppy conditions for the afternoon with the winds shifting ESE 10-15mph.
NORTH WEST
am 
pm 
Surf: Minimal (ankle high or less) surf.
Conditions: Glassy in the morning with SSW winds less than 5mph. Sideshore texture/chop conditions for the afternoon with the winds shifting SW 10-15mph.
WEST
am 
pm
Surf: Minimal (ankle high or less) surf.
Conditions: Semi glassy in the morning with N winds less than 5mph. Semi glassy/semi bumpy conditions for the afternoon with the winds shifting SW 5-10mph. Glassy conditions are expected for the late day with WSW winds less than 5mph.
SOUTH EAST
am pm 
Surf: Knee high E short period wind swell in the morning builds to knee to waist high for the afternoon.
Conditions: Light sideshore texture in the morning with NNE winds 5-10mph. Sideshore texture/chop conditions for the afternoon with the winds shifting NE 10-15mph.
Data Courtesy of NOAA.gov and SwellInfo.com
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