Hawaii County Surf Forecast for May 18, 2021
Forecast for Big Island Leeward
| Shores | Today | Wednesday | ||
|---|---|---|---|---|
| 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 lower 80s. |
| Winds | South winds around 5 mph, becoming southwest in the afternoon. |
| Sunrise | 5:47 AM HST. |
| Sunset | 6:54 PM HST. |
| Weather | Mostly cloudy until 12 AM, then partly cloudy. Scattered showers. |
|---|---|
| Low Temperature | In the upper 60s. |
| Winds | South winds around 5 mph, becoming north after midnight. |
| Weather | Mostly sunny until 12 PM, then mostly cloudy. Scattered showers. |
|---|---|
| High Temperature | In the lower 80s. |
| Winds | Southwest winds around 5 mph, becoming northwest in the afternoon. |
| Sunrise | 5:47 AM HST. |
| Sunset | 6:55 PM HST. |
Swell Summary
Slightly higher surf is expected along northern and western coasts through Wednesday as a couple of late season small north to west swells pass around the islands. Today's swell is more northwest at 330 degrees and will peak surf at below normal heights. A secondary more west northwest small swell arrives tonight into Wednesday. This swell will hold north facing surf up but may also be just enough north at near 300 degrees to avoid upstream island shadowing and provide a small bump to west facing Kauai and Oahu shore surf Wednesday.
Several days of enhanced trades has created fully developed seas. Thus, choppy conditions along east facing shores will occur throughout the week.
South facing shore surf will stay small, or slightly below season norms, the next several days. In the long range, a slightly larger, long period pulse from the southern hemisphere may arrive early next week. This swell may boost late May southern coast surf to near typical summertime heights.
NORTH EAST
am 
pm 
Surf: Knee high ENE short period wind swell in the morning builds to knee to waist high for the afternoon.
Conditions: Semi clean/textured in the morning with S winds 10-15mph. Choppy/sideshore current conditions for the afternoon with the winds shifting SE 15-20mph.
NORTH WEST
am 
pm 
Surf: Minimal (ankle high or less) surf.
Conditions: Clean in the early morning with SE winds less than 5mph. Semi choppy conditions move in during the morning hours with the winds shifting WSW 5-10mph.
WEST
am pm
Surf: Minimal (ankle high or less) surf.
Conditions: Glassy in the morning with SE winds less than 5mph. Semi glassy/semi bumpy conditions for the afternoon with the winds shifting SW 5-10mph.
SOUTH EAST
am pm
Surf: Knee high E short period wind swell in the morning builds in the afternoon with occasional sets up to waist high.
Conditions: Clean in the morning with NNW winds 5-10mph. Semi choppy conditions for the afternoon with the winds shifting to the ENE.
Data Courtesy of NOAA.gov and SwellInfo.com
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