Hawaii County Surf Forecast for May 18, 2026
Forecast for Big Island Windward and Southeast
| Shores | Tonight | Monday | ||
|---|---|---|---|---|
| Surf | Surf | |||
| PM | AM | AM | PM | |
| North Facing | 1-3 | 1-3 | 1-3 | 1-3 |
| East Facing | 3-5 | 3-5 | 3-5 | 3-5 |
| South Facing | 4-6 | 4-6 | 4-6 | 4-6 |
| Weather | Mostly cloudy. Numerous showers. | ||||||
|---|---|---|---|---|---|---|---|
| Low Temperature | In the lower 70s. | ||||||
| Winds | Northeast winds 5 to 10 mph, becoming northwest after midnight. |
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| Weather | Partly sunny. Numerous showers. | |||||
|---|---|---|---|---|---|---|
| High Temperature | In the lower 80s. | |||||
| Winds | Northeast winds around 5 mph. | |||||
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| Sunrise | 5:43 AM HST. | |||||
| Sunset | 6:50 PM HST. | |||||
Forecast for Big Island Leeward
| Shores | Tonight | Monday | ||
|---|---|---|---|---|
| Surf | Surf | |||
| PM | AM | AM | PM | |
| West Facing | 1-3 | 1-3 | 2-4 | 2-4 |
| South Facing | 4-6 | 4-6 | 4-6 | 4-6 |
| Weather | Mostly cloudy until 12 AM, then mostly clear. Hazy. Scattered showers. |
|---|---|
| Low Temperature | In the upper 60s. |
| Winds | Southwest winds around 5 mph in the afternoon and evening, becoming light and variable. |
| Weather | Sunny until 12 PM, then mostly cloudy. Scattered showers. |
|---|---|
| High Temperature | In the upper 80s. |
| Winds | West winds around 5 mph. |
| Sunrise | 5:47 AM HST. |
| Sunset | 6:54 PM HST. |
Swell Summary
A small, medium-period NNW declines through tonight with surf along exposed shorelines following suit. Another medium period NNW swell will provide an additional in surf along N shores by early tomorrow morning. This will then be followed by another similarly sized pulse on Tuesday. Surf along W shores remains steady as NNW swell declines in favor a new long period SSW swell.
A mix of small medium to long period S swells maintains small surf along S facing shores for the next several days. The aforementioned long period SSW swell will favor increased surf along S facing shores through today. Additional medium to long period S swell arrive through the week. Meanwhile, trades maintain choppy short period surf and fresh easterly swell through the week.
NORTH EAST
am 
pm
Surf: Minimal (ankle high or less) surf.
Conditions: Semi choppy with ESE winds 5-10mph in the morning increasing to 10-15mph in the afternoon.
NORTH WEST
am 
pm
Surf: Minimal (ankle high or less) surf.
Conditions: Clean in the morning with ESE winds less than 5mph. Bumpy/semi bumpy conditions for the afternoon with the winds shifting W 5-10mph.
WEST
am 
pm
Surf: Minimal (ankle high or less) surf.
Conditions: Light sideshore texture in the morning with NNW winds 5-10mph. Bumpy/semi bumpy conditions for the afternoon with the winds shifting to the WNW.
SOUTH EAST
am pm
Surf: Minimal (ankle high or less) surf.
Conditions: Sideshore texture/chop with NE winds 10-15mph.
Data Courtesy of NOAA.gov and SwellInfo.com
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