Hawaii County Surf Forecast for December 18, 2025
Forecast for Big Island Windward and Southeast
| Shores | Tonight | Thursday | ||
|---|---|---|---|---|
| Surf | Surf | |||
| PM | AM | AM | PM | |
| North Facing | 7-10 | 5-7 | 5-7 | 7-10 |
| East Facing | 2-4 | 2-4 | 2-4 | 1-3 |
| South Facing | 2-4 | 2-4 | 2-4 | 1-3 |
| Weather | Mostly clear. Scattered showers. | |||||
|---|---|---|---|---|---|---|
| Low Temperature | In the upper 60s. | |||||
| Winds | South winds 10 to 15 mph, becoming southwest around 5 mph after midnight. |
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| Weather | Mostly sunny. Scattered showers. | |||||
|---|---|---|---|---|---|---|
| High Temperature | In the lower 80s. | |||||
| Winds | South winds around 5 mph, increasing to southeast around 15 mph in the afternoon. |
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| Sunrise | 6:48 AM HST. | |||||
| Sunset | 5:45 PM HST. | |||||
Forecast for Big Island Leeward
| Shores | Tonight | Thursday | ||
|---|---|---|---|---|
| Surf | Surf | |||
| PM | AM | AM | PM | |
| West Facing | 3-5 | 3-5 | 3-5 | 5-7 |
| South Facing | 2-4 | 3-5 | 3-5 | 5-7 |
Swell Summary
A moderate to large, medium period WNW swell (280 to 320 degrees) and NW swell have come in above guidance and will hold through the rest of the afternoon before decreasing late tonight. Then a slightly larger, medium period NNW (330-350 degree) swell will fill in early Thursday morning and peak Thursday afternoon right around advisory levels. These swells will keep advisory level surf in place for north and west shores through Thursday and will gradually decline Friday. By Saturday morning, a N swell looks to move in and peak at around advisory levels, then gradually decrease Sunday through early next week.
E shore surf will remain small except where NW-N swell energy wraps through the rest of the week. By next week, a large, short period NE swell could elevate surf along E facing shores as strong trade winds return. Current model discrepancies highlight uncertainty in the timing of the higher E surf, with some models showing large surf by Tuesday, while others Wednesday. S shore surf will remain choppy as persistent S-SW winds hold through today, before gradually easing through the rest of week. Small background SW swells will keep surf from going flat through the weekend.
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 early morning with ESE winds less than 5mph. Bumpy/semi bumpy conditions move in during the morning hours with the winds shifting W 5-10mph.
WEST
am 
pm
Surf: Minimal (ankle high or less) surf.
Conditions: Semi glassy in the morning with N winds less than 5mph. Bumpy/semi bumpy conditions for the afternoon with the winds shifting WNW 5-10mph.
SOUTH EAST
am pm
Surf: Minimal (ankle high or less) surf.
Conditions: Light sideshore texture in the morning with NE winds 10-15mph. This becomes Sideshore texture/chop for the afternoon.
Data Courtesy of NOAA.gov and SwellInfo.com
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