Forecast for Big Island Windward and SoutheastShores Tonight Monday Surf Surf PM AM AM PM North Facing 0-2 0-2 0-2 0-2 East Facing 3-5 3-5 3-5 3-5 South Facing 3-5 3-5 4-6 4-6TONIGHT Weather Mostly cloudy. Forecast for Big Island LeewardShores Tonight Monday Surf Surf PM AM AM PM West Facing 2-4 2-4 3-5 3-5 South Facing 3-5 3-5 4-6 4-6TONIGHT Weather Partly sunny until 6 PM, then partlycloudy. Tides Kona Low -0.2 feet 07:27 AM HST. Swell SummarySurf along south facing shores will remain near the August average through Monday as overlapping south swells impact the islands. A larger moderate long period south swell is expected to fill in Wednesday and remain elevated through Friday prompting the potential for a High Surf Advisory at its peak.