Weather for Mellenville, NY - Mellenville, NY Weather, Current Weather in Mellenville, NY. Local weather report for Mellenville, NY, Local Mellenville, NY weather. Forecast for Mellenville, New York, Mellenville, NY weather forecast. Find your local Mellenville weather forecast. Mellenville, NY weather conditions. Weather outlook for Mellenville, NY. Weather report for Mellenville, NY. Weather Maps and Driving Directions Maps. Mellenville Weather - Weather Mellenville.