Weather for Hanthorn Lake, IA - Hanthorn Lake, IA Weather, Current Weather in Hanthorn Lake, IA. Local weather report for Hanthorn Lake, IA, Local Hanthorn Lake, IA weather. Forecast for Hanthorn Lake, Iowa, Hanthorn Lake, IA weather forecast. Find your local Hanthorn Lake weather forecast. Hanthorn Lake, IA weather conditions.