Low 37F. The time period when the sun is no more than 6 degrees below the horizon at either sunrise or sunset. Hourly Weather Forecast. The horizon should be clearly defined and the brightest stars should be visible under good atmospheric conditions (i.e. The Long-range 12 day forecast also includes detail for Duluth (Georgia) weather today. Winds light and variable. Low; Thu 11/19: Plenty of sunshine: 14° 4° Fri 11/20: Sunny and pleasant All Rights Reserved. Duluth, GA traffic conditions and updates are included - as well as any NWS alerts, warnings, and advisories for the Duluth area and overall Gwinnett county, Georgia. no moonlight, or other lights). The time period when the sun is between 12 and 18 degrees below the horizon at either sunrise or sunset.