Marietta (GA) Weather & Climate: Best Time to Visit

The climate in Marietta is known for significant temperature differences throughout the year, making the weather dynamic. On average, daytime temperatures range from a very warm 31°C (88°F) in July to a chilly 11°C (52°F) in January.

Nighttime temperatures range from 21°C (70°F) in July to -1°C (30°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Marietta has a notably wet climate with abundant precipitation, recording 1197 mm (47 in) of rain/snowfall per year. The wettest period in Marietta occurs in December, which receives around 137 mm (5.4 in) of precipitation. During the driest month, September, Marietta experiences moderate rainfall, totaling 87 mm (3.4 in). The consistent precipitation levels throughout the year contribute to a relatively stable climate. For more details, please visit our Marietta Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

In Marietta, summer days are longer and more sunny, with daily sunshine hours peaking at 9.6 hours in May. As the darker season arrives, the brightness of the sun becomes less. January sees a soft sun for only 5.5 hours per average day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Marietta.

The city experiences its highest humidity in August, reaching 75%. In April, the humidity drops to its lowest level at 61%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year