The highest day temperature in January 2026 was 69°F. The lowest night temperature was 11°F. The average values for day and night temperatures during January were 46.8°F и 37.1°F respectivly.

You can expect various weather conditions during January. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in January for Marietta is 1.6 in.

The average wind speed in January is 7.5 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Marietta in January is 5.5 hours.