January Weather in Marietta, United States

Last updated: June 24, 2025

In January, the average temperature in Marietta, United States hovers around 7°C (45°F). During this month, temperatures can swing from a chilling -12°C (10°F) to a warm 24°C (76°F). With an average precipitation of 113 mm (4.5 in) spread over 10 days, and humidity levels at 86%, it’s clear that this month brings a mix of weather conditions.

January Temperature in Marietta

In January in Marietta, the average temperature is 7°C (45°F), with maximums reaching 24°C (76°F) and minimums dropping as low as -12°C (10°F). Travelers should be prepared for a wide range of temperatures, from mild days to potentially frosty nights.

January Weather in Marietta: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Marietta, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Marietta, January typically has an average temperature of 7°C (45°F), with highs reaching up to 24°C (76°F) and lows dropping to around -12°C (10°F).

Data source: Temperature data for Marietta generated using information from the Copernicus Climate Change Service.

January Precipitation in Marietta

In Marietta in January, the total precipitation amount is 113 mm (4.5 in) over the course of 10 days.

January Precipitation Trends in Marietta

The chart displays monthly precipitation patterns in Marietta, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Marietta, January typically receives around 113 mm (4.5 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

January Humidity in Marietta

In Marietta in January, humidity is 86%. With an average temperature of 7°C (45°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration a bit uncomfortable and necessitating cozy layers to stay warm while navigating the moist air.

January Average Humidity in Marietta

This chart illustrates the average monthly humidity levels in Marietta, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Marietta is approximately 86%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Marietta

In Marietta in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Marietta for better planning.

Maximum UV Index Levels in Marietta for January

The chart shows the monthly maximum UV Index (UVI) for Marietta in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in Marietta typically reaches 4, which falls under the moderate exposure category.

Data source: Marietta January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How January Weather in Marietta Compares to Other Months

Weather in Marietta varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Marietta, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Marietta, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (45°F)	113 mm (4.5 inches)	86%	moderate
February Weather	10°C (50°F)	158 mm (6.2 inches)	84%	high
March Weather	13°C (56°F)	142 mm (5.6 inches)	83%	very high
April Weather	16°C (62°F)	132 mm (5.2 inches)	81%	very high
May Weather	21°C (71°F)	111 mm (4.4 inches)	81%	extreme
June Weather	24°C (76°F)	127 mm (5.0 inches)	81%	extreme
July Weather	26°C (79°F)	117 mm (4.6 inches)	83%	extreme
August Weather	26°C (78°F)	150 mm (5.9 inches)	81%	very high
September Weather	23°C (74°F)	114 mm (4.5 inches)	82%	very high
October Weather	18°C (65°F)	137 mm (5.4 inches)	78%	very high
November Weather	11°C (52°F)	85 mm (3.4 inches)	86%	high
December Weather	9°C (48°F)	142 mm (5.6 inches)	89%	moderate