January Weather in Newark, United States

Last updated: June 24, 2025

In Newark, United States, the average temperature in January hovers around 4°C (40°F), with extremes ranging from a chilling -14°C (7°F) to a pleasant 22°C (72°F). During this time, you can expect 86 mm (3.4 in) of precipitation spread over about 8 days, contributing to an average humidity level of 84%. Whether it’s a rainy day or a sunny one, be prepared for a mix of weather!

January Temperature in Newark

In January in Newark, the average temperature is 4°C (40°F), with maximums reaching 22°C (72°F) and minimums dropping as low as -14°C (7°F). This range makes it essential for travelers to pack layers to stay comfortable during their visit.

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

The chart illustrates January temperature patterns in Newark, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Newark, January typically has an average temperature of 4°C (40°F), with highs reaching up to 22°C (72°F) and lows dropping to around -14°C (7°F).

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

January Precipitation in Newark

In Newark in January, the precipitation amount reaches 86 mm (3.4 in) over the course of 8 days.

January Precipitation Trends in Newark

The chart displays monthly precipitation patterns in Newark, 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 Newark, January typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 8 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Newark

In Newark in January, humidity is 84%. With an average temperature of 4°C (40°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and requiring extra layers to stay warm and dry while traveling.

January Average Humidity in Newark

This chart illustrates the average monthly humidity levels in Newark, 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 Newark is approximately 84%, 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 Newark

In Newark in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Newark, you can check the information here.

Maximum UV Index Levels in Newark for January

The chart shows the monthly maximum UV Index (UVI) for Newark 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 Newark typically reaches 3, which falls under the moderate exposure category.

Data source: Newark 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 Newark Compares to Other Months

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

This table compares monthly weather conditions in Newark, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	86 mm (3.4 inches)	84%	moderate
February Weather	6°C (43°F)	142 mm (5.6 inches)	83%	high
March Weather	12°C (53°F)	147 mm (5.8 inches)	81%	very high
April Weather	15°C (60°F)	157 mm (6.2 inches)	81%	very high
May Weather	21°C (70°F)	160 mm (6.3 inches)	83%	extreme
June Weather	25°C (78°F)	87 mm (3.4 inches)	83%	extreme
July Weather	27°C (82°F)	103 mm (4.0 inches)	81%	extreme
August Weather	26°C (79°F)	119 mm (4.7 inches)	74%	very high
September Weather	24°C (75°F)	85 mm (3.4 inches)	71%	very high
October Weather	17°C (63°F)	112 mm (4.4 inches)	76%	high
November Weather	9°C (49°F)	76 mm (3.0 inches)	84%	moderate
December Weather	7°C (45°F)	102 mm (4.0 inches)	88%	moderate