September Weather in Newark, United States

Last updated: June 24, 2025

In Newark, United States, the average temperature in September hovers around 21°C (71°F). Expect a range that can dip to a cool 7°C (44°F) and soar to a warm 34°C (93°F). During this month, precipitation averages 105 mm (4.1 in) across 11 days, with an average humidity of 75%.

September Temperature in Newark

In September in Newark, the average temperature is 21°C (71°F), with maximums reaching up to 34°C (93°F) and minimums dipping as low as 7°C (44°F). This makes Newark an ideal destination for travelers looking to enjoy mild to warm weather during this time of year.

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

The chart illustrates September 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, September typically has an average temperature of 21°C (71°F), with highs reaching up to 34°C (93°F) and lows dropping to around 7°C (44°F).

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

September Precipitation in Newark

In Newark in September, the precipitation amount is 105 mm (4.1 in) over the course of 11 days.

September Precipitation Trends in Newark

The chart displays monthly precipitation patterns in Newark, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Newark, September typically receives around 105 mm (4.1 inches) of precipitation spread over approximately 11 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Newark

In Newark in September, humidity is 75%. With an average temperature of 21°C (71°F), this humidity feels like a warm blanket wrapping around you, making travel slightly uncomfortable but offering a lush, vibrant atmosphere that invites exploration at a leisurely pace.

September Average Humidity in Newark

This chart illustrates the average monthly humidity levels in Newark, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Newark is approximately 75%, offering insight into how humid the weather typically is during this month.

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

September UV Index in Newark

In Newark in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Newark.

Maximum UV Index Levels in Newark for September

The chart shows the monthly maximum UV Index (UVI) for Newark in September, 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 September, the maximum UV index in Newark typically reaches 8, which falls under the very high exposure category.

Data source: Newark September 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 September 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 September’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 September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	66 mm (2.6 inches)	84%	moderate
February Weather	4°C (39°F)	104 mm (4.1 inches)	83%	moderate
March Weather	7°C (44°F)	104 mm (4.1 inches)	83%	high
April Weather	13°C (55°F)	107 mm (4.2 inches)	81%	very high
May Weather	18°C (64°F)	136 mm (5.4 inches)	78%	very high
June Weather	23°C (74°F)	113 mm (4.5 inches)	79%	very high
July Weather	26°C (79°F)	137 mm (5.4 inches)	74%	very high
August Weather	25°C (77°F)	137 mm (5.4 inches)	72%	very high
September Weather	21°C (71°F)	105 mm (4.1 inches)	75%	very high
October Weather	16°C (61°F)	106 mm (4.2 inches)	81%	high
November Weather	8°C (47°F)	85 mm (3.3 inches)	85%	moderate
December Weather	4°C (40°F)	102 mm (4.0 inches)	84%	moderate