September Weather in New London, United States

Last updated: June 24, 2025

In September, the average temperature in New London, United States hovers around 21°C (70°F), offering a pleasant climate. Expect a minimum of 6°C (44°F) and peaks reaching up to 35°C (95°F). During this month, you can anticipate approximately 110 mm (4.3 in) of precipitation spread over 8 days, with an average humidity level of 78%, creating a tropical ambiance.

September Temperature in New London

In September in New London, the average temperature is 21°C (70°F). Maximums can reach 35°C (95°F), while minimums can drop as low as 6°C (44°F). This varied climate makes New London an ideal destination for travelers looking to experience both warm and cool weather during their visit.

September Weather in New London: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in New London, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In New London, September typically has an average temperature of 21°C (70°F), with highs reaching up to 35°C (95°F) and lows dropping to around 6°C (44°F).

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

September Precipitation in New London

In New London in September, the precipitation amount is 110 mm (4.3 in) over a period of 8 days.

September Precipitation Trends in New London

The chart displays monthly precipitation patterns in New London, 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 New London, September typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 8 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 New London

In New London in September, humidity is 78%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that can leave travelers feeling sticky and slightly fatigued, making it important to stay hydrated and take frequent breaks from outdoor activities.

September Average Humidity in New London

This chart illustrates the average monthly humidity levels in New London, 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 New London is approximately 78%, 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 New London

In New London 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 New London.

Maximum UV Index Levels in New London for September

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

Data source: New London 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 New London Compares to Other Months

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

This table compares monthly weather conditions in New London, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	54 mm (2.1 inches)	81%	moderate
February Weather	-3°C (27°F)	59 mm (2.3 inches)	81%	moderate
March Weather	5°C (42°F)	92 mm (3.6 inches)	81%	high
April Weather	10°C (51°F)	87 mm (3.4 inches)	82%	very high
May Weather	18°C (64°F)	164 mm (6.5 inches)	78%	very high
June Weather	24°C (75°F)	145 mm (5.7 inches)	81%	extreme
July Weather	25°C (78°F)	72 mm (2.8 inches)	79%	very high
August Weather	24°C (75°F)	72 mm (2.8 inches)	77%	very high
September Weather	21°C (70°F)	110 mm (4.3 inches)	78%	very high
October Weather	13°C (55°F)	132 mm (5.2 inches)	78%	high
November Weather	4°C (40°F)	51 mm (2.0 inches)	87%	moderate
December Weather	1°C (33°F)	46 mm (1.8 inches)	84%	moderate