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September Weather in New London, United States

Last updated: June 24, 2025

In September, the average temperature in New London, United States is a pleasant 17°C (62°F). However, be prepared for the extremes, as temperatures can dip to 0°C (33°F) or soar up to 32°C (91°F). Expect some rain too, with an average precipitation of 79 mm (3.1 in) spread over 10 days. With an average humidity of 78%, it's wise to keep your umbrella handy!

September Temperature in New London

In September in New London, the average temperature is 17°C (62°F). Maximums can reach 32°C (91°F) and minimums can be as low as 0°C (33°F). This variation makes it essential for travelers to pack layers to accommodate both warm and cool conditions.

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 17°C (62°F), with highs reaching up to 32°C (91°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec191933435768736962493425
Data source: Temperature data for New London generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in New London

In New London in September, the precipitation amount is 79 mm (3.1 in) over a span of 10 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 79 mm (3.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec394961102109104116114791025155
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in New London

In New London in September, humidity is 78%. With an average temperature of 17°C (62°F), this humidity feels like a warm, enveloping blanket, making travel feel a bit sticky and heavy but also refreshing, as long as you're prepared with light clothing and plenty of water.

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.
JanFebMarAprMayJunJulAugSepOctNovDec89%90%87%84%77%75%75%73%78%84%89%87%
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 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check 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 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34589101097532
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.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)39 mm (1.5 inches)89%moderate
February Weather-7°C (20°F)49 mm (1.9 inches)90%moderate
March Weather0°C (33°F)61 mm (2.4 inches)87%moderate
April Weather6°C (43°F)102 mm (4.0 inches)84%very high
May Weather14°C (57°F)109 mm (4.3 inches)77%very high
June Weather20°C (69°F)104 mm (4.1 inches)75%very high
July Weather23°C (73°F)115 mm (4.5 inches)74%very high
August Weather21°C (70°F)114 mm (4.5 inches)73%very high
September Weather17°C (62°F)79 mm (3.1 inches)78%high
October Weather9°C (49°F)101 mm (4.0 inches)84%moderate
November Weather1°C (35°F)51 mm (2.0 inches)89%moderate
December Weather-4°C (26°F)55 mm (2.2 inches)87%low

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