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September Weather in New London, United States

Last updated: June 24, 2025

The average temperature in New London, United States during September hovers around 26°C (80°F), making it a delightful time to visit. However, be prepared for a temperature range that can dip to a brisk 11°C (52°F) and soar up to a scorching 39°C (102°F). Expect some rain with an average precipitation amount of 89 mm (3.5 in) over 9 days, and keep in mind the average humidity is around 65%. Embrace the diversity of weather as you explore!

September Temperature in New London

In September in New London, the average temperature is 26°C (80°F). Maximum temperatures can reach up to 39°C (102°F), while the minimum can drop as low as 11°C (52°F). Be prepared for a wide range of temperatures to make the most of your travel experience.

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 26°C (80°F), with highs reaching up to 39°C (102°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec495161657481848479695753
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 89 mm (3.5 in) during a span of 9 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 89 mm (3.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec1081451271331441088271899756117
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 65%. With an average temperature of 26°C (80°F), this humidity feels like a warm, sticky embrace, making travel less comfortable as you navigate the sights.

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 65%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%78%78%81%78%73%66%65%72%82%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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec478101111111110864
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 Weather9°C (49°F)108 mm (4.3 inches)80%moderate
February Weather11°C (51°F)145 mm (5.7 inches)79%high
March Weather16°C (61°F)127 mm (5.0 inches)78%very high
April Weather19°C (66°F)133 mm (5.2 inches)78%very high
May Weather23°C (75°F)144 mm (5.7 inches)81%extreme
June Weather27°C (81°F)108 mm (4.2 inches)78%extreme
July Weather29°C (84°F)82 mm (3.2 inches)73%extreme
August Weather29°C (85°F)71 mm (2.8 inches)66%extreme
September Weather26°C (80°F)89 mm (3.5 inches)65%very high
October Weather21°C (69°F)97 mm (3.8 inches)72%very high
November Weather14°C (58°F)56 mm (2.2 inches)82%high
December Weather12°C (53°F)117 mm (4.6 inches)87%moderate

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