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September Weather in Hanover, United States

Last updated: June 24, 2025

In Hanover, United States, the average temperature in September is a pleasant 22°C (72°F). Expect variations, with minimums dipping to 5°C (41°F) and maximums soaring up to 38°C (100°F). During this month, you'll encounter approximately 69 mm (2.7 in) of precipitation over 6 days, and the average humidity hovers around 71%, adding to the overall experience of the season.

September Temperature in Hanover

In September in Hanover, the average temperature is 22°C (72°F). Maximums can reach 38°C (100°F) and minimums can be as low as 5°C (41°F). This variation makes it essential for travelers to pack both lightweight clothing for the warm days and warmer layers for the cooler evenings.

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

The chart illustrates September temperature patterns in Hanover, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hanover, September typically has an average temperature of 22°C (72°F), with highs reaching up to 38°C (100°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec292944526477807672544235
Data source: Temperature data for Hanover 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 Hanover

In Hanover in September, the precipitation amount is 69 mm (2.7 in) over a period of 6 days.

September Precipitation Trends in Hanover

The chart displays monthly precipitation patterns in Hanover, 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 Hanover, September typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec28278854183947488691192831
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Hanover

In Hanover in September humidity is 71%. With an average temperature of 22°C (72°F), this humidity feels like the air is thick and slightly stifling, making outdoor activities require frequent breaks to stay hydrated and cool.

September Average Humidity in Hanover

This chart illustrates the average monthly humidity levels in Hanover, 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 Hanover is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%78%70%73%82%82%81%78%71%71%81%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Hanover

In Hanover in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Hanover.

Maximum UV Index Levels in Hanover for September

The chart shows the monthly maximum UV Index (UVI) for Hanover 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 Hanover typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
Data source: Hanover 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 Hanover Compares to Other Months

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

This table compares monthly weather conditions in Hanover, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)28 mm (1.1 inches)76%moderate
February Weather-2°C (29°F)26 mm (1.0 inches)77%moderate
March Weather6°C (44°F)88 mm (3.5 inches)70%high
April Weather11°C (53°F)54 mm (2.1 inches)73%very high
May Weather18°C (64°F)183 mm (7.2 inches)82%very high
June Weather25°C (78°F)94 mm (3.7 inches)82%extreme
July Weather27°C (80°F)74 mm (2.9 inches)81%extreme
August Weather25°C (76°F)88 mm (3.5 inches)78%very high
September Weather22°C (72°F)69 mm (2.7 inches)71%very high
October Weather12°C (55°F)119 mm (4.7 inches)71%high
November Weather6°C (43°F)28 mm (1.1 inches)81%moderate
December Weather1°C (35°F)31 mm (1.2 inches)84%moderate

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