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September Weather in Andover, United States

Last updated: June 24, 2025

In September, the average temperature in Andover, United States hovers around 14°C (58°F), with lows dipping to 0°C (33°F) and highs reaching up to 27°C (82°F). Expect 63 mm (2.5 in) of precipitation spread across approximately 8 days, contributing to an average humidity of 77%. This blend of cool temperatures and moderate rainfall makes for a unique climate experience.

September Temperature in Andover

In September in Andover, the average temperature is 14°C (58°F), with maximums reaching up to 27°C (82°F) and minimums dropping as low as 0°C (33°F). It's a time of year when travelers can enjoy both mild days and cooler evenings, making it ideal for outdoor activities and exploration.

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

The chart illustrates September temperature patterns in Andover, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Andover, September typically has an average temperature of 14°C (58°F), with highs reaching up to 27°C (82°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec161926375060666558463221
Data source: Temperature data for Andover 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 Andover

In Andover in September, the precipitation amount is 63 mm (2.5 in) spread over 8 days.

September Precipitation Trends in Andover

The chart displays monthly precipitation patterns in Andover, 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 Andover, September typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec81837111384881159463119101101
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Andover

In Andover in September, humidity is 77%. With an average temperature of 14°C (58°F), this humidity feels like a warm blanket wrapping around you, making traveling feel sticky and heavy, yet still manageable as you explore the sights.

September Average Humidity in Andover

This chart illustrates the average monthly humidity levels in Andover, 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 Andover is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%85%84%78%72%75%74%77%85%86%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Andover

In Andover 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 Andover.

Maximum UV Index Levels in Andover for September

The chart shows the monthly maximum UV Index (UVI) for Andover 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 Andover typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2468910997532
Data source: Andover 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 Andover Compares to Other Months

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

This table compares monthly weather conditions in Andover, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (16°F)81 mm (3.2 inches)91%low
February Weather-7°C (19°F)83 mm (3.3 inches)89%moderate
March Weather-4°C (26°F)71 mm (2.8 inches)85%high
April Weather3°C (38°F)113 mm (4.5 inches)84%very high
May Weather10°C (50°F)84 mm (3.3 inches)78%very high
June Weather16°C (61°F)88 mm (3.5 inches)72%very high
July Weather19°C (67°F)115 mm (4.5 inches)75%very high
August Weather18°C (65°F)94 mm (3.7 inches)74%very high
September Weather14°C (58°F)63 mm (2.5 inches)77%high
October Weather8°C (47°F)119 mm (4.7 inches)85%moderate
November Weather0°C (32°F)101 mm (4.0 inches)86%moderate
December Weather-6°C (21°F)101 mm (4.0 inches)85%low

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