nomadseason

September Weather in Andover, United States

Last updated: June 24, 2025

In September in Andover, United States, the average temperature hovers around 18°C (64°F), with a minimum of 2°C (35°F) and a peak reaching 33°C (91°F). Expect approximately 112 mm (4.4 in) of precipitation over 10 days, contributing to an average humidity of 81%. Perfect for those who love a lush, vibrant atmosphere!

September Temperature in Andover

In September in Andover, the average temperature is 18°C (64°F). Maximums can reach 33°C (91°F), and minimums can be as low as 2°C (35°F). It's advisable to pack layers to accommodate the warm days and cooler nights when traveling during this time.

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 18°C (64°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec161632435971747064483322
Data source: Temperature data for Andover generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Andover

In Andover in September, the total precipitation amount is 112 mm (4.4 in) over the course of 10 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 112 mm (4.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec23315494114791021341121043550
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Andover

In Andover in September, humidity is 81%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making travel both refreshing and slightly stifling at the same time.

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 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%90%85%84%78%80%81%81%81%84%88%84%
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.
JanFebMarAprMayJunJulAugSepOctNovDec2457810997532
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)23 mm (0.9 inches)87%low
February Weather-9°C (16°F)31 mm (1.2 inches)90%moderate
March Weather0°C (33°F)54 mm (2.1 inches)85%moderate
April Weather6°C (43°F)94 mm (3.7 inches)84%high
May Weather15°C (59°F)114 mm (4.5 inches)78%very high
June Weather22°C (71°F)79 mm (3.1 inches)80%very high
July Weather23°C (74°F)102 mm (4.0 inches)81%very high
August Weather21°C (71°F)134 mm (5.3 inches)81%very high
September Weather18°C (64°F)112 mm (4.4 inches)81%high
October Weather9°C (48°F)104 mm (4.1 inches)84%moderate
November Weather0°C (33°F)35 mm (1.4 inches)88%moderate
December Weather-5°C (23°F)50 mm (2.0 inches)84%low

Compare Andover's Climate with Cities Worldwide