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September Weather in Amherst, United States

Last updated: June 24, 2025

In September, the average temperature in Amherst, United States is a pleasant 17°C (62°F). However, temperatures can vary significantly, with a minimum of 1°C (34°F) and a maximum of 32°C (91°F). Expect about 98 mm (3.8 in) of precipitation spread over 10 days, and high humidity levels at an average of 78%.

September Temperature in Amherst

In September in Amherst, the average temperature is 17°C (62°F). Maximum temperatures can reach 32°C (91°F), while minimums can drop as low as 1°C (34°F). This variation makes Amherst an ideal destination for travelers seeking diverse weather experiences.

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

The chart illustrates September temperature patterns in Amherst, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Amherst, 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 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec181933435768726962483425
Data source: Temperature data for Amherst 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 Amherst

In Amherst in September, the precipitation amount is 98 mm (3.8 in) spread over a period of 10 days.

September Precipitation Trends in Amherst

The chart displays monthly precipitation patterns in Amherst, 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 Amherst, September typically receives around 98 mm (3.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec385162102110113129137981064953
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Amherst

In Amherst 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 Amherst

This chart illustrates the average monthly humidity levels in Amherst, 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 Amherst 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 Amherst

In Amherst 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 Amherst.

Maximum UV Index Levels in Amherst for September

The chart shows the monthly maximum UV Index (UVI) for Amherst 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 Amherst typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
Data source: Amherst 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 Amherst Compares to Other Months

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

This table compares monthly weather conditions in Amherst, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (19°F)38 mm (1.5 inches)89%low
February Weather-7°C (19°F)51 mm (2.0 inches)90%moderate
March Weather0°C (33°F)62 mm (2.4 inches)87%moderate
April Weather6°C (43°F)102 mm (4.0 inches)84%very high
May Weather14°C (57°F)110 mm (4.3 inches)77%very high
June Weather20°C (68°F)113 mm (4.5 inches)75%very high
July Weather22°C (72°F)129 mm (5.1 inches)74%very high
August Weather20°C (69°F)137 mm (5.4 inches)73%very high
September Weather17°C (62°F)98 mm (3.8 inches)78%high
October Weather9°C (49°F)106 mm (4.2 inches)84%moderate
November Weather1°C (34°F)49 mm (1.9 inches)89%moderate
December Weather-4°C (25°F)53 mm (2.1 inches)87%low

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