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September Weather in Millbury, United States

Last updated: June 24, 2025

In Millbury, United States, the average temperature in September hovers around 19°C (66°F). During this month, you can expect minimum temperatures to dip as low as 4°C (40°F), while highs can reach up to 34°C (94°F). Rainfall is also a factor, with 93 mm (3.7 in) of precipitation spread over 8 days, contributing to an average humidity level of 71%.

September Temperature in Millbury

In September in Millbury, the average temperature is 19°C (66°F). Maximums can reach 34°C (94°F) and minimums can be as low as 4°C (40°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Millbury, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Millbury, September typically has an average temperature of 19°C (66°F), with highs reaching up to 34°C (94°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec293237475868737265554133
Data source: Temperature data for Millbury 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 Millbury

In Millbury in September, the total precipitation amount is 93 mm (3.7 in) over the course of 8 days.

September Precipitation Trends in Millbury

The chart displays monthly precipitation patterns in Millbury, 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 Millbury, September typically receives around 93 mm (3.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec728890130949515010193141101124
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Millbury

In Millbury in September humidity is 71%. With an average temperature of 19°C (66°F), this humidity feels like a warm, balmy embrace that enhances the tropical atmosphere, making it a perfect backdrop for leisurely strolls and outdoor adventures, though it may also lead to a slightly sticky feeling as you explore.

September Average Humidity in Millbury

This chart illustrates the average monthly humidity levels in Millbury, 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 Millbury is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%82%80%72%72%67%66%71%79%84%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Millbury

In Millbury 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 Millbury.

Maximum UV Index Levels in Millbury for September

The chart shows the monthly maximum UV Index (UVI) for Millbury 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 Millbury typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3568910997642
Data source: Millbury 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 Millbury Compares to Other Months

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

This table compares monthly weather conditions in Millbury, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)72 mm (2.8 inches)86%moderate
February Weather0°C (32°F)88 mm (3.5 inches)84%moderate
March Weather3°C (37°F)90 mm (3.5 inches)82%high
April Weather9°C (48°F)130 mm (5.1 inches)80%very high
May Weather14°C (58°F)94 mm (3.7 inches)72%very high
June Weather20°C (68°F)95 mm (3.7 inches)72%very high
July Weather23°C (74°F)150 mm (5.9 inches)67%very high
August Weather22°C (73°F)101 mm (4.0 inches)66%very high
September Weather19°C (66°F)93 mm (3.7 inches)71%high
October Weather13°C (55°F)141 mm (5.5 inches)78%high
November Weather5°C (42°F)101 mm (4.0 inches)84%moderate
December Weather0°C (33°F)123 mm (4.9 inches)81%low

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