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September Weather in Glastonbury, United States

Last updated: June 24, 2025

In Glastonbury, United States, the average temperature in September hovers around 19°C (67°F). Expect a range from a cool 3°C (37°F) to a warm 34°C (94°F). During this time, you can anticipate about 98 mm (3.8 in) of precipitation spread over 9 days, along with an average humidity level of 68%.

September Temperature in Glastonbury

In September in Glastonbury, the average temperature is 19°C (67°F). Maximums can reach 34°C (94°F), while minimums can be as low as 3°C (37°F). Pack accordingly to enjoy the varied climate during your travels!

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

The chart illustrates September temperature patterns in Glastonbury, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Glastonbury, September typically has an average temperature of 19°C (67°F), with highs reaching up to 34°C (94°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec303339495969757366564234
Data source: Temperature data for Glastonbury 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 Glastonbury

In Glastonbury in September, the precipitation amount is 98 mm (3.8 in) occurring over the course of 9 days.

September Precipitation Trends in Glastonbury

The chart displays monthly precipitation patterns in Glastonbury, 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 Glastonbury, September typically receives around 98 mm (3.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec66868912511385145909813291123
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Glastonbury

In Glastonbury in September, humidity is 68%. With an average temperature of 19°C (67°F), this humidity feels like a warm, enveloping blanket, making travel pleasant yet slightly muggy, which can be refreshing while exploring but may require occasional breaks to stay comfortable.

September Average Humidity in Glastonbury

This chart illustrates the average monthly humidity levels in Glastonbury, 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 Glastonbury is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Glastonbury

In Glastonbury in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Glastonbury.

Maximum UV Index Levels in Glastonbury for September

The chart shows the monthly maximum UV Index (UVI) for Glastonbury 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 Glastonbury typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3568910998642
Data source: Glastonbury 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 Glastonbury Compares to Other Months

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

This table compares monthly weather conditions in Glastonbury, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)66 mm (2.6 inches)84%moderate
February Weather1°C (33°F)86 mm (3.4 inches)82%moderate
March Weather4°C (39°F)89 mm (3.5 inches)81%high
April Weather9°C (49°F)125 mm (4.9 inches)78%very high
May Weather15°C (60°F)113 mm (4.5 inches)69%very high
June Weather20°C (69°F)85 mm (3.4 inches)69%very high
July Weather24°C (75°F)144 mm (5.7 inches)62%very high
August Weather23°C (74°F)90 mm (3.5 inches)65%very high
September Weather19°C (67°F)98 mm (3.8 inches)68%very high
October Weather13°C (56°F)132 mm (5.2 inches)74%high
November Weather6°C (43°F)91 mm (3.6 inches)82%moderate
December Weather1°C (34°F)123 mm (4.9 inches)80%low

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