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September Weather in Montpelier, United States

Last updated: June 24, 2025

In September, the average temperature in Montpelier, United States is a pleasant 20°C (69°F). Expect temperatures to range from a chilly 4°C (40°F) to a warm 33°C (91°F). During this month, you'll encounter approximately 73 mm (2.9 in) of precipitation over about 8 days, with an average humidity of 78%. Enjoy the diverse weather while exploring!

September Temperature in Montpelier

In September in Montpelier, the average temperature is 20°C (69°F). Maximum temperatures can reach 33°C (91°F), while minimum temperatures can drop as low as 4°C (40°F). This range of temperatures makes Montpelier a great destination for outdoor activities and versatile wardrobe choices during your travels.

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

The chart illustrates September temperature patterns in Montpelier, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Montpelier, September typically has an average temperature of 20°C (69°F), with highs reaching up to 33°C (91°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec293241516373767369574135
Data source: Temperature data for Montpelier 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 Montpelier

In Montpelier in September, the precipitation amount is 73 mm (2.9 in) over a span of 8 days.

September Precipitation Trends in Montpelier

The chart displays monthly precipitation patterns in Montpelier, 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 Montpelier, September typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec76871039412711210599741008268
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Montpelier

In Montpelier in September, humidity is 78%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel somewhat uncomfortable as sweat clings to your skin and the air feels thick and heavy, urging you to seek out shaded areas and refreshing drinks.

September Average Humidity in Montpelier

This chart illustrates the average monthly humidity levels in Montpelier, 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 Montpelier is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%86%87%81%82%81%79%78%81%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Montpelier

In Montpelier 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 Montpelier.

Maximum UV Index Levels in Montpelier for September

The chart shows the monthly maximum UV Index (UVI) for Montpelier 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 Montpelier typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098642
Data source: Montpelier 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 Montpelier Compares to Other Months

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

This table compares monthly weather conditions in Montpelier, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)76 mm (3.0 inches)85%moderate
February Weather0°C (32°F)87 mm (3.4 inches)85%moderate
March Weather5°C (42°F)103 mm (4.1 inches)86%high
April Weather10°C (51°F)94 mm (3.7 inches)87%very high
May Weather17°C (63°F)127 mm (5.0 inches)81%very high
June Weather23°C (73°F)112 mm (4.4 inches)82%extreme
July Weather24°C (76°F)105 mm (4.1 inches)81%very high
August Weather23°C (74°F)99 mm (3.9 inches)79%very high
September Weather20°C (69°F)73 mm (2.9 inches)78%very high
October Weather14°C (57°F)100 mm (3.9 inches)81%high
November Weather5°C (42°F)82 mm (3.2 inches)89%moderate
December Weather2°C (35°F)68 mm (2.7 inches)86%low

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