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September Weather in Winchendon, United States

Last updated: June 24, 2025

The average temperature in Winchendon, United States during September is a pleasant 17°C (64°F). However, temperatures can range significantly, dipping to a chilly 1°C (34°F) and peaking at a warm 33°C (91°F). Expect 88 mm (3.5 in) of precipitation spread over about 8 days, with an average humidity of 71% making for a comfortable yet moist environment.

September Temperature in Winchendon

In September in Winchendon, the average temperature is 17°C (64°F), with maximums reaching up to 33°C (91°F) and minimums dropping as low as 1°C (34°F). This varying climate makes it essential to pack layers for your travels to Winchendon.

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

The chart illustrates September temperature patterns in Winchendon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Winchendon, September typically has an average temperature of 17°C (64°F), with highs reaching up to 33°C (91°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec252834455767727163523829
Data source: Temperature data for Winchendon 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 Winchendon

In Winchendon in September, the precipitation amount is 88 mm (3.5 in) over the course of 8 days.

September Precipitation Trends in Winchendon

The chart displays monthly precipitation patterns in Winchendon, 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 Winchendon, September typically receives around 88 mm (3.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec769084132908915110288136104125
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Winchendon

In Winchendon in September humidity is 71%. With an average temperature of 17°C (64°F), this humidity feels like a warm, enveloping embrace that can make travel feel a bit sticky, yet still pleasant as you explore the sights with a gentle sheen of perspiration.

September Average Humidity in Winchendon

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

In Winchendon 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 Winchendon.

Maximum UV Index Levels in Winchendon for September

The chart shows the monthly maximum UV Index (UVI) for Winchendon 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 Winchendon typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3568910997632
Data source: Winchendon 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 Winchendon Compares to Other Months

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

This table compares monthly weather conditions in Winchendon, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)76 mm (3.0 inches)86%moderate
February Weather-2°C (28°F)90 mm (3.6 inches)84%moderate
March Weather1°C (34°F)84 mm (3.3 inches)82%high
April Weather7°C (46°F)132 mm (5.2 inches)80%very high
May Weather14°C (57°F)90 mm (3.5 inches)72%very high
June Weather20°C (67°F)89 mm (3.5 inches)72%very high
July Weather22°C (73°F)151 mm (5.9 inches)67%very high
August Weather22°C (71°F)102 mm (4.0 inches)66%very high
September Weather17°C (64°F)88 mm (3.5 inches)71%high
October Weather11°C (53°F)136 mm (5.4 inches)78%high
November Weather3°C (39°F)104 mm (4.1 inches)84%moderate
December Weather-2°C (29°F)125 mm (4.9 inches)81%low

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