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September Weather in Mendon, United States

Last updated: June 24, 2025

In September, the average temperature in Mendon, United States hovers around 20°C (69°F), with a minimum dipping to 4°C (39°F) and a maximum soaring up to 33°C (92°F). Expect 70 mm (2.8 in) of precipitation spread over approximately 8 days, contributing to an average humidity level of 78%. Stay prepared for a mix of warmth and occasional showers!

September Temperature in Mendon

In September in Mendon, the average temperature is 20°C (69°F). Maximums can reach 33°C (92°F), while minimums can drop to as low as 4°C (39°F). This variation in temperature makes it a perfect time for travelers to enjoy a mix of warm days and cooler nights, allowing for comfortable outdoor activities.

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

The chart illustrates September temperature patterns in Mendon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mendon, September typically has an average temperature of 20°C (69°F), with highs reaching up to 33°C (92°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec293241516372767368574135
Data source: Temperature data for Mendon 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 Mendon

In Mendon in September, the total precipitation amount is 70 mm (2.8 in), spread over the course of 8 days.

September Precipitation Trends in Mendon

The chart displays monthly precipitation patterns in Mendon, 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 Mendon, September typically receives around 70 mm (2.8 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec75871019612912811210470938464
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mendon

In Mendon 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 Mendon

This chart illustrates the average monthly humidity levels in Mendon, 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 Mendon is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%87%88%81%82%81%78%78%82%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mendon

In Mendon 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 Mendon.

Maximum UV Index Levels in Mendon for September

The chart shows the monthly maximum UV Index (UVI) for Mendon 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 Mendon typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Mendon 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 Mendon Compares to Other Months

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

This table compares monthly weather conditions in Mendon, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)75 mm (2.9 inches)88%moderate
February Weather0°C (32°F)87 mm (3.4 inches)87%moderate
March Weather5°C (41°F)101 mm (4.0 inches)87%high
April Weather10°C (51°F)96 mm (3.8 inches)87%very high
May Weather17°C (63°F)129 mm (5.1 inches)81%very high
June Weather22°C (72°F)128 mm (5.0 inches)82%very high
July Weather24°C (76°F)112 mm (4.4 inches)81%very high
August Weather23°C (73°F)104 mm (4.1 inches)78%very high
September Weather20°C (69°F)70 mm (2.8 inches)78%very high
October Weather14°C (57°F)93 mm (3.7 inches)82%high
November Weather5°C (42°F)84 mm (3.3 inches)89%moderate
December Weather2°C (35°F)64 mm (2.5 inches)86%low

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