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September Weather in Unionville, United States

Last updated: June 24, 2025

The average temperature in Unionville, United States during September is a pleasant 19°C (66°F). However, temperatures can vary significantly, with a minimum of 4°C (39°F) and a maximum of 33°C (91°F). Visitors can expect 107 mm (4.2 in) of precipitation over approximately 10 days, coupled with an average humidity of 68%.

September Temperature in Unionville

In September in Unionville, the average temperature is 19°C (66°F). Maximum temperatures can reach 33°C (91°F), while minimums can drop as low as 4°C (39°F). This makes Unionville an ideal destination for travelers seeking a pleasant climate with a range of temperatures.

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

The chart illustrates September temperature patterns in Unionville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Unionville, September typically has an average temperature of 19°C (66°F), with highs reaching up to 33°C (91°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec303338496069747266564234
Data source: Temperature data for Unionville 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 Unionville

In Unionville in September, the precipitation amount is 107 mm (4.2 in) accumulated over a period of 10 days.

September Precipitation Trends in Unionville

The chart displays monthly precipitation patterns in Unionville, 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 Unionville, September typically receives around 107 mm (4.2 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec7198921141299713513010713988103
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Unionville

In Unionville in September humidity is 68%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, creating a sticky atmosphere that can be a bit uncomfortable for traveling.

September Average Humidity in Unionville

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

In Unionville 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 Unionville.

Maximum UV Index Levels in Unionville for September

The chart shows the monthly maximum UV Index (UVI) for Unionville 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 Unionville typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: Unionville 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 Unionville Compares to Other Months

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

This table compares monthly weather conditions in Unionville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)71 mm (2.8 inches)84%moderate
February Weather0°C (33°F)98 mm (3.8 inches)82%moderate
March Weather3°C (39°F)92 mm (3.6 inches)81%high
April Weather10°C (49°F)114 mm (4.5 inches)78%very high
May Weather15°C (60°F)129 mm (5.1 inches)69%very high
June Weather20°C (69°F)97 mm (3.8 inches)69%very high
July Weather24°C (75°F)135 mm (5.3 inches)62%very high
August Weather22°C (73°F)130 mm (5.1 inches)65%very high
September Weather19°C (66°F)107 mm (4.2 inches)68%very high
October Weather13°C (56°F)139 mm (5.5 inches)74%high
November Weather5°C (42°F)88 mm (3.5 inches)82%moderate
December Weather1°C (34°F)103 mm (4.1 inches)80%low

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