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September Weather in Unionville, United States

Last updated: June 24, 2025

In Unionville, United States, the average temperature in September hovers around 23°C (74°F). While temperatures can dip to a chilly 8°C (47°F), they can also soar to a sweltering 36°C (97°F). During this month, expect about 117 mm (4.6 in) of precipitation over 9 days, contributing to an average humidity of 64%.

September Temperature in Unionville

In September in Unionville, the average temperature is 23°C (74°F). The maximum can reach 36°C (97°F) and the minimum can be as low as 8°C (47°F). This makes it an ideal destination for travelers seeking warm weather, but be prepared for cooler evenings.

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 23°C (74°F), with highs reaching up to 36°C (97°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec424654607076797874644946
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 total precipitation amount is 117 mm (4.6 in) spread over a period of 9 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 117 mm (4.6 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec11518818015611513814311511712276147
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 64%. With an average temperature of 23°C (74°F), this humidity feels like a warm blanket wrapping around you, making outdoor exploration enjoyable yet slightly sticky, so it's best to stay hydrated and take breaks in the shade while 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 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%85%82%83%82%78%67%64%75%87%89%
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 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36810101111109753
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 Weather5°C (42°F)115 mm (4.5 inches)87%moderate
February Weather8°C (47°F)188 mm (7.4 inches)87%high
March Weather12°C (54°F)180 mm (7.1 inches)85%very high
April Weather15°C (60°F)156 mm (6.1 inches)82%very high
May Weather21°C (70°F)115 mm (4.5 inches)83%very high
June Weather25°C (76°F)138 mm (5.4 inches)82%extreme
July Weather26°C (80°F)143 mm (5.6 inches)78%extreme
August Weather25°C (78°F)115 mm (4.5 inches)67%very high
September Weather23°C (74°F)117 mm (4.6 inches)64%very high
October Weather18°C (64°F)122 mm (4.8 inches)74%high
November Weather10°C (49°F)76 mm (3.0 inches)87%moderate
December Weather8°C (46°F)147 mm (5.8 inches)88%moderate

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