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September Weather in Blanchester, United States

Last updated: June 24, 2025

In Blanchester, United States, the average temperature for September hovers around 21°C (70°F), providing a pleasant climate for outdoor activities. Temperatures can range from a cool 6°C (43°F) to a warm 34°C (93°F), offering a varied experience throughout the month. However, be prepared for some rain, as the area receives approximately 87 mm (3.4 in) of precipitation over 8 days. With an average humidity of 73%, the air can feel quite comfortable.

September Temperature in Blanchester

In September in Blanchester, the average temperature is 21°C (70°F), with maximums reaching 34°C (93°F) and minimums dropping as low as 6°C (43°F). This makes it a great time to explore the area, as you can enjoy warm days and cool evenings.

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

The chart illustrates September temperature patterns in Blanchester, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Blanchester, September typically has an average temperature of 21°C (70°F), with highs reaching up to 34°C (93°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec323644546573777470594338
Data source: Temperature data for Blanchester 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 Blanchester

In Blanchester in September, the precipitation amount is 87 mm (3.4 in), which occurs over a span of 8 days.

September Precipitation Trends in Blanchester

The chart displays monthly precipitation patterns in Blanchester, 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 Blanchester, September typically receives around 87 mm (3.4 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec84112142128131131118828797102118
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Blanchester

In Blanchester in September, humidity is 73%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace that can make outdoor activities feel sweltering, so it's essential to stay hydrated and take breaks in the shade while exploring.

September Average Humidity in Blanchester

This chart illustrates the average monthly humidity levels in Blanchester, 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 Blanchester is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%85%81%82%81%73%73%78%89%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Blanchester

In Blanchester 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 Blanchester.

Maximum UV Index Levels in Blanchester for September

The chart shows the monthly maximum UV Index (UVI) for Blanchester 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 Blanchester typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098643
Data source: Blanchester 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 Blanchester Compares to Other Months

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

This table compares monthly weather conditions in Blanchester, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)84 mm (3.3 inches)88%moderate
February Weather2°C (37°F)112 mm (4.4 inches)88%moderate
March Weather7°C (45°F)142 mm (5.6 inches)87%high
April Weather12°C (54°F)128 mm (5.0 inches)85%very high
May Weather18°C (65°F)131 mm (5.2 inches)81%very high
June Weather23°C (73°F)131 mm (5.2 inches)82%very high
July Weather25°C (77°F)118 mm (4.6 inches)81%very high
August Weather23°C (74°F)82 mm (3.2 inches)73%very high
September Weather21°C (70°F)87 mm (3.4 inches)73%very high
October Weather15°C (59°F)97 mm (3.8 inches)78%high
November Weather6°C (43°F)102 mm (4.0 inches)89%moderate
December Weather3°C (38°F)118 mm (4.6 inches)87%moderate

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