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September Weather in Bloomington, United States

Last updated: June 24, 2025

The average temperature in Bloomington, United States during September is 21°C (70°F), with a minimum dropping to 5°C (41°F) and a maximum soaring to 35°C (95°F). Expect a total precipitation of 62 mm (2.4 in) over 7 days, while the humidity hovers around a comfortable 80%. Enjoy the dynamic weather that keeps each day interesting!

September Temperature in Bloomington

In September in Bloomington, the average temperature is 21°C (70°F). Maximums can reach 35°C (95°F), while minimums can drop to 5°C (41°F). This variability in temperature makes it essential for travelers to pack both lightweight clothing for the warm days and warmer layers for the cooler evenings.

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

The chart illustrates September temperature patterns in Bloomington, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bloomington, September typically has an average temperature of 21°C (70°F), with highs reaching up to 35°C (95°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec272942516474777470564034
Data source: Temperature data for Bloomington 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 Bloomington

In Bloomington in September, the total precipitation amount is 62 mm (2.4 in) observed over a span of 7 days.

September Precipitation Trends in Bloomington

The chart displays monthly precipitation patterns in Bloomington, 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 Bloomington, September typically receives around 62 mm (2.4 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec656911311815911910594621256255
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bloomington

In Bloomington in September humidity is 80%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that can make even short walks feel draining, urging travelers to seek shade or a cool drink frequently.

September Average Humidity in Bloomington

This chart illustrates the average monthly humidity levels in Bloomington, 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 Bloomington is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Bloomington

In Bloomington 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 Bloomington.

Maximum UV Index Levels in Bloomington for September

The chart shows the monthly maximum UV Index (UVI) for Bloomington 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 Bloomington typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910111098642
Data source: Bloomington 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 Bloomington Compares to Other Months

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

This table compares monthly weather conditions in Bloomington, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)65 mm (2.5 inches)82%moderate
February Weather-1°C (30°F)69 mm (2.7 inches)83%moderate
March Weather5°C (42°F)113 mm (4.4 inches)84%high
April Weather11°C (51°F)118 mm (4.6 inches)85%very high
May Weather18°C (64°F)159 mm (6.3 inches)79%very high
June Weather23°C (74°F)119 mm (4.7 inches)82%extreme
July Weather25°C (77°F)105 mm (4.1 inches)80%very high
August Weather23°C (74°F)94 mm (3.7 inches)81%very high
September Weather21°C (70°F)62 mm (2.4 inches)80%very high
October Weather13°C (56°F)125 mm (4.9 inches)82%high
November Weather5°C (41°F)62 mm (2.4 inches)88%moderate
December Weather1°C (35°F)55 mm (2.2 inches)84%low

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