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September Weather in Peoria, United States

Last updated: June 24, 2025

In Peoria, United States, the average temperature in September hovers around 21°C (70°F). Daily variations can bring a minimum of 5°C (42°F) and a maximum of 35°C (95°F). Expect 71 mm (2.8 in) of precipitation over about 7 days, and be prepared for an average humidity of 80%.

September Temperature in Peoria

In September in Peoria, the average temperature is 21°C (70°F), with maximums reaching 35°C (95°F) and minimums dropping as low as 5°C (42°F). This diverse range in temperatures makes it essential to pack for both warm days and cooler evenings during your travels.

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

The chart illustrates September temperature patterns in Peoria, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Peoria, 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 (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec262941516474777470564034
Data source: Temperature data for Peoria 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 Peoria

In Peoria in September, the precipitation amount is 71 mm (2.8 in) over a span of 7 days.

September Precipitation Trends in Peoria

The chart displays monthly precipitation patterns in Peoria, 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 Peoria, September typically receives around 71 mm (2.8 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec616710811616714810774711315755
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Peoria

In Peoria 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 Peoria

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

In Peoria 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 Peoria.

Maximum UV Index Levels in Peoria for September

The chart shows the monthly maximum UV Index (UVI) for Peoria 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 Peoria typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35789111098642
Data source: Peoria 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 Peoria Compares to Other Months

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

This table compares monthly weather conditions in Peoria, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)61 mm (2.4 inches)82%moderate
February Weather-2°C (29°F)67 mm (2.7 inches)83%moderate
March Weather5°C (42°F)108 mm (4.3 inches)84%high
April Weather10°C (51°F)116 mm (4.6 inches)85%very high
May Weather18°C (64°F)167 mm (6.6 inches)79%very high
June Weather23°C (74°F)148 mm (5.8 inches)82%extreme
July Weather25°C (77°F)107 mm (4.2 inches)80%very high
August Weather23°C (74°F)74 mm (2.9 inches)81%very high
September Weather21°C (70°F)71 mm (2.8 inches)80%very high
October Weather13°C (56°F)131 mm (5.2 inches)82%high
November Weather4°C (40°F)57 mm (2.3 inches)88%moderate
December Weather1°C (34°F)55 mm (2.2 inches)84%low

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