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September Weather in South Pekin, United States

Last updated: June 24, 2025

In South Pekin, United States, the average temperature in September hovers around a comfortable 21°C (70°F). However, be prepared for temperature fluctuations, as it can dip to a chilly 6°C (42°F) or soar to a sizzling 35°C (95°F). During this time, expect 68 mm (2.7 in) of precipitation over about 7 days, with an average humidity level of 80%. Embrace the warmth while staying hydrated!

September Temperature in South Pekin

In September in South Pekin, the average temperature is 21°C (70°F). Maximum temperatures can reach 35°C (95°F), while the minimum can drop to as low as 6°C (42°F). Be prepared for a range of temperatures and pack accordingly for your travels.

September Weather in South Pekin: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in South Pekin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Pekin, 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 6°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec273042526474777470564135
Data source: Temperature data for South Pekin 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 South Pekin

In South Pekin in September, the precipitation amount is 68 mm (2.7 in) over the course of 7 days.

September Precipitation Trends in South Pekin

The chart displays monthly precipitation patterns in South Pekin, 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 South Pekin, September typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec646911811716515011289681226054
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in South Pekin

In South Pekin 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 South Pekin

This chart illustrates the average monthly humidity levels in South Pekin, 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 South Pekin 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 South Pekin

In South Pekin 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 South Pekin.

Maximum UV Index Levels in South Pekin for September

The chart shows the monthly maximum UV Index (UVI) for South Pekin 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 South Pekin typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357810111098642
Data source: South Pekin 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 South Pekin Compares to Other Months

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

This table compares monthly weather conditions in South Pekin, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (28°F)64 mm (2.5 inches)82%moderate
February Weather-1°C (30°F)69 mm (2.7 inches)83%moderate
March Weather6°C (43°F)118 mm (4.6 inches)84%high
April Weather11°C (52°F)117 mm (4.6 inches)85%very high
May Weather18°C (65°F)165 mm (6.5 inches)79%very high
June Weather23°C (75°F)150 mm (5.9 inches)82%extreme
July Weather25°C (77°F)112 mm (4.4 inches)80%very high
August Weather24°C (75°F)89 mm (3.5 inches)81%very high
September Weather21°C (70°F)68 mm (2.7 inches)80%very high
October Weather13°C (57°F)122 mm (4.8 inches)82%high
November Weather5°C (41°F)60 mm (2.4 inches)88%moderate
December Weather2°C (35°F)54 mm (2.1 inches)84%low

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