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September Weather in De Kalb, United States

Last updated: June 24, 2025

In September, the average temperature in De Kalb, United States is a pleasant 26°C (78°F). However, temperatures can vary significantly, with a minimum of 10°C (50°F) and a maximum soaring to 38°C (101°F). During this time, expect 80 mm (3.1 in) of rainfall spread over about 8 days, contributing to an average humidity level of 63%. Perfect for those who enjoy a mix of warmth and occasional rain!

September Temperature in De Kalb

In September in De Kalb, the average temperature is 26°C (78°F), with maximums reaching up to 38°C (101°F) and minimums dropping as low as 10°C (50°F). It’s a versatile climate that allows for both warm beach days and cooler evenings, making it an ideal destination for travelers seeking a range of outdoor activities.

September Weather in De Kalb: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in De Kalb, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In De Kalb, September typically has an average temperature of 26°C (78°F), with highs reaching up to 38°C (101°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec464858637380838278675450
Data source: Temperature data for De Kalb 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 De Kalb

In De Kalb in September, the precipitation amount is 80 mm (3.1 in) over a period of 8 days.

September Precipitation Trends in De Kalb

The chart displays monthly precipitation patterns in De Kalb, 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 De Kalb, September typically receives around 80 mm (3.1 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec10415113421717210577938012068127
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in De Kalb

In De Kalb in September humidity is 63%. With an average temperature of 26°C (78°F), this humidity feels like a warm, tropical embrace, making outdoor activities pleasantly refreshing yet slightly sticky, perfect for leisurely strolls and beachside adventures.

September Average Humidity in De Kalb

This chart illustrates the average monthly humidity levels in De Kalb, 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 De Kalb is approximately 63%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%78%79%81%77%72%65%63%70%82%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in De Kalb

In De Kalb in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in De Kalb.

Maximum UV Index Levels in De Kalb for September

The chart shows the monthly maximum UV Index (UVI) for De Kalb 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 De Kalb typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110864
Data source: De Kalb 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 De Kalb Compares to Other Months

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

This table compares monthly weather conditions in De Kalb, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (46°F)104 mm (4.1 inches)82%moderate
February Weather9°C (49°F)151 mm (6.0 inches)80%high
March Weather15°C (59°F)134 mm (5.3 inches)78%very high
April Weather17°C (63°F)217 mm (8.5 inches)79%very high
May Weather23°C (73°F)172 mm (6.8 inches)81%extreme
June Weather27°C (80°F)105 mm (4.1 inches)77%extreme
July Weather28°C (83°F)77 mm (3.0 inches)72%extreme
August Weather28°C (83°F)93 mm (3.7 inches)65%extreme
September Weather26°C (78°F)80 mm (3.1 inches)63%very high
October Weather19°C (67°F)120 mm (4.7 inches)70%very high
November Weather13°C (55°F)68 mm (2.7 inches)82%high
December Weather10°C (50°F)127 mm (5.0 inches)88%moderate

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