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October Weather in Decatur, United States

Last updated: June 24, 2025

In October, the average temperature in Decatur, United States is a mild 16°C (60°F). However, be prepared for a range, as temperatures can drop to a chilling -3°C (27°F) or soar to a warm 32°C (89°F). Expect about 162 mm (6.4 in) of precipitation spread over 10 days, and remember to stay comfortable with an average humidity of 70%.

October Temperature in Decatur

In October in Decatur, average temperature is 16°C (60°F). Maximum can reach 32°C (89°F) and minimum can be as low as -3°C (27°F). Therefore, travelers should be prepared for a wide range of weather conditions, from warm afternoons to chilly evenings.

October Weather in Decatur: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Decatur, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Decatur, October typically has an average temperature of 16°C (60°F), with highs reaching up to 32°C (89°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec384052576776807774604843
Data source: Temperature data for Decatur 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.

October Precipitation in Decatur

In Decatur in October, the precipitation amount is 162 mm (6.4 in) over a span of 10 days.

October Precipitation Trends in Decatur

The chart displays monthly precipitation patterns in Decatur, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Decatur, October typically receives around 162 mm (6.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec849514318317589101153711626670
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Decatur

In Decatur in October, humidity is 70%. With an average temperature of 16°C (60°F), this humidity feels like a damp blanket enveloping you, making it a bit uncomfortable for traveling as you may find yourself sweating more than usual and feeling slightly sticky as you explore the surroundings.

October Average Humidity in Decatur

This chart illustrates the average monthly humidity levels in Decatur, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Decatur is approximately 70%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%78%76%78%83%83%78%68%64%70%83%87%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Decatur

In Decatur in October, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Decatur.

Maximum UV Index Levels in Decatur for October

The chart shows the monthly maximum UV Index (UVI) for Decatur in October, 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 October, the maximum UV index in Decatur typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
Data source: Decatur October 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 October Weather in Decatur Compares to Other Months

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

This table compares monthly weather conditions in Decatur, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)84 mm (3.3 inches)81%moderate
February Weather5°C (41°F)95 mm (3.8 inches)78%high
March Weather11°C (52°F)143 mm (5.6 inches)76%high
April Weather14°C (57°F)183 mm (7.2 inches)78%very high
May Weather20°C (68°F)175 mm (6.9 inches)83%very high
June Weather25°C (76°F)88 mm (3.5 inches)83%extreme
July Weather26°C (80°F)101 mm (4.0 inches)78%extreme
August Weather25°C (77°F)153 mm (6.0 inches)68%very high
September Weather23°C (74°F)71 mm (2.8 inches)64%very high
October Weather16°C (60°F)162 mm (6.4 inches)70%high
November Weather9°C (48°F)66 mm (2.6 inches)83%moderate
December Weather6°C (44°F)70 mm (2.8 inches)87%moderate

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