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October Weather in Decatur, United States

Last updated: June 24, 2025

In October, the average temperature in Decatur, United States hovers around 18°C (65°F). Expect a range that can dip as low as -1°C (31°F) and soar up to 37°C (98°F). During this time, 124 mm (4.9 in) of precipitation falls over 9 days, contributing to an average humidity of 80%.

October Temperature in Decatur

In October in Decatur, the average temperature is 18°C (65°F). Maximums can reach 37°C (98°F), and minimums can drop to as low as -1°C (31°F). Be prepared for a wide range of temperatures when traveling to Decatur this month, as it can vary dramatically between day and night.

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 18°C (65°F), with highs reaching up to 37°C (98°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec434854607076807875655046
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 124 mm (4.9 in) over the course of 9 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 124 mm (4.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec981731621521201041081149312478133
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 80%. With an average temperature of 18°C (65°F), this humidity feels like wandering through a warm, damp blanket, making every step slightly heavy and resulting in a constant sheen of sweat, which can be both refreshing and exhausting for travelers.

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 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%82%85%85%83%76%76%80%88%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec36810111111109753
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 Weather6°C (43°F)98 mm (3.8 inches)86%moderate
February Weather9°C (48°F)173 mm (6.8 inches)86%high
March Weather12°C (54°F)162 mm (6.4 inches)86%very high
April Weather16°C (61°F)152 mm (6.0 inches)82%very high
May Weather21°C (71°F)120 mm (4.7 inches)85%extreme
June Weather24°C (76°F)104 mm (4.1 inches)85%extreme
July Weather27°C (80°F)108 mm (4.2 inches)83%extreme
August Weather26°C (79°F)114 mm (4.5 inches)76%very high
September Weather24°C (75°F)93 mm (3.7 inches)76%very high
October Weather18°C (65°F)124 mm (4.9 inches)80%high
November Weather10°C (51°F)78 mm (3.1 inches)88%moderate
December Weather8°C (47°F)133 mm (5.2 inches)88%moderate

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