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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 12°C (54°F), with extremes ranging from a chilly -2°C (29°F) to a warm 30°C (87°F). Expect 144 mm (5.7 in) of rain spread over roughly 15 days, contributing to a notable average humidity of 81%. Embrace the balance of warmth and moisture in this charming locale!

October Temperature in Decatur

In October in Decatur, the average temperature is 12°C (54°F). Maximums can reach 30°C (87°F), and minimums can be as low as -2°C (29°F). This wide temperature range means travelers should be prepared for both warm and chilly weather during their visit.

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 12°C (54°F), with highs reaching up to 30°C (87°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec272838476071757266544033
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 144 mm (5.7 in) during a span of 15 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 144 mm (5.7 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec74779010916913711995841447365
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 81%. With an average temperature of 12°C (54°F), this humidity feels like a damp blanket enveloping you, making travel sluggish and uncomfortable as you battle the stickiness while trying to enjoy your 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 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%86%87%81%82%81%79%78%81%89%86%
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 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Decatur, you can refer to this 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 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689101098642
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 Weather-3°C (27°F)74 mm (2.9 inches)85%moderate
February Weather-2°C (29°F)77 mm (3.0 inches)85%moderate
March Weather3°C (39°F)90 mm (3.5 inches)86%high
April Weather8°C (48°F)109 mm (4.3 inches)87%very high
May Weather16°C (61°F)168 mm (6.6 inches)81%very high
June Weather22°C (71°F)137 mm (5.4 inches)82%very high
July Weather24°C (75°F)119 mm (4.7 inches)81%very high
August Weather22°C (72°F)95 mm (3.7 inches)79%very high
September Weather19°C (67°F)84 mm (3.3 inches)78%very high
October Weather12°C (54°F)144 mm (5.7 inches)81%high
November Weather4°C (40°F)73 mm (2.9 inches)89%moderate
December Weather1°C (34°F)65 mm (2.6 inches)86%low

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