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October Weather in Lemont, United States

Last updated: June 24, 2025

In October, the average temperature in Lemont, United States hovers around 12°C (55°F). Expect a minimum chill of -3°C (26°F) and the occasional warmth rising to a maximum of 31°C (88°F). During this period, you might encounter about 131 mm (5.2 in) of precipitation spread over 12 days, accompanied by an average humidity level of 82%.

October Temperature in Lemont

In October in Lemont, the average temperature is 12°C (55°F). The maximum can reach 31°C (88°F), and the minimum can be as low as -3°C (26°F). Be prepared for a wide range of temperatures when traveling to Lemont during this month.

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

The chart illustrates October temperature patterns in Lemont, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lemont, October typically has an average temperature of 12°C (55°F), with highs reaching up to 31°C (88°F) and lows dropping to around -3°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec262839486172757368543933
Data source: Temperature data for Lemont 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 Lemont

In Lemont in October, the precipitation amount is 131 mm (5.2 in) spread over 12 days.

October Precipitation Trends in Lemont

The chart displays monthly precipitation patterns in Lemont, 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 Lemont, October typically receives around 131 mm (5.2 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec61638912015615111691851315754
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Lemont

In Lemont in October, humidity is 82%. With an average temperature of 12°C (55°F), this humidity feels like a heavy blanket wrapping around you, making even a simple walk feel laborious and sticky, which can be quite exhausting for traveling.

October Average Humidity in Lemont

This chart illustrates the average monthly humidity levels in Lemont, 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 Lemont is approximately 82%, 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 October generated using information from the Copernicus Climate Change Service.

October UV Index in Lemont

In Lemont 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 Lemont, you can refer to this Hourly UV Index in Lemont.

Maximum UV Index Levels in Lemont for October

The chart shows the monthly maximum UV Index (UVI) for Lemont 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 Lemont typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098642
Data source: Lemont 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 Lemont Compares to Other Months

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

This table compares monthly weather conditions in Lemont, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)61 mm (2.4 inches)82%moderate
February Weather-2°C (28°F)63 mm (2.5 inches)83%moderate
March Weather4°C (40°F)89 mm (3.5 inches)84%high
April Weather9°C (49°F)120 mm (4.7 inches)85%very high
May Weather16°C (61°F)156 mm (6.1 inches)79%very high
June Weather22°C (72°F)151 mm (6.0 inches)82%very high
July Weather24°C (76°F)116 mm (4.6 inches)80%very high
August Weather23°C (73°F)91 mm (3.6 inches)81%very high
September Weather20°C (68°F)85 mm (3.4 inches)80%very high
October Weather12°C (55°F)131 mm (5.2 inches)82%high
November Weather4°C (39°F)57 mm (2.3 inches)88%moderate
December Weather1°C (33°F)54 mm (2.1 inches)84%low

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