nomadseason

October Weather in Saint Charles, United States

Last updated: June 24, 2025

In Saint Charles, United States, the average temperature in October hovers around 12°C (53°F), with extremes ranging from a chilly -6°C (22°F) to a warm 31°C (88°F). During this month, you can expect about 134 mm (5.3 in) of precipitation spread over 11 days, contributing to an average humidity level of 75%. Stay prepared for a mix of weather!

October Temperature in Saint Charles

In October in Saint Charles, the average temperature is 12°C (53°F). The maximum can reach 31°C (88°F) and the minimum can be as low as -6°C (22°F). Travelers should be prepared for a wide range of temperatures, so packing layers is recommended.

October Weather in Saint Charles: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Saint Charles, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Charles, October typically has an average temperature of 12°C (53°F), with highs reaching up to 31°C (88°F) and lows dropping to around -6°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec232540506375787469533932
Data source: Temperature data for Saint Charles generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

October Precipitation in Saint Charles

In Saint Charles in October, the precipitation amount is 134 mm (5.3 in) spread over 11 days.

October Precipitation Trends in Saint Charles

The chart displays monthly precipitation patterns in Saint Charles, 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 Saint Charles, October typically receives around 134 mm (5.3 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec4139856916311769761171344336
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

October Humidity in Saint Charles

In Saint Charles in October, humidity is 75%. With an average temperature of 12°C (53°F), this humidity feels like a damp chill that clings to your skin, making leisurely exploration feel sluggish and heavy, perhaps leaving you yearning for cozy indoor retreats.

October Average Humidity in Saint Charles

This chart illustrates the average monthly humidity levels in Saint Charles, 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 Saint Charles is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Saint Charles

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

Maximum UV Index Levels in Saint Charles for October

The chart shows the monthly maximum UV Index (UVI) for Saint Charles 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 Saint Charles typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098643
Data source: Saint Charles 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 Saint Charles Compares to Other Months

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

This table compares monthly weather conditions in Saint Charles, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)41 mm (1.6 inches)78%moderate
February Weather-4°C (25°F)39 mm (1.6 inches)80%moderate
March Weather5°C (41°F)85 mm (3.3 inches)77%high
April Weather10°C (50°F)69 mm (2.7 inches)77%very high
May Weather17°C (63°F)163 mm (6.4 inches)77%very high
June Weather24°C (75°F)117 mm (4.6 inches)81%extreme
July Weather25°C (78°F)69 mm (2.7 inches)81%very high
August Weather24°C (75°F)76 mm (3.0 inches)77%very high
September Weather20°C (69°F)117 mm (4.6 inches)73%very high
October Weather12°C (53°F)134 mm (5.3 inches)75%high
November Weather4°C (39°F)43 mm (1.7 inches)85%moderate
December Weather0°C (32°F)36 mm (1.4 inches)83%moderate

Compare Saint Charles's Climate with Cities Worldwide