October Weather in Alton, United States

Last updated: June 24, 2025

In October, the average temperature in Alton, United States hovers around 11°C (52°F). Visitors can expect a temperature range, with minimums dipping to -2°C (29°F) and maximums soaring to 26°C (80°F). The region experiences approximately 119 mm (4.7 in) of precipitation spread over 11 days, complemented by an average humidity of 78%. Prepare accordingly to enjoy your time!

October Temperature in Alton

In October in Alton, the average temperature is 11°C (52°F). The maximum can reach 26°C (80°F), and the minimum can be as low as -2°C (29°F). This makes it a great time for travelers to experience a diverse and pleasant range of weather, perfect for outdoor activities.

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

The chart illustrates October temperature patterns in Alton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alton, October typically has an average temperature of 11°C (52°F), with highs reaching up to 26°C (80°F) and lows dropping to around -2°C (29°F).

Data source: Temperature data for Alton generated using information from the Copernicus Climate Change Service.

October Precipitation in Alton

In Alton in October, the total precipitation amount is 119 mm (4.7 in), which occurs over the course of 11 days.

October Precipitation Trends in Alton

The chart displays monthly precipitation patterns in Alton, 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 Alton, October typically receives around 119 mm (4.7 inches) of precipitation spread over approximately 11 days.

Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

October Humidity in Alton

In Alton in October humidity is 78%. With an average temperature of 11°C (52°F), this humidity feels like a damp blanket wrapping around you, making outdoor activities somewhat uncomfortable and travel more challenging as you navigate the moist air.

October Average Humidity in Alton

This chart illustrates the average monthly humidity levels in Alton, 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 Alton is approximately 78%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Alton

In Alton in October, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Alton.

Maximum UV Index Levels in Alton for October

The chart shows the monthly maximum UV Index (UVI) for Alton 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 Alton typically reaches 5, which falls under the moderate exposure category.

Data source: Alton 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 Alton Compares to Other Months

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

This table compares monthly weather conditions in Alton, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (24°F)	75 mm (2.9 inches)	86%	moderate
February Weather	-3°C (27°F)	84 mm (3.3 inches)	84%	moderate
March Weather	0°C (33°F)	77 mm (3.0 inches)	82%	moderate
April Weather	7°C (44°F)	128 mm (5.0 inches)	80%	very high
May Weather	13°C (56°F)	74 mm (2.9 inches)	72%	very high
June Weather	19°C (66°F)	87 mm (3.4 inches)	72%	very high
July Weather	22°C (72°F)	134 mm (5.3 inches)	67%	very high
August Weather	21°C (71°F)	74 mm (2.9 inches)	66%	very high
September Weather	18°C (64°F)	66 mm (2.6 inches)	71%	high
October Weather	11°C (52°F)	119 mm (4.7 inches)	78%	moderate
November Weather	3°C (39°F)	110 mm (4.3 inches)	84%	moderate
December Weather	-2°C (29°F)	119 mm (4.7 inches)	81%	low