October Weather in Alton, United States

Last updated: June 24, 2025

In October, the average temperature in Alton, United States hovers around 9°C (49°F), with minimums plummeting to -10°C (14°F) and maximums soaring to 31°C (87°F). Expect 82 mm (3.2 in) of precipitation over approximately 9 days, contributing to an average humidity level of 77%. Stay prepared for diverse weather as you explore this charming destination!

October Temperature in Alton

In October in Alton, the average temperature is 9°C (49°F). The maximum can reach 31°C (87°F), and the minimum can be as low as -10°C (14°F). Be prepared for a wide range of temperatures when traveling during this time.

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 9°C (49°F), with highs reaching up to 31°C (87°F) and lows dropping to around -10°C (14°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 82 mm (3.2 in), occurring over a span of 9 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 82 mm (3.2 inches) of precipitation spread over approximately 9 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 77%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that seeps into your bones, making outdoor explorations feel colder and more uncomfortable than the thermometer suggests.

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 77%, 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	-6°C (21°F)	26 mm (1.0 inches)	80%	low
February Weather	-6°C (21°F)	32 mm (1.3 inches)	84%	moderate
March Weather	2°C (36°F)	72 mm (2.8 inches)	75%	moderate
April Weather	8°C (46°F)	95 mm (3.7 inches)	79%	very high
May Weather	15°C (60°F)	140 mm (5.5 inches)	74%	very high
June Weather	23°C (73°F)	114 mm (4.5 inches)	81%	extreme
July Weather	24°C (76°F)	72 mm (2.8 inches)	82%	very high
August Weather	22°C (72°F)	100 mm (3.9 inches)	80%	very high
September Weather	19°C (66°F)	101 mm (4.0 inches)	75%	very high
October Weather	9°C (49°F)	82 mm (3.2 inches)	77%	moderate
November Weather	2°C (36°F)	28 mm (1.1 inches)	85%	moderate
December Weather	-3°C (27°F)	39 mm (1.5 inches)	83%	moderate