October Weather in Alton, United States

Last updated: June 24, 2025

In October, the average temperature in Alton, United States hovers around 16°C (60°F). While the mercury can dip as low as -4°C (24°F), it can also soar to a scorching 33°C (92°F). Expect some rainfall, with 121 mm (4.8 in) anticipated over about 10 days of the month. Additionally, the average humidity stands at a comfortable 72%, ensuring a balmy atmosphere for your adventures.

October Temperature in Alton

In October in Alton, the average temperature is 16°C (60°F). Maximum temperatures can reach 33°C (92°F), while minimums can drop as low as -4°C (24°F). Be prepared for a wide range of weather conditions if you're planning to visit 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 16°C (60°F), with highs reaching up to 33°C (92°F) and lows dropping to around -4°C (24°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 precipitation amount is 121 mm (4.8 in) spread over a period of 10 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 121 mm (4.8 inches) of precipitation spread over approximately 10 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 72%. With an average temperature of 16°C (60°F), this humidity feels like a warm, damp blanket enveloping you as you travel, making it essential to stay hydrated and take breaks in shaded areas to enjoy your journey comfortably.

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 72%, 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 is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, 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 7, which falls under the high 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	2°C (36°F)	85 mm (3.3 inches)	83%	moderate
February Weather	4°C (40°F)	111 mm (4.4 inches)	81%	high
March Weather	10°C (50°F)	148 mm (5.8 inches)	80%	high
April Weather	13°C (56°F)	164 mm (6.5 inches)	80%	very high
May Weather	19°C (67°F)	181 mm (7.1 inches)	83%	extreme
June Weather	24°C (76°F)	85 mm (3.3 inches)	83%	extreme
July Weather	26°C (80°F)	80 mm (3.2 inches)	76%	extreme
August Weather	25°C (77°F)	106 mm (4.2 inches)	69%	very high
September Weather	23°C (73°F)	62 mm (2.4 inches)	68%	very high
October Weather	16°C (60°F)	121 mm (4.8 inches)	72%	high
November Weather	8°C (47°F)	77 mm (3.0 inches)	83%	moderate
December Weather	6°C (42°F)	81 mm (3.2 inches)	86%	moderate