July Weather in Alton, United States

Last updated: June 24, 2025

In July, the average temperature in Alton, United States hovers around 26°C (80°F), providing a pleasant experience for locals and visitors alike. Expect minimum temperatures to dip to 16°C (61°F), while the heat can peak at a scorching 38°C (100°F). Prepare for a bit of rain, with precipitation averaging 80 mm (3.2 in) over the course of 11 days. With an average humidity of 76%, the atmosphere is often warm and inviting.

July Temperature in Alton

In July in Alton, the average temperature is 26°C (80°F). Maximums can reach 38°C (100°F) and minimums can be as low as 16°C (61°F). This makes Alton a perfect destination for travelers seeking warm weather and outdoor activities during this time.

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

The chart illustrates July 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, July typically has an average temperature of 26°C (80°F), with highs reaching up to 38°C (100°F) and lows dropping to around 16°C (61°F).

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

July Precipitation in Alton

In Alton in July, the precipitation amount is 80 mm (3.2 in) spread over 11 days.

July Precipitation Trends in Alton

The chart displays monthly precipitation patterns in Alton, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Alton, July typically receives around 80 mm (3.2 inches) of precipitation spread over approximately 11 days.

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

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Millimeters (mm) Inches (in)

July Humidity in Alton

In Alton in July humidity is 76%. With an average temperature of 26°C (80°F), this humidity feels like a heavy blanket enveloping you, making travel feel stifling and exhausting as you navigate the sticky air and sweat-drenched clothes.

July Average Humidity in Alton

This chart illustrates the average monthly humidity levels in Alton, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Alton is approximately 76%, offering insight into how humid the weather typically is during this month.

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

July UV Index in Alton

In Alton in July, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Alton.

Maximum UV Index Levels in Alton for July

The chart shows the monthly maximum UV Index (UVI) for Alton in July, 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 July, the maximum UV index in Alton typically reaches 11, which falls under the extreme exposure category.

Data source: Alton July 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 July 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 July’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 July’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