July Weather in Alton, United States

Last updated: June 24, 2025

In Alton, United States, the average temperature in July hovers around 21°C (70°F). Expect temperatures to range from a cool 8°C (47°F) to a warm 35°C (95°F). During this month, the region experiences an average precipitation of 96 mm (3.8 in) over 12 days, with humidity levels reaching 74%. Enjoy your time amidst these varied weather conditions!

July Temperature in Alton

In July in Alton, the average temperature is 21°C (70°F). Maximum temperatures can reach 35°C (95°F), while minimum temperatures can drop as low as 8°C (47°F). Overall, this makes it a perfect time for travelers seeking mild weather and the opportunity to enjoy outdoor activities.

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 21°C (70°F), with highs reaching up to 35°C (95°F) and lows dropping to around 8°C (47°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 96 mm (3.8 in) spread over a duration of 12 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 96 mm (3.8 inches) of precipitation spread over approximately 12 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

July Humidity in Alton

In Alton in July humidity is 74%. With an average temperature of 21°C (70°F), this humidity feels like a warm, moist embrace, making outdoor activities both invigorating and slightly draining, so travelers should stay hydrated and take breaks often.

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 74%, 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 is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high 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	-6°C (21°F)	90 mm (3.6 inches)	88%	low
February Weather	-5°C (23°F)	82 mm (3.2 inches)	88%	moderate
March Weather	-1°C (30°F)	72 mm (2.8 inches)	85%	moderate
April Weather	6°C (43°F)	125 mm (4.9 inches)	81%	high
May Weather	12°C (54°F)	98 mm (3.9 inches)	76%	very high
June Weather	18°C (64°F)	88 mm (3.5 inches)	74%	very high
July Weather	21°C (70°F)	96 mm (3.8 inches)	74%	very high
August Weather	20°C (69°F)	78 mm (3.1 inches)	74%	very high
September Weather	16°C (61°F)	76 mm (3.0 inches)	77%	high
October Weather	10°C (50°F)	119 mm (4.7 inches)	82%	moderate
November Weather	2°C (36°F)	119 mm (4.7 inches)	85%	moderate
December Weather	-4°C (26°F)	116 mm (4.6 inches)	84%	low