June Weather in Alton, United States

Last updated: June 24, 2025

In June, the average temperature in Alton, United States is a pleasant 23°C (73°F), with a comfortable 81% humidity. However, temperatures can range from a cool 7°C (45°F) on the lower end to a warm 35°C (95°F) at their peak. Be prepared for some rain, as 114 mm (4.5 in) of precipitation can be expected over approximately 10 days.

June Temperature in Alton

In June in Alton, the average temperature is 23°C (73°F), with maximums reaching 35°C (95°F) and minimums dipping as low as 7°C (45°F). It's advisable to pack both light clothing for the warmth and warmer layers for the cooler evenings during your travels.

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

The chart illustrates June 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, June typically has an average temperature of 23°C (73°F), with highs reaching up to 35°C (95°F) and lows dropping to around 7°C (45°F).

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

June Precipitation in Alton

In Alton in June, the precipitation amount is 114 mm (4.5 in) over a period of 10 days.

June Precipitation Trends in Alton

The chart displays monthly precipitation patterns in Alton, with values for each month alongside June’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how June’s conditions compare to those of other months. In Alton, June typically receives around 114 mm (4.5 inches) of precipitation spread over approximately 10 days.

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

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Millimeters (mm) Inches (in)

June Humidity in Alton

In Alton in June, humidity is 81%. With an average temperature of 23°C (73°F), this humidity feels like a heavy blanket wrapping around you, making every step feel more laborious while traveling and causing you to constantly seek out shade or a cool breeze for relief.

June Average Humidity in Alton

This chart illustrates the average monthly humidity levels in Alton, with June’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In June, average humidity in Alton is approximately 81%, offering insight into how humid the weather typically is during this month.

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

June UV Index in Alton

In Alton in June, 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 June

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

Data source: Alton June 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 June 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 June’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 June’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