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June Weather in Alton, United States

Last updated: June 24, 2025

In Alton, United States, the average temperature in June hovers around 24°C (76°F). However, be prepared for a range, as temperatures can dip to a chilly 11°C (52°F) or soar to a sizzling 38°C (101°F). Expect approximately 85 mm (3.3 in) of precipitation spread across 10 days during the month, coupled with a high average humidity of 83%. Stay hydrated and enjoy the vibrant climate!

June Temperature in Alton

In June in Alton, the average temperature is 24°C (76°F). Maximums can reach 38°C (101°F), and minimums can drop as low as 11°C (52°F). This range makes it an ideal time for travelers to enjoy diverse activities, from sunbathing to exploring cooler attractions.

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 24°C (76°F), with highs reaching up to 38°C (101°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec363950566775807773604642
Data source: Temperature data for Alton generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

June Precipitation in Alton

In Alton in June, the precipitation amount is 85 mm (3.3 in) over the course 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 85 mm (3.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec851111481641818580107621217781
Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.
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June Humidity in Alton

In Alton in June, humidity is 83%. With an average temperature of 24°C (76°F), this humidity feels like a thick blanket enveloping you, making every step feel heavier and possibly causing travelers to sweat more quickly, prompting frequent breaks in shaded areas or the search for refreshing beverages.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%81%80%80%83%83%76%69%68%72%83%87%
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.
JanFebMarAprMayJunJulAugSepOctNovDec36710111111109753
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.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)85 mm (3.3 inches)83%moderate
February Weather4°C (40°F)111 mm (4.4 inches)81%high
March Weather10°C (50°F)148 mm (5.8 inches)80%high
April Weather13°C (56°F)164 mm (6.5 inches)80%very high
May Weather19°C (67°F)181 mm (7.1 inches)83%extreme
June Weather24°C (76°F)85 mm (3.3 inches)83%extreme
July Weather26°C (80°F)80 mm (3.2 inches)76%extreme
August Weather25°C (77°F)106 mm (4.2 inches)69%very high
September Weather23°C (73°F)62 mm (2.4 inches)68%very high
October Weather16°C (60°F)121 mm (4.8 inches)72%high
November Weather8°C (47°F)77 mm (3.0 inches)83%moderate
December Weather6°C (42°F)81 mm (3.2 inches)86%moderate

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