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April Weather in Alton, United States

Last updated: June 24, 2025

In Alton, United States, the average temperature in April hovers around 13°C (56°F). During this month, temperatures can dip as low as -4°C (25°F) or rise to a warm 30°C (87°F). Expect an average precipitation of 164 mm (6.5 in) over approximately 12 days, with humidity levels averaging a comfortable 80%.

April Temperature in Alton

In April in Alton, the average temperature is 13°C (56°F). The maximum can reach 30°C (87°F), while the minimum can drop as low as -4°C (25°F). Be sure to pack for a range of weather conditions if you're planning to travel during this time.

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

The chart illustrates April 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, April typically has an average temperature of 13°C (56°F), with highs reaching up to 30°C (87°F) and lows dropping to around -4°C (25°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.

April Precipitation in Alton

In Alton in April, the precipitation amount is 164 mm (6.5 in) over the course of 12 days.

April Precipitation Trends in Alton

The chart displays monthly precipitation patterns in Alton, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Alton, April typically receives around 164 mm (6.5 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec851111481641818580107621217781
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Alton

In Alton in April humidity is 80%. With average temperature 13°C (56°F) this humidity feels like a damp chill that seeps into your bones, making outdoor exploration more challenging and necessitating layered clothing for comfort.

April Average Humidity in Alton

This chart illustrates the average monthly humidity levels in Alton, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Alton is approximately 80%, 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 April generated using information from the Copernicus Climate Change Service.

April UV Index in Alton

In Alton in April, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Alton.

Maximum UV Index Levels in Alton for April

The chart shows the monthly maximum UV Index (UVI) for Alton in April, 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 April, the maximum UV index in Alton typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710111111109753
Data source: Alton April 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 April 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 April’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 April’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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