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May Weather in Bethalto, United States

Last updated: June 24, 2025

In Bethalto, United States, the average temperature for May hovers around 19°C (67°F), providing a mild and pleasant climate. However, be prepared for a temperature range that can dip to a chilly 3°C (38°F) and soar up to a sweltering 35°C (95°F). Rain is not uncommon, with an average precipitation of 156 mm (6.1 in) spread over about 13 days. Humidity levels are high, averaging 82%, adding an element of tropical warmth to the atmosphere.

May Temperature in Bethalto

In May in Bethalto, the average temperature is 19°C (67°F). Maximums can reach 35°C (95°F), while minimums can dip as low as 3°C (38°F). This variability makes Bethalto a great destination for travelers seeking a mix of warm and cooler weather experiences.

May Weather in Bethalto: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Bethalto, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bethalto, May typically has an average temperature of 19°C (67°F), with highs reaching up to 35°C (95°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec313446546776797672594338
Data source: Temperature data for Bethalto 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.

May Precipitation in Bethalto

In Bethalto in May, the precipitation amount is 156 mm (6.1 in) spread over 13 days.

May Precipitation Trends in Bethalto

The chart displays monthly precipitation patterns in Bethalto, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Bethalto, May typically receives around 156 mm (6.1 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec7580133132156111100120641037557
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Bethalto

In Bethalto in May humidity is 82%. With an average temperature of 19°C (67°F), this humidity feels like a heavy blanket wrapping around you, making each step feel sluggish and the air thick as you explore the sights.

May Average Humidity in Bethalto

This chart illustrates the average monthly humidity levels in Bethalto, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Bethalto is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%80%82%83%81%80%76%76%85%86%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Bethalto

In Bethalto in May, 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 Bethalto.

Maximum UV Index Levels in Bethalto for May

The chart shows the monthly maximum UV Index (UVI) for Bethalto in May, 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 May, the maximum UV index in Bethalto typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111199643
Data source: Bethalto May 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 May Weather in Bethalto Compares to Other Months

Weather in Bethalto varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Bethalto, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Bethalto, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)75 mm (3.0 inches)82%moderate
February Weather1°C (35°F)80 mm (3.1 inches)80%moderate
March Weather8°C (46°F)133 mm (5.2 inches)80%high
April Weather12°C (55°F)132 mm (5.2 inches)80%very high
May Weather19°C (67°F)156 mm (6.1 inches)82%very high
June Weather25°C (77°F)111 mm (4.4 inches)83%extreme
July Weather26°C (79°F)100 mm (3.9 inches)81%extreme
August Weather24°C (76°F)120 mm (4.7 inches)80%very high
September Weather22°C (72°F)64 mm (2.5 inches)76%very high
October Weather15°C (59°F)102 mm (4.0 inches)76%high
November Weather6°C (44°F)75 mm (2.9 inches)85%moderate
December Weather3°C (38°F)57 mm (2.2 inches)86%moderate

Compare Bethalto's Climate with Cities Worldwide