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May Weather in Saint Clair, United States

Last updated: June 24, 2025

In May, the average temperature in Saint Clair, United States is a pleasant 19°C (66°F). However, you might experience a minimum of 4°C (39°F) and a maximum of 33°C (92°F). Be prepared for some rain, as the area sees an average precipitation of 154 mm (6.1 in) over 14 days. With an average humidity level of 82%, it's a time when the air feels notably moist.

May Temperature in Saint Clair

In May in Saint Clair, the average temperature is 19°C (66°F). Maximums can reach 33°C (92°F), while minimums can drop as low as 4°C (39°F). Be sure to pack a mix of clothing to enjoy both warm days and cooler nights during your travels!

May Weather in Saint Clair: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Saint Clair, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Clair, May typically has an average temperature of 19°C (66°F), with highs reaching up to 33°C (92°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec333647556675797672594540
Data source: Temperature data for Saint Clair 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 Saint Clair

In Saint Clair in May, the total precipitation amount is 154 mm (6.1 in) over a period of 14 days.

May Precipitation Trends in Saint Clair

The chart displays monthly precipitation patterns in Saint Clair, 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 Saint Clair, May typically receives around 154 mm (6.1 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec76841261301548798131591086958
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Saint Clair

In Saint Clair in May humidity is 82%. With an average temperature of 19°C (66°F), this humidity feels like a warm blanket wrapping around you, making it slightly uncomfortable for traveling as you might find yourself constantly seeking shade or a cool breeze.

May Average Humidity in Saint Clair

This chart illustrates the average monthly humidity levels in Saint Clair, 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 Saint Clair 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 Saint Clair

In Saint Clair 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 Saint Clair.

Maximum UV Index Levels in Saint Clair for May

The chart shows the monthly maximum UV Index (UVI) for Saint Clair 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 Saint Clair typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109753
Data source: Saint Clair 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 Saint Clair Compares to Other Months

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

This table compares monthly weather conditions in Saint Clair, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)76 mm (3.0 inches)82%moderate
February Weather2°C (37°F)84 mm (3.3 inches)80%moderate
March Weather9°C (48°F)126 mm (5.0 inches)80%high
April Weather13°C (55°F)130 mm (5.1 inches)80%very high
May Weather19°C (66°F)154 mm (6.1 inches)82%very high
June Weather24°C (76°F)87 mm (3.4 inches)83%extreme
July Weather26°C (79°F)98 mm (3.8 inches)81%extreme
August Weather24°C (76°F)131 mm (5.1 inches)80%very high
September Weather22°C (72°F)59 mm (2.3 inches)76%very high
October Weather15°C (59°F)108 mm (4.3 inches)76%high
November Weather7°C (45°F)69 mm (2.7 inches)85%moderate
December Weather4°C (40°F)58 mm (2.3 inches)86%moderate

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