nomadseason

May Weather in Saint Marys, United States

Last updated: June 24, 2025

In May, the average temperature in Saint Marys, United States hovers around 14°C (58°F), with a wide range that can dip to a chilly -4°C (26°F) or soar to a warm 30°C (85°F). This month experiences 144 mm (5.7 in) of precipitation spread over approximately 16 days, contributing to an average humidity level of 80%.

May Temperature in Saint Marys

In May in Saint Marys, the average temperature is 14°C (58°F). Maximums can reach 30°C (85°F) and minimums can be as low as -4°C (26°F). Be prepared for a wide range of temperatures and pack accordingly for your travel adventures!

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

The chart illustrates May temperature patterns in Saint Marys, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Marys, May typically has an average temperature of 14°C (58°F), with highs reaching up to 30°C (85°F) and lows dropping to around -4°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec252936465765706963523831
Data source: Temperature data for Saint Marys generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Saint Marys

In Saint Marys in May, the total precipitation amount is 144 mm (5.7 in), which occurs over a span of 16 days.

May Precipitation Trends in Saint Marys

The chart displays monthly precipitation patterns in Saint Marys, 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 Marys, May typically receives around 144 mm (5.7 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec9010794124144123117941111259498
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

May Humidity in Saint Marys

In Saint Marys in May humidity is 80%. With an average temperature of 14°C (58°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities sweltering and uncomfortable for travel.

May Average Humidity in Saint Marys

This chart illustrates the average monthly humidity levels in Saint Marys, 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 Marys is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%89%88%80%79%74%64%67%81%89%88%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Saint Marys

In Saint Marys 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 Marys.

Maximum UV Index Levels in Saint Marys for May

The chart shows the monthly maximum UV Index (UVI) for Saint Marys 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 Marys typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Saint Marys 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 Marys Compares to Other Months

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

This table compares monthly weather conditions in Saint Marys, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)90 mm (3.5 inches)89%moderate
February Weather-2°C (29°F)107 mm (4.2 inches)90%moderate
March Weather2°C (36°F)94 mm (3.7 inches)89%high
April Weather8°C (46°F)124 mm (4.9 inches)88%very high
May Weather14°C (58°F)144 mm (5.7 inches)80%very high
June Weather19°C (66°F)123 mm (4.9 inches)79%very high
July Weather21°C (71°F)117 mm (4.6 inches)74%very high
August Weather20°C (69°F)94 mm (3.7 inches)64%very high
September Weather17°C (63°F)111 mm (4.4 inches)67%very high
October Weather11°C (53°F)125 mm (4.9 inches)81%high
November Weather3°C (38°F)94 mm (3.7 inches)89%moderate
December Weather0°C (32°F)98 mm (3.9 inches)88%low

Compare Saint Marys's Climate with Cities Worldwide