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April Weather in Saint Marys, United States

Last updated: June 24, 2025

In Saint Marys, United States, the average temperature in April hovers around 8°C (46°F). Variability is the norm, with minimums plunging to -6°C (22°F) and highs soaring up to 27°C (80°F). Visitors should be prepared for 124 mm (4.9 in) of precipitation spread over 16 days, creating an atmosphere of 88% humidity that adds to the region's character.

April Temperature in Saint Marys

In April in Saint Marys, the average temperature is 8°C (46°F). Maximums can reach 27°C (80°F), while minimums can dip as low as -6°C (22°F). This varied climate makes Saint Marys an exciting destination for travelers looking to experience both warmth and chilly moments during their visit.

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

The chart illustrates April 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, April typically has an average temperature of 8°C (46°F), with highs reaching up to 27°C (80°F) and lows dropping to around -6°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec252936465765706963523831
Data source: Temperature data for Saint Marys 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 Saint Marys

In Saint Marys in April, the precipitation amount is 124 mm (4.9 in) occurring over a period of 16 days.

April Precipitation Trends in Saint Marys

The chart displays monthly precipitation patterns in Saint Marys, 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 Saint Marys, April typically receives around 124 mm (4.9 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec9010794124144123117941111259498
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Saint Marys

In Saint Marys in April, humidity is 88%. With an average temperature of 8°C (46°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration feel much more uncomfortable than the temperature alone would suggest.

April Average Humidity in Saint Marys

This chart illustrates the average monthly humidity levels in Saint Marys, 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 Saint Marys is approximately 88%, 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 April generated using information from the Copernicus Climate Change Service.

April UV Index in Saint Marys

In Saint Marys in April, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Saint Marys.

Maximum UV Index Levels in Saint Marys for April

The chart shows the monthly maximum UV Index (UVI) for Saint Marys 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 Saint Marys typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Saint Marys 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 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 April’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 April’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

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