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April Weather in Saint Marys, United States

Last updated: June 24, 2025

In April, the average temperature in Saint Marys, United States hovers around 10°C (51°F), offering a mild climate for visitors. However, be prepared for temperature fluctuations, as it can dip to a chilly -9°C (16°F) or rise as high as 29°C (84°F). Expect a precipitation level of 98 mm (3.9 in) spread over approximately 13 days, combined with an average humidity of 87%, creating a uniquely cozy atmosphere.

April Temperature in Saint Marys

In April in Saint Marys, the average temperature is 10°C (51°F), with maximums reaching 29°C (84°F) and minimums dipping as low as -9°C (16°F). Expect a wide range of temperatures, so be prepared for both warm days and chilly nights while traveling.

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 10°C (51°F), with highs reaching up to 29°C (84°F) and lows dropping to around -9°C (16°F).
JanFebMarAprMayJunJulAugSepOctNovDec293241516372767368574135
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 98 mm (3.9 in) over a span of 13 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 98 mm (3.9 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec74931029813012510910973968569
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 87%. With an average temperature of 10°C (51°F), this humidity feels like a heavy blanket enveloping you, making outdoor activities uncomfortable and sticky, and often requiring frequent breaks to stay hydrated and cool.

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 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%87%88%81%82%81%78%78%82%89%86%
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-2°C (30°F)74 mm (2.9 inches)88%moderate
February Weather0°C (32°F)93 mm (3.7 inches)87%moderate
March Weather5°C (42°F)102 mm (4.0 inches)87%high
April Weather10°C (51°F)98 mm (3.9 inches)87%very high
May Weather17°C (63°F)130 mm (5.1 inches)81%very high
June Weather22°C (72°F)125 mm (4.9 inches)82%very high
July Weather24°C (76°F)109 mm (4.3 inches)81%very high
August Weather23°C (73°F)109 mm (4.3 inches)78%very high
September Weather20°C (69°F)73 mm (2.9 inches)78%very high
October Weather14°C (57°F)96 mm (3.8 inches)82%high
November Weather5°C (42°F)85 mm (3.4 inches)89%moderate
December Weather2°C (35°F)69 mm (2.7 inches)86%low

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