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August Weather in Saint Marys, United States

Last updated: June 24, 2025

In August, the average temperature in Saint Marys, United States is 25°C (77°F). Expect a comfortable range where the minimum dips to 12°C (54°F), while the maximum can soar up to 37°C (99°F). Be prepared for some rain, as 130 mm (5.1 in) of precipitation is likely to occur over approximately 10 days. With an average humidity level of 78%, it's wise to stay hydrated and enjoy the warm, inviting atmosphere!

August Temperature in Saint Marys

In August in Saint Marys, the average temperature is 25°C (77°F). Maximums can reach 37°C (99°F) and minimums can be as low as 12°C (54°F). Travelers should prepare for warm days and cooler evenings while enjoying a pleasant climate.

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

The chart illustrates August 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, August typically has an average temperature of 25°C (77°F), with highs reaching up to 37°C (99°F) and lows dropping to around 12°C (54°F).
JanFebMarAprMayJunJulAugSepOctNovDec313246546577817772564437
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.

August Precipitation in Saint Marys

In Saint Marys in August, the precipitation amount is 130 mm (5.1 in) over a period of 10 days.

August Precipitation Trends in Saint Marys

The chart displays monthly precipitation patterns in Saint Marys, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Saint Marys, August typically receives around 130 mm (5.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec382793782059690130801093330
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Saint Marys

In Saint Marys in August, humidity is 78%. With an average temperature of 25°C (77°F), this humidity feels like walking through a warm, damp blanket, making travel feel a bit more exhausting and sticky as you navigate the sights.

August Average Humidity in Saint Marys

This chart illustrates the average monthly humidity levels in Saint Marys, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Saint Marys is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%78%70%73%82%82%81%78%71%71%81%84%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Saint Marys

In Saint Marys in August, 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 August

The chart shows the monthly maximum UV Index (UVI) for Saint Marys in August, 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 August, the maximum UV index in Saint Marys typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
Data source: Saint Marys August 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 August 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 August’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 August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)38 mm (1.5 inches)76%moderate
February Weather0°C (32°F)27 mm (1.1 inches)77%moderate
March Weather8°C (46°F)93 mm (3.7 inches)70%high
April Weather12°C (54°F)78 mm (3.1 inches)73%very high
May Weather19°C (66°F)205 mm (8.1 inches)82%very high
June Weather25°C (78°F)96 mm (3.8 inches)82%extreme
July Weather27°C (81°F)90 mm (3.6 inches)81%extreme
August Weather25°C (77°F)130 mm (5.1 inches)78%very high
September Weather22°C (72°F)80 mm (3.1 inches)71%very high
October Weather13°C (57°F)109 mm (4.3 inches)71%high
November Weather6°C (44°F)32 mm (1.3 inches)81%moderate
December Weather3°C (37°F)30 mm (1.2 inches)84%moderate

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