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August Weather in St. Marys, United States

Last updated: June 24, 2025

In August, the average temperature in St. Marys, United States reaches a warm 27°C (82°F), with minimums dipping to 23°C (73°F) and maximums soaring to 34°C (94°F). Be prepared for a good amount of rain, as the region receives approximately 172 mm (6.8 in) over 25 days. With an average humidity of 82%, it's essential to stay hydrated and enjoy the tropical vibes!

August Temperature in St. Marys

In August in St. Marys, the average temperature is 27°C (82°F). Maximums can reach 34°C (94°F), and minimums can be as low as 23°C (73°F). This climate makes it an ideal destination for travelers seeking warm weather and plenty of sunshine.

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

The chart illustrates August temperature patterns in St. Marys, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In St. Marys, August typically has an average temperature of 27°C (82°F), with highs reaching up to 34°C (94°F) and lows dropping to around 23°C (73°F).
JanFebMarAprMayJunJulAugSepOctNovDec566064697579818180756459
Data source: Temperature data for St. 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 St. Marys

In St. Marys, in August, the precipitation amount is 172 mm (6.8 in) over a span of 25 days.

August Precipitation Trends in St. Marys

The chart displays monthly precipitation patterns in St. 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 St. Marys, August typically receives around 172 mm (6.8 inches) of precipitation spread over approximately 25 days.
JanFebMarAprMayJunJulAugSepOctNovDec5171446680145170172155788086
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in St. Marys

In St. Marys in August humidity is 82%. With an average temperature of 27°C (82°F), this humidity feels like stepping into a warm, thick blanket, making outdoor activities quite uncomfortable and travel feel a bit sluggish.

August Average Humidity in St. Marys

This chart illustrates the average monthly humidity levels in St. 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 St. Marys is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%79%78%73%72%74%82%82%83%79%82%85%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in St. Marys

In St. Marys in August, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in St. Marys.

Maximum UV Index Levels in St. Marys for August

The chart shows the monthly maximum UV Index (UVI) for St. 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 St. Marys typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579101111111110864
Data source: St. 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 St. Marys Compares to Other Months

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

This table compares monthly weather conditions in St. Marys, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather13°C (56°F)51 mm (2.0 inches)84%moderate
February Weather16°C (61°F)71 mm (2.8 inches)79%high
March Weather18°C (64°F)44 mm (1.7 inches)78%very high
April Weather21°C (69°F)66 mm (2.6 inches)72%very high
May Weather24°C (75°F)80 mm (3.2 inches)72%extreme
June Weather26°C (80°F)145 mm (5.7 inches)74%extreme
July Weather27°C (81°F)170 mm (6.7 inches)82%extreme
August Weather27°C (82°F)172 mm (6.8 inches)82%extreme
September Weather26°C (80°F)155 mm (6.1 inches)83%very high
October Weather24°C (75°F)78 mm (3.1 inches)79%very high
November Weather18°C (64°F)80 mm (3.1 inches)82%high
December Weather15°C (59°F)86 mm (3.4 inches)85%moderate

Compare St. Marys's Climate with Cities Worldwide