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August Weather in Johnstown, United States

Last updated: June 24, 2025

In August, the average temperature in Johnstown, United States is a pleasant 23°C (73°F), with minimums dipping to 11°C (51°F) and maximums soaring up to 32°C (90°F). Expect a fair amount of rain, with 76 mm (3.0 in) of precipitation spread over 12 days. The humidity averages around 78%, ensuring a warm, tropical feel throughout the month.

August Temperature in Johnstown

In August in Johnstown, the average temperature is 23°C (73°F), with maximums reaching up to 32°C (90°F) and minimums dropping to as low as 11°C (51°F). This moderate climate makes it an ideal time for travelers to explore and enjoy outdoor activities.

August Weather in Johnstown: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Johnstown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Johnstown, August typically has an average temperature of 23°C (73°F), with highs reaching up to 32°C (90°F) and lows dropping to around 11°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec303341516371757368574136
Data source: Temperature data for Johnstown 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 Johnstown

In Johnstown in August, the total precipitation amount is 76 mm (3.0 in), occurring over the course of 12 days.

August Precipitation Trends in Johnstown

The chart displays monthly precipitation patterns in Johnstown, 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 Johnstown, August typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec861101111251291511147688102100104
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Johnstown

In Johnstown in August, humidity is 78%. With an average temperature of 23°C (73°F), this humidity feels like a warm, sticky embrace, making outdoor activities a little challenging but still enjoyable for travelers who appreciate a tropical atmosphere.

August Average Humidity in Johnstown

This chart illustrates the average monthly humidity levels in Johnstown, 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 Johnstown is approximately 78%, 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 August generated using information from the Copernicus Climate Change Service.

August UV Index in Johnstown

In Johnstown in August, 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 Johnstown.

Maximum UV Index Levels in Johnstown for August

The chart shows the monthly maximum UV Index (UVI) for Johnstown 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 Johnstown typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: Johnstown 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 Johnstown Compares to Other Months

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

This table compares monthly weather conditions in Johnstown, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)86 mm (3.4 inches)88%moderate
February Weather1°C (34°F)110 mm (4.3 inches)87%moderate
March Weather5°C (42°F)111 mm (4.4 inches)87%high
April Weather11°C (51°F)125 mm (4.9 inches)87%very high
May Weather17°C (63°F)129 mm (5.1 inches)81%very high
June Weather22°C (71°F)151 mm (5.9 inches)82%very high
July Weather24°C (75°F)114 mm (4.5 inches)81%very high
August Weather23°C (73°F)76 mm (3.0 inches)78%very high
September Weather20°C (68°F)88 mm (3.4 inches)78%very high
October Weather14°C (57°F)102 mm (4.0 inches)82%high
November Weather5°C (41°F)100 mm (3.9 inches)89%moderate
December Weather2°C (36°F)104 mm (4.1 inches)86%low

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