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August Weather in Cornwall, United States

Last updated: June 24, 2025

In Cornwall, United States, the average temperature in August reaches a pleasant 24°C (76°F). Expect temperatures to fluctuate with a minimum of 13°C (55°F) and a maximum of 35°C (95°F). During this month, you can anticipate 128 mm (5.0 in) of precipitation spread over 15 days, contributing to an average humidity level of 62%.

August Temperature in Cornwall

In August in Cornwall, the average temperature is 24°C (76°F). Maximums can reach 35°C (95°F) and minimums can be as low as 13°C (55°F). It's an ideal time for travelers seeking pleasant weather and a variety of outdoor activities.

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

The chart illustrates August temperature patterns in Cornwall, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cornwall, August typically has an average temperature of 24°C (76°F), with highs reaching up to 35°C (95°F) and lows dropping to around 13°C (55°F).
JanFebMarAprMayJunJulAugSepOctNovDec343743536372787569594437
Data source: Temperature data for Cornwall 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 Cornwall

In Cornwall in August, the precipitation amount is 128 mm (5.0 in) over the course of 15 days.

August Precipitation Trends in Cornwall

The chart displays monthly precipitation patterns in Cornwall, 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 Cornwall, August typically receives around 128 mm (5.0 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec69106100104125951321281081069296
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Cornwall

In Cornwall in August, humidity is 62%. With an average temperature of 24°C (76°F), this humidity feels like a warm, slightly sticky embrace, making it essential for travelers to stay hydrated and take breaks in the shade as they explore the vibrant surroundings.

August Average Humidity in Cornwall

This chart illustrates the average monthly humidity levels in Cornwall, 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 Cornwall is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%85%83%75%74%65%62%66%79%87%85%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Cornwall

In Cornwall 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 Cornwall.

Maximum UV Index Levels in Cornwall for August

The chart shows the monthly maximum UV Index (UVI) for Cornwall 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 Cornwall typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Cornwall 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 Cornwall Compares to Other Months

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

This table compares monthly weather conditions in Cornwall, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)69 mm (2.7 inches)87%moderate
February Weather3°C (37°F)106 mm (4.2 inches)85%moderate
March Weather6°C (43°F)100 mm (3.9 inches)85%high
April Weather12°C (53°F)104 mm (4.1 inches)83%very high
May Weather17°C (64°F)125 mm (4.9 inches)75%very high
June Weather22°C (73°F)95 mm (3.7 inches)73%very high
July Weather25°C (78°F)132 mm (5.2 inches)65%very high
August Weather24°C (76°F)128 mm (5.0 inches)62%very high
September Weather21°C (70°F)108 mm (4.3 inches)66%very high
October Weather15°C (59°F)106 mm (4.2 inches)79%high
November Weather7°C (45°F)92 mm (3.6 inches)87%moderate
December Weather3°C (38°F)96 mm (3.8 inches)85%low

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