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October Weather in Cornwall, United States

Last updated: June 24, 2025

In October, the average temperature in Cornwall, United States hovers around 14°C (57°F). Expect a wide range of temperatures, from a brisk minimum of -1°C (31°F) to a warm maximum of 32°C (89°F). During this month, anticipate approximately 141 mm (5.5 in) of precipitation spread over 11 days, contributing to an average humidity level of 74%.

October Temperature in Cornwall

In October in Cornwall, the average temperature is a mild 14°C (57°F). Maximum temperatures can reach a warm 32°C (89°F), while minimums can drop to a chilly -1°C (31°F). Travelers should be prepared for a broad range of temperatures, ensuring they pack accordingly for both warm days and cool nights.

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

The chart illustrates October 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, October typically has an average temperature of 14°C (57°F), with highs reaching up to 32°C (89°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec303339496069757366564234
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.

October Precipitation in Cornwall

In Cornwall in October, the total precipitation amount is 141 mm (5.5 in), which falls over the course of 11 days.

October Precipitation Trends in Cornwall

The chart displays monthly precipitation patterns in Cornwall, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Cornwall, October typically receives around 141 mm (5.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec6995881181199512912111514190102
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Cornwall

In Cornwall in October, humidity is 74%. With an average temperature of 14°C (57°F), this humidity feels like a warm, damp blanket wrapping around you, making it slightly uncomfortable for traveling, as you may find yourself quickly sweating and in need of frequent breaks to cool down.

October Average Humidity in Cornwall

This chart illustrates the average monthly humidity levels in Cornwall, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Cornwall is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Cornwall

In Cornwall in October, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Cornwall, you can refer to this Hourly UV Index in Cornwall.

Maximum UV Index Levels in Cornwall for October

The chart shows the monthly maximum UV Index (UVI) for Cornwall in October, 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 October, the maximum UV index in Cornwall typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: Cornwall October 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 October 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 October’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 October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)69 mm (2.7 inches)84%moderate
February Weather1°C (33°F)95 mm (3.7 inches)82%moderate
March Weather4°C (39°F)88 mm (3.5 inches)81%high
April Weather10°C (50°F)118 mm (4.6 inches)78%very high
May Weather15°C (60°F)119 mm (4.7 inches)69%very high
June Weather20°C (69°F)95 mm (3.7 inches)69%very high
July Weather24°C (75°F)129 mm (5.1 inches)62%very high
August Weather23°C (73°F)121 mm (4.8 inches)65%very high
September Weather19°C (67°F)115 mm (4.5 inches)68%very high
October Weather14°C (57°F)141 mm (5.5 inches)74%high
November Weather6°C (42°F)90 mm (3.5 inches)82%moderate
December Weather1°C (35°F)102 mm (4.0 inches)80%low

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