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September Weather in Cornish, United States

Last updated: June 24, 2025

In September, the average temperature in Cornish, United States hovers around 18°C (64°F). Expect temperatures to vary, with a minimum of 2°C (35°F) and a maximum reaching up to 32°C (90°F). Rainfall amounts to approximately 64 mm (2.5 in) over 7 days, contributing to an average humidity level of 71%. Whether enjoying sunny afternoons or occasional showers, this month's weather offers a diverse experience!

September Temperature in Cornish

In September in Cornish, the average temperature is 18°C (64°F), with maximums reaching up to 32°C (90°F) and minimums dropping as low as 2°C (35°F). This range makes it essential for travelers to pack both light clothing for warm days and warmer layers for cooler nights.

September Weather in Cornish: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Cornish, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cornish, September typically has an average temperature of 18°C (64°F), with highs reaching up to 32°C (90°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec242633455666727164523828
Data source: Temperature data for Cornish 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.

September Precipitation in Cornish

In Cornish in September, the precipitation amount is 64 mm (2.5 in) accumulated over a period of 7 days.

September Precipitation Trends in Cornish

The chart displays monthly precipitation patterns in Cornish, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Cornish, September typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec79897712374871468264121107114
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Cornish

In Cornish in September, humidity is 71%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making traveling a bit sticky but still pleasant as the warmth envelops you, urging you to explore the vibrant surroundings while staying hydrated.

September Average Humidity in Cornish

This chart illustrates the average monthly humidity levels in Cornish, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Cornish is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%82%80%72%72%67%66%71%79%84%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Cornish

In Cornish in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Cornish.

Maximum UV Index Levels in Cornish for September

The chart shows the monthly maximum UV Index (UVI) for Cornish in September, 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 September, the maximum UV index in Cornish typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: Cornish September 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 September Weather in Cornish Compares to Other Months

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

This table compares monthly weather conditions in Cornish, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)79 mm (3.1 inches)86%low
February Weather-3°C (26°F)89 mm (3.5 inches)84%moderate
March Weather0°C (33°F)77 mm (3.0 inches)82%moderate
April Weather7°C (45°F)123 mm (4.8 inches)80%very high
May Weather13°C (56°F)74 mm (2.9 inches)72%very high
June Weather19°C (67°F)87 mm (3.4 inches)72%very high
July Weather22°C (72°F)145 mm (5.7 inches)67%very high
August Weather22°C (71°F)82 mm (3.2 inches)66%very high
September Weather18°C (64°F)64 mm (2.5 inches)71%high
October Weather11°C (52°F)121 mm (4.8 inches)78%moderate
November Weather3°C (39°F)107 mm (4.2 inches)84%moderate
December Weather-2°C (28°F)114 mm (4.5 inches)81%low

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