September Weather in Clarion, United States

Last updated: June 24, 2025

In September, the average temperature in Clarion, United States hovers around 18°C (65°F). Expect a minimum of 2°C (36°F) and a peak of 32°C (89°F), providing a wide range for weather enthusiasts. Precipitation during this time averages 126 mm (4.9 in) over 11 days, while humidity remains at a steady 67%. Prepare accordingly for both warmth and occasional showers!

September Temperature in Clarion

In September in Clarion, the average temperature is 18°C (65°F). Maximum temperatures can reach 32°C (89°F), while minimums can dip as low as 2°C (36°F). Travelers should be prepared for a wide range of temperatures, making it essential to pack layers for comfort during the day and evening.

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

The chart illustrates September temperature patterns in Clarion, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Clarion, September typically has an average temperature of 18°C (65°F), with highs reaching up to 32°C (89°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec273138485967727064543933
Data source: Temperature data for Clarion 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 Clarion

In Clarion in September, the precipitation amount is 126 mm (4.9 in) over the course of 11 days.

September Precipitation Trends in Clarion

The chart displays monthly precipitation patterns in Clarion, 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 Clarion, September typically receives around 126 mm (4.9 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec101115108136152143150112126131103104
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Clarion

In Clarion in September humidity is 67%. With an average temperature of 18°C (65°F), this humidity feels like a mild blanket wrapping around you, making outdoor activities feel pleasantly refreshing, yet you may find yourself reaching for a drink more often to stay hydrated while exploring the sights.

September Average Humidity in Clarion

This chart illustrates the average monthly humidity levels in Clarion, 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 Clarion is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%89%88%80%79%74%64%67%81%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Clarion

In Clarion in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Clarion.

Maximum UV Index Levels in Clarion for September

The chart shows the monthly maximum UV Index (UVI) for Clarion 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 Clarion typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Clarion 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 Clarion Compares to Other Months

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

This table compares monthly weather conditions in Clarion, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (28°F)101 mm (4.0 inches)89%moderate
February Weather-1°C (31°F)115 mm (4.5 inches)90%moderate
March Weather3°C (38°F)108 mm (4.2 inches)89%high
April Weather9°C (48°F)136 mm (5.3 inches)88%very high
May Weather15°C (60°F)152 mm (6.0 inches)80%very high
June Weather20°C (68°F)143 mm (5.6 inches)79%very high
July Weather22°C (72°F)150 mm (5.9 inches)74%very high
August Weather21°C (70°F)112 mm (4.4 inches)64%very high
September Weather18°C (65°F)126 mm (4.9 inches)67%very high
October Weather12°C (54°F)131 mm (5.2 inches)81%high
November Weather4°C (39°F)103 mm (4.1 inches)89%moderate
December Weather1°C (33°F)104 mm (4.1 inches)88%low

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