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September Weather in Harrisville, United States

Last updated: June 24, 2025

In September, the average temperature in Harrisville, United States is a pleasant 21°C (70°F). However, temperatures can vary significantly, dipping as low as 5°C (41°F) and soaring to a maximum of 36°C (97°F). Visitors should be prepared for a fair amount of rain, with an average precipitation of 110 mm (4.3 in) spread over 9 days. With an average humidity level of 73%, the weather can feel quite warm and sticky.

September Temperature in Harrisville

In September in Harrisville, the average temperature is 21°C (70°F). Maximums can reach 36°C (97°F), and minimums can dip as low as 5°C (41°F). It's a great time to visit for those who enjoy mild weather with the possibility of warm days and cool evenings.

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

The chart illustrates September temperature patterns in Harrisville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harrisville, September typically has an average temperature of 21°C (70°F), with highs reaching up to 36°C (97°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec343945546471767469594439
Data source: Temperature data for Harrisville 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 Harrisville

In Harrisville in September, the precipitation amount is 110 mm (4.3 in) over the course of 9 days.

September Precipitation Trends in Harrisville

The chart displays monthly precipitation patterns in Harrisville, 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 Harrisville, September typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec9613411414615417613111111011685121
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Harrisville

In Harrisville in September, humidity is 73%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace that can make outdoor activities feel sweltering, so it's essential to stay hydrated and take breaks in the shade while exploring.

September Average Humidity in Harrisville

This chart illustrates the average monthly humidity levels in Harrisville, 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 Harrisville is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%88%87%82%84%82%73%74%81%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Harrisville

In Harrisville 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 Harrisville.

Maximum UV Index Levels in Harrisville for September

The chart shows the monthly maximum UV Index (UVI) for Harrisville 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 Harrisville typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098753
Data source: Harrisville 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 Harrisville Compares to Other Months

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

This table compares monthly weather conditions in Harrisville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)96 mm (3.8 inches)88%moderate
February Weather4°C (39°F)134 mm (5.3 inches)88%moderate
March Weather7°C (45°F)114 mm (4.5 inches)88%high
April Weather12°C (54°F)146 mm (5.8 inches)86%very high
May Weather18°C (65°F)154 mm (6.1 inches)82%very high
June Weather22°C (71°F)176 mm (6.9 inches)84%very high
July Weather24°C (76°F)131 mm (5.2 inches)82%very high
August Weather23°C (74°F)111 mm (4.4 inches)73%very high
September Weather21°C (70°F)110 mm (4.3 inches)73%very high
October Weather15°C (59°F)116 mm (4.6 inches)81%high
November Weather7°C (45°F)85 mm (3.4 inches)89%moderate
December Weather4°C (39°F)121 mm (4.7 inches)86%moderate

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