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September Weather in Saint Johnsville, United States

Last updated: June 24, 2025

In September, the average temperature in Saint Johnsville, United States hovers around 16°C (62°F). Visitors can expect a chill, with minimum temperatures dipping to 0°C (32°F), while highs can reach up to 31°C (88°F). Rainfall is moderate, with 96 mm (3.8 in) spread over approximately 10 days, resulting in an average humidity of 72%. Plan accordingly for a mix of cool and warm weather!

September Temperature in Saint Johnsville

In September in Saint Johnsville, the average temperature is 16°C (62°F). Maximums can reach 31°C (88°F), while minimums can drop as low as 0°C (32°F). Be prepared for a variety of weather conditions when traveling during this time.

September Weather in Saint Johnsville: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Saint Johnsville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Johnsville, September typically has an average temperature of 16°C (62°F), with highs reaching up to 31°C (88°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec222532445765706861513628
Data source: Temperature data for Saint Johnsville 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 Saint Johnsville

In Saint Johnsville in September, the total precipitation amount is 96 mm (3.8 in) over a span of 10 days.

September Precipitation Trends in Saint Johnsville

The chart displays monthly precipitation patterns in Saint Johnsville, 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 Saint Johnsville, September typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec931109413213111914312996170117114
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Saint Johnsville

In Saint Johnsville in September, humidity is 72%. With an average temperature of 16°C (62°F), this humidity feels like a warm blanket wrapped around you, making it slightly uncomfortable for traveling as you might find yourself sweating more than usual, especially during outdoor activities.

September Average Humidity in Saint Johnsville

This chart illustrates the average monthly humidity levels in Saint Johnsville, 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 Saint Johnsville is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%84%76%72%67%64%72%81%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Saint Johnsville

In Saint Johnsville 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 Saint Johnsville.

Maximum UV Index Levels in Saint Johnsville for September

The chart shows the monthly maximum UV Index (UVI) for Saint Johnsville 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 Saint Johnsville typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468910998632
Data source: Saint Johnsville 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 Saint Johnsville Compares to Other Months

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

This table compares monthly weather conditions in Saint Johnsville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)93 mm (3.7 inches)89%moderate
February Weather-4°C (26°F)110 mm (4.3 inches)88%moderate
March Weather0°C (32°F)94 mm (3.7 inches)86%high
April Weather7°C (44°F)132 mm (5.2 inches)84%very high
May Weather14°C (57°F)131 mm (5.2 inches)76%very high
June Weather18°C (65°F)119 mm (4.7 inches)72%very high
July Weather21°C (70°F)143 mm (5.6 inches)66%very high
August Weather20°C (68°F)129 mm (5.1 inches)64%very high
September Weather16°C (62°F)96 mm (3.8 inches)72%very high
October Weather10°C (51°F)170 mm (6.7 inches)81%high
November Weather2°C (36°F)117 mm (4.6 inches)87%moderate
December Weather-2°C (28°F)114 mm (4.5 inches)84%low

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