September Weather in Penn Yan, United States

Last updated: June 24, 2025

In September, the average temperature in Penn Yan, United States settles around 18°C (65°F), providing a pleasant backdrop for various activities. Visitors can expect a minimum temperature of 5°C (41°F) and a maximum of 33°C (91°F), showcasing the region's diverse climate. Moreover, with an average precipitation of 81 mm (3.2 in) spread over 9 days, it's wise to pack an umbrella. Lastly, the average humidity level is 78%, adding a touch of tropical warmth to the atmosphere.

September Temperature in Penn Yan

In September in Penn Yan, the average temperature is 18°C (65°F). The maximum can reach 33°C (91°F), while the minimum can drop as low as 5°C (41°F). Overall, it's a great time to explore Penn Yan with comfortable temperatures and a variety of weather experiences.

September Weather in Penn Yan: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Penn Yan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Penn Yan, September typically has an average temperature of 18°C (65°F), with highs reaching up to 33°C (91°F) and lows dropping to around 5°C (41°F).

Data source: Temperature data for Penn Yan generated using information from the Copernicus Climate Change Service.

September Precipitation in Penn Yan

In Penn Yan in September, the precipitation amount is 81 mm (3.2 in) spread over a duration of 9 days.

September Precipitation Trends in Penn Yan

The chart displays monthly precipitation patterns in Penn Yan, 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 Penn Yan, September typically receives around 81 mm (3.2 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Penn Yan

In Penn Yan in September, humidity is 78%. With an average temperature of 18°C (65°F), this humidity feels like a warm, enveloping blanket, making travel quite muggy and potentially uncomfortable, as it can leave you feeling sticky and fatigued more quickly than usual.

September Average Humidity in Penn Yan

This chart illustrates the average monthly humidity levels in Penn Yan, 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 Penn Yan is approximately 78%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Penn Yan

In Penn Yan 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 Penn Yan.

Maximum UV Index Levels in Penn Yan for September

The chart shows the monthly maximum UV Index (UVI) for Penn Yan 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 Penn Yan typically reaches 8, which falls under the very high exposure category.

Data source: Penn Yan 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 Penn Yan Compares to Other Months

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

This table compares monthly weather conditions in Penn Yan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (27°F)	77 mm (3.0 inches)	90%	moderate
February Weather	-2°C (29°F)	81 mm (3.2 inches)	90%	moderate
March Weather	2°C (35°F)	74 mm (2.9 inches)	87%	high
April Weather	8°C (46°F)	112 mm (4.4 inches)	88%	very high
May Weather	14°C (58°F)	116 mm (4.5 inches)	82%	very high
June Weather	20°C (68°F)	89 mm (3.5 inches)	79%	very high
July Weather	23°C (73°F)	142 mm (5.6 inches)	78%	very high
August Weather	22°C (72°F)	95 mm (3.8 inches)	76%	very high
September Weather	18°C (65°F)	81 mm (3.2 inches)	78%	very high
October Weather	12°C (55°F)	142 mm (5.6 inches)	84%	high
November Weather	5°C (41°F)	86 mm (3.4 inches)	89%	moderate
December Weather	0°C (33°F)	91 mm (3.6 inches)	86%	low