September Weather in Batavia, United States

Last updated: June 24, 2025

In September, the average temperature in Batavia, United States is a pleasant 21°C (69°F). Expect a minimum temperature as low as 6°C (43°F), while the maximum can soar to 34°C (93°F). Be prepared for some rain, with an average precipitation of 126 mm (5.0 in) over approximately 8 days. The average humidity during this month hovers around 78%, ensuring a humid yet comfortable atmosphere.

September Temperature in Batavia

In September in Batavia, the average temperature is 21°C (69°F). Maximums can reach 34°C (93°F), and minimums can dip as low as 6°C (43°F). This makes Batavia a great destination for travelers looking for mild weather with a mix of warm days and cool nights.

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

The chart illustrates September temperature patterns in Batavia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Batavia, September typically has an average temperature of 21°C (69°F), with highs reaching up to 34°C (93°F) and lows dropping to around 6°C (43°F).

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

September Precipitation in Batavia

In Batavia in September, the precipitation amount is 126 mm (5.0 in) spread over 8 days, indicating a relatively wet period for the region.

September Precipitation Trends in Batavia

The chart displays monthly precipitation patterns in Batavia, 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 Batavia, September typically receives around 126 mm (5.0 inches) of precipitation spread over approximately 8 days.

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

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Millimeters (mm) Inches (in)

September Humidity in Batavia

In Batavia in September, humidity is 78%. With an average temperature of 21°C (69°F), this humidity feels like a warm embrace that clings to your skin, making outdoor activities feel more intense and leaving you yearning for refreshing breezes or a cool drink as you explore.

September Average Humidity in Batavia

This chart illustrates the average monthly humidity levels in Batavia, 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 Batavia 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 Batavia

In Batavia 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 Batavia.

Maximum UV Index Levels in Batavia for September

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

Data source: Batavia 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 Batavia Compares to Other Months

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

This table compares monthly weather conditions in Batavia, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	51 mm (2.0 inches)	81%	moderate
February Weather	-3°C (27°F)	52 mm (2.1 inches)	81%	moderate
March Weather	5°C (42°F)	92 mm (3.6 inches)	81%	high
April Weather	10°C (51°F)	81 mm (3.2 inches)	82%	very high
May Weather	17°C (64°F)	153 mm (6.0 inches)	78%	very high
June Weather	24°C (75°F)	134 mm (5.3 inches)	81%	extreme
July Weather	25°C (78°F)	71 mm (2.8 inches)	79%	very high
August Weather	24°C (75°F)	76 mm (3.0 inches)	77%	very high
September Weather	21°C (69°F)	126 mm (5.0 inches)	78%	very high
October Weather	12°C (54°F)	124 mm (4.9 inches)	78%	high
November Weather	4°C (40°F)	53 mm (2.1 inches)	87%	moderate
December Weather	0°C (33°F)	41 mm (1.6 inches)	84%	moderate