September Weather in South Bend, United States

Last updated: June 24, 2025

In September, the average temperature in South Bend, United States hovers around 19°C (67°F). Expect a range that can dip as low as 3°C (38°F) and rise to a warm 34°C (93°F). This month also brings along 79 mm (3.1 in) of precipitation, typically spread over 9 days. With an average humidity level of 78%, be prepared for a pleasantly warm and somewhat humid atmosphere.

September Temperature in South Bend

In September in South Bend, the average temperature is 19°C (67°F), with maximums reaching 34°C (93°F) and minimums dropping as low as 3°C (38°F). This climate makes it an ideal destination for travelers seeking a mix of warm days and cooler evenings.

September Weather in South Bend: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in South Bend, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Bend, September typically has an average temperature of 19°C (67°F), with highs reaching up to 34°C (93°F) and lows dropping to around 3°C (38°F).

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

September Precipitation in South Bend

In South Bend in September, the precipitation amount is 79 mm (3.1 in) spread over 9 days.

September Precipitation Trends in South Bend

The chart displays monthly precipitation patterns in South Bend, 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 South Bend, September typically receives around 79 mm (3.1 inches) of precipitation spread over approximately 9 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 South Bend

In South Bend in September humidity is 78%. With an average temperature of 19°C (67°F), this humidity feels like a warm, heavy blanket enveloping you, making traveling feel both sticky and sluggish as you navigate through the day.

September Average Humidity in South Bend

This chart illustrates the average monthly humidity levels in South Bend, 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 South Bend 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 South Bend

In South Bend 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 South Bend.

Maximum UV Index Levels in South Bend for September

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

Data source: South Bend 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 South Bend Compares to Other Months

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

This table compares monthly weather conditions in South Bend, 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 (28°F)	73 mm (2.9 inches)	85%	moderate
February Weather	-2°C (29°F)	75 mm (2.9 inches)	85%	moderate
March Weather	4°C (39°F)	97 mm (3.8 inches)	86%	high
April Weather	9°C (48°F)	106 mm (4.2 inches)	87%	very high
May Weather	16°C (61°F)	161 mm (6.3 inches)	81%	very high
June Weather	22°C (72°F)	139 mm (5.5 inches)	82%	very high
July Weather	24°C (75°F)	117 mm (4.6 inches)	81%	very high
August Weather	22°C (73°F)	109 mm (4.3 inches)	79%	very high
September Weather	19°C (67°F)	79 mm (3.1 inches)	78%	very high
October Weather	13°C (55°F)	136 mm (5.4 inches)	81%	high
November Weather	4°C (40°F)	74 mm (2.9 inches)	89%	moderate
December Weather	1°C (34°F)	62 mm (2.5 inches)	86%	moderate