September weather forecast
South Bend, IN

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Colorful river lights on the bridge of St. Joseph River in South Bend, Indiana
Colorful river lights on the bridge of St. Joseph River in South Bend, Indiana

Weather in September

September in South Bend ushers in early hints of autumn. The city experiences a significant drop in temperatures from the summer highs to a moderate 72.9°F (22.7°C). However, with a dip in temperatures, September also sees a decline in rainfall to 1.65" (42mm), making for drier days. It's a period of equilibrium, where the sweltering summer heat recedes and the brisk winter chill is yet to set it. With October on the horizon, temperatures continue their downward slope.

Temperature

September is characterized by a mild reduction in the average high-temperature, from a warm 78.4°F (25.8°C) in August to an agreeable 72.9°F (22.7°C). Throughout September, South Bend anticipates an average low-temperature of 55.9°F (13.3°C).

Humidity

In September, the average relative humidity is 79%.

Rainfall

In September, the rain falls for 13.6 days. Throughout September, 1.65" (42mm) of precipitation is accumulated. Throughout the year, there are 160.2 rainfall days, and 25.31" (643mm) of precipitation is accumulated.

Snowfall

In South Bend, snow does not fall in June through September.

Daylight

The average length of the day in September in South Bend is 12h and 28min.
On the first day of the month, sunrise is at 7:11 am and sunset at 8:17 pm. On the last day of September, sunrise is at 7:41 am and sunset at 7:27 pm EDT.

Sunshine

In September, the average sunshine in South Bend is 8.2h.

UV index

In South Bend, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: A maximum UV index of 4 in September translates into the following recommendations:
Put precautions into practice - Guidance to elude sunburn is provided. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Updated: Aug 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature in South Bend?

The high-temperature, in September, in South Bend, records 72.9°F (22.7°C), while the low-temperature is 55.9°F (13.3°C).

What is the average humidity in September?

The average relative humidity in September is 79%.

How many days does it rain in September in South Bend?

In South Bend, Indiana, in September, during 13.6 rainfall days, 1.65" (42mm) of precipitation is typically accumulated.

When it does not snow?

In South Bend, snow does not fall in June through September.

Does it snow in September?

In South Bend, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September?

In South Bend, the average day length in September is 12h and 28min.

When are sunrise and sunset in September?

On the first day of September, sunrise is at 7:11 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 7:27 pm EDT.

How long on average sun shines in September?

In September, the average sunshine duration is 8.2h.

What is the UV index reading in September?

In South Bend, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
South Bend, IN

Average temperature in September - South Bend, IN
  • Average high temperature in September: 72.9°F

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in September: 55.9°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).

Average pressure in September
South Bend, IN

Average pressure in September - South Bend, IN
  • Average pressure in September: 30.03"Hg

The months with the highest atmospheric pressure are January and November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in September
South Bend, IN

Average wind speed in September - South Bend, IN
  • Average wind speed in September: 7.4mph

The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).

Average humidity in September
South Bend, IN

Average humidity in September - South Bend, IN
  • Average humidity in September: 79%

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (75%).

Average rainfall in September
South Bend, IN

Average rainfall in September - South Bend, IN
  • Average rainfall in September: 1.65"

The wettest month (with the highest rainfall) is June (3.19").
The driest month (with the least rainfall) is February (1.38").

Average rainfall days in September
South Bend, IN

Average rainfall days in September - South Bend, IN
  • Average rainfall days in September: 13.6 days

The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is January (7.5 days).

Average snowfall in September
South Bend, IN

Average snowfall in September - South Bend, IN
  • Average snowfall in September: 0"

The month with the highest snowfall is January (4.61").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
South Bend, IN

Average snowfall days in September - South Bend, IN
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (18 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
South Bend, IN

Average daylight in September / Average sunshine in September - South Bend, IN
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in September: 8h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

Average sunshine days in September
South Bend, IN

Average sunshine days in September - South Bend, IN
  • Average sunshine days in September: 13.5 days

The month with the most sunshine days is September (13.5 days).
The month with the least sunshine days is February (8.3 days).

Average UV index in September
South Bend, IN

Average UV index in September - South Bend, IN
  • Average UV index in September: 4

The months with the highest UV index are June and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in September
South Bend, IN

Average cloud cover in September - South Bend, IN
  • Average cloud cover in September: 33

The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in September
South Bend, IN

Average visibility in September - South Bend, IN
  • Average visibility in September: 6mi

The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).

South Bend, Indiana, USA

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