South Bend, IN weather in September
South Bend is mild in September, with some rain: highs average 74°F and nights drop to about 53°F. Expect about 10 wet days. A good month for most outdoor plans.
- Normal high
- 74°F
- Normal low
- 53°F
- Wet days
- 10
- 3.5 in total
- Muggy days
- 3
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 79°F | 69°F |
| Normal low | 58°F | 48°F |
| Chance of a wet day | 32% | 34% |
| Sunrise / sunset | 7:11 am / 8:18 pm | 7:40 am / 7:29 pm |
| Daylight | 13.1 h | 11.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical September day
- 6 am57°Fdew point 53°F
- 9 am63°Fdew point 55°F
- Noon71°Fdew point 55°F
- 3 pm73°Fdew point 54°F
- 6 pm70°Fdew point 55°F
- 9 pm63°Fdew point 55°F
NOAA hourly normals (local standard time) from South Bend Michiana Rgnl Airport (4 mi away); average wind 7 mph; clear or few clouds in 56% of daytime hours, mostly cloudy or overcast in 33%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F15 of 30
- Hot dayshigh 90°F or more2 of 30
- Muggy daysdaily mean dew point 65°F or more3 of 30
- Wet daysat least 0.01 in of rain or melted snow10 of 30
- Notable rainat least 0.10 in6 of 30
- Freezing nightslow 32°F or below0 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 3.5 in; a dry September brings about 1.8 in and a wet one about 3.7 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202002: average high 80°F
- Coolest September1993: average high 68°F
- Wettest September2008: 13.9 in
- Driest September2009: 0.5 in
- Highest reading97°F (September 10, 2013)
- Lowest reading32°F (September 28, 1991)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 81°F | 74°F | 62°F |
| Normal low | 61°F | 53°F | 42°F |
| Wet days | 10 | 10 | 12 |
| Comfortable days | 8 | 15 | 11 |
| Daylight | 13.8 h | 12.5 h | 11.1 h |
Highs change by -7°F from August and -12°F into October.
Nearby alternatives in September
- Warmer: Cincinnati, OH200 mi · high 80°F · 9 wet days
- Drier: Carmel, IN118 mi · high 77°F · 7 wet days
- Cooler: Sister Bay, WI246 mi · high 68°F · 10 wet days
How South Bend ranks in September
- Normal high291st warmest of 378 cities; 6th of 6 in Indiana
- Wet days291st driest of 378
- Comfortable days87th most of 342
What to pack for South Bend in September
- A rain jacket or umbrella – rain on about 10 days
Heating and cooling
September has 116 heating degree days and 77 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is South Bend in September?
The normal high is 74°F and the normal low is 53°F. From 1991 to 2020 the hottest September reading was 97°F (September 10, 2013).
Does it rain a lot in South Bend in September?
About 10 days in September have at least 0.01 in of precipitation, and the normal total is 3.5 in. The wettest September in 1991-2020 was in 2008 (13.9 in); the driest was in 2009 (0.5 in).
Is September a good time to visit South Bend?
September ranks 2nd of 12 months on our comfort score for South Bend (67 out of 100). It has about 15 comfortable days and about 2 days at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain, snowfall, snow depth, frost dates, humidity and wind by hour and cloud cover: South Bend Michiana Rgnl Airport (USW00014848), 3.8 mi WNW of the city center, 773 ft (81 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: South Bend Regional Airport (725350-14848), 3.8 mi WNW of the city center, 772 ft (80 ft higher than the city). Hourly observations, 1991-2020.