Saint Joseph County (South Bend)
September
Weather in Saint Joseph County, Indiana for September 2026
Your guide to Saint Joseph County weather in September - trends and predictions
Beach Hazards Statement - See hour by hour.
So far, September 2026 in Saint Joseph County shows a warmer trend than usual by 3.7 °F.
The forecast for the next days in Saint Joseph County predicts a temperature of 21.6 °F, which is cooler than the historical average.
In general, the average temperature in Saint Joseph County at the beginning of September is 26.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19 °F by the end of September.
Saint Joseph County experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 83.2 mm.
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Temperatures
Rain 🌧️
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21
Dry days
9
Rainy days
0
Snow days
25°/13°
Temperatures
18 km/h
Avg max wind
68 %
Avg humidity
Saint Joseph County Weather September
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Temperatures trend during September in Saint Joseph County
See the weather trend as well as the moving average line
September weather in Saint Joseph County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 28° /15° | 0.8 mm | 6 | |
| Sept. 2 | Sunny | 28° /14° | 0 mm | 7 | |
| Sept. 3 | Sunny | 29° /15° | 3.2 mm | 7 | |
| Sept. 4 | Sunny | 28° /14° | 8.4 mm | 6 | |
| Sept. 5 |  Partly cloudy | 26° /15° | 0 mm | 6 | |
| Sept. 6 |  Light rain shower | 22° /12° | 1.9 mm | 5 | |
| Sept. 7 | Patchy rain possible | 22° /11° | 0 mm | 5 | |
| Sept. 8 | Sunny | 24° /8° | 0 mm | 4 | |
| Sept. 9 | Sunny | 25° /12° | 12.4 mm | 4 | |
| Sept. 10 |  Overcast | 27° /14° | 0 mm | 5 | |
| Sept. 11 | Partly cloudy | 29° /13° | 0 mm | 7 | |
| Sept. 12 | Sunny | 30° /14° | 0.1 mm | 7 | |
| Sept. 13 | Overcast | 29° /16° | 24.9 mm | 7 | |
| Sept. 14 | Sunny | 21° /11° | 0 mm | 6.2 | |
| Sept. 15 | Light rain shower | 27° /15° | 5.7 mm | 6.2 | |
| Sept. 16 |  Mist | 22° /19° | 6.4 mm | 2.2 | |
| Sept. 17 | Patchy rain possible | 24° /18° | 1 mm | 6 | |
| Sept. 18 | Sunny | 25° /17° | 0 mm | 6 | |
| Sept. 19 | Patchy rain possible | 31° /18° | 0.5 mm | 7 | |
| Sept. 20 | Overcast | 24° /17° | 1.9 mm | 4 | |
| Sept. 21 | Light rain shower | 27° /16° | 9.1 mm | 7 | |
| Sept. 22 | Patchy rain possible | 23° /18° | 8 mm | 5 | |
| Sept. 23 | Patchy rain possible | 20° /15° | 0.1 mm | 5 | |
| Sept. 24 | Patchy rain possible | 16° /10° | 3.6 mm | 4 | |
| Sept. 25 | Light rain shower | 12° /9° | 12.9 mm | 3 | |
| Sept. 26 | Patchy rain possible | 15° /9° | 1.9 mm | 3 | |
| Sept. 27 | Sunny | 15° /11° | 0.1 mm | 5 | |
| Sept. 28 | Overcast | 24° /15° | 0 mm | 6 | |
| Sept. 29 | Overcast | 26° /14° | 0 mm | 6 | |
| Sept. 30 | Overcast | 25° /15° | 0 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Saint Joseph County in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Saint Joseph County forecast closer to your planned date for the most up-to-date weather information.
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Saint Joseph County in September - FAQ
What are the expected maximum and minimum temperatures in Saint Joseph County during September?
Enjoy moderate daytime temperatures of up to 25° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Saint Joseph County during September?
Moderate rainfall is anticipated in Saint Joseph County during September, with a total of 83.2 mm spread over approximately 9 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Saint Joseph County during September?
The average wind speed in Saint Joseph County during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Saint Joseph County
Explore the daily rainfall trends and prepare for Saint Joseph Countys September weather 💧
Typically, Saint Joseph County has 9 rainy days in September with a total of 83.2 mm of rainfall.
UV exposure in Saint Joseph County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Saint Joseph County?Get accurate weather forecasts for Saint Joseph County, located at latitude 41.683 and longitude -86.25. Stay updated with localized weather information tailored for Saint Joseph County.
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