Weather in Saint Joseph County, Michigan for September 2026
Until now, September 2026 in Saint Joseph County has been nearly identical to the historical average, with a temperature of 26 °F (showing only a slight deviation of 0.4 °F).
Expect cooler weather in the next days in Saint Joseph County with the forecast suggesting a temperature of 18.3 °F, lower than the historical average.
In general, the average temperature in Saint Joseph County at the beginning of September is 26.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.1 °F by the end of September.
Saint Joseph County experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 195.6 mm.
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Saint Joseph County Weather September
Temperatures trend during September in Saint Joseph County
September weather in Saint Joseph County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 31° /15° | 0.1 mm | 6 | |
| Sept. 2 |  Cloudy | 30° /16° | 0 mm | 7 | |
| Sept. 3 |  Heavy rain at times | 31° /18° | 30.3 mm | 7 | |
| Sept. 4 |  Fog | 26° /14° | 11.9 mm | 6 | |
| Sept. 5 |  Overcast | 22° /13° | 0 mm | 4 | |
| Sept. 6 | Overcast | 22° /9° | 0 mm | 6 | |
| Sept. 7 | Overcast | 22° /11° | 0 mm | 6 | |
| Sept. 8 | Fog | 26° /9° | 0 mm | 4 | |
| Sept. 9 | Overcast | 24° /13° | 10.2 mm | 3 | |
| Sept. 10 | Overcast | 26° /14° | 0.2 mm | 4 | |
| Sept. 11 | Cloudy | 27° /13° | 0 mm | 6 | |
| Sept. 12 |  Partly cloudy | 29° /13° | 0.3 mm | 6 | |
| Sept. 13 |  Moderate rain at times | 25° /13° | 34.9 mm | 6 | |
| Sept. 14 | Cloudy | 26° /12° | 0 mm | 7 | |
| Sept. 15 | Partly cloudy | 29° /14° | 3.8 mm | 5 | |
| Sept. 16 | Cloudy | 25° /15° | 4 mm | 4 | |
| Sept. 17 | Overcast | 27° /17° | 6.7 mm | 4 | |
| Sept. 18 | Fog | 27° /14° | 0 mm | 6 | |
| Sept. 19 |  Thundery outbreaks possible | 25° /13° | 11.6 mm | 4 | |
| Sept. 20 | Thundery outbreaks possible | 24° /14° | 15.7 mm | 4 | |
| Sept. 21 | Moderate or heavy rain shower | 18° /14° | 21.5 mm | 3 | |
| Sept. 22 |  Light rain shower | 21° /12° | 19.1 mm | 3 | |
| Sept. 23 | Fog | 26° /18° | 0 mm | 6 | |
| Sept. 24 | Sunny | 19° /12° | 0 mm | 3.9 | |
| Sept. 25 | Overcast | 19° /11° | 0 mm | 4.2 | |
| Sept. 26 | Sunny | 20° /10° | 0 mm | 5.4 | |
| Sept. 27 | Sunny | 21° /12° | 0 mm | 5.4 | |
| Sept. 28 | Sunny | 22° /13° | 0 mm | 6 | |
| Sept. 29 | Overcast | 22° /14° | 0 mm | 5 | |
| Sept. 30 | Patchy rain possible | 18° /10° | 19.9 mm | 4 | |
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Saint Joseph County in September - FAQ
What are the expected maximum and minimum temperatures in Saint Joseph County during September?
How much rainfall should be expected in Saint Joseph County during September?
What are the typical wind conditions in Saint Joseph County during September?
September rainfall patterns in Saint Joseph County
UV exposure in Saint Joseph County during September
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Where is Saint Joseph County?Get accurate weather forecasts for Saint Joseph County, located at latitude 41.799 and longitude -85.419. Stay updated with localized weather information tailored for Saint Joseph County.