Last updated: February 24, 2025
In September, Notre Dame, United States, experiences a dynamic weather pattern characterized by maximum temperatures soaring up to 34°C (93°F), while the average temperature remains a comfortable 19°C (67°F). As the month transitions into autumn, early morning chills can be felt with a minimum temperature dipping to 3°C (38°F). Despite the warm days, the region receives a moderate precipitation total of 79 mm (3.1 in) over 9 days, contributing to a humidity level of 78% that adds to the season's vibrant atmosphere. This blend of warmth and moisture enriches Notre Dame's surroundings, making September a notable month for both locals and visitors.
In September, Notre Dame experiences a delightful transition as summer yields to the crispness of fall. Temperatures range from a minimum of 3°C (38°F) to a pleasant average of 19°C (67°F), with daytime highs reaching up to 34°C (93°F). This month marks a significant shift compared to the sweltering peaks of summer, yet it still offers some warmth, particularly in early September. The gradual cooling trend is evident as the average temperature dips from the highs of August, preparing the landscape for the vibrant hues of autumn. As September unfolds, this blend of warmth and the impending chill creates a perfect backdrop for outdoor activities, making it an ideal time to explore the picturesque surroundings of Notre Dame.
In September, Notre Dame experiences a transitional shift in weather, with 79 mm (3.1 inches) of precipitation over nine days. This marks a slight decrease from the wetter months of summer, where rainfall peaked in May at 161 mm (6.3 inches), and continues a trend of declining precipitation as the year progresses. Compared to August’s 109 mm (4.3 inches), September's rain represents a return to more moderate conditions. This gradual reduction in both rainfall and precipitation days hints at the onset of the drier fall months ahead, setting the stage for October's expected uptick in precipitation with 136 mm (5.4 inches) predicted over fourteen days. The rhythm of Notre Dame's weather showcases a vivid tapestry of seasonal change, capturing the essence of autumn's arrival.
In September, Notre Dame experiences a slight drop in humidity, with levels averaging around 78%. This marks the end of the humid summer months, where humidity peaked at 86% in March and steadily decreased through the warmer season, showcasing a trend towards more comfortable conditions. As the year progresses into October, humidity levels rise again, reminding residents of the approaching winter. Overall, the transition into autumn brings a refreshing shift, making September a pleasant time in Notre Dame, characterized by gradually easing humidity levels following the summer heat.
In September, Notre Dame experiences a UV Index of 8, categorizing it within the very high exposure range. This marks a slight decline from the peak summer months of June and July, where the UV Index reached its maximum at 10. However, September still demands caution, with a burn time of only 15 minutes. As the year progresses towards autumn, the UV Index begins to decrease, but the potential for harmful UV exposure remains significant. This trend highlights the importance of protective measures throughout the summer and into early fall. For more details on UV levels and safety precautions, visit Notre Dame UV Index.
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September in Notre Dame marks a beautiful transition as summer gradually gives way to autumn, evidenced by a substantial 290 hours of sunshine. Following the sun-drenched peak of July's 358 hours, daylight begins to taper off, yet September still boasts a generous amount of bright hours, inviting opportunities for outdoor activities and scenic strolls along the campus. This month serves as a perfect bridge, connecting the warmth of summer with the crispness of fall, making it a favorite for students and residents alike. As the daylight hours decrease steadily into autumn, September remains a reminder of nature's vibrant cycle, filled with golden hues and cooler breezes.
In September, Notre Dame experiences a notable uptick in sunny days, with a 55% chance of sunshine—the highest for the year. This increase follows a trend from the summer months, where the likelihood of clear skies steadily rises from 41% in June to 46% in August. As the vibrant hues of early autumn begin to emerge, residents and visitors alike can relish in the delightful weather, making it an ideal time for outdoor activities and exploration. This seasonal shift not only breathes life into the landscape but also enhances the charm of this picturesque locale, inviting everyone to bask in the sun's warm embrace before the cooler months approach.
As summer transitions to autumn in Notre Dame, September brings a gentle decrease in daylight, offering 12 hours of sunlit inspiration. This follows the peak of 15 hours in June, when the days are long and lively. From there, daylight begins its gradual decline, with September maintaining a balance between the thriving warmth of summer and the cooler, shorter days that lie ahead. This shift signifies not just a change in light but also an invitation to embrace the beauty of early fall, as nature prepares for the upcoming seasonal transformation. Such rhythmic variations in daylight throughout the year are a reminder of the enchanting cycles that define life in Notre Dame.
As September sweeps into Notre Dame, the average wind speed gently rises to 3.5 m/s (8 mph), creating a refreshing transition from the calmer breezes of summer. This slight increase mirrors a broader trend observed throughout the year, where wind speeds typically pick up as we move from the warmer months to the chillier embrace of autumn. Notably, September's winds are akin to those in April and October, suggesting a consistent pattern of mild gusts during this time of year. As the vibrant hues of fall begin to envelop the landscape, the invigorating wind serves as a reminder of the changing seasons and the anticipation of the briskness to come.
The weather in Notre Dame changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Notre Dame and find detailed weather information for every month.
September and January present strikingly different weather patterns. In September, temperatures range from a mild 3°C (38°F) at night to a warm 34°C (93°F) during the day, with an average of 19°C (67°F). The month experiences about 79 mm (3.1 in) of precipitation over 9 days and a humidity level of 78%, making it feel quite comfortable. In contrast, January is characterized by much colder temperatures, dipping as low as -26°C (-15°F) and averaging -3°C (28°F), with a maximum of 17°C (63°F). Although January sees slightly less precipitation at 73 mm (2.9 in) over 11 days, the humidity rises to 85%, contributing to a much harsher and chillier atmosphere. For more details on the conditions during this winter month, check out Notre Dame weather in January.
September and February present stark contrasts in weather patterns. In September, temperatures range from a cool 3°C (38°F) at night to a warm 34°C (93°F) during the day, averaging 19°C (67°F). The month experiences about 79 mm (3.1 in) of precipitation over approximately 9 days, with humidity levels sitting at 78%. In contrast, February brings much colder conditions, with temperatures dropping to a minimum of -28°C (-18°F) and only reaching a high of 19°C (67°F). The average temperature is notably lower at -2°C (29°F), with 75 mm (2.9 in) of precipitation over 12 days and a higher humidity of 85%. For a closer look at February weather, visit Notre Dame weather in February.
In September, temperatures vary significantly, with a minimum of 3°C (38°F) and an average of 19°C (67°F), peaking at a warm 34°C (93°F). The month experiences moderate rainfall, with 79 mm (3.1 in) over about 9 days and relative humidity at 78%. In contrast, March sees much cooler temperatures, ranging from a low of -14°C (7°F) to a maximum of 25°C (78°F), with an average of only 4°C (39°F). Rainfall is slightly higher at 97 mm (3.8 in) spread over approximately 12 days, accompanied by a humidity level of 86%. For a more detailed look at March weather patterns, visit Notre Dame weather in March.
September and April exhibit distinct weather characteristics that reflect the transition between summer and autumn, and winter to spring, respectively. In September, temperatures range from a chilly low of 3°C (38°F) to a warm high of 34°C (93°F), with an average of 19°C (67°F), while April sees cooler conditions with a minimum of -8°C (18°F) and a maximum of 28°C (83°F), averaging at 9°C (48°F). Precipitation is higher in April, totaling 106 mm (4.2 in) over 14 days, compared to September's 79 mm (3.1 in) over just 9 days. Additionally, humidity levels are slightly higher in April at 87%, compared to September's 78%. For more detailed insights, you can check the Notre Dame weather in April.
When comparing the weather in September and May, there are notable differences in temperature and precipitation patterns. September boasts a warmer average temperature of 19°C (67°F), with max temperatures reaching up to 34°C (93°F), while May has a cooler average of 16°C (61°F) and similarly high max temperatures of 35°C (94°F). Precipitation is more prevalent in May, accumulating 161 mm (6.3 in) over 15 days compared to September's 79 mm (3.1 in) and 9 days of rainfall. Additionally, both months experience high humidity, with May slightly edging out at 81% compared to September’s 78%. For more specific insights into May's weather patterns, you can check the details at Notre Dame weather in May.
In comparing the weather between September and June, it becomes clear that both months exhibit warm temperatures, though June averages slightly higher at 22°C (72°F), compared to September's average of 19°C (67°F). Additionally, while September's maximum temperature reaches up to 34°C (93°F), June can peak even higher, hitting 35°C (95°F). Precipitation levels are notably different as well, with June experiencing 139 mm (5.5 in) over 13 days, in contrast to September's 79 mm (3.1 in) across 9 days. Humidity levels are fairly similar, with September at 78% and June slightly higher at 82%. For a more detailed look at the specific weather patterns, you can check Notre Dame weather in June.
September weather shows a wider range in temperatures compared to July, with daily averages dipping from July's minimum of 13°C (55°F) to a cooler minimum of 3°C (38°F) while maintaining the same maximum of 34°C (93°F). Additionally, September experiences slightly less precipitation, with 79 mm (3.1 in) over 9 days, compared to July's 117 mm (4.6 in) over 12 days. Humidity remains high in both months, with September at 78% and July at 81%. Overall, while both months can reach warm temperatures, September offers a more varied climate with a noticeable drop in early morning temperatures. For more detailed information, you can check Notre Dame weather in July.
In comparing the weather of September and August, we see a notable shift in temperatures and precipitation. September experiences a wider range, with minimum temperatures dropping to 3°C (38°F) and maximums reaching 34°C (93°F), while August maintains milder lows at 9°C (49°F) and highs of 33°C (92°F). Precipitation also decreases in September to 79 mm (3.1 in) over 9 days, compared to August’s higher total of 109 mm (4.3 in) across 12 days. Despite these variations, humidity levels remain nearly identical, with September at 78% and August slightly higher at 79%. For more detailed information, you can check Notre Dame weather in August.
In September, the weather is generally warmer with average temperatures around 19°C (67°F), ranging from a minimum of 3°C (38°F) to a maximum of 34°C (93°F). This month experiences a relatively moderate amount of rainfall, totaling 79 mm (3.1 in) over about 9 days and boasting a humidity level of 78%.
In contrast, October marks a notable shift as temperatures drop, with averages around 13°C (55°F) and a minimum temperature reaching -2°C (29°F). Rainfall increases significantly to 136 mm (5.4 in) spread across 14 days, and humidity also rises slightly to 81%. The transition from the warmth of September to the cooler, wetter conditions of October is evident, making this a time of significant climatic change. For more details specifically related to weather in October, you can check out Notre Dame weather in October.
September and November present strikingly different weather patterns. In September, temperatures range from a mild 3°C (38°F) at night to a warm 34°C (93°F) during the day, creating an average of 19°C (67°F). The month sees moderate rainfall, accumulating 79 mm (3.1 in) over about nine days with a humidity level of 78%. Conversely, November plunges into colder conditions, with nighttime lows reaching -13°C (9°F) and daytime highs peaking at 24°C (76°F), resulting in an average of just 4°C (40°F). Although it has slightly less precipitation at 74 mm (2.9 in) over ten days, the humidity increases to 89%. For a deeper understanding of November weather conditions, you can refer to Notre Dame weather in November.
In September, the weather is significantly warmer, with temperatures ranging from a minimum of 3°C (38°F) to a maximum of 34°C (93°F), and an average of 19°C (67°F). The humidity sits at 78%, and the month experiences about 79 mm (3.1 in) of precipitation over 9 days. In contrast, December brings much colder conditions, with temperatures dropping to a minimum of -21°C (-6°F) and only rising to a maximum of 17°C (63°F), averaging around 1°C (34°F). The humidity increases to 86%, and while December has less total precipitation at 62 mm (2.5 in), it spans about 10 days. For more detailed insights into December weather, check out Notre Dame weather in December.
As September rolls in, Notre Dame experiences a remarkable transition in weather, with temperatures beginning to cool from the summer highs while still offering some warm days. This month is marked by a mix of humidity and occasional rainfall, making it distinct from the drier summer months. With an average temperature that leans towards the cooler side, the atmosphere becomes more refreshing, ideal for outdoor activities and campus life. However, the added chance of precipitation and a noticeable increase in cloud cover signal the gradual shift towards a more autumnal climate. Whether you're strolling through campus or enjoying a football game, September offers a unique blend of warmth and the refreshing hints of fall. For a deeper understanding of what to expect throughout the year, visit Notre Dame Climate.