Last updated: February 24, 2025
In Clemson, United States, September showcases a dynamic weather pattern characterized by a maximum temperature peaking at 36°C (96°F), while the average hovers around 23°C (75°F), providing a warm and inviting climate. As the month progresses, temperatures dip to a minimum of 9°C (49°F), highlighting the transitional nature of fall. With a total precipitation amount of 130 mm (5.1 in) over 9 rainy days, the humidity levels remain relatively high at 76%, contributing to the lush greenery that enhances the region's natural beauty. This blend of warmth and occasional rainfall creates a unique atmosphere that captures the essence of September in Clemson.
September in Clemson, United States, marks a transition towards cooler days as summer starts to wane. With minimum temperatures averaging 9°C (49°F) and maximums peaking at an inviting 36°C (96°F), the month presents a delightful mix of warm afternoons and cooler evenings. The average temperature of 23°C (75°F) signifies a comfortable atmosphere perfect for outdoor activities as the humidity begins to ease off from the summer highs. This month sets the stage for autumn's arrival, offering a perfect balance between the lingering warmth of summer and the crispness of fall, making it a perfect time to enjoy the changing scenery of the region.
In September, Clemson experiences a moderate rainfall of 130 mm (5.1 in), making it one of the wetter months of the year. This precipitation is typically distributed over 9 days, showcasing a relatively efficient rain pattern. As summer transitions to fall, the rainfall in September remains consistent with the preceding months, contrasting with the drier conditions seen in June and July. Interestingly, the amount of precipitation here begins to rise again as October approaches, hinting at a seasonal shift. Overall, September serves as a pivotal month where lush greenery thrives under the nurturing drops, providing a beautiful backdrop as the leaves start to change.
As summer gives way to autumn, September in Clemson showcases a notable shift in humidity levels, dropping to 76%—the same as August. This decline marks a transition from the more muggy summer months, reflecting the overall trend of decreasing humidity as the year progresses. Following the humid spring months, which hover around 86%, September signals a more comfortable climate, paving the way for October's slight uptick to 80%. The gradual increase heading into the fall months suggests that while the air may feel fresher, the lingering warmth gradually gives way to the forthcoming chill of winter, evidenced by the significant rise back to 88% in November and December.
In September, Clemson experiences a UV Index of 9, categorizing the exposure as very high, with a burn time of just 15 minutes. This marks a slight decrease from the extremes of summer, where the UV Index peaked at 11 during June, July, and May. As summer transitions into fall, one can observe a trend of gradually reducing UV levels: from the intense rays of May and June to the high yet manageable indices in the subsequent months. Nonetheless, it's essential to remain vigilant and protect your skin as the sun still packs a punch this time of year. For more details, visit Clemson UV Index.
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As September unfolds in Clemson, the lingering warmth of summer shines brightly, contributing to an impressive 292 hours of sunshine. This month stands as a transition, bridging the sun-drenched days of July and August, which boast the highest sunshine hours at 347 and 314 hours, respectively. Contrast this with the cooler averages of fall, where October’s 266 hours and November’s 238 hours hint at the impending change. Interestingly, while sunshine hours generally peak in the summer, September retains a robust amount of sunlight, marking it as a vibrant time for outdoor activities and enjoying the picturesque surroundings before the crispness of autumn settles in.
In September, Clemson enjoys a promising 51% chance of sunny weather, marking a noticeable improvement from the summer months, which see a dip in sunshine likelihood. As the scorching heat of July and August recedes, this slight upswing creates an inviting atmosphere for outdoor activities. The transition into fall also brings with it a steady rise in probabilities leading into October, where the chance of sun remains consistent at 47%. With September's average hovering above half, it stands as a sweet spot for those looking to soak up the sun before the cooler months set in.
As September rolls into Clemson, the daylight begins its gentle decline, offering around 12 hours of sunlight each day. This marks a transition from the peak summer days of July and August, which bask in 14 hours of daylight, creating a noticeable shift in the length of daylight. Following the vibrant colors of summer, September provides a warm and comforting glow that hints at the upcoming autumn, as daylight hours steadily drop toward the shorter days of fall. The month serves as a buffer, with the fading brightness encouraging a reflective mood, while still retaining a generous share of light before winter approaches, bringing with it even shorter days of just 10 hours by November.
As September rolls in, the winds in Clemson, United States, offer a gentle transition from the summer heat, averaging a modest 1.8 m/s (4 mph). This slight uptick from August's calm breezes suggests a subtle revival of air movement after the slowest months of the year. Notably, September's wind speed mirrors the patterns of late fall and winter, hinting at the seasonal changes ahead. Overall, the winds in Clemson exhibit a gradual decline through the summer months, reaching their lowest in July and August, before a very slight increase as autumn approaches. With the winds picking up just a touch, September invites residents and visitors alike to enjoy the beautiful, crisp days ahead while embracing the gentle whispers of change.
The weather in Clemson 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 Clemson and find detailed weather information for every month.
September and January offer strikingly different weather experiences. In September, temperatures range from a mild 9°C (49°F) at night to a scorching 36°C (96°F) during the day, with an average of 23°C (75°F). Although it is relatively warm, the month also sees considerable precipitation, averaging 130 mm (5.1 in) across nine days, and humidity levels at 76%. In contrast, January brings much colder conditions, with temperatures dipping as low as -11°C (12°F) and averaging around 7°C (44°F). Although the maximum temperature reaches a mild 25°C (77°F), there is less rainfall, totaling 104 mm (4.1 in) over nine days, but the humidity is higher at 86%. For a closer look at what to expect, visit Clemson weather in January.
September and February present contrasting weather patterns. In September, temperatures are warmer, with an average of 23°C (75°F) and highs reaching up to 36°C (96°F). The month experiences significant humidity at 76% and around 130 mm (5.1 in) of precipitation over approximately 9 days. In contrast, February brings cooler conditions, with average temperatures dropping to 10°C (50°F) and a maximum of 26°C (79°F). This month records higher precipitation levels at 152 mm (6.0 in) spread across about 14 days, while humidity increases to 86%. For more details on February weather, check out Clemson weather in February.
September and March display distinct weather patterns that reflect the transition between summer and spring. In September, temperatures often range from a comfortable minimum of 9°C (49°F) to a warm maximum of 36°C (96°F), with an average of 23°C (75°F). This month experiences around 130 mm (5.1 in) of precipitation over approximately 9 days, coupled with a humidity level of 76%. In contrast, March temperatures start off significantly cooler, with a minimum of -4°C (24°F) and a maximum of 30°C (87°F), averaging 12°C (54°F). Precipitation is slightly less, at 111 mm (4.4 in), but occurs over a slightly higher number of days—12. The humidity in March rises to 86%, making it feel a bit more damp compared to September. Overall, these months not only showcase differing temperature extremes but also vary in precipitation and humidity, highlighting the unique climate characteristics of each. For more details, check out Clemson weather in March.
When comparing the weather in September and April, we see notable differences in temperature and humidity. September boasts a much warmer average temperature of 23°C (75°F) with maximum temperatures reaching up to 36°C (96°F), while April has a cooler average of 16°C (62°F) and peak temperatures of 30°C (86°F). Both months experience similar precipitation levels, around 130 mm (5.1 in), with rain falling on approximately nine days. However, the humidity is slightly higher in April at 82%, compared to September's 76%. For more detailed information on April weather, you can check out Clemson weather in April.
In comparing the weather of September and May, we see that September tends to be warmer overall, with average temperatures reaching 23°C (75°F) and maximums soaring to 36°C (96°F). In contrast, May has a slightly cooler average temperature of 21°C (70°F) and max temperatures reaching 34°C (94°F). Both months experience considerable precipitation, with September averaging 130 mm over 9 days and May receiving slightly more at 135 mm over 11 days. Additionally, May has a higher humidity level at 85%, compared to September's 76%. For more detailed insights, check out Clemson weather in May.
When comparing the weather in September and June, September tends to have slightly more extreme temperatures, with a minimum of 9°C (49°F) and a maximum of 36°C (96°F) compared to June’s range of 12°C (54°F) to 34°C (93°F). Both months have similar average temperatures, with September averaging 23°C (75°F) and June averaging 24°C (76°F). However, September experiences more precipitation overall, with 130 mm (5.1 in) falling over 9 days, while June sees less rain with 84 mm (3.3 in) over 14 days. Humidity is also higher in June at 85% compared to September’s 76%. For more specifics about June weather, check out Clemson weather in June.
When comparing the weather in September to that of July, notable differences emerge. September typically sees a wider range of temperatures, with a minimum of 9°C (49°F) and a maximum reaching 36°C (96°F), averaging around 23°C (75°F). This month also experiences higher precipitation, totaling 130 mm (5.1 in) over approximately 9 days, resulting in a humidity level of 76%. In contrast, July presents a milder minimum temperature of 16°C (60°F) and a more stable maximum of 35°C (96°F), with an average temperature of 27°C (80°F). This month is characterized by less precipitation, averaging 83 mm (3.3 in) but spread across 14 days, leading to higher humidity at 83%. For more details on July's weather, you can visit Clemson weather in July.
In comparing the weather of September and August, September experiences a notable drop in minimum temperature, with lows around 9°C (49°F), while August's minimum is significantly higher at 16°C (60°F). The average temperature in August is also warmer at 26°C (79°F) compared to September's average of 23°C (75°F). However, both months share the same maximum temperature of 36°C (97°F) in August and 36°C (96°F) in September. Precipitation in September is slightly higher at 130 mm (5.1 in) over 9 days, while August has 111 mm (4.4 in) spread over 12 days. Interestingly, humidity remains constant at 76% for both months. For more details about the weather in August, visit Clemson weather in August.
September and October present notable contrasts in weather conditions. In September, temperatures range from a minimum of 9°C (49°F) to a maximum of 36°C (96°F), with an average of 23°C (75°F). The month sees 130 mm (5.1 in) of precipitation over 9 days and maintains a humidity level of 76%. In contrast, October experiences cooler temperatures, with a minimum of 1°C (33°F) and an average of 18°C (65°F), while also peaking at a maximum of 37°C (98°F). Precipitation in October increases slightly to 142 mm (5.6 in) over 10 days, coupled with a rise in humidity to 80%. For more details on October weather, visit Clemson weather in October.
September and November present striking contrasts in weather patterns. In September, temperatures range from a mild 9°C (49°F) at night to a scorching 36°C (96°F) during the day, with an average of 23°C (75°F) and high humidity at 76%. It is typically a wetter month, experiencing about 130 mm (5.1 in) of precipitation over approximately 9 days. In contrast, November brings cooler conditions, with nighttime lows plunging to -4°C (24°F) and an average high of 11°C (52°F), peaking at 26°C (80°F). While November has less precipitation at around 93 mm (3.7 in) over 8 days, it also sees a significant increase in humidity, reaching 88%. For a more detailed overview of weather in November, check out Clemson weather in November.
September and December present contrasting weather patterns, showcasing the transition from warm summer to chilly winter. In September, temperatures range from a pleasant minimum of 9°C (49°F) to a sweltering maximum of 36°C (96°F), with an average of 23°C (75°F) and relatively high humidity at 76%. The month experiences notable rainfall, accumulating approximately 130 mm (5.1 in) over 9 days.
Conversely, December brings a significant drop in temperatures, with a minimum of -7°C (20°F) and a much cooler average of 8°C (47°F), while the maximum reaches a mild 24°C (75°F). Precipitation in December slightly increases to 136 mm (5.4 in), maintaining the same number of rainy days at 9 but with higher humidity at 88%. For more specific details on Clemson's weather in December, you can check out Clemson weather in December.
As September unfolds in Clemson, the weather strikes a balance between the lingering warmth of summer and the impending coolness of fall. With temperatures averaging around a comfortable 23°C (75°F), it's a refreshing shift from the peak summer heat. However, the month does not shy away from occasional highs, reaching up to a sweltering 36°C (96°F). While September sees around 130 mm of precipitation spread over 9 days, this is a precursor to the drier months ahead. The humidity, sitting at a notable 76%, adds to the mugginess that can accompany early autumn. For a deeper dive into Clemson’s unique climate patterns and how they define the changing seasons, explore Clemson Climate.