Last updated: February 24, 2025
September in Mount Pleasant, United States, showcases a blend of warmth and moisture, with maximum temperatures reaching 32°C (90°F) and an average of 26°C (79°F). The evenings cool down to a comfortable 16°C (61°F). However, this warm weather is often accompanied by significant rainfall, totaling 188 mm (7.4 in) over approximately 14 days, leading to a humid environment with an average humidity of 81%. This dynamic climate makes September a month of vibrant changes, perfect for experiencing the rich natural beauty of the area.
In September, Mount Pleasant experiences a delightful transition as summer gradually fades into fall. The minimum temperature settles at a comfortable 16°C (61°F), while the average climbs to a warm 26°C (79°F), peaking at a toasty 32°C (90°F) on the hottest days. This month marks a notable shift, as the warmth lingers from August, yet hints of cooler autumn days begin to emerge. With temperatures still elevated compared to the cooler months ahead, September offers the perfect opportunity for outdoor activities while savoring the last vestiges of summer. This rhythm of warmth and briskness sets a picturesque backdrop for shifting leaves and seasonal festivities.
In September, Mount Pleasant experiences a significant amount of precipitation, with 188 mm (7.4 in) falling over 14 days. This marks a slight decrease from the previous month of August, which recorded the highest rainfall of the year at 197 mm (7.8 in) across 21 days. The trend for September indicates a continuation of the wetter summer months, as rainfall generally peaks during the summer, particularly in July and August. This can be attributed to the warm temperatures and increased moisture during this time, which taper off into the fall. With October's precipitation dropping to 85 mm (3.4 in), it's clear that September serves as a transitional month, where the abundant summer rains begin to wane, but still provide essential moisture leading into the dryer autumn season.
In Mount Pleasant, United States, September experiences a considerable level of humidity at 81%, maintaining the relatively high moisture levels characteristic of the late summer months. This figure is consistent with the previous two months, as both July and August recorded humidity levels of 82% and 81%, respectively. The humidity subtly begins to taper off as autumn approaches, evidenced by October's projected drop to 78%. Notably, the annual humidity peaks in the colder months, with December reaching 84%, suggesting that while September retains summer's sultry embrace, the transition to drier conditions is just around the corner. Overall, September serves as a transitional month, balancing high humidity with the promise of autumn’s relief.
As summer transitions into fall, September in Mount Pleasant, United States, sees a notable decline in UV intensity, with a UV Index of 9, placing it in the very high exposure category. This is a slight drop from the extreme levels experienced in the peak summer months of June through August, where the UV Index reached levels of 11 and 12. While burn time increases to 15 minutes, it’s crucial to remain vigilant about sun protection, as the sun's rays can still be quite damaging. September serves as a reminder that even as temperatures cool, the potential for skin damage remains significant. To stay informed on UV levels and protect yourself effectively, check out the detailed insights on the Mount Pleasant UV Index.
UV Risk Categories
September in Mount Pleasant is a delightful transition from summer to autumn, basking in 304 hours of sunshine that beautifully bridges the warm days of July and August with the cooler months ahead. With a slight dip from the peak summer sunshine in July, which boasts an impressive 345 hours, September still offers ample daylight, ensuring outdoor adventures remain vibrant. This trend of diminishing yet significant sunlight extends into October, where the hours decrease to 294 but maintain a generous glow for those looking to savor the changing leaves and crisp air. As the year progresses, sunshine hours gradually retreat, hinting at the cozy months of winter to come, yet September stands out as a month that perfectly balances warmth and the beginning of seasonal change.
In Mount Pleasant, September offers a 52% chance of sunny weather, making it one of the more favorable months for sunshine as summer transitions to fall. This is a modest increase from the typically dreary summer months of June and August, which experienced significantly lower chances of sun at 30% and 32%, respectively. Notably, September's sun probability is only slightly below that of October at 50%, indicating that as the year progresses, the likelihood of clear days tends to stabilize. Furthermore, it's encouraging to see how September's weather potential stands in contrast to February and March, where sunny days are less likely, at 39% and 38%. Overall, September emerges as a delightful opportunity to enjoy the outdoors before the colder months set in.
As September unfolds in Mount Pleasant, the days begin to shorten, offering a gentle transition from the sun-drenched summer months into the cooler embrace of autumn. With 12 hours of daylight, September sees a decline from the 14 hours enjoyed in July and June, marking a shift towards the shorter days of fall. This gradual reduction in daylight not only reflects the changing seasons but also sets the stage for the cozy, reflective mood that accompanies the arrival of October. As daylight wanes, it invites residents to savor the beauty of early fall, where crisp air and vibrant foliage provide a stunning backdrop to the shorter days ahead.
As September unfolds in Mount Pleasant, a noticeable shift in wind patterns becomes evident. The average wind speed drops to 4.0 m/s (9 mph), marking a gentle decline from the summer’s breezy days when August recorded its lowest speed of 3.9 m/s (9 mph). Throughout the year, wind speeds tend to vary, peaking in January, March, and May at around 5.2 m/s (12 mph). The seasonal transition brings a softening of summer's gusts, hinting at a calmness as autumn approaches. This constant ebb and flow create a unique backdrop, making September a serene time to experience the gentle whispers of the wind in Mount Pleasant.
The weather in Mount Pleasant 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 Mount Pleasant and find detailed weather information for every month.
September and January present stark contrasts in weather. In September, temperatures range from a mild 16°C (61°F) to a warm 32°C (90°F), with an average of 26°C (79°F), making it one of the warmer months. The humidity is notably high at 81%, and the month sees significant rainfall, totaling 188 mm (7.4 in) across 14 days. In contrast, January experiences much cooler weather, with temperatures dropping to a minimum of -5°C (24°F) and reaching a maximum of 21°C (70°F), averaging 12°C (53°F). Precipitation is less frequent, accumulating to 66 mm (2.6 in) over just 8 days, while humidity remains relatively high at 83%. For more detailed insights, check out Mount Pleasant weather in January.
September and February present contrasting weather conditions. In September, temperatures range from a mild 16°C (61°F) at night to a warm 32°C (90°F) during the day, with an average of 26°C (79°F). The month is characterized by significant rainfall, receiving around 188 mm (7.4 in) over 14 days and maintaining high humidity levels at 81%. In stark contrast, February offers much cooler temperatures, with nighttime lows dropping to 2°C (36°F) and daytime highs peaking at 21°C (70°F), averaging 14°C (57°F). The precipitation in February is lower at 91 mm (3.6 in) over 11 days, with humidity slightly lower at 79%. For a detailed look at weather patterns in February, you can refer to Mount Pleasant weather in February.
The weather in September is noticeably warmer than in March, with average temperatures soaring to around 26°C (79°F) compared to a cooler 15°C (60°F) in March. September experiences maximum temperatures that can reach up to 32°C (90°F), while March tops out at 23°C (74°F). Additionally, September is characterized by higher precipitation, totaling 188 mm (7.4 in) over 14 days, whereas March sees significantly less rainfall at 62 mm (2.4 in) over just 7 days. Both months have similar humidity levels, with September at 81% and March slightly lower at 79%. For more details on March weather, you can visit Mount Pleasant weather in March.
In comparing the weather of September and April, September emerges as a warmer month with average temperatures peaking at 26°C (79°F) and a maximum of 32°C (90°F), while April's temperatures are notably cooler, averaging 19°C (66°F) with a maximum of 27°C (81°F). September also sees higher humidity levels at 81%, compared to April’s slightly lower 78%. Additionally, September experiences more substantial rainfall, totaling 188 mm (7.4 in) over 14 days, whereas April has only 105 mm (4.1 in) across 8 days. For more detailed insights, you can check Mount Pleasant weather in April.
When comparing the weather in September to that of May, there are notable differences in temperature and precipitation. September tends to be warmer, with average temperatures around 26°C (79°F) and maximums reaching up to 32°C (90°F), while May's average temperature is slightly cooler at 23°C (74°F) with a maximum of 31°C (89°F). Additionally, September experiences significantly more rainfall, averaging 188 mm (7.4 in) over approximately 14 days, compared to May's 82 mm (3.2 in) over 8 days, leading to a more humid atmosphere in September at 81% versus 78% in May. For more detailed information on May weather, you can check Mount Pleasant weather in May.
When comparing the weather in September to that in June, we notice that both months share similar average temperatures, hovering around 26°C (79°F). However, September tends to have slightly warmer minimum and maximum temperatures, with lows of 16°C (61°F) and highs reaching up to 32°C (90°F), compared to June's minimum of 18°C (64°F). Precipitation levels are higher in September, totaling 188 mm (7.4 in) over 14 days, whereas June sees less rainfall at 144 mm (5.7 in) across 17 days. Additionally, humidity levels are marginally higher in September at 81% compared to June's 78%. For more detailed information, you can explore Mount Pleasant weather in June.
In September, the weather is characterized by slightly cooler temperatures with a minimum of 16°C (61°F) compared to July's warmer minimum of 22°C (72°F). The average temperatures are similar, averaging 26°C (79°F) in September and 27°C (81°F) in July, with both months peaking at around 32°C (90°F for September and 89°F for July). Precipitation is higher in September at 188 mm (7.4 in) over 14 days, while July has 171 mm (6.7 in) spread across 16 days. Humidity levels are comparable, with September showing 81% and July at 82%. For more specific details about July, you can check Mount Pleasant weather in July.
In comparing the weather between August and September, we notice some distinct differences. September experiences slightly cooler temperatures, with a minimum of 16°C (61°F) and an average of 26°C (79°F), while August is warmer, starting at a minimum of 23°C (73°F) and averaging 27°C (81°F). Although September has very similar maximum temperatures—32°C (90°F) compared to August's 31°C (89°F)—it sees more precipitation days, with rainfall occurring on 14 days in September versus 21 days in August. Both months share a consistent humidity level of 81%, contributing to a sultry atmosphere. For further details, you can check out Mount Pleasant weather in August.
September brings warmer temperatures, with averages around 26°C (79°F) and highs reaching up to 32°C (90°F), while October cools down significantly, featuring an average temperature of 23°C (73°F) and maximums of 29°C (85°F). The humidity remains relatively high in both months, but September sees slightly more at 81% compared to October’s 78%. Rainfall also differs markedly, with September receiving 188 mm (7.4 in) over 14 days, making it a wetter month, whereas October has only 85 mm (3.4 in) over 10 days. For those looking to know more about the weather, check out the details here: Mount Pleasant weather in October.
September typically boasts warmer temperatures with a minimum of 16°C (61°F) and an average of 26°C (79°F), reaching highs of 32°C (90°F). This month also sees significant rainfall, accumulating 188 mm (7.4 in) over about 14 days and maintaining a humidity level of 81%. In contrast, November experiences a noticeable drop in temperatures, with minimums dipping to 3°C (38°F) and an average temperature of 16°C (62°F), while the maximum reaches a milder 26°C (79°F). Precipitation in November is lower, at 103 mm (4.1 in) over 8 days, and humidity remains slightly elevated at 82%. For a more detailed look at November weather, visit Mount Pleasant weather in November.
In September, the weather is characterized by warmer temperatures, with averages around 26°C (79°F) and a maximum of 32°C (90°F), while December sees cooler temperatures, with an average of 13°C (56°F) and a high of 22°C (72°F). September also experiences more significant rainfall, with 188 mm (7.4 in) over 14 days, compared to December's 141 mm (5.6 in) over just 10 days. Humidity remains relatively high in both months, recorded at 81% in September and slightly higher at 84% in December. For more details on the December climate, you can check Mount Pleasant weather in December.
As September arrives in Mount Pleasant, it brings a distinct shift in weather patterns, characterized by warm temperatures that can peak at a sweltering 32°C, while the humidity levels remain high at 81%. This month is notably wetter, with frequent rain showers disrupting the late summer heat, accumulating around 188 mm of precipitation over approximately half of the days. Compared to the drier, hotter months of mid-summer, September offers a refreshing blend of warmth and moisture, making it a unique time to experience the lush landscapes of the region. For more insights on how this month fits into the broader climate context, explore our detailed overview at Mount Pleasant Climate.