Last updated: February 24, 2025
September in Big Pine Key, United States offers a tropical escape with highs reaching 30°C (87°F) and an average temperature of 28°C (83°F), providing warm days for sun-seekers. However, it’s a month marked by considerable rainfall, with 192 mm (7.6 in) falling over 19 days, resulting in a humid atmosphere with levels around 76%. Visitors can expect a blend of sun and showers, making it essential to plan for both sunshine and rain while enjoying the lush surroundings of this island paradise.
In September, Big Pine Key enjoys warm and inviting temperatures, making it a lovely time for outdoor activities. The minimum temperature settles at a comfortable 25°C (77°F), with afternoons averaging around 28°C (83°F), while the maximum reaches up to 30°C (87°F). This month marks a slight increase in temperatures compared to the previous months, aligning with the transition into fall but still retaining the balmy vibe of summer. As September progresses, the warm climate continues to entice visitors, creating a perfect backdrop for exploring the stunning natural beauty of the Florida Keys. It's a month where the heat is softened by the ocean breezes, making it an ideal time for beach days and sunset strolls.
In September, Big Pine Key experiences a significant uptick in precipitation, with 192 mm (7.6 in) recorded over 19 days. This marked increase follows the summer months, which already see consistent rainfall, peaking from May to August. Notably, September’s rainfall is the highest of the year, intensifying the tropical atmosphere as the region transitions into the fall season. This trend highlights the peak of the wet season, where the frequency of rainy days rises, emphasizing the importance of preparation for sudden downpours and their potential impact on outdoor activities. The climatological pattern suggests that as summer humidity lingers, September serves as a vibrant reminder of nature's unpredictability in this tropical locale.
In September, Big Pine Key experiences a humidity level of 76%, marking a slight rise from the drier months of summer. This uptick is consistent with a broader trend observed throughout the year, where humidity levels begin to increase as the fall approaches. Following the peak of summer, characterized by lower humidity, September serves as a transition back to the more humid conditions typical of the late year. The humidity begins to climb again in October, reaching 79%, emphasizing Big Pine Key's tropical climate that endures through the latter part of the year, with January and December both seeing similar levels of 81% as the humid season resurfaces. Overall, the trend illustrates a gradual ebb and flow of moisture in the air, contributing to the region's lush environment.
In September, Big Pine Key experiences a high level of sun intensity with a UV Index of 12, categorized as extreme, indicating urgent precautions for sun exposure. This peak is consistent with the summer months, as both June through August also marked the same UV Index of 12. Notably, despite the changing seasons, the burn time remains alarmingly short at just 10 minutes, urging residents and visitors alike to be vigilant about sun safety. As the sun begins to transition into autumn, October brings a slight decrease to a UV Index of 10, yet it's clear that September retains its summer-like sun intensity. For a detailed insight into UV patterns throughout the year, check out Big Pine Key UV Index.
UV Risk Categories
September in Big Pine Key brings a delightful blend of warm weather and generous sunshine, featuring an impressive 318 hours of sunlight. As summer peaks in July with the highest number of hours at 348, the sun begins to gently wane in September, yet it still offers a vibrant glow, keeping the outdoors inviting. This month acts as a beautiful transition from the sizzling summer, maintaining ample daylight while hinting at the cooler fall days ahead. With consistent sunlight throughout the year, September stands as a reminder of the region's radiant charm, making it a perfect time for outdoor adventures or simply soaking in the sun's warmth by the shimmering waters.
In Big Pine Key, the likelihood of enjoying sunny weather in September is moderately low at 34%, marking a drop from the sunnier months earlier in the year. This trend reflects a general pattern; as summer wanes, the sunny days decrease significantly, with June hitting a low of only 19%. The peak sunshine months of February through April boast chances above 60%, while September stands as one of the transitional months before the more favorable fall weather returns in October and November, which see improved odds of clear skies at 51% and 52%, respectively. Thus, while September may not be the sunniest time of the year in Big Pine Key, it offers a brief reprieve before the sunshine returns in the fall.
As September rolls in, Big Pine Key enjoys a pleasant 12 hours of daylight, a continuation of the balanced sunlight seen in the late summer months. Following the height of summer, where daylight peaked at 13 hours from May to July, the gradual dimming begins as autumn approaches. This shift reflects a natural decline, with daylight reducing each month heading into fall. October will soon bring slightly shorter days, but for now, the lingering warmth and ample light of September provide an inviting atmosphere, perfect for outdoor activities and enjoying the vibrant surroundings.
In September, the winds in Big Pine Key begin to ease, with an average speed of just 3.5 m/s (8 mph)—the lightest of the year. Following the more spirited winds typical of the spring and summer months, where speeds hovered around 5.5 to 6.5 m/s, September's gentle breeze marks a notable shift towards the calmer days of fall. This decline in wind speed may invite leisurely outdoor activities, as residents and visitors alike bask in the warm, tranquil atmosphere, making the most of the transition into autumn. As the year progresses towards October, winds tend to pick up again, suggesting that September serves as a brief, serene interlude in the region's climatic rhythm.
The weather in Big Pine Key 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 Big Pine Key and find detailed weather information for every month.
In September, the weather is notably warmer, with average temperatures ranging from a minimum of 25°C (77°F) to a maximum of 30°C (87°F), alongside significant precipitation of 192 mm (7.6 in) over 19 days. This month experiences high humidity levels at 76%, creating a tropical atmosphere. In contrast, January offers a much cooler climate, with temperatures ranging from a minimum of 11°C (52°F) to a maximum of 26°C (79°F). Precipitation is significantly lower at 25 mm (1.0 in) over just 4 days, and humidity is slightly higher at 81%. For a more detailed look at January weather, you can visit Big Pine Key weather in January.
In September, the weather is significantly warmer, with minimum temperatures around 25°C (77°F) and averages peaking at 28°C (83°F). The month experiences heavy rainfall, accumulating 192 mm (7.6 in) over approximately 19 days, leading to a humid atmosphere with an average humidity of 76%. In contrast, February brings milder temperatures, with a minimum of 15°C (59°F) and an average of 23°C (73°F), providing more comfortable conditions. Rainfall is much lighter, totaling just 28 mm (1.1 in) over about 5 days, while humidity increases slightly to 79%. For a more detailed look at February conditions, check out Big Pine Key weather in February.
In September, temperatures are significantly warmer, with a minimum of 25°C (77°F) and an average of 28°C (83°F), reaching a maximum of 30°C (87°F). However, this month also brings high precipitation, averaging 192 mm (7.6 in) over 19 days, resulting in a humid environment with 76% humidity. In contrast, March experiences cooler temperatures, with a minimum of 16°C (60°F) and an average of 23°C (74°F), peaking at 26°C (80°F). Precipitation is markedly lower in March, with only 17 mm (0.7 in) occurring over just 2 days, while humidity remains constant at 76%. For a detailed look at March weather, you can visit Big Pine Key weather in March.
In comparing the weather of September and April, September tends to be considerably warmer and wetter. With average temperatures reaching 28°C (83°F) and maximums of 30°C (87°F), it is notably hotter than April, which sees average temperatures of 25°C (77°F) and maximums around 29°C (84°F). Additionally, September experiences substantial rainfall, accumulating 192 mm (7.6 in) over 19 days, while April is significantly drier, with only 45 mm (1.8 in) of precipitation over just 7 days. Moreover, humidity levels in September are slightly higher at 76%, compared to 73% in April. For those interested in specific weather patterns during April, you can find more information here.
When comparing the weather in September and May, September tends to be warmer and more humid. In September, temperatures range from a minimum of 25°C (77°F) to a maximum of 30°C (87°F), with an average temperature of 28°C (83°F). The month experiences significant rainfall, with 192 mm (7.6 in) of precipitation over 19 days, contributing to a higher humidity level of 76%. In contrast, May has slightly cooler temperatures, with a minimum of 22°C (72°F) and a maximum of 29°C (84°F), averaging 26°C (79°F). May sees less precipitation, totaling 141 mm (5.6 in) across 11 days, and has a lower humidity of 71%. For more details on the weather specifics, check out Big Pine Key weather in May.
In comparing the weather of September and June, we find that both months experience similar average temperatures, hovering around 28°C (82°F). However, September tends to be slightly warmer, with maximum temperatures reaching up to 30°C (87°F), compared to June's peak of 31°C (88°F). Notably, September is characterized by higher precipitation levels, receiving 192 mm (7.6 in) across 19 days, while June sees significantly less rainfall at 111 mm (4.4 in) over 16 days. Additionally, September experiences higher humidity at 76%, in contrast to June's 69%. For a detailed breakdown of June's weather patterns, you can visit Big Pine Key weather in June.
In comparing the weather of September and July, both months feature similar temperature ranges, with minimums around 25°C (77°F) and averages near 28°C (83°F). However, July tends to be slightly warmer at its maximum, reaching up to 31°C (87°F), compared to September's peak of 30°C (87°F). Precipitation plays a significant role in defining these months; September experiences significantly higher rainfall with 192 mm (7.6 in) over 19 days, while July sees only 97 mm (3.8 in) over 17 days. Additionally, September carries a higher humidity level at 76%, compared to July's 70%. For more detailed information on July's weather, visit the following link: Big Pine Key weather in July.
In comparing the weather between September and August, we see some notable differences. September experiences a slightly cooler average temperature of 28°C (83°F) compared to August's average of 29°C (84°F), while both months share the same maximum temperature of 30°C (87°F). However, September is marked by significantly higher precipitation, with 192 mm (7.6 in) over 19 days, in contrast to August's 104 mm (4.1 in) over 18 days. Additionally, humidity rises in September, reaching 76%, compared to August's 72%. For more details about the weather during August, you can check Big Pine Key weather in August.
In comparing the weather between September and October, September tends to be warmer with minimum temperatures around 25°C (77°F) and an average of 28°C (83°F), while October sees cooler minimums at 19°C (67°F). The maximum temperatures are slightly lower in October, peaking at 29°C (85°F) compared to September's 30°C (87°F). Additionally, September experiences higher precipitation levels, measuring 192 mm (7.6 in) over 19 days, in contrast to October's 131 mm (5.1 in) across 18 days. Humidity also rises slightly in October, averaging 79% compared to September's 76%. For more detailed insights, you can check Big Pine Key weather in October.
September weather tends to be warm and humid, with average temperatures around 28°C (83°F) and daily highs reaching up to 30°C (87°F). The month is marked by significant rainfall, accumulating about 192 mm (7.6 in) over 19 days. In contrast, November brings a noticeable drop in temperature, with an average of 25°C (77°F) and maximums of 28°C (83°F). Precipitation also decreases significantly, with only 68 mm (2.7 in) over 9 days. Despite the cooler temperatures, November maintains a slightly higher humidity at 80%. For more details on November's weather, you can check this link: Big Pine Key weather in November.
In September, the weather tends to be significantly warmer and more humid, with average temperatures around 28°C (83°F) and high humidity levels of 76%. The month experiences considerable rainfall, totaling 192 mm (7.6 in), spread over 19 days, creating a lush, tropical atmosphere. In contrast, December brings a noticeable drop in temperature, with averages around 23°C (73°F) and a minimum of 14°C (58°F). The humidity rises slightly to 81%, but the rain is minimal, with only 39 mm (1.6 in) falling over just 5 days. For a more detailed look at December weather in this region, you can refer to Big Pine Key weather in December.
As September unfolds, Big Pine Key is graced with warm temperatures and elevated humidity levels, setting it apart from the more temperate months preceding it. The average temperature hovers around a balmy 28°C (83°F), with notably higher rainfall, as 19 days see precipitation, totaling 192 mm (7.6 in). This shift not only brings lush greenery but also a vibrant atmosphere, making the island increasingly dynamic as the season progresses. For a deeper dive into this tropical climate, explore more at Big Pine Key Climate.