Last updated: February 24, 2025
In September, Sag Harbor experiences a delightful transition into fall, with maximum temperatures reaching a comfortable 26°C (79°F) and an average hovering around 20°C (69°F). As the days grow cooler, nighttime temperatures can dip to a mild 12°C (55°F). This month brings approximately 99 mm (3.9 in) of rain across 10 days, contributing to the area's lush scenery and vibrant autumn hues. With an average humidity level of 75%, the air remains pleasantly crisp, making it an ideal time for outdoor activities and enjoying the picturesque charm of this coastal town.
In September, Sag Harbor experiences a delightful transition as summer begins to wane. With minimum temperatures averaging 12°C (55°F) and rising to a comfortable maximum of 26°C (79°F), the early autumn days offer a pleasant blend of warmth and cooling breezes. The average temperature of 20°C (69°F) creates an inviting atmosphere, perfect for enjoying the local scenery and outdoor activities before the chill of October sets in. As the summer heat recedes, September's mild conditions encourage leisurely strolls and gatherings, making it a picturesque time in this charming coastal town.
September in Sag Harbor welcomes a transition towards the wetter autumn months, with precipitation measuring 99 mm (3.9 in), spread over 10 days. This marks a slight decrease from the summer's average, as August recorded 103 mm (4.0 in). The consistent rainfall hints at the changing seasons, as this month prepares the landscape for October's considerably heavier 160 mm (6.3 in) rainfall. After a drier June with only 72 mm (2.9 in), September's precipitation reflects a return to the more typical rainfall patterns characteristic of late summer and early fall. This trend showcases the fluctuating nature of Sag Harbor's climate, where the transition into autumn brings a renewed rhythm of rain that nourishes the region's verdant surroundings.
In September, Sag Harbor experiences a slight dip in humidity, averaging at 75%. This marks a continuation of the gradual decrease that begins in the warmer months, following August’s humidity level of 76%. As summer transitions into autumn, the shifting patterns reveal a trend towards drier air, contrasting with the 84% humidity seen in the winter months of January and February. Overall, the September climate provides a refreshing break from the high humidity of the summer, making it an ideal time for outdoor activities while hinting at the return of more moisture-laden air in the coming months.
As September rolls into Sag Harbor, the UV Index remains significant, measuring 8, which indicates a very high exposure category. This trend mirrors the preceding summer months when UV levels peaked at 10, reflecting the region's strong sunlight. As we transition from the high summer sun to early fall, the burn time stays notably brisk at around 15 minutes, meaning that even brief outdoor activities can lead to skin damage without proper protection. With the UV Index gradually decreasing in the upcoming months, it’s essential to remain vigilant during September. For detailed information on UV levels and safety measures, visit Sag Harbor UV Index.
UV Risk Categories
September in Sag Harbor ushers in a delightful transition from the intense summer sunshine to milder autumn days, offering 281 hours of brilliant daylight. Though this marks a notable decrease from the sun-drenched July and August, with their peaks of 349 and 327 hours respectively, September still boasts more sunshine than many earlier months. This gradual decline hints at the seasonal shift, echoing a broader trend of increasing daylight hours from the winter's low of 153 in January to the summer's vibrant heights. As the days grow shorter, the lingering warmth of late summer invites residents and visitors alike to savor the beauty of Sag Harbor's early fall, rich with color and character.
In Sag Harbor, September offers a balanced chance of sunny weather, with a 49% likelihood of sunshine, paralleling the figures seen in both January and April. This stability suggests that as summer transitions into fall, residents and visitors can still enjoy a fair amount of bright days. Interestingly, while September's chances are consistent, they are markedly higher than the preceding months of June (41%) and August (35%), hinting at a lingering summer vibe. This trend of fluctuating sunshine continues into the autumn months, as October sees a slight dip to 46%, illustrating the gentle shift toward cooler weather. Overall, September serves as a pleasant bridge between the sunny days of summer and the crispness of fall, inviting outdoor activities amidst delightful warmth.
As summer bids farewell, September in Sag Harbor experiences a gradual reduction in daylight, offering approximately 12 hours of sunshine per day. This marks a subtle decline from the peak of 15 hours in June and 14 hours in July, emphasizing a transition from the vibrant long days of summer to the shorter ones of fall. Following the rhythms of nature, daylight continues to wane in October, dipping to 11 hours, paving the way for the cozy, introspective months ahead. This ebb and flow of sunlight not only reflects the changing season but also invites residents to savor the beauty of each shorter day.
As summer fades, September in Sag Harbor ushers in a welcome shift in the breeze, with average wind speeds rising to 6.1 m/s (14 mph). This marks a subtle increase from the calmer, languid winds of July and August, which hover around 4.8 m/s (11 mph). The transition into autumn begins to reveal a more invigorating atmosphere, setting the stage for the picturesque fall scenery. Following September, the winds pick up slightly throughout October and November, suggesting a dynamic change in the seasonal dance of the elements. Overall, this month bridges the serene summer breezes to the brisk winds that characterize the ensuing autumn months, embodying a refreshing shift in Sag Harbor's coastal charm.
The weather in Sag Harbor 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 Sag Harbor and find detailed weather information for every month.
When comparing the weather in September and January, a stark contrast is evident. September features milder temperatures, with a minimum of 12°C (55°F), an average of 20°C (69°F), and a maximum of 26°C (79°F). The month sees some rain, totaling 99 mm (3.9 in) over approximately 10 days, with humidity at 75%. In sharp contrast, January experiences a significant drop in temperatures, with a chilly minimum of -13°C (8°F), an average of 2°C (37°F), and a maximum of 13°C (56°F). While precipitation is slightly less at 89 mm (3.5 in) over 9 days, humidity remains higher at 84%. For further insights into January weather specifics in Sag Harbor, visit Sag Harbor weather in January.
September and February present stark contrasts in weather patterns. In September, temperatures range from a mild 12°C (55°F) at night to a pleasant 26°C (79°F) during the day, accompanied by a humidity level of 75%. Rainfall is moderate, with around 99 mm (3.9 in) over approximately 10 days. In contrast, February is much colder, with nighttime lows plummeting to -12°C (11°F) and daytime highs only reaching 12°C (53°F). Humidity increases to 84%, and precipitation is slightly higher, totaling 123 mm (4.8 in) over 11 days. For a more detailed look at February weather, you can visit Sag Harbor weather in February.
Comparing the weather in September and March reveals significant differences in temperature and overall conditions. September enjoys milder temperatures, with averages around 20°C (69°F) and highs reaching up to 26°C (79°F), making it a comfortable month. In contrast, March experiences much cooler weather, with an average temperature of just 4°C (39°F) and maximum temperatures only reaching 15°C (59°F).
Precipitation levels are slightly higher in March, totaling 113 mm (4.5 in), compared to September's 99 mm (3.9 in), though both months see rainfall on about 10 days. Moreover, humidity is notably higher in March at 82% compared to 75% in September, contributing to a damp chill. For more detailed insights on March weather, you can check Sag Harbor weather in March.
When comparing the weather in September and April, it's clear that September enjoys milder temperatures, ranging from a minimum of 12°C (55°F) to a maximum of 26°C (79°F), with an average of 20°C (69°F). In contrast, April starts off much cooler, with temperatures ranging from 0°C (33°F) to a maximum of 16°C (61°F), averaging just 8°C (47°F). Additionally, September sees less precipitation, with 99 mm (3.9 in) over about 10 days, compared to April's 137 mm (5.4 in) over 12 days. The humidity is fairly comparable, with September at 75% and April slightly higher at 79%. For a more detailed look at weather patterns, you can visit Sag Harbor weather in April.
In comparing the weather of September and May, September offers milder temperatures with a minimum of 12°C (55°F) and an average high of 26°C (79°F), making it generally warmer than May, which sees a minimum of only 4°C (39°F) and an average high of 20°C (69°F). Both months experience high humidity levels of 75%, but September typically has less precipitation, with 99 mm (3.9 in) over about 10 days, compared to May’s 129 mm (5.1 in) spread over 13 days. For a closer look at the weather specifics during May, you can check out Sag Harbor weather in May.
When comparing the weather in September and June, September tends to be slightly warmer, with average temperatures reaching 20°C (69°F) compared to June's average of 18°C (64°F). The maximum temperatures in September can reach up to 26°C (79°F), whereas June peaks at 24°C (75°F). Precipitation is more frequent in September, with 99 mm (3.9 in) over 10 days, compared to June's 72 mm (2.9 in) over 8 days. Humidity remains relatively similar in both months, with September at 75% and June at 78%. For more detailed information about June weather, you can visit Sag Harbor weather in June.
In comparing the weather of July and September, we see some notable differences. July tends to be warmer, with average temperatures around 22°C (72°F) and maximums reaching up to 28°C (82°F), compared to September's average of 20°C (69°F) and maximums of 26°C (79°F). Both months receive similar amounts of precipitation, around 99 mm (3.9 in), over approximately 10 days; however, July has slightly lower humidity at 76% compared to September's 75%. For a more detailed look at July weather in Sag Harbor, you can refer to Sag Harbor weather in July.
In comparing the weather between August and September, September tends to be cooler with an average temperature of 20°C (69°F), compared to August’s warmer average of 23°C (73°F). The minimum temperatures in September drop to 12°C (55°F), significantly lower than August's 17°C (63°F). While both months experience similar amounts of precipitation, with September receiving 99 mm (3.9 in) over 10 days and August slightly more at 103 mm (4.0 in) over 9 days, September has a slightly higher humidity level of 75% compared to August's 76%. For a detailed look at August weather specifics, you can check Sag Harbor weather in August.
September generally offers milder weather with minimum temperatures around 12°C (55°F) and an average of 20°C (69°F), peaking at 26°C (79°F). The month sees around 99 mm (3.9 in) of precipitation over approximately 10 days, while maintaining a consistent humidity of 75%. In contrast, October's weather shifts, featuring cooler minimum temperatures dropping to 5°C (42°F) and an average of 16°C (61°F), with a maximum of 24°C (75°F). This month experiences increased rainfall, accumulating about 160 mm (6.3 in) over 14 days, yet humidity remains unchanged at 75%. For more details on the weather in October, you may want to check Sag Harbor weather in October.
In September, temperatures are relatively mild, with a minimum of 12°C (55°F) and a comfortable average of 20°C (69°F), peaking at 26°C (79°F). The month sees around 99 mm (3.9 in) of precipitation over about 10 days, with humidity levels at 75%. In contrast, November brings a noticeable drop in temperatures, featuring a minimum of -5°C (24°F) and an average of 10°C (50°F), while the maximum reaches just 19°C (67°F). Although precipitation increases slightly to 113 mm (4.4 in) over the same 10 days, humidity rises to 80%. For a more detailed look at the weather conditions, you can refer to Sag Harbor weather in November.
September and December present significantly different weather patterns. In September, temperatures range from a mild 12°C (55°F) at night to a pleasant average of 20°C (69°F), peaking at 26°C (79°F) during the day. The month experiences around 99 mm (3.9 in) of precipitation over approximately 10 days, with humidity levels at 75%. In contrast, December sees a drastic drop in temperature, with nighttime lows plunging to -9°C (16°F) and an average temperature of only 5°C (42°F), while daytime highs reach a maximum of 16°C (61°F). Additionally, December has higher precipitation levels at 147 mm (5.8 in) spread across 12 days, along with increased humidity at 80%. For more detailed insights into December weather, you can check Sag Harbor weather in December.
As summer gives way to autumn, September in Sag Harbor brings a refreshing transition in weather. The temperatures are pleasantly moderate, offering a balance between warmth and coolness, making it an ideal time for outdoor activities. However, increased humidity and occasional rainy days remind us that the season is changing. Unlike the stark heat of July and August, September sets a more inviting atmosphere, with plenty of charming, crisp days that invite visitors to explore the beautiful surroundings. For those interested in learning more about how the climate impacts their visit, check out the detailed insights on Sag Harbor Climate.