Last updated: February 24, 2025
September in Boothbay Harbor, United States, showcases a delightful transition into autumn, characterized by a maximum temperature of 23°C (74°F) and an average of 17°C (62°F). As the days grow cooler, temperatures dip to a pleasant minimum of 9°C (48°F). This month typically experiences 81 mm (3.2 in) of precipitation over approximately 8 days, contributing to a humidity level of 80% that envelops the region in a refreshing coastal atmosphere. Visitors can expect a mix of mild, sunny days and occasional rain, making it an ideal time to enjoy the stunning natural beauty and vibrant local culture of Boothbay Harbor.
In September, Boothbay Harbor begins to shed the warmth of summer, ushering in a delightful transition into autumn. The temperatures show a noticeable dip, with minimums averaging around 9°C (48°F) and maximums reaching up to 23°C (74°F). This month maintains a comfortable average of 17°C (62°F), making it a pleasant time for outdoor activities amid beautiful fall foliage. Compared to the height of summer, September's temperatures create a refreshing atmosphere, perfect for enjoying scenic coastal views and embracing the early signs of the changing season.
In September, Boothbay Harbor experiences a moderate precipitation total of 81 mm (3.2 in) over the month, typically spread across 8 days. This marks a slight decrease compared to the wetter months of April and October, highlighting a gradual shift towards drier conditions as summer transitions into fall. The rainfall in September remains consistent with the preceding months of July and August, which also saw similar precipitation amounts of 100 mm and 71 mm respectively. As the year progresses, the trend indicates increasing precipitation once again in October, suggesting that autumn brings with it a greater likelihood of rain as the region prepares for the winter months ahead.
In September, Boothbay Harbor experiences a humidity level of 80%, which reflects a slight decrease from the more humid summer months. As the summer progresses into fall, humidity levels generally tend to moderate; August's average of 83% and July's 85% give way to the more comfortable September atmosphere. This month’s humidity aligns closely with the levels seen in November, indicating a gradual transition toward dryer conditions as the year approaches winter. Notably, the highest humidity levels appear in the winter months, peaking in the early part of the year, while the late summer and early fall maintain a more balanced humidity, making September a pleasant interlude in Boothbay Harbor's climate.
In September, Boothbay Harbor experiences a UV Index of 7, placing it in the high exposure category with a burn time of 25 minutes for fair-skinned individuals. This marks a slight decline from the peak summer months of July and August, where the UV Index reached 9 and 8 respectively, maintaining a very high exposure classification. As the days shorten and temperatures cool, the UV Index in September indicates the transition towards a milder fall season, yet sunlight can still be potent, reminding residents and visitors alike to stay vigilant with sun protection. For more detailed insights, explore the Boothbay Harbor UV Index.
UV Risk Categories
As summer fades into the gentle embrace of autumn, September in Boothbay Harbor offers a splendid balance of warmth and light. With 287 hours of sunshine, the month continues the trend of high sunlight typical of the summer months, though it gracefully tapers from the peak of 341 hours in August. This transition marks a delightful shift, providing ample opportunity for outdoor activities while savoring the remnants of summer's glow. Interestingly, September's hours of sunshine remain robust compared to the winter months, such as January with only 145 hours. As the season shifts, Boothbay Harbor invites both locals and visitors to relish in the golden hues of early autumn before the days grow shorter.
As September rolls into Boothbay Harbor, the likelihood of sunny weather sees a moderate uptick, with a 44% chance of sunshine. This trend marks a slight improvement compared to the summer months, where July and August experience lower probabilities of clear skies at 29% and 33%, respectively. Interestingly, September outshines several months earlier in the year, such as January and February, which see chances plummeting to 39% and 34%. The transition into fall appears to breathe a bit of optimism into the weather, making it a favorable time for outdoor enthusiasts to embrace the lingering warmth before winter settles in. As the month progresses, Boothbay Harbor residents and visitors alike can look forward to an inviting blend of sun-kissed days amidst the changing foliage.
As September arrives in Boothbay Harbor, the gradual shifting of daylight becomes evident, marking a transition into fall. With 12 hours of daylight, September sees a slight decrease from the summer months, where the sun bathed the region in 15 hours during June and July. While the daylight begins to wane compared to August's 13 hours, the lingering warmth and brightness of early fall still create a pleasant atmosphere. This month acts as a bridge, as it links the long, sun-filled days of summer with the shorter, cooler days of October, which further drop to 10 hours. The rhythm of daylight not only reflects the passage of seasons but also invites residents and visitors alike to savor the beauty of this coastal retreat before the deepening shadows of autumn set in.
As summer fades into fall, September in Boothbay Harbor reveals a subtly invigorating shift in wind patterns. While the warm breezes of July and August see an average speed of just 4.5 m/s and 4.3 m/s, respectively, September experiences a slight uptick to 5.2 m/s (12 mph). This marks a return to more brisk conditions as autumn approaches, hinting at the increasing energy of the winds that will characterize the coming months. With average speeds climbing again in October to 5.5 m/s, the transition period denotes a refreshing change, inviting both locals and visitors to embrace the vibrant coastal beauty as nature gears up for the cooler days ahead.
The weather in Boothbay 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 Boothbay Harbor and find detailed weather information for every month.
September and January present remarkably contrasting weather conditions. In September, temperatures range from a cool 9°C (48°F) at night to a mild 23°C (74°F) during the day, making it a comfortable month with an average temperature of 17°C (62°F). The month experiences about 81 mm (3.2 in) of precipitation over approximately 8 days, accompanied by a humidity level of 80%. In stark contrast, January plunges into the depths of winter, with temperatures dipping as low as -17°C (2°F) at night and reaching a maximum of 11°C (52°F), averaging -1°C (31°F). Precipitation increases slightly to 96 mm (3.8 in) across about 9 days, while humidity rises to 85%. For more insights into January weather, check out Boothbay Harbor weather in January.
September and February present stark contrasts in weather conditions. In September, temperatures range from a mild minimum of 9°C (48°F) to a maximum of 23°C (74°F), averaging around 17°C (62°F). Precipitation is moderate at 81 mm (3.2 in) over 8 days, with humidity at 80%. Conversely, February brings much colder temperatures, with a minimum of -14°C (7°F) and a maximum of 11°C (53°F), averaging 0°C (31°F). The month sees slightly higher precipitation at 98 mm (3.8 in) over 10 days and a higher humidity level of 86%. For more insights, you can explore Boothbay Harbor weather in February.
September and March present starkly contrasting weather patterns. In September, temperatures range from a mild 9°C (48°F) at night to a pleasant 23°C (74°F) during the day, accompanied by an average humidity of 80%. This month sees approximately 81 mm (3.2 in) of rain over about 8 days. In contrast, March is notably colder, with temperatures dipping as low as -13°C (9°F) and peaking at just 12°C (53°F). Despite a similar precipitation level of 85 mm (3.3 in) over 9 days, the higher humidity of 84% in March adds to the crisp, chilliness of early spring. For a deeper look into weather conditions during this month, you can check out Boothbay Harbor weather in March.
In comparing the weather of September and April, a distinct contrast emerges. September enjoys milder temperatures, with a minimum of 9°C (48°F), an average of 17°C (62°F), and a maximum of 23°C (74°F), making it feel pleasantly warm. In contrast, April sees much cooler conditions, starting with a minimum of -2°C (29°F) and peaking at a maximum of 15°C (60°F), which results in an average temperature of only 6°C (43°F). Additionally, April experiences significantly more precipitation, totaling 139 mm (5.5 in) over about 13 days, compared to September’s 81 mm (3.2 in) over 8 days. Despite these differences, both months maintain relatively high humidity, hovering around 80% in September and slightly lower at 79% in April. For more specific details about April weather in Boothbay Harbor, you can visit Boothbay Harbor weather in April.
In September, temperatures tend to be milder, with minimums around 9°C (48°F) and maximums reaching 23°C (74°F), while May experiences cooler weather with lows of 2°C (37°F) and highs of just 19°C (66°F). Both months see similar precipitation levels, with September receiving 81 mm (3.2 in) over 8 days and May slightly higher at 82 mm (3.2 in) over 10 days. Humidity levels are comparable, with September at 80% and May at 79%, making September generally feel a bit warmer and more comfortable than May's brisk climate. For more details on May weather, visit Boothbay Harbor weather in May.
Comparing the weather in September and June reveals some interesting differences. In September, temperatures range from a minimum of 9°C (48°F) to a maximum of 23°C (74°F), with an average of 17°C (62°F). In contrast, June features similar minimum temperatures at 9°C (49°F), but has a slightly lower average of 15°C (59°F) and a maximum of 21°C (71°F). Precipitation levels are also noteworthy; September sees 81 mm (3.2 in) of rain over 8 days, while June has 71 mm (2.8 in) of precipitation across the same number of days. Both months experience high humidity, with September at 80% and June at 86%. For more details about June weather, you can visit Boothbay Harbor weather in June.
When comparing the weather in September and July, we notice some significant differences. September tends to be cooler, with temperatures ranging from a minimum of 9°C (48°F) to a maximum of 23°C (74°F), whereas July is warmer, with temperatures ranging from a minimum of 13°C (56°F) to a high of 25°C (78°F). Precipitation is slightly less in September, with 81 mm (3.2 in) falling over about 8 days, compared to July's 100 mm (3.9 in) over 10 days. Additionally, September has a slightly lower humidity level of 80%, compared to July's 85%. For more detailed information on July weather, you can check Boothbay Harbor weather in July.
In comparing the weather between August and September, we see a distinct transition from the warmth of late summer to the cooler beginnings of fall. August typically boasts milder temperatures, with a minimum of 15°C (59°F) and an average of 20°C (67°F), compared to September's cooler minimum of 9°C (48°F) and an average of 17°C (62°F). The maximum temperatures also show a decline, with August reaching up to 25°C (78°F) while September peaks at 23°C (74°F). Both months experience about 8 days of precipitation, though September has slightly higher rainfall, totaling 81 mm (3.2 in) versus August’s 71 mm (2.8 in). Furthermore, humidity levels remain fairly consistent, with September at 80% and August at 83%. For a more detailed look at August weather, visit Boothbay Harbor weather in August.
September and October show a distinct shift in weather patterns. In September, temperatures range from a mild minimum of 9°C (48°F) to a comfortable maximum of 23°C (74°F) with an average of 17°C (62°F). This month experiences 81 mm (3.2 in) of precipitation over approximately 8 days, along with a humidity level of 80%. In contrast, October brings cooler temperatures with a minimum of 2°C (36°F) and a maximum of 19°C (67°F), settling at an average of 12°C (55°F). The month is considerably wetter, recording 150 mm (5.9 in) of precipitation over 12 days, while humidity decreases slightly to 77%. For more detailed information, you can visit Boothbay Harbor weather in October.
September and November exhibit distinct weather patterns, reflecting the transition from late summer to late autumn. In September, the temperatures range from a pleasant minimum of 9°C (48°F) to a maximum of 23°C (74°F), with an average of 17°C (62°F). The month sees moderate precipitation of 81 mm (3.2 in) spread over about 8 days, accompanied by high humidity levels of 80%. In contrast, November experiences much colder temperatures, with a minimum dipping to -10°C (14°F) and an average of just 6°C (44°F). Although the maximum temperature reaches 17°C (63°F), it is typically accompanied by increased rainfall, totaling 122 mm (4.8 in) over approximately 11 days, while still maintaining an 80% humidity. For more details on November weather in Boothbay Harbor, you can visit Boothbay Harbor weather in November.
September and December showcase stark contrasts in weather patterns. September tends to be milder, with temperatures ranging from a minimum of 9°C (48°F) to a maximum of 23°C (74°F), and an average of 17°C (62°F). It experiences moderate precipitation, totaling 81 mm (3.2 in) over 8 days, all accompanied by high humidity at 80%. In contrast, December ushers in the chill of winter, with temperatures plummeting to a minimum of -16°C (3°F) and an average of just 1°C (35°F). Despite the cold, December sees increased precipitation, totaling 137 mm (5.4 in) over 11 days, while maintaining a similar humidity level of 81%. For more specific details on winter weather in this region, you can visit Boothbay Harbor weather in December.
As summer transitions to fall, September in Boothbay Harbor features a delightful mix of mild temperatures and increased humidity, setting it apart from the hotter months. The warmth lingers, with average highs still around a comfortable 17°C, but the cooler evenings remind us of the changing season. While rainfall totals average 81 mm over roughly eight days, this precipitation tends to be more intermittent, allowing for plenty of opportunities to enjoy the stunning coastal scenery. To delve deeper into the nuanced climate of this charming town, check out Boothbay Harbor Climate.