Last updated: February 24, 2025
In Yarmouth, United States, September showcases a delightful transition into autumn, with temperatures peaking at 25°C (78°F) and averaging around 19°C (67°F), while nighttime lows dip to a cozy 13°C (56°F). The month experiences 118 mm (4.7 in) of precipitation spread over 10 days, contributing to a 75% humidity level that enhances the crisp air. Visitors and residents alike can enjoy the lingering warmth of late summer, accompanied by refreshing rainfall that nurtures the vibrant nature of this charming coastal town.
In September, Yarmouth experiences a delightful transition as summer waves goodbye and autumn creeps in. The temperatures reflect this shift, with minimums averaging around 13°C (56°F) and daytime highs peaking at a pleasant 25°C (78°F). The average temperature settles at a comfortable 19°C (67°F), making this month ideal for outdoor activities and enjoying the scenic beauty of the changing foliage. As the month progresses, the lingering warmth of summer gradually gives way to cooler evenings, hinting at the chillier days that lie ahead in October. Overall, September serves as a perfect bridge between the vibrant warmth of summer and the crispness of fall.
In September, Yarmouth experiences a notable increase in precipitation, with a total of 118 mm (4.7 in), aligning closely with the trend observed in the spring months. This uptick in rainfall typically accompanies the transition to autumn, where cooler temperatures invite more moisture. Interestingly, September sees 10 days of rain, mirroring the consistency found in early winter months like January and February. As summer's dryness gives way to this wetter pattern, it's apparent that Yarmouth's climate shifts gears, setting the stage for the more substantial precipitation that follows in October, which averages 175 mm (6.9 in). Overall, September serves as a pivotal bridge, subtly hinting at the wetter months ahead while still retaining some of summer’s residual warmth.
In September, Yarmouth experiences a pleasant humidity level of 75%, marking a subtle transition into the fall season. This figure aligns closely with the previous months of July and August, both at 76%, indicating a gradual decline as summer gives way to cooler air. Overall, the humidity in Yarmouth shows a trend of decreasing levels from the earlier months of the year, starting at a peak of 84% in January and February and steadily dropping to around 75% in September and October. This consistent decline reflects Yarmouth's shift from the humid summers to the drier conditions typically associated with autumn, creating a comfortable atmosphere for outdoor activities.
As the summer fades into fall, September in Yarmouth sees a UV Index of 8, indicating a very high exposure category. This trend marks a slight decline from the intense levels of June and July, which reached an impressive peak of 10. However, with a burn time remaining at just 15 minutes, it's crucial to stay vigilant about sun protection this month. The UV Index retreated from the scorching heights of late summer, yet still poses significant risks for unprotected skin. As we transition into October, the UV levels will continue to drop, signifying a shift toward more moderate exposure categories. For detailed insights on Yarmouth's UV Index throughout the year, check here: Yarmouth UV Index.
UV Risk Categories
As September unfolds in Yarmouth, the days still bathe in a generous 280 hours of sunshine, marking a graceful transition from the summer's peak brightness. This month, while noticeably less luminous than the sun-soaked highs of July and August, continues to reflect a robust overall trend of increasing sunshine hours, peaking in the summer and gradually tapering off into the colder months. The warm glow of early fall embraces the community, hinting at the vibrant colors of autumn while still allowing for lasting moments of enjoyment outdoors. Following a summer filled with abundant sunshine, September gracefully balances warmth and a subtle hint of the cooler days ahead, making it a lovely time to savor the lingering summer vibes before the golden hues of October take over.
As September rolls into Yarmouth, the likelihood of enjoying sunny weather increases, with a 49% chance of sunshine gracing the skies. This marks a notable uptick compared to the summer months like July and August, which hover around the 35% to 37% range. The trend shows that as the seasons transition from the heat of summer to the cooler fall, sunshine probabilities fluctuate, peaking in September before tapering off into October, which offers a 44% chance of sun. This makes September an ideal time for outdoor activities, as the area experiences a delightful blend of moderate temperatures and a promising number of sunny days.
As summer wanes in Yarmouth, September welcomes a shift in daylight duration, offering around 12 hours of sunlight each day. This marks a gradual transition from the height of summer, where long days peaked at 15 hours in June and remained generous at 14 hours in July. By August, daylight begins to recede, settling into a more moderate rhythm. After September, as autumn sets in, daylight continues to decrease, foreshadowing the shorter days of October and November, which dip back to 11 hours and then 9 hours respectively. This natural ebb and flow of sunlight encapsulates the unmistakable rhythm of the changing seasons, inviting Yarmouth's residents to embrace the beauty of shorter, crisper days.
As September arrives in Yarmouth, the winds begin to pick up slightly, averaging 5.9 m/s (13 mph)—a refreshing change from the calmer breezes of August. This month marks a transition, as wind speeds trend upward after a summer low, hinting at the approaching cooler months. The gradual increase from August's 4.8 m/s (11 mph) to September's breezier conditions reintroduces a sense of vigor to the coastal air, inviting residents and visitors alike to enjoy the invigorating weather. As autumn nears, September’s winds echo the transition, bridging the serene warmth of summer with the crispness that follows in October. The dynamic interplay of these winds not only defines the local climate but also enriches the experience of Yarmouth's stunning coastal landscape.
The weather in Yarmouth 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 Yarmouth and find detailed weather information for every month.
September and January present a stark contrast in weather conditions. September typically enjoys milder temperatures, with averages around 19°C (67°F) and highs reaching 25°C (78°F), while January faces much colder weather, where average temperatures drop to just 2°C (36°F) and can plummet to -14°C (6°F). Precipitation in September is higher, with 118 mm (4.7 in) over about 10 days, compared to January’s 94 mm (3.7 in) during the same number of days, though January's humidity is slightly higher at 84%. For a detailed look at weather specifics, check out Yarmouth weather in January.
September and February present strikingly different weather patterns. In September, temperatures range from a mild minimum of 13°C (56°F) to a pleasant maximum of 25°C (78°F), creating an average of 19°C (67°F). While it experiences 118 mm (4.7 in) of rainfall over approximately 10 days, the humidity is also relatively high at 75%. In contrast, February is characterized by much colder conditions, with temperatures dipping as low as -12°C (10°F) and peaking at just 11°C (53°F), yielding an average of 2°C (36°F). Despite slightly higher precipitation at 123 mm (4.8 in) spread over 12 days, February has a higher humidity level of 84%, contributing to a distinctly chillier atmosphere. For more detailed insights on February weather, you can check Yarmouth weather in February.
September and March offer distinctly different weather experiences. In September, temperatures range from a pleasant minimum of 13°C (56°F) to a comfortable maximum of 25°C (78°F), with an average of 19°C (67°F). The month enjoys relatively moderate humidity at 75% and brings about 118 mm (4.7 in) of precipitation over 10 days. In contrast, March is characterized by much colder temperatures, with a minimum of -9°C (16°F) and a max reaching only 13°C (56°F), averaging only 3°C (38°F). The humidity is slightly higher at 82%, and similar to September, it records 118 mm (4.7 in) of precipitation across 10 days. For more details on the specific weather conditions, you can check Yarmouth weather in March.
In comparing the weather of September and April, it's evident that September enjoys milder temperatures with averages around 19°C (67°F), while April is considerably cooler, averaging only about 7°C (46°F). September tends to be drier, with 118 mm (4.7 in) of precipitation over 10 days, in contrast to April's slightly higher precipitation level of 137 mm (5.4 in) spread over 13 days. Additionally, humidity levels are fairly comparable, with September at 75% and April at 79%. For more detailed insights on April's climate, you can refer to Yarmouth weather in April.
In comparing the weather between September and May, we see notable differences in temperature and precipitation patterns. September enjoys warmer averages, with temperatures ranging from a minimum of 13°C (56°F) to a maximum of 25°C (78°F), while May is cooler, with temperatures ranging from 5°C (41°F) to 21°C (70°F). Both months experience a similar amount of precipitation, with September recording 118 mm (4.7 in) over 10 days, and May having slightly higher precipitation at 119 mm (4.7 in) over 12 days. Additionally, humidity remains constant at 75% for both months, suggesting that while May may be cooler and a bit wetter, the overall humidity levels contribute to a consistent feeling of moisture in the air. For more detailed insights, you can explore Yarmouth weather in May.
In comparing the weather of September and June, September tends to be slightly warmer, with average temperatures reaching around 19°C (67°F) compared to June's 17°C (63°F). While both months experience similar precipitation frequency, September receives more rainfall at 118 mm (4.7 in) compared to June's 91 mm (3.6 in). Additionally, September's humidity sits at 75%, slightly lower than June's 78%, which may make September feel a bit more comfortable, despite the increased precipitation. For more details on June weather, you can check out Yarmouth weather in June.
When comparing the weather in September to that in July, some notable differences emerge. In September, temperatures range from a minimum of 13°C (56°F) to a maximum of 25°C (78°F), with an average of 19°C (67°F). This month also sees a higher amount of precipitation, averaging 118 mm (4.7 in) over about 10 days. In contrast, July boasts warmer temperatures, with a minimum of 16°C (61°F) and a maximum of 29°C (84°F), accompanied by slightly less precipitation at 83 mm (3.3 in) over 9 days. Humidity levels are quite similar, with September at 75% and July at 76%. For more detailed information, you can explore Yarmouth weather in July.
September weather shows a notable transition from August, with average temperatures dropping from 22°C (72°F) in August to 19°C (67°F) in September. The maximum temperature also sees a decrease from 27°C (81°F) to 25°C (78°F). Additionally, September experiences more precipitation, totaling 118 mm (4.7 in) over 10 days, compared to August’s 82 mm (3.2 in) over 8 days. Humidity levels remain similar, with September at 75% and August slightly higher at 76%. For a detailed look at August’s weather, you can visit Yarmouth weather in August.
September and October show notable differences in weather patterns. September typically experiences warmer temperatures, with an average of 19°C (67°F) and a maximum of 25°C (78°F), while October cools down considerably, averaging only 15°C (59°F) and reaching a maximum of 22°C (72°F). Precipitation also increases in October, with 175 mm (6.9 in) recorded over 12 days, compared to September's 118 mm (4.7 in) over 10 days. Despite this, humidity levels remain constant at 75% in both months. For more detailed insights, check out Yarmouth weather in October.
September and November weather present a stark contrast as summer transitions to winter. In September, temperatures typically range from a mild 13°C (56°F) at night to a warm 25°C (78°F) during the day, while humidity averages at 75%, creating Pleasant late-summer conditions. In contrast, November brings cooler temperatures, with a minimum of -6°C (21°F) and an average of 9°C (48°F), making it feel much chillier. Precipitation is slightly lower in November at 102 mm (4.0 in) compared to September's 118 mm (4.7 in), but both months see rain on about 10 days. For a closer look at what to expect during this month, check out Yarmouth weather in November.
September and December showcase a stark contrast in weather patterns. In September, the temperatures range from a mild 13°C (56°F) to a warm 25°C (78°F), with an average of 19°C (67°F). The month experiences 118 mm (4.7 in) of precipitation over about 10 days, accompanied by a humidity level of 75%. In contrast, December brings much colder temperatures, with a minimum of -12°C (11°F) and a maximum of 15°C (60°F), leading to an average of just 4°C (40°F). Precipitation increases slightly to 136 mm (5.4 in) over 12 days, and the humidity rises to 80%. For those interested in more detailed insights, you can refer to Yarmouth weather in December.
As September unfolds in Yarmouth, it brings a delightful transition from the warm summer months to the cooler fall season. With average temperatures settling around a comfortable 19°C, this month is marked by a notable drop in daytime heat compared to the peak summer months, while still allowing for pleasant afternoons. However, September also tends to be more humid, contributing to a slightly sticky feel on occasion, with around ten days of precipitation adding to the month’s character. This blend of warmth and moisture sets September apart, making it a unique time to experience the evolving beauty of Yarmouth before the chill of autumn fully sets in. For a deeper dive into what to expect throughout the year, check out the detailed Yarmouth Climate.