September Weather in Seabrook Beach, United States

Last updated: February 24, 2025

September at Seabrook Beach presents a delightful transition towards cooler days, characterized by an average temperature of 18°C (65°F), with peak highs reaching a balmy 30°C (86°F). While the minimum dips to a refreshing 7°C (46°F), this coastal haven experiences moderate humidity levels at 71%, making for pleasant outdoor activities. However, visitors should be prepared for sporadic rainfall, as 78 mm (3.1 in) of precipitation falls over about 8 days throughout the month. Embrace the serene beauty of early fall as Seabrook Beach showcases its unique charm during September!

September Temperature in Seabrook Beach

As September unfolds at Seabrook Beach, the air begins to feel more refreshing, marking a transition towards autumn. Temperatures show a delightful balance, with average highs reaching 30°C (86°F), while the evenings cool down to a comfortable 7°C (46°F). This drop from the summer peaks hints at the changing seasons, yet the warmth still invites beachgoers to soak in the sun. The average temperature settles at a mild 18°C (65°F), making it an ideal time for outdoor activities, whether it’s a leisurely stroll along the shore or a cozy bonfire under the starlit sky. September truly captures the essence of summer’s final glow, setting the stage for the vibrant foliage that follows.

September Weather in Seabrook Beach: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Seabrook Beach, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec303236465565717165554334
Data source: Temperature data for Seabrook Beach generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Seabrook Beach

September in Seabrook Beach sees a transition toward wetter conditions, with precipitation amounts averaging 78 mm (3.1 in) over the month. This slight uptick follows the summer's relatively dry spell, where August recorded only 71 mm (2.8 in). The month typically experiences about 8 days of rain, which aligns with the less frequent but more intense patterns observed in earlier months, such as July and April, which boast higher totals. As the beach community approaches autumn, September's moderate rainfall prepares the landscape for the heavier downpours that characterize the subsequent months, especially October's impressive 142 mm (5.6 in). This shift marks a beautiful balance in the region’s climate, blending the remnants of summer warmth with the impending coolness of autumn.

September Precipitation Trends in Seabrook Beach

The chart displays monthly precipitation patterns in Seabrook Beach, with values for each month alongside September's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec79989414383881237178143108133
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Seabrook Beach

In Seabrook Beach, the month of September brings a notable uptick in humidity, with levels averaging around 71%. This marks a slight increase from the lower summer months, where humidity dipped to its annual low of 66% in August and 67% in July. As the region transitions from the warmth of summer to the cooler autumn months, humidity levels begin to rise again, hinting at the approaching fall season. The humidity typically peaks in the winter months, reflecting the overall pattern of high moisture levels from winter's 86% in January to 84% in November. This shifting trend showcases the dynamic climate of Seabrook Beach, where each season offers its own unique humidity profile.

September Average Humidity in Seabrook Beach

This chart illustrates the average monthly humidity levels in Seabrook Beach, with September's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how September's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%82%80%72%72%67%66%71%79%84%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Seabrook Beach

As September unfolds in Seabrook Beach, the UV Index reflects a noticeable shift, settling at 7—a high level of UV exposure that requires attention. After a summer filled with intense UV activity peaking at 10 in June and remaining at 9 through July and August, the arrival of fall brings a slight reprieve while still necessitating sun protection for extended outdoor activities. With a burn time of approximately 25 minutes, individuals should remain vigilant about their sun exposure during this month. This trend of decreasing UV levels is a welcome transition, yet it's important to note that UV risks remain significant as we bid farewell to summer. For more detailed insights on the UV Index throughout the year, visit Seabrook Beach UV Index.

Maximum UV Index Levels in Seabrook Beach for September

The chart shows the monthly maximum UV Index (UVI) for Seabrook Beach in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec2457910997532
Data source: Seabrook Beach September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

September Sunshine in Seabrook Beach

As summer's warmth begins to wane, September in Seabrook Beach still boasts a commendable 285 hours of sunshine. This month showcases a gradual transition as days shorten, yet it still retains a vibrant glow compared to the earlier months of the year. Following the peak of August with 337 hours, September reflects a natural ebb, featuring plenty of sunny days perfect for enjoying the beach and outdoor activities. The sunshine totals dip noticeably in October, marking a shift toward the cooler, cozier months. This trend highlights how September serves as a bridge between the energetic summer months and the more subdued fall, inviting locals and visitors alike to relish the lingering sunshine before the chill arrives.

Monthly Sunshine Duration in Seabrook Beach: September Highlighted

The September sunshine duration represents the total number of hours Seabrook Beach experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec150h183h256h245h295h330h335h337h285h221h193h176h
Data source: Seabrook Beach September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Seabrook Beach During September

In Seabrook Beach, September brings a 44% chance of sunny weather, marking a slight increase compared to the summer months, particularly July and August where sunlight drops to 32%. This uptick indicates a transition towards more pleasant conditions as the hotter months wane. While not the sunniest month overall—January kicks off the year with 42%—September stands out as a promising end-of-summer option for beachgoers. With its mild weather patterns, visitors can relish in the lingering warmth while enjoying a higher likelihood of sunshine than in the preceding months.

Percentage of Sunny Days in September in Seabrook Beach

The chart illustrates the percentage of sunny days in Seabrook Beach throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Seabrook Beach experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec42%35%61%40%38%40%32%32%44%38%54%32%
Data source: Seabrook Beach September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Seabrook Beach in September

As summer bids farewell, September in Seabrook Beach brings a gentle transition marked by 12 hours of daylight, a noticeable decline from the sun-soaked 15 hours of peak summer in June. The month showcases a gradual tapering of sunlight, a precursor to the shorter, cooler days ahead. While daylight diminishes compared to the vibrant summer months, September still offers ample time for outdoor activities and beach strolls, nestled between the lushness of summer and the crispness of fall. This shift highlights the cyclical nature of the year as the days begin to shorten, paving the way for the cozy ambiance of autumn.

Average Daylight Hours in Seabrook Beach for September

The chart illustrates the variation in daylight duration in Seabrook Beach throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 23m10h 31m11h 57m13h 26m14h 40m15h 18m14h 57m13h 51m12h 26m10h 58m9h 41m9h 2m
Data source: Seabrook Beach daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Seabrook Beach

As summer fades into fall, September brings a gentle breeze to Seabrook Beach, with an average wind speed of 3.9 m/s (9 mph). This moderate wind is a transition from the summer's calmest months, where wind speeds dipped to their lowest in July and August at 3.5 m/s (8 mph) and 3.3 m/s (7 mph), respectively. The arrival of September signals a slight uptick, hinting at the seasonal changes ahead, though still remaining below the early spring gusts that peak around 5.2 m/s (12 mph) in March. This delicate breeze invites beachgoers to savor the lingering warmth of summer while embracing the upcoming cooler months. As October approaches, the average wind speed climbs back to 4.4 m/s (10 mph), perfectly encapsulating the dynamic weather rhythms of the coastal paradise.

Average September Wind Speed in Seabrook Beach

The chart displays monthly wind speed patterns in Seabrook Beach, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.74.75.24.44.24.13.53.33.9 m/s4.44.64.6
Data source: Seabrook Beach September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Seabrook Beach Compares to Other Months

The weather in Seabrook Beach 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 Seabrook Beach and find detailed weather information for every month.

September and January present starkly contrasting weather conditions. In September, temperatures range from a mild 7°C (46°F) to a warm 30°C (86°F), with an average of 18°C (65°F), making it a pleasant month. While precipitation is similar to that of January at 78 mm (3.1 in) over 8 days, the humidity is relatively lower at 71%. In contrast, January features much colder temperatures, with lows plummeting to -19°C (-2°F) and an average of -1°C (30°F). Despite having the same amount of precipitation, January's higher humidity at 86% adds to the chill, creating a much more biting atmosphere. For more detailed information on January weather in this region, you can check Seabrook Beach weather in January.

September and February present strikingly different weather patterns. In September, temperatures range from a mild 7°C (46°F) at night to a warm maximum of 30°C (86°F) during the day, with an average temperature of 18°C (65°F). The month sees moderate precipitation, totaling around 78 mm (3.1 in) over 8 days, and humidity levels around 71%. In contrast, February experiences much colder conditions, with temperatures dipping as low as -16°C (4°F) and peaking at only 17°C (64°F), averaging around 0°C (32°F). The month is also wetter, with 98 mm (3.9 in) of precipitation spread across 11 days and higher humidity at 84%. For those looking to understand February's climate in detail, Seabrook Beach weather in February provides comprehensive insights.

When comparing the weather in September and March, significant differences in temperature and precipitation patterns are evident. September typically boasts a milder climate, with average temperatures ranging from a minimum of 7°C (46°F) to a maximum of 30°C (86°F), making it a warm month for outdoor activities. In contrast, March experiences much cooler conditions, with temperatures dipping as low as -14°C (8°F) and averaging only 2°C (36°F).

While September sees about 78 mm (3.1 inches) of precipitation over 8 days, March is slightly wetter, with 94 mm (3.7 inches) falling over 10 days. Additionally, March has a higher humidity level of 82%, compared to September's 71%. For more specific details on March weather, you can check out Seabrook Beach weather in March.

September and April present contrasting weather patterns, reflecting the transition from summer to fall and winter to spring, respectively. In September, temperatures range from a mild 7°C (46°F) at night to a warm 30°C (86°F) during the day, with an average of 18°C (65°F). The month sees about 78 mm (3.1 in) of precipitation over eight days, with humidity levels around 71%. In contrast, April experiences cooler temperatures, with nighttime lows dipping to -2°C (29°F) and daytime highs reaching 24°C (76°F), averaging 8°C (46°F). It also tends to be wetter, with a total precipitation of 143 mm (5.6 in) over 13 days and slightly higher humidity at 80%. For more detailed information on April weather specifically, check out Seabrook Beach weather in April.

September weather tends to be warmer than May, with average temperatures reaching 18°C (65°F) compared to May's 13°C (55°F). While September can peak at a high of 30°C (86°F), May's maximum rarely exceeds 27°C (82°F). Both months experience similar humidity levels, hovering around 71-72%, and comparable amounts of precipitation, with September having slightly less at 78 mm (3.1 in) over 8 days compared to May’s 83 mm (3.3 in) over 11 days. For more detailed information about May weather, you can check Seabrook Beach weather in May.

Both September and June exhibit similar average temperatures, with averages sitting at 18°C (65°F) and maximums reaching up to 30°C (86°F). However, September experiences slightly cooler minimum temperatures, averaging 7°C (46°F), compared to June's 8°C (47°F). In terms of precipitation, June tends to be a bit wetter, with 88 mm (3.5 in) over 10 days, while September sees 78 mm (3.1 in) across 8 days. Humidity levels are also comparable, with September at 71% and June at 72%. For more detailed information on the weather during this month, check out Seabrook Beach weather in June.

September weather is generally milder compared to July, with minimum temperatures dropping to 7°C (46°F) versus July's minimum of 13°C (56°F). While the average temperature in September reaches 18°C (65°F), July boasts a warmer average of 22°C (71°F) and slightly higher maximums, peaking at 31°C (88°F) compared to September’s 30°C (86°F). Additionally, September experiences more rainfall, with 78 mm (3.1 in) over 8 days, compared to July's higher total of 123 mm (4.8 in) over 12 days, although the humidity remains relatively similar, at 71% for September and 67% for July. For more detailed insights, you can check Seabrook Beach weather in July.

In comparing the weather between August and September, September tends to be cooler, with average temperatures dropping from 22°C (71°F) in August to 18°C (65°F). While August experiences relatively higher minimum and maximum temperatures, ranging from 13°C (55°F) to 31°C (88°F), September provides a wider range, with a minimum of 7°C (46°F) and a maximum of 30°C (86°F). Precipitation levels are slightly higher in September at 78 mm (3.1 in) over 8 days compared to August's 71 mm (2.8 in) over 9 days, along with a marginally increased humidity level in September at 71%. For more detailed insights, you can check Seabrook Beach weather in August.

September generally offers warmer weather with temperatures ranging from a minimum of 7°C (46°F) to a maximum of 30°C (86°F) and an average of 18°C (65°F). In contrast, October sees a noticeable drop, with minimum temperatures falling to 1°C (34°F) and an average of 13°C (56°F). Additionally, October experiences increased precipitation, totaling 142 mm (5.6 in) over 11 days, compared to September's 78 mm (3.1 in) across 8 days. Humidity also rises slightly in October, averaging 78% compared to September's 71%. For more detailed insights, you can check Seabrook Beach weather in October.

September and November exhibit stark contrasts in weather patterns. In September, temperatures range from a mild 7°C (46°F) to a warm 30°C (86°F), with an average of 18°C (65°F), making it a pleasant month. The precipitation is relatively low at 78 mm (3.1 in) over about 8 days, and humidity hovers around 71%. In contrast, November brings a chillier climate, with temperatures dropping to a minimum of -12°C (11°F) and averaging just 6°C (43°F). The month experiences more precipitation, totaling 108 mm (4.3 in) across 11 days, and a higher humidity level of 84%. For a closer look at November's weather specifics, you can check out Seabrook Beach weather in November.

September and December showcase stark contrasts in weather conditions. In September, temperatures range from a mild 7°C (46°F) at night to a warm 30°C (86°F) during the day, accompanied by an average humidity of 71% and 78 mm (3.1 in) of precipitation spread over 8 days. By December, the weather shifts dramatically, with temperatures plummeting to a minimum of -19°C (-1°F) and averaging only 1°C (34°F). This winter month sees increased precipitation at 133 mm (5.2 in) over 10 days and a higher humidity level of 81%. For those interested in specific weather details, check out Seabrook Beach weather in December.

Compare Seabrook Beach's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Seabrook Beach

As September rolls into Seabrook Beach, the weather begins to transition, offering a delightful blend of summer warmth and the refreshing crispness of fall. While daytime temperatures can still reach a comfortable peak, the nights bring a cooler embrace, creating a pleasant contrast from the hot summer days. Expect a moderate level of humidity and occasional rain, with precipitation more common than in the previous months. This shift not only enhances the beach atmosphere but also provides a unique opportunity for visitors to enjoy more serene coastal walks and stunning sunsets. For a deeper dive into what to expect throughout the year, check out the detailed information on Seabrook Beach Climate.