September Weather in Rockport, United States

Last updated: February 24, 2025

September in Rockport, United States, showcases a delightful transition into autumn, with maximum temperatures reaching up to 25°C (77°F) and an average of 18°C (65°F). The month experiences a comfortable low of around 12°C (54°F), creating a pleasant atmosphere for outdoor activities. While precipitation is moderately high at 86 mm (3.4 in) over seven days, humidity levels hover around 71%, adding a refreshing coastal feel to the air. This blend of mild temperatures and occasional rain offers a unique charm, making September an inviting time to explore the beauty of Rockport.

September Temperature in Rockport

In September, Rockport experiences a delightful transition as summer gives way to fall. The temperatures range from a minimum of 12°C (54°F) to a maximum of 25°C (77°F), with an inviting average of 18°C (65°F). This month marks a noticeable shift, showcasing a mild warmth reminiscent of summer, yet the crispness in the mornings hints at the approaching autumn. As the days gradually shorten and cooler breezes begin to flow, September offers residents and visitors alike a perfect blend of warmth and refreshing coolness, making it a splendid time to explore the natural beauty of Rockport.

September Weather in Rockport: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Rockport, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec343437445261686965574638
Data source: Temperature data for Rockport 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 Rockport

In September, Rockport experiences a modest precipitation total of 86 mm (3.4 inches), with rainfall occurring over just 7 days, marking a slight increase from the more arid August. This month typically bridges the gap between the summer's drier spells and the wetter fall season, providing a gentle shift in the weather dynamics. Notably, September's precipitation aligns closely with January and July, showcasing an overall trend of increased moisture as the year transitions towards the cooler months. While still relatively mild, the rainfall in September hints at the heavier downpours to come in October, which averages a striking 161 mm (6.3 inches). This pattern indicates a gradual buildup in precipitation as autumn takes hold, inviting a richer tapestry of seasonal change in the area.

September Precipitation Trends in Rockport

The chart displays monthly precipitation patterns in Rockport, 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.
JanFebMarAprMayJunJulAugSepOctNovDec891091061569283985486161112140
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Rockport

In September, Rockport experiences a noticeable shift in humidity levels, averaging around 71%. This marks a gradual increase from the dry summer months of July and August, which saw their lowest humidity readings at 67% and 66%, respectively. As autumn approaches, humidity begins to climb again, just ahead of the wetter months of October and November, when levels rise significantly to 78% and 84%. This gentle uptick in September reflects a transition, blending the warmth of summer with the cooling tendencies of fall, making it a time of refreshing change in the coastal air.

September Average Humidity in Rockport

This chart illustrates the average monthly humidity levels in Rockport, 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 Rockport

As summer transitions into fall, September in Rockport sees the UV Index dip to a high of 7, indicating a shift from the very high levels experienced in the peak summer months. This month, outdoor enthusiasts can expect a burn time of approximately 25 minutes, offering a more manageable sun exposure compared to the scorching heights of June and July. However, with the UV Index still elevated, it's essential to take precautions when basking in the still-warm sun. As the seasons change, staying informed about UV levels remains crucial for skin safety. For more details, visit Rockport UV Index.

Maximum UV Index Levels in Rockport for September

The chart shows the monthly maximum UV Index (UVI) for Rockport 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.
JanFebMarAprMayJunJulAugSepOctNovDec2457910997632
Data source: Rockport 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 Rockport

September in Rockport unveils a captivating transition, as it basks in 281 hours of sunshine, a beautiful winding down from the summer peak. After a sun-soaked July and August, which boasted 342 and 335 hours respectively, the month begins to usher in the more mellow tones of autumn. While the sun's rays are slightly less intense than in the high summer, this is still a remarkable amount of sunshine compared to earlier in the year, like January's mere 148 hours. This gradual decline hints at a shift in seasons, yet September retains a warmth and vibrancy, allowing residents and visitors alike to savor the lingering joys of summer before the cooler days of October set in, which dips to 229 hours. Each hour of sunshine in September serves as a reminder of the beauty of transition, where summer's farewell dances with autumn's first embrace.

Monthly Sunshine Duration in Rockport: September Highlighted

The September sunshine duration represents the total number of hours Rockport 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.
JanFebMarAprMayJunJulAugSepOctNovDec148h187h256h247h303h333h342h335h281h229h198h173h
Data source: Rockport September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Rockport During September

In Rockport, United States, the likelihood of sunny weather in September stands at 47%, marking a noticeable uptick from the summer months of July and August, which both showed only 34% and 33% chances of sunshine, respectively. As we transition from the sweltering summer heat to the cooler fall ambiance, September presents a more promising forecast, edging closer to the sunnier months of March and November, which boast 60% and 53% chances of sun. This trend highlights September as a fantastic time for outdoor activities, with brighter skies and comfortable temperatures making it an appealing choice for locals and visitors alike.

Percentage of Sunny Days in September in Rockport

The chart illustrates the percentage of sunny days in Rockport 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 Rockport experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec38%32%60%41%40%41%34%33%47%39%53%30%
Data source: Rockport September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Rockport in September

As summer fades into autumn, September in Rockport, United States, showcases a gentle transition in daylight duration. Following the peak of 15 hours in June, the daylight hours gradually decrease, with September offering around 12 hours of sunlight. This creates a harmonious blend of warm days and cooler evenings, reminiscent of the lingering summer while hinting at the upcoming fall. The decline from August's 13 hours serves as a reminder of the seasonal shift, paving the way for the crisp October air and cozy nights that follow, as daylight wanes further to 10 hours. The rhythm of daylight in Rockport highlights the beauty of change, inviting residents and visitors alike to embrace the unique charm of each season.

Average Daylight Hours in Rockport for September

The chart illustrates the variation in daylight duration in Rockport throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 26m10h 33m11h 57m13h 24m14h 38m15h 14m14h 55m13h 49m12h 26m10h 59m9h 44m9h 5m
Data source: Rockport daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Rockport

As summer wanes and September arrives in Rockport, the winds begin to shift, heralding the transition into fall. With an average wind speed of 5.7 m/s (13 mph), September experiences a notable increase from the languid summer breezes, reflecting a natural uptick from August’s gentle 4.7 m/s (10 mph). Following the annual dip in wind speed during the peak summer months of July and August, September stands out as a time when breezes regain their vigor yet remain mild compared to the autumn months ahead. This gradual rise not only signals a refreshing change in the atmosphere but also sets the stage for the more robust winds of October and November, which often invigorate both the landscape and local activities.

Average September Wind Speed in Rockport

The chart displays monthly wind speed patterns in Rockport, 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.
JanFebMarAprMayJunJulAugSepOctNovDec7.27.17.56.26.05.95.04.75.7 m/s6.56.87.0
Data source: Rockport September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Rockport Compares to Other Months

The weather in Rockport 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 Rockport and find detailed weather information for every month.

In September, temperatures range from a minimum of 12°C (54°F) to a maximum of 25°C (77°F), creating a comfortable average of 18°C (65°F). The month experiences a moderate level of precipitation at 86 mm (3.4 in) across about 7 rainy days, with a humidity level of 71%. In contrast, January brings much colder conditions, with temperatures plunging to a minimum of -16°C (4°F) and an average of just 1°C (34°F), peaking at 14°C (58°F). January's precipitation is slightly higher at 89 mm (3.5 in) over 9 days, accompanied by increased humidity at 86%. For more details about January weather in Rockport, check out this link: Rockport weather in January.

September and February present starkly contrasting weather conditions. In September, temperatures typically range from a mild 12°C (54°F) to a pleasant maximum of 25°C (77°F), with an average of around 18°C (65°F). This month experiences about 86 mm (3.4 in) of precipitation and humidity levels around 71%, making it relatively comfortable and inviting for outdoor activities. In contrast, February brings much colder weather, with temperatures dipping as low as -13°C (9°F) and averaging only 1°C (35°F), peaking at 11°C (53°F). This winter month is rainier, accumulating about 109 mm (4.3 in) of precipitation over approximately 11 days, and higher humidity levels at 84%, contributing to a chilly atmosphere. For a deeper dive into February’s conditions, check out Rockport weather in February.

In comparing the weather between September and March, notable differences can be observed. September features milder temperatures with a minimum of 12°C (54°F) and an average of 18°C (65°F), reaching a maximum of 25°C (77°F). The month receives around 86 mm (3.4 in) of precipitation over about 7 days, with humidity levels at 71%. In contrast, March is much colder, with temperatures ranging from a minimum of -11°C (12°F) to an average of 3°C (37°F) and a maximum of 13°C (56°F). March also has higher precipitation of 106 mm (4.2 in) spread over 10 days and slightly increased humidity at 82%. For a more detailed look at March weather, you can visit Rockport weather in March.

When comparing the weather in September and April, it's evident that September boasts milder temperatures with a minimum of 12°C (54°F) and maximum of 25°C (77°F), averaging around 18°C (65°F). In contrast, April experiences cooler temperatures, ranging from a minimum of -1°C (31°F) to a maximum of 17°C (63°F), with an average temperature of only 7°C (44°F). Additionally, April sees more precipitation, accumulating 156 mm (6.1 in) over 13 days, compared to September's 86 mm (3.4 in) over just 7 days. The humidity is also higher in April at 80%, compared to September's 71%. For a closer look at April's weather in Rockport, you can visit Rockport weather in April.

When comparing the weather in September and May, September generally offers warmer temperatures, with averages ranging from a minimum of 12°C (54°F) to a maximum of 25°C (77°F), while May's temperatures are cooler, peaking at 20°C (69°F) with a minimum of just 3°C (39°F). Both months see similar levels of precipitation, with September receiving 86 mm (3.4 in) over 7 days and May slightly higher at 92 mm (3.6 in) over 10 days. Humidity levels are quite comparable as well, with September at 71% and May at 72%. For a detailed look at climate specifics, you can check out Rockport weather in May.

In comparing the weather of September and June, September generally boasts warmer temperatures, with a minimum of 12°C (54°F) and an average of 18°C (65°F), while June has slightly cooler readings, with a minimum of 9°C (49°F) and an average of 16°C (61°F). The maximum temperatures are also higher in September, reaching 25°C (77°F) compared to June's maximum of 23°C (73°F). Both months experience similar amounts of precipitation, with September at 86 mm (3.4 in) across 7 days and June slightly less at 83 mm (3.3 in) over 9 days. Humidity levels are comparable, with September at 71% and June at 72%. For a closer look at June's weather specifics, visit Rockport weather in June.

In comparing the weather between July and September, we observe that July tends to be slightly warmer, with average temperatures reaching around 20°C (68°F) and a maximum of 27°C (81°F), whereas September has a cooler average of 18°C (65°F) and a maximum of 25°C (77°F). Humidity levels are fairly similar, with September at 71% and July at 67%. However, September experiences a bit more precipitation, totaling 86 mm (3.4 in) over 7 days compared to July's 97 mm (3.8 in) over 10 days. For a more detailed exploration of July's climate, check out Rockport weather in July.

In comparing the weather patterns of September and August, September tends to be slightly cooler, with average temperatures ranging from a minimum of 12°C (54°F) to a maximum of 25°C (77°F), compared to August's warmer range of 16°C (61°F) to 27°C (81°F). Additionally, September receives more precipitation, totaling 86 mm (3.4 in) over about 7 days, while August records only 54 mm (2.1 in) during the same number of days. Humidity also rises in September, averaging 71%, compared to August's 66%. For more detailed insights, you can check out Rockport weather in August.

September weather showcases milder temperatures, with averages ranging from a minimum of 12°C (54°F) to a maximum of 25°C (77°F), along with 86 mm (3.4 in) of precipitation over about 7 days. In contrast, October experiences a significant drop in temperatures, averaging between 3°C (38°F) and 21°C (69°F), while also seeing a notable increase in precipitation to 161 mm (6.3 in) over 13 days. Additionally, October is slightly more humid, with humidity levels reaching 78%. For more detailed information about October conditions, you can visit Rockport weather in October.

September presents a mild and pleasant climate, with average temperatures around 18°C (65°F) and a maximum of 25°C (77°F). In contrast, November experiences significantly cooler temperatures, averaging just 8°C (46°F), with a minimum dip to -9°C (16°F). While September enjoys relatively lower precipitation of 86 mm over 7 days, November sees an increase in rainfall, totaling 112 mm over 11 days, accompanied by higher humidity at 84%. For those curious about specific conditions, more details can be found here: Rockport weather in November.

September and December present stark contrasts in weather. In September, temperatures range from a mild 12°C (54°F) at night to a comfortable 25°C (77°F) during the day, with an average of 18°C (65°F). The humidity sits at 71%, and the month experiences about 86 mm (3.4 in) of precipitation over approximately 7 days. In contrast, December brings much colder conditions, with temperatures dipping as low as -14°C (7°F) and averaging only 3°C (38°F). The maximum temperature reaches just 14°C (58°F), and humidity increases to 81%. This month experiences more precipitation, totaling 140 mm (5.5 in) over about 10 days. For those interested in specific conditions, you can find additional details at Rockport weather in December.

Compare Rockport's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Rockport

September in Rockport heralds a shift towards milder temperatures, making it a delightful month as summer wanes. The warmth of the day still lingers with an average high of 25°C, but the evenings start to bring a refreshing coolness that gently hints at the upcoming fall. Compared to the sweltering heat of July and August, September offers a welcome respite, while also seeing a rise in humidity levels. Despite the 86 mm of precipitation over about seven days, this month tends to feature more pleasant, sunny intervals. For those seeking more insights, check out the full details at Rockport Climate.