September Weather in Freeport, United States

Last updated: February 24, 2025

In September, Freeport, United States, experiences a delightful transition into autumn, characterized by an average temperature of 17°C (63°F), with maximums reaching up to 25°C (77°F) and minimums dipping to 9°C (48°F). This month brings a modest precipitation total of 81 mm (3.2 in) over approximately 8 days, contributing to a humidity level of 71% that makes the air feel pleasantly crisp. As the days grow shorter, the blend of warm days and cool nights creates a refreshing climate ideal for outdoor activities and enjoying the changing scenery.

September Temperature in Freeport

As summer winds down in Freeport, September ushers in a noticeable shift in temperatures, providing a gentle transition into autumn. The month boasts a minimum temperature of 9°C (48°F), an average of 17°C (63°F), and a maximum of 25°C (77°F), making it a delightful time for outdoor activities. These figures reflect a slight cooling trend from the warm, peak summer months of July and August, where temperatures lingered in the mid-teens to high twenties. The crispness in the air often invigorates leisurely strolls and outdoor gatherings, as nature begins to don its fall wardrobe. Overall, September presents a balanced climate that invites both the warmth of lingering summer days and the refreshing hint of autumn's approach.

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

The chart illustrates September temperature patterns in Freeport, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec293034435160676863544334
Data source: Temperature data for Freeport 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 Freeport

In September, Freeport experiences a modest precipitation total of 81 mm (3.2 in) over 8 days, marking a slight uptick from the drier summer months of June and August, which recorded only 77 mm (3.0 in) and 73 mm (2.9 in), respectively. As the year transitions into the fall season, precipitation begins to rise, hinting at the impending wetter months ahead. Notably, this increase is part of an upward trend, as October and November consistently showcase higher precipitation levels, with totals of 170 mm (6.7 in) and 134 mm (5.3 in). This pattern reflects a gradual reawakening of the region's hydrological cycle, paving the way for the nourishing rains that replenish local ecosystems before winter sets in.

September Precipitation Trends in Freeport

The chart displays monthly precipitation patterns in Freeport, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1011059215495771127381170134149
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Freeport

In September, Freeport experiences a humidity level of 71%, a slight uptick from the previous months, signaling the tail end of the summer season. This modest rise from the lower summer months of 66% in August and 67% in July suggests a transition towards the more humid conditions typical of autumn. Notably, humidity levels in Freeport peak during the winter, reaching as high as 86% in January, reflecting a consistent pattern where cooler months bring increased moisture. Overall, September’s humidity indicates a preparatory shift, setting the stage for the autumn months that follow.

September Average Humidity in Freeport

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

As September rolls into Freeport, the UV Index settles at 7, indicating a high exposure category with a burn time of approximately 25 minutes. This marks a gradual decline from the peak summer months of June and July, where UV levels reached a maximum of 10. The trends suggest that while the summer sun wanes, September still demands caution, as the UV Index remains elevated compared to the earlier part of the year. As we transition into fall, it's essential to stay vigilant and protect your skin during outdoor activities. For more detailed insights on UV exposure throughout the year, visit Freeport UV Index.

Maximum UV Index Levels in Freeport for September

The chart shows the monthly maximum UV Index (UVI) for Freeport 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.
JanFebMarAprMayJunJulAugSepOctNovDec2457910987532
Data source: Freeport 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 Freeport

As summer gracefully transitions to autumn, September in Freeport, United States, shines brightly with an impressive 288 hours of sunlight, marking a notable drop from the peak summer months. This trend showcases a clear pattern: the year begins with fewer hours of sunshine, gradually increasing to a summer crescendo in July and August. Following this warm peak, sunlight begins to wane, yet September still offers a generous serving of sunshine that lingers pleasantly, inviting residents and visitors alike to savor the tail end of the warm season. As the days shorten heading into October, it's evident that Freeport remains bathed in a golden glow, making September a delightful bridge between the vibrancy of summer and the introspection of autumn.

Monthly Sunshine Duration in Freeport: September Highlighted

The September sunshine duration represents the total number of hours Freeport 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.
JanFebMarAprMayJunJulAugSepOctNovDec146h185h258h247h300h332h336h339h288h223h191h174h
Data source: Freeport September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Freeport During September

In September, Freeport enjoys a 44% chance of sunny weather, marking a noticeable uptick after the summer months, where the chances dipped as low as 29% in July. This trend suggests that as the season transitions into fall, the likelihood of sunny days begins to increase, making early autumn a delightful time for outdoor activities. Compared to the preceding months of August and June, which hover around 33% and 39%, respectively, September’s skies appear more promising. As temperatures cool and the vibrancy of changing leaves adds to the charm, residents and visitors alike can look forward to a pleasantly sunny start to the fall season.

Percentage of Sunny Days in September in Freeport

The chart illustrates the percentage of sunny days in Freeport 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 Freeport experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec39%34%61%37%37%39%29%33%44%38%54%33%
Data source: Freeport September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Freeport in September

As summer gracefully gives way to fall, September in Freeport, United States, presents a gentle transition marked by approximately 12 hours of daylight. This timing reflects a gradual decline from the summer months, which boast the longest days of around 15 hours in both June and July. While early September still retains a hint of that summer brightness, the daylight hours begin to wane noticeably as the days shorten, foreshadowing the approaching autumn. This trend of diminishing light continues into October, with daylight reducing further to 10 hours, signaling a shift toward the cozy and reflective months ahead. The rhythm of the seasons is palpable, inviting residents to savor the beauty of nature as it prepares for the quieter winter months.

Average Daylight Hours in Freeport for September

The chart illustrates the variation in daylight duration in Freeport throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 19m10h 29m11h 57m13h 28m14h 45m15h 23m15h 2m13h 54m12h 27m10h 56m9h 37m8h 56m
Data source: Freeport daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Freeport

As summer transitions to autumn in Freeport, September's average wind speed settles at 4.5 m/s (10 mph), mirroring the gentle breezes of May and June. The month showcases a subtle shift from the calmer summer winds, which dipped to 3.8 m/s (8 mph) in July and further to 3.7 m/s (8 mph) in August. This moderate increase in September suggests a refreshing change, signaling the approach of fall. As we move towards October, the winds begin to pick up slightly, hinting at more vibrant autumn days ahead. Overall, this trend indicates that September serves as a delicate bridge between the stillness of summer and the brisk energy of the upcoming seasons.

Average September Wind Speed in Freeport

The chart displays monthly wind speed patterns in Freeport, 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.
JanFebMarAprMayJunJulAugSepOctNovDec5.65.46.15.14.55.03.83.74.5 m/s4.85.25.6
Data source: Freeport September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Freeport Compares to Other Months

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

September and January present starkly contrasting weather conditions. In September, temperatures range from a pleasant minimum of 9°C (48°F) to a comfortable maximum of 25°C (77°F), accompanied by moderate humidity levels around 71%. The month experiences around 81 mm (3.2 in) of precipitation over approximately 8 days, making it a relatively mild and wet transitional period. In contrast, January brings much colder weather, with temperatures plummeting to a minimum of -18°C (0°F) and averaging -2°C (30°F). This winter month sees even higher precipitation at 101 mm (4.0 in) across 9 days, coupled with higher humidity at 86%. The transition from September’s autumn warmth to January’s frigid chill illustrates the dramatic seasonal shifts. For more detailed information, you can check Freeport weather in January.

September weather is considerably milder compared to February, with average temperatures ranging from a minimum of 9°C (48°F) to a maximum of 25°C (77°F). In contrast, February experiences much colder temperatures, with averages from -15°C (5°F) to 12°C (54°F). While September sees moderate rainfall of 81 mm (3.2 in) over 8 days, February has higher precipitation at 104 mm (4.1 in) spread across 10 days, along with increased humidity levels of 84%. This stark difference highlights how September offers more pleasant, warm conditions, whereas February is characterized by frost and the chill of winter. For more details, you can refer to the weather conditions here: Freeport weather in February.

September and March present two distinct faces of the weather spectrum. In September, temperatures range from a mild 9°C (48°F) at night to a comfortable maximum of 25°C (77°F) during the day, accompanied by a reasonable average of 17°C (63°F). The month sees 81 mm (3.2 in) of precipitation over approximately 8 days, with humidity levels at 71%. In contrast, March is characterized by a much chillier climate, with night temperatures plummeting to a minimum of -14°C (7°F) and an average of just 1°C (34°F). The maximum temperature in March reaches only about 12°C (55°F), and while it has a slightly higher precipitation total of 92 mm (3.6 in) spread over 9 days, the humidity is slightly higher at 82%. For a more detailed overview of what to expect during this month, you can check out Freeport weather in March.

September and April present contrasting weather experiences. In September, average temperatures range from a cooler 9°C (48°F) at night to a pleasant 25°C (77°F) during the day, with a total precipitation of 81 mm (3.2 in) spread over about 8 days. Humidity levels hover around 71%, creating a mild atmosphere. In contrast, April is marked by lower temperatures, with a minimum of -2°C (28°F) and an average of only 6°C (43°F), making it considerably chillier. This month sees more rainfall, totaling 154 mm (6.1 in), and precipitation occurs on about 13 days, accompanied by a slightly higher humidity level of 80%. For more detailed information on how April weather affects the area, you can visit Freeport weather in April.

In comparing the weather between September and May, September boasts warmer temperatures, with averages reaching 17°C (63°F) and a maximum of 25°C (77°F). In contrast, May sees a cooler overall atmosphere, with an average temperature of 11°C (51°F) and a high of 22°C (73°F). Both months experience notable precipitation, but September typically has less rainfall at 81 mm (3.2 in) over 8 days, compared to May's 95 mm (3.8 in) spread across 11 days. Humidity levels are quite similar in both months, with September at 71% and May slightly higher at 72%. For more detailed insights on May weather, you can visit Freeport weather in May.

In comparing the weather between September and June, both months showcase similar temperature ranges, with September experiencing a minimum of 9°C (48°F) and an average of 17°C (63°F), while June also has a minimum of 9°C (48°F) but a slightly lower average of 16°C (60°F). The maximum temperatures are quite close, with September peaking at 25°C (77°F) and June slightly higher at 26°C (78°F). Precipitation is relatively consistent, with September receiving 81 mm (3.2 in) over 8 days compared to June's 77 mm (3.0 in) across 9 days. Humidity levels remain similar, at 71% in September and 72% in June. For a more detailed look at the June weather in Freeport, you can visit Freeport weather in June.

When comparing the weather in September and July, September typically offers cooler temperatures, with a minimum of 9°C (48°F) and an average of 17°C (63°F), whereas July's temperatures range from a minimum of 13°C (56°F) to an average of 19°C (67°F). July tends to be slightly warmer, reaching a maximum of 27°C (80°F) compared to September's maximum of 25°C (77°F). In terms of precipitation, July experiences more rainfall, averaging 112 mm (4.4 in) over 11 days, while September sees 81 mm (3.2 in) spread across 8 days, resulting in slightly higher humidity levels in September at 71% compared to July's 67%. For a more detailed look at July's climate in Freeport, you can visit Freeport weather in July.

September weather presents a noticeable shift from August, with cooler temperatures and slightly increased precipitation. In September, the minimum temperature drops to 9°C (48°F), compared to August’s milder 15°C (58°F), while the average temperature for September is 17°C (63°F) versus August's 20°C (68°F). Despite a similar number of rainy days—both months experiencing precipitation over 8 days—September sees a bit more rainfall at 81 mm (3.2 in) compared to August's 73 mm (2.9 in). Additionally, humidity in September rises to 71%, exceeding August's 66%, which can make the air feel more oppressive. For those looking to explore the specific weather conditions in August, you can find further details at Freeport weather in August.

September and October present a noticeable shift in weather patterns. In September, temperatures range from a mild minimum of 9°C (48°F) to a pleasant maximum of 25°C (77°F), with an average of 17°C (63°F). The month also experiences around 81 mm (3.2 in) of precipitation over about 8 days, along with a relative humidity of 71%. By contrast, October brings a cooler climate, with temperatures dropping to a minimum of 2°C (35°F), an average of 12°C (55°F), and a maximum of 20°C (68°F). Rainfall increases significantly to 170 mm (6.7 in) over about 13 days, while humidity rises slightly to 78%. This transition highlights the onset of fall, where wetter and cooler conditions become more pronounced. For more details on the weather, visit Freeport weather in October.

In September, temperatures are generally milder, with averages around 17°C (63°F) and maximums reaching up to 25°C (77°F), making it a comfortable month for outdoor activities. However, November brings a significant drop in temperature, with averages plummeting to about 6°C (43°F) and minimums dipping as low as -11°C (12°F). Additionally, November experiences more precipitation, totaling 134 mm (5.3 in) over 11 days compared to September's 81 mm (3.2 in) across 8 days. The humidity also rises in November, reaching 84%, compared to September's 71%. For a more detailed look at the weather patterns, check out Freeport weather in November.

September and December present stark contrasts in weather patterns. In September, temperatures range from a mild minimum of 9°C (48°F) to a pleasant average of 17°C (63°F), peaking at 25°C (77°F). The month experiences about 81 mm (3.2 in) of precipitation over roughly 8 days, with an average humidity of 71%. In contrast, December brings much colder temperatures, with a minimum of -17°C (1°F) and an average of just 1°C (34°F), reaching a maximum of 13°C (56°F). This winter month sees increased precipitation of 149 mm (5.9 in) over 11 days, and a higher humidity level of 81%. For more specific insights on temperatures, conditions, and activities, you may want to check Freeport weather in December.

Compare Freeport's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Freeport

As September rolls in, Freeport experiences a refreshing shift in weather, marking the transition into autumn. With an average temperature that gently dips, this month feels cooler compared to the warm summer months, inviting outdoor activities amidst the colorful foliage. While humidity remains notable, September also brings sporadic rain, with precipitation occurring on several days, ensuring the landscape stays vibrant. This unique blend of temperatures and occasional showers makes September an ideal time to explore the charm of Freeport. For a deeper understanding of how the climate evolves throughout the year, visit Freeport Climate.