September Weather in Yorktown, United States

Last updated: February 24, 2025

In September, Yorktown experiences a delightful transition with average temperatures around 24°C (75°F), peaking at a warm 32°C (89°F), while dipping to a comfortable 14°C (58°F) during the cooler nights. This month also brings about a moderate level of humidity at 78%, adding a touch of tropical feel to the atmosphere. Rainfall is prevalent, with 130 mm (5.1 inches) of precipitation spread over approximately 10 days, making it essential to embrace the unpredictable showers amidst the warm sunshine. Expect a mix of vibrant weather patterns that enrich the beauty of early autumn in this charming coastal town.

September Temperature in Yorktown

As summer transitions into autumn, September in Yorktown showcases a delightful blend of warmth and cooling breezes. With minimum temperatures starting at a mild 14°C (58°F) and rising to comfortable maximums of 32°C (89°F), residents can enjoy pleasant outdoor activities or simply soak in the lingering sun. The average temperature hovers around 24°C (75°F), offering a perfect backdrop for early fall festivities. This month marks a noticeable shift from the sweltering heat of July and August, presenting more moderate and enjoyable days, making September a favorite for many who appreciate the balance between the vibrant summer warmth and the crispness of autumn air.

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

The chart illustrates September temperature patterns in Yorktown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec414549586775807975665246
Data source: Temperature data for Yorktown 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 Yorktown

In September, Yorktown experiences a notable precipitation level of 130 mm (5.1 in), making it one of the wetter months of the year. This figure reflects a slight decline from the peak rainfall experienced in August, which saw 150 mm (5.9 in) over 14 days of rain. Interestingly, September maintains a similar pattern in terms of rainfall frequency, with around 10 days of precipitation. Overall, this month serves as a transitional phase, as it balances the lingering summer storms of August with the approach of drier autumn months, such as October, which typically records 110 mm (4.3 in). The trends indicate a return to more moderate weather patterns, as September bridges the gap between summer humidity and cooler fall climates.

September Precipitation Trends in Yorktown

The chart displays monthly precipitation patterns in Yorktown, 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.
JanFebMarAprMayJunJulAugSepOctNovDec98135981031079912515013011186106
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Yorktown

As summer draws to a close, September in Yorktown brings a noticeable shift in humidity, dipping to 78%. This decline marks a gentle transition from the peak summer levels, which hovered around 81% in both July and August. Following the trend of decreasing humidity that begins in the warmer months, September paves the way for a more comfortable autumn. Interestingly, this month's humidity is part of a broader pattern; humidity is typically highest in the winter months of January and February, fluctuating back up to 84% by November and December. Overall, the shift to September's lower humidity creates a refreshing change, inviting residents to enjoy the golden days of early fall.

September Average Humidity in Yorktown

This chart illustrates the average monthly humidity levels in Yorktown, 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.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%82%81%80%82%81%81%78%80%84%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Yorktown

As September rolls into Yorktown, the UV Index reflects a notable trend from the sweltering peak of summer. With a UV Index of 8, classified as very high, residents can expect a burn time of just 15 minutes under direct sunlight. This decline from July’s extreme levels, which reached an Index of 11, indicates a gradual easing of the sun's intensity, though caution is still warranted. Maintaining sun safety practices is crucial, as the UV Index remains elevated, aligning with October’s similar readings. Enjoy the warm days while staying protected! For more insights, visit Yorktown UV Index.

Maximum UV Index Levels in Yorktown for September

The chart shows the monthly maximum UV Index (UVI) for Yorktown 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.
JanFebMarAprMayJunJulAugSepOctNovDec3679101011108853
Data source: Yorktown 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 Yorktown

As summer transitions into autumn, September in Yorktown showcases a delightful 292 hours of sunshine, marking a gentle decline from the peak brightness of July and August. This month captures the essence of a fading summer while hinting at the crispness of fall. The trend reveals that sunshine hours begin their gradual descent after the high of 353 hours in July, with September still holding onto a generous amount of daylight. This comfortable balance allows residents to relish the warm days of early autumn, making it a perfect time for outdoor activities before the colder months settle in. The prolonged sunshine in these late summer days offers a tranquil respite, as Yorktown welcomes the change of season with open arms.

Monthly Sunshine Duration in Yorktown: September Highlighted

The September sunshine duration represents the total number of hours Yorktown 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.
JanFebMarAprMayJunJulAugSepOctNovDec166h185h263h292h315h331h353h331h292h262h228h200h
Data source: Yorktown September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Yorktown During September

In Yorktown, September ushers in a refreshing shift in weather patterns, boasting a 59% chance of sunny days, making it one of the sunniest months of the year. Following the hazy and humid summer months, where the likelihood of sunshine hovers around the mid-40s, September stands out as a beacon of clarity. This upward trend not only enhances the beauty of early fall but also invites outdoor activities and gatherings. As we transition into autumn, the subtle increase in sunny weather continues, setting the stage for a vibrant landscape and enjoyable experiences. Overall, September is a delightful reprieve, promising more moments spent basking in the sun compared to its summer predecessors.

Percentage of Sunny Days in September in Yorktown

The chart illustrates the percentage of sunny days in Yorktown 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 Yorktown experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec50%33%45%55%49%41%49%44%59%45%60%45%
Data source: Yorktown September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Yorktown in September

As summer fades into autumn in Yorktown, September marks a gentle transition with 12 hours of daylight. Following the peak sunlight of 14 hours experienced during the height of summer in June and July, daylight begins to wane slightly, reflecting the seasonal shift. The decrease is gradual, as daylight had already started to diminish from the lush, sun-filled days of August, which boasted 13 hours. This pattern sets the stage for October, where daylight further declines to 11 hours, leading us closer to the shorter days of winter. Thus, September serves as a beautiful bridge between the vibrant, lengthy days of summer and the cozy, shorter days of fall, inviting residents to savor the sweet spot of lingering warmth and gradual change.

Average Daylight Hours in Yorktown for September

The chart illustrates the variation in daylight duration in Yorktown throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 54m10h 49m11h 59m13h 10m14h 10m14h 40m14h 23m13h 30m12h 22m11h 11m10h 9m9h 37m
Data source: Yorktown daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Yorktown

As September rolls into Yorktown, the winds start to pick back up, with an average speed of 4.1 m/s (9 mph), gently shifting away from the summer's calming breezes. This modest increase marks a slight revival from the low of 3.2 m/s (7 mph) in August, indicating a transition into the more dynamic autumn season. Throughout the year, Yorktown's wind speeds typically fluctuate, with the highest gusts seen in the cooler months leading up to winter. Observing the larger trend, September's winds suggest a gradual warming and revitalization, setting the stage for the refreshing, crisp air of October, which averages 4.6 m/s (10 mph). This pattern underscores a rhythmic cycle where summer's stillness gives way to the invigorating breezes of fall, inviting residents and visitors alike to embrace the changing season.

Average September Wind Speed in Yorktown

The chart displays monthly wind speed patterns in Yorktown, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.45.34.74.74.24.03.83.24.1 m/s4.64.84.3
Data source: Yorktown September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Yorktown Compares to Other Months

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

In September, the weather in Yorktown is warm and humid, with average temperatures ranging from a mild 14°C (58°F) at night to a hot 32°C (89°F) during the day. The month experiences significant rainfall, totaling 130 mm (5.1 in) over about 10 days, contributing to the high humidity level of 78%. In contrast, January brings a sharp decline in temperatures, with averages hovering around 5°C (41°F) and a maximum of 19°C (67°F), alongside colder nights dropping to -12°C (12°F). Although January has less precipitation at 98 mm (3.9 in) across approximately 9 days, the humidity remains high at 84%. For a more detailed view of the conditions in January, you can visit Yorktown weather in January.

When comparing the weather in September and February, it is clear that the two months offer vastly different climates. September typically experiences milder temperatures, ranging from a chilly minimum of 14°C (58°F) to a warm maximum of 32°C (89°F), with an average temperature of 24°C (75°F). The month also sees significant rainfall, with about 130 mm (5.1 in) over approximately ten days, accompanied by a humidity level of 78%.

In contrast, February presents a much cooler atmosphere, with temperatures dropping to a minimum of -5°C (23°F) and a maximum of 20°C (68°F), averaging around 7°C (45°F). February also has a slightly higher rainfall of 135 mm (5.3 in), spread over about twelve days, and a humidity level of 83%. For those looking for more detailed information, check out Yorktown weather in February. Overall, while September tends to be warm and humid, February offers a much colder and wetter experience.

September and March present contrasting weather patterns in Yorktown. In September, temperatures range from a mild 14°C (58°F) at night to a warm 32°C (89°F) during the day, with an average of 24°C (75°F). The month is relatively humid at 78%, and experiences significant rainfall, totaling 130 mm (5.1 in) over about 10 days. In sharp contrast, March sees much cooler temperatures, with a minimum of -3°C (28°F) and a maximum of 25°C (76°F), averaging just 9°C (49°F). The humidity rises slightly to 82%, and precipitation is lower at 98 mm (3.9 in), also spread over 10 days. For more specific details about March weather in Yorktown, visit Yorktown weather in March.

In comparing the weather of September and April, we see a notable contrast. September typically experiences warmer temperatures, ranging from a minimum of 14°C (58°F) to a maximum of 32°C (89°F), with an average of 24°C (75°F). In contrast, April is significantly cooler, with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 27°C (81°F) and an average of only 15°C (59°F).

Precipitation levels are relatively similar; September sees about 130 mm (5.1 in) of rain over 10 days, while April has slightly less rain at 103 mm (4.0 in) over 11 days. Humidity levels are also quite close, with September averaging 78% and April slightly higher at 81%. For more detailed insights on how April weather specifically plays out in Yorktown, you can check out Yorktown weather in April.

In comparing the weather between September and May, one can observe a distinct shift in temperatures and conditions. September boasts warmer temperatures, with a minimum of 14°C (58°F) and an average of 24°C (75°F), while May starts cooler, with a minimum of 6°C (43°F) and an average of 20°C (67°F). Both months reach a maximum of around 32°C (90°F), demonstrating similar peak temperatures. However, September experiences more rainfall with 130 mm (5.1 in) across 10 days, compared to May's 107 mm (4.2 in) over 11 days, although the humidity levels are quite comparable at around 78% in September and 80% in May. For a detailed look at May's weather, you can visit Yorktown weather in May.

In comparing the weather of September and June, we see that both months experience similar average temperatures, with June averaging 24°C (76°F) and September also averaging 24°C (75°F). However, September tends to be slightly warmer with maximum temperatures reaching 32°C (89°F), while June's peak can reach 32°C (90°F). Precipitation levels differ, as September receives more rainfall at 130 mm (5.1 in) across 10 days, compared to June's 99 mm (3.9 in) over 11 days. Additionally, humidity is marginally higher in June at 82% versus September's 78%. For those interested in the specifics of June weather, you can check Yorktown weather in June.

In comparing the weather of September and July, September tends to be milder, featuring average temperatures of 24°C (75°F) compared to July's warmer average of 27°C (81°F). While both months experience notable humidity, September’s levels are slightly lower at 78%, compared to July’s 81%. Precipitation is somewhat consistent, with September receiving 130 mm (5.1 in) over about 10 days, while July sees slightly less at 125 mm (4.9 in) over 12 days. For a deeper insight into July's weather specifics, visit Yorktown weather in July.

In comparing the weather of September and August, September tends to be slightly cooler, with average temperatures ranging from a minimum of 14°C (58°F) to a maximum of 32°C (89°F), while August features warmer conditions, with an average range of 19°C (66°F) to 33°C (92°F). Precipitation levels in September reach 130 mm (5.1 in) over 10 days, which is somewhat lower than August’s 150 mm (5.9 in) across 14 days. Humidity remains relatively high in both months, but is marginally lower in September at 78%, compared to August's 81%. For more detailed insights, check out Yorktown weather in August.

In comparing the weather of September and October, it’s evident that October experiences a noticeable drop in temperatures, with a minimum of 7°C (45°F) compared to September's 14°C (58°F). The average temperature in October is 19°C (66°F), significantly cooler than September's average of 24°C (75°F). While the maximum temperature in October reaches 29°C (85°F), it still falls short of September’s peak of 32°C (89°F). Additionally, both months receive substantial rainfall, with September seeing 130 mm (5.1 in) and October slightly less at 110 mm (4.3 in), although both months have precipitation on about 10 days. Interestingly, October maintains a higher humidity level at 80% compared to September's 78%. For more specifics on October weather, you can visit Yorktown weather in October.

September and November showcase a significant contrast in weather patterns. September typically enjoys warmer temperatures, with minimums around 14°C (58°F) and average highs reaching up to 32°C (89°F), while November experiences much cooler conditions, with lows dropping to 0°C (33°F) and an average of just 11°C (53°F). Precipitation differs as well, with September seeing 130 mm (5.1 in) over about 10 days, compared to November's 86 mm (3.4 in) spread across 8 days. Additionally, November tends to have a slightly higher humidity level at 84%, compared to September’s 78%. For more details on November weather, you can visit Yorktown weather in November.

September and December present stark contrasts in weather conditions. September typically boasts warmer temperatures, with a minimum of 14°C (58°F) and an average of 24°C (75°F), peaking at 32°C (89°F). The month sees significant rainfall, totaling 130 mm (5.1 in) over about 10 days, supplemented by a relative humidity of 78%. In contrast, December experiences much cooler weather, with temperatures ranging from a minimum of -5°C (23°F) to a maximum of 20°C (68°F), and an average of just 8°C (46°F). While precipitation is slightly less at 106 mm (4.2 in) over 11 days, the humidity rises to 84%. For further insights on the weather in December, you can check out Yorktown weather in December.

Compare Yorktown's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Yorktown

As summer gently transitions into fall, September in Yorktown showcases a delightful blend of warmth and moisture. The temperatures are notably milder than the peak summer months, providing a comfortable average that invites outdoor activities. While the humidity remains high, it also contributes to the lush, vibrant scenery that characterizes this time of year. September stands out with its increased precipitation, typically offering refreshing rain that nourishes the landscape. This month is a captivating escape from the sweltering heat of summer, making Yorktown an inviting destination for those seeking to enjoy the beauty of changing seasons. For more insights into yearly weather patterns, check out Yorktown Climate.