Last updated: February 24, 2025
In September, Potomac Park experiences a dynamic range of temperatures, with maximums peaking at 35°C (96°F), an average of 20°C (69°F), and lows dipping to 1°C (34°F). This transitional month sees a total precipitation of 114 mm (4.5 in) over approximately 9 days, contributing to a humidity level of 68%. As summer fades and autumn approaches, visitors can expect a mix of warm, sunny days interspersed with refreshing rain, making it an ideal time to explore the natural beauty of the park.
In September, Potomac Park experiences a gentle transition from the sweltering summer heat to the cooler embrace of autumn. With minimum temperatures dipping to a comfortable 1°C (34°F), the month boasts an average of 20°C (69°F), allowing for pleasant outdoor activities. Daytime peaks can reach up to 35°C (96°F), echoing the warmth of August while hinting at the upcoming seasonal shift. This blend of mild evenings and warm days creates an inviting atmosphere, perfect for enjoying the park's scenic beauty before the chill of October sets in. As nature begins to change, September serves as a reminder of the fleeting warmth, inviting visitors to savor every moment.
In September, Potomac Park experiences a notable uptick in precipitation, matching the highest monthly total with 114 mm (4.5 in), similar to the preceding month of May. This surge occurs over 9 days, slightly fewer than the summer months of July and August, suggesting a transition to wetter conditions as the region heads into autumn. The consistent rainfall reflects a trend where late summer and early fall often bring substantial moisture, which can invigorate the landscape and support the lush greenery characteristic of this area. As the year progresses, Potomac Park's weather continues to reveal the delicate balance between rain and dry spells, highlighting the region's dynamic climate.
In Potomac Park, September marks a notable shift in humidity levels as the intense summer heat gives way to the gentle embrace of early fall. The average humidity for this month is 68%, a significant drop from the 59% experienced in August, indicating a slight return of moisture in the air. This trend highlights a gradual transition, where humidity begins to converge towards the higher levels typical of the later months, such as 80% in October and 86% in November. As the year progresses, the humider conditions reemerge, reminding us of the characteristic climate patterns that define Potomac Park throughout the seasons.
In September, Potomac Park experiences a UV Index of 8, indicating a very high exposure category and a burn time of just 15 minutes. This trend reflects the gradual decline from the peak UV levels of the summer months, where the index consistently reached 10. Despite the slight decrease, September still presents significant sun exposure, so it's essential to remain cautious outdoors. As the year progresses into October, a further dip to a high UV Index of 7 allows for a bit more comfort but still requires attention to sun safety. For more detailed insights on the UV conditions throughout the year, visit Potomac Park UV Index.
UV Risk Categories
September in Potomac Park shines with a remarkable 274 hours of sunlight, marking it as one of the year’s brightest months. The trend of increasing sunshine hours reaches a peak during the summer, with July basking in the most hours at 348. However, as the season transitions into autumn, September still holds onto a generous amount of sun, notably outshining the earlier months of the year. This month serves as a bridge between the vibrant energy of summer and the softer hues of fall, making it a cherished time for outdoor activities as daylight begins to wane into October's shorter, 232 hours. Overall, September stands out as a golden opportunity to enjoy lingering warm days before the cooler months set in.
In Potomac Park, the transition from summer to fall brings a compelling increase in the likelihood of sunny weather in September, reaching an optimistic 52% chance. This marks a slight rise from the 51% seen in both March and July, suggesting that September often enjoys a delightful balance of warmth and brightness. As the year progresses, the trend shows a peak in sunshine likelihood during these late summer months, making September an appealing time for outdoor activities. While the months leading into it, such as August (39%) and June (38%), exhibit lower chances of sun, September stands out as a beacon of favorable weather, perfect for enjoying the vibrant autumn scenery that begins to unfold.
As September unfolds in Potomac Park, the days begin to wane, with daylight lasting about 12 hours. This marks a gentle decline from the 14 hours of sunlight enjoyed during the peak summer months of June, July, and August. The transition is evident as the vibrant energy of summer gradually gives way to the more subdued hues of autumn. September serves as a bridge, offering a mix of warmth while hinting at the shorter days ahead in October, which will see daylight shrink to 11 hours. This shift not only transforms the scenery but also evokes a sense of change, as nature prepares for the coming cooler months.
As the warm embrace of summer gives way to the crisp air of fall, September in Potomac Park reveals a gentle shift in wind patterns. With an average wind speed of 2.3 m/s (5 mph), September mirrors the mellow breeziness of the preceding months, showcasing a slight recovery from the summer lull. Notably, this month stands as a bridge between the sweltering July and August, which experienced their lowest wind speeds of the year, and the breezier autumn months ahead. Moving into October and November, the wind picks up just a notch, consistently holding at 2.3 m/s (5 mph) in October before increasing to 2.5 m/s (6 mph) in November. This trend highlights September's position as a transitional period, where the last whispers of summer are gently swept away, paving the way for the invigorating gusts of autumn.
The weather in Potomac Park 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 Potomac Park and find detailed weather information for every month.
September and January display starkly contrasting weather patterns. In September, temperatures range from a mild 1°C (34°F) at night to a sweltering 35°C (96°F) during the day, with an average of 20°C (69°F) and significant humidity at 68%. The month typically sees about 114 mm (4.5 in) of rain over approximately 9 days. In contrast, January experiences much colder conditions, with temperatures plunging to a minimum of -27°C (-16°F), an average of 0°C (33°F), and a maximum reaching only 20°C (69°F). Although it is drier, with 61 mm (2.4 in) of precipitation over 7 days, January's humidity is notably higher at 86%. For a closer look at what to expect, visit Potomac Park weather in January.
September and February present striking contrasts in weather conditions. September boasts a warm average temperature of 20°C (69°F), reaching sunny highs of 35°C (96°F), making it a pleasant month for outdoor activities. However, it experiences significant humidity at 68% and about 114 mm (4.5 in) of precipitation over 9 days. In contrast, February is much colder, with an average temperature of just 3°C (37°F) and lows plunging to -18°C (-1°F). While it has a maximum temperature of 27°C (80°F), February is marked by higher humidity at 86% and some precipitation, totaling 95 mm (3.8 in) over 11 days. For a closer look at what to expect, check out the details on Potomac Park weather in February.
When comparing the weather in September and March, there is a striking contrast in temperatures and humidity levels. September typically enjoys a warm average temperature of 20°C (69°F) with highs reaching up to 35°C (96°F), while March experiences cooler conditions with an average of just 6°C (43°F) and maximums of 24°C (76°F). Precipitation is more abundant in September, with 114 mm (4.5 in) over 9 days, compared to March's 77 mm (3.0 in) over 10 days. Additionally, March tends to be more humid, with humidity levels at 86% compared to September's 68%. For more detailed insights on March weather, you can visit Potomac Park weather in March.
In comparing the weather between September and April, we see notable differences in temperature and humidity. September experiences a wider temperature range, with minimums of 1°C (34°F) and maximums reaching as high as 35°C (96°F), while April brings chillier conditions with minimums of -6°C (22°F) and maximums of 31°C (87°F). Rainfall is also a factor; September sees 114 mm (4.5 in) of precipitation over 9 days, whereas April has slightly less at 95 mm (3.8 in) over 12 days. Additionally, April is marked by higher humidity at 84%, compared to September's 68%, making the former feel more damp. For more detailed information about weather in April, you can check out Potomac Park weather in April.
September and May exhibit notable differences in their weather patterns despite similar average precipitation levels of 114 mm. In September, temperatures range from a minimum of 1°C (34°F) to a maximum of 35°C (96°F), showcasing the tail end of summer with warmer days. Conversely, May's temperatures are slightly cooler, with a minimum of -1°C (31°F) and a maximum of 31°C (89°F), reflecting the transition into warmer months. Additionally, while both months experience substantial humidity—68% in September and 78% in May—May tends to see more rainy days, with precipitation occurring on 14 days compared to September's 9 days. For more insights, you can check Potomac Park weather in May.
In comparing the weather of September and June, both months experience maximum temperatures around 35°C (95°F), but their overall climate differs. September tends to be slightly warmer at an average of 20°C (69°F) compared to June's 22°C (71°F). Humidity levels in June are higher at 79%, making it feel more muggy, while September has a lower humidity of 68%. Additionally, September sees more precipitation with 114 mm (4.5 in) over roughly 9 days, compared to June's 83 mm (3.3 in) over 10 days. For more specific information on the weather in June, you can visit Potomac Park weather in June.
September and July present contrasting weather patterns. In September, temperatures range from a minimum of 1°C (34°F) to a maximum of 35°C (96°F), with an average of 20°C (69°F), indicating a wider temperature fluctuation. In contrast, July maintains milder minimum temperatures at 12°C (54°F) and peaks at 37°C (99°F) with a higher average of 25°C (78°F). Additionally, September experiences more rainfall, totaling 114 mm (4.5 inches) over approximately 9 days, compared to July's 60 mm (2.4 inches) over 8 days, with a slightly higher humidity level of 68% versus July's 70%. For more detailed information, check out the Potomac Park weather in July.
September generally experiences cooler temperatures compared to August, with nighttime lows dropping significantly from an average of 10°C (50°F) in August to just 1°C (34°F) in September. The average temperature in September is 20°C (69°F), a notable decrease from August’s warmer average of 24°C (75°F). Additionally, September tends to be wetter, garnering 114 mm (4.5 in) of precipitation over 9 days, compared to the 68 mm (2.7 in) over 12 days in August. Humidity levels also rise in September to 68%, compared to 59% in August, making the air feel more humid despite cooler temperatures. For more detailed information, you can check the Potomac Park weather in August.
September typically brings warmer temperatures, with an average of 20°C (69°F) and a maximum reach of 35°C (96°F). In contrast, October cools down significantly, featuring an average temperature of 14°C (58°F) and a minimum that can drop to -2°C (28°F). While September experiences around 114 mm (4.5 in) of precipitation over 9 days, October sees slightly less precipitation at 93 mm (3.7 in) across 8 days. Furthermore, October tends to be more humid, with humidity levels reaching 80% compared to September's 68%. For more details on what to expect weather-wise, you can visit Potomac Park weather in October.
September and November present a stark contrast in weather conditions. In September, temperatures can soar, with a minimum of 1°C (34°F) and highs reaching up to 35°C (96°F), accompanied by relatively moderate humidity of 68% and a total precipitation of 114 mm (4.5 in) over 9 days. By November, the temperatures drop significantly, with a minimum of -9°C (17°F) and a peak of 25°C (77°F), averaging only 6°C (43°F). The month experiences less rainfall, totaling 59 mm (2.3 in) over 7 days, but humidity rises to a notable 86%. For more detailed information, check Potomac Park weather in November.
The weather in September features a much warmer temperature range, with minimums of 1°C (34°F) and maximums reaching as high as 35°C (96°F). In contrast, December brings chillier conditions, where temperatures can dip as low as -14°C (7°F) with an average of 3°C (37°F) and maximums of 22°C (72°F). September typically experiences more moderate humidity levels at 68% and greater rainfall of 114 mm (4.5 in) over about 9 days, while December sees increased humidity at 85% but less precipitation, totaling 85 mm (3.4 in) across 8 days. For more information on December weather, you can check Potomac Park weather in December.
September in Potomac Park offers a striking transition from the summer’s sweltering heat to the cooler, crisp days of autumn. With maximum temperatures occasionally soaring to 35°C (96°F), the month still embraces significant warmth, yet it is balanced by an average of 20°C (69°F), making for comfortably pleasant evenings. This month also witnesses an uptick in precipitation, with approximately 114 mm (4.5 in) of rain over 9 days, contributing to the lushness of the landscape. The humidity of 68% adds a touch of stickiness typical of late summer, but as the leaves begin to change, September sets the stage for a beautiful seasonal transition. For a detailed look at how September compares with other months, check out Potomac Park Climate.