September Weather in Intercourse, United States

Last updated: February 24, 2025

September in Intercourse, United States, showcases a dynamic weather pattern marked by a maximum temperature soaring to 33°C (92°F), while the average settles at a comfortable 21°C (70°F). As summer quietly fades, evening temperatures can dip as low as 5°C (41°F), introducing a refreshing chill. The month observes a moderate precipitation total of 112 mm (4.4 in) over 10 days, contributing to a humid atmosphere of 75% that enhances the lush surroundings. This blend of warmth and moisture creates an inviting landscape, perfect for outdoor activities and exploration of the picturesque locale.

September Temperature in Intercourse

As September rolls in, Intercourse, Pennsylvania experiences a delightful transition into early autumn. The temperatures range from a minimum of 5°C (41°F) to a maximum of 33°C (92°F), showcasing a comfortable average of 21°C (70°F) that invites outdoor activities and scenic fall explorations. This month stands out as a sweet balance between the lingering warmth of summer and the crispness of impending autumn, with clear daylight offering the perfect backdrop for apple picking and local festivals. As the nights grow cooler, the drop from summer's heat is evident, marking a shift that gradually leads into the more pronounced chill of October. Overall, September is a charming gateway to a season of harvest, rich colors, and pleasant weather.

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

The chart illustrates September temperature patterns in Intercourse, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec343743536372787569594538
Data source: Temperature data for Intercourse generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Intercourse

As September rolls into Intercourse, the region experiences a noteworthy shift in precipitation, receiving an average of 112 mm (4.4 in) over approximately 10 days of rain. Compared to the heavier downpours of August, which delivered 160 mm (6.3 in) across 16 days, September marks a return to more moderate conditions. This decrease in both volume and frequency signals the onset of a transition into autumn, as rainfall begins to taper off in preparation for the drier months ahead. Despite this reduction, the 112 mm received is still above the monthly averages of earlier months like October, emphasizing that while summer storms ease, September retains a robust rainfall profile.

September Precipitation Trends in Intercourse

The chart displays monthly precipitation patterns in Intercourse, 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.
JanFebMarAprMayJunJulAugSepOctNovDec6510610510213911915616011210090101
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Intercourse

As September rolls in, Intercourse, United States experiences a notable shift in humidity levels, dipping to 75% after a summer of lower readings. This marks a slight increase from August's 72%, suggesting a gradual transition from the warm, drier conditions typical of summer to the more humid atmosphere that accompanies the onset of fall. Notably, the humidity levels are higher than those seen in mid-summer, yet they remain lower than the 81% average recorded in October. This pattern reveals a consistent trend of declining humidity from January through August, followed by a steep rise as the cooler months approach, culminating in November's peak of 85%. Each seasonal shift paints a vivid picture of Intercourse's unique climatic rhythm, where cooler temperatures gradually embrace heightened moisture.

September Average Humidity in Intercourse

This chart illustrates the average monthly humidity levels in Intercourse, 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%83%81%78%79%74%72%75%81%85%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Intercourse

As summer winds down in September, Intercourse, Pennsylvania, experiences a UV Index of 8, indicating a very high exposure category. This slight dip from the peak summer months still necessitates caution, as burn time remains short at just 15 minutes. The trend from earlier in the year shows a steady increase in UV levels from a moderate 3 in January to the summer highs of 10 in June and July, followed by a gradual decline as autumn approaches. With the UV Index still quite elevated in September, residents and visitors should remain vigilant about sun safety. For detailed insights, check the Intercourse UV Index.

Maximum UV Index Levels in Intercourse for September

The chart shows the monthly maximum UV Index (UVI) for Intercourse 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.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Intercourse 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 Intercourse

As summer fades into fall, September in Intercourse, United States, bathes in a generous 266 hours of sunshine, making it a delightful transition month. Following the blazing peak of July with a substantial 347 hours, sunlight begins to wane, yet September maintains a vibrant glow, slightly lower than August's 308 hours. This gradual decline mirrors the shifting seasons, as autumn's cooler embrace prompts cozy gatherings and scenic strolls beneath the golden leaves. With an average of 222 hours to look forward to in October, this sunny September serves as a beautiful prelude to the rich hues and crisp air that characterize the harvest season ahead.

Monthly Sunshine Duration in Intercourse: September Highlighted

The September sunshine duration represents the total number of hours Intercourse 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.
JanFebMarAprMayJunJulAugSepOctNovDec137h172h242h246h268h311h347h308h266h222h219h181h
Data source: Intercourse September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Intercourse During September

In Intercourse, United States, September offers a promising 51% chance of sunny weather, making it one of the brighter months of the year. This marks a notable increase from the often overcast summer months, particularly July and August, which see only 48% and 33% sunny days, respectively. Moreover, September's sunny prospects are complemented by its position as a transitional month, standing out amidst the fluctuating weather patterns of late summer and early autumn. Interestingly, the likelihood of sunny days in September slightly surpasses that of both January and April, indicating a sweet spot for those seeking outdoor activities and scenic views. Overall, as the season shifts, September's weather hints at a delightful balance of warmth and sunshine, perfect for enjoying the great outdoors.

Percentage of Sunny Days in September in Intercourse

The chart illustrates the percentage of sunny days in Intercourse 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 Intercourse experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec39%28%54%42%39%36%48%33%51%36%55%32%
Data source: Intercourse September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Intercourse in September

In September, Intercourse, United States, experiences a gentle transition as daylight diminishes to 12 hours, signaling the onset of autumn. This gradual reduction follows a peak of 14 hours in the summer months of June through August. The shift from longer days to a more moderate duration reflects the changing seasons, emphasizing the region's natural rhythm. As October approaches with just 11 hours of daylight, residents can enjoy the rich hues of fall foliage, reminding us of the fleeting beauty of daylight that will soon give way to the shorter days of winter.

Average Daylight Hours in Intercourse for September

The chart illustrates the variation in daylight duration in Intercourse throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 40m10h 41m11h 58m13h 17m14h 24m14h 57m14h 39m13h 39m12h 24m11h 5m9h 56m9h 21m
Data source: Intercourse daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Intercourse

As summer's warmth gives way to the crispness of fall, September in Intercourse, United States, shows a slight uptick in wind speed, averaging 2.9 m/s (6 mph). This gentle breeze marks a transition from the stillness of the peak summer months, where winds languished as low as 2.1 m/s (5 mph) in August. The September winds are refreshing, offering a welcome change that hints at the invigorating gusts of autumn to come. Following this month, there’s a slight decrease to 2.8 m/s (6 mph) in October, suggesting that while the winds may soften, the vibrant seasonal shift continues to ripple through the air. Overall, this month captures the essence of nature's rhythm, bridging the warmth of summer and the chill of autumn, inviting both reflection and renewal.

Average September Wind Speed in Intercourse

The chart displays monthly wind speed patterns in Intercourse, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.23.23.63.43.02.52.32.12.9 m/s2.83.13.0
Data source: Intercourse September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Intercourse Compares to Other Months

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

September and January present strikingly different weather conditions. In September, temperatures range from a mild 21°C (70°F) on average, with highs reaching up to 33°C (92°F), along with 112 mm (4.4 in) of precipitation spread over 10 days and humidity levels of 75%. In contrast, January is characterized by much colder temperatures, with an average of just 1°C (34°F), lows plummeting to -19°C (-3°F), and maximums only reaching 18°C (65°F). While January sees less rainfall at 65 mm (2.6 in) over 8 days, humidity tends to be higher at 84%. For an in-depth look at January weather specifics, you can check out Intercourse weather in January.

September and February present starkly contrasting weather conditions. In September, temperatures range from a minimum of 5°C (41°F) to a maximum of 33°C (92°F), with an average of 21°C (70°F), making it a warm month. While the humidity is relatively high at 75%, rainfall typically occurs over about 10 days, totaling 112 mm (4.4 in). In contrast, February is much colder, with temperatures plummeting to a minimum of -17°C (2°F) and averaging just 3°C (38°F), peaking at 26°C (79°F). Precipitation in February is similar in amount at 106 mm (4.2 in), but it occurs over 12 days, along with a higher humidity of 83%. For a deeper dive into February's unique climate, you can check Intercourse weather in February.

September and March exhibit strikingly different weather patterns. In September, temperatures range from a minimum of 5°C (41°F) to a maximum of 33°C (92°F), with an average of 21°C (70°F), making it a warmer month overall. The precipitation level is slightly higher, totaling 112 mm (4.4 in) over about 10 days, and humidity sits at around 75%. In contrast, March experiences much cooler temperatures, with a minimum of -17°C (1°F) and an average of 6°C (43°F), reaching a maximum of 27°C (81°F). Precipitation levels are slightly lower at 105 mm (4.1 in), also spread over 10 days, but humidity is higher at 83%. For a closer look at the conditions during this month, you can visit Intercourse weather in March.

When comparing the weather of September and April, notable differences emerge. September typically enjoys warmer temperatures, with average highs reaching 21°C (70°F) and maximum temperatures peaking at 33°C (92°F). In contrast, April's temperatures are cooler overall, characterized by an average of 12°C (54°F) and maximums of 30°C (87°F).

Precipitation levels are somewhat similar in both months, with September recording 112 mm (4.4 in) over 10 days and April slightly lower at 102 mm (4.0 in) across the same number of days. However, September's humidity sits at 75%, while April is slightly more humid at 81%. For more specific insights about April, you can visit Intercourse weather in April.

When comparing the weather in September and May, there are some notable distinctions. September tends to be warmer, with average temperatures reaching 21°C (70°F) and a maximum of 33°C (92°F), whereas May has an average of 17°C (64°F) and peaks at 34°C (93°F). Both months experience significant precipitation, but September records 112 mm (4.4 in) over approximately 10 days, compared to May's 139 mm (5.5 in) across 14 days. Additionally, humidity levels are slightly higher in May at 78% compared to 75% in September. For a detailed look at May's weather, you can check Intercourse weather in May.

In comparing the weather of September and June, both months exhibit warm temperatures, but September tends to be slightly cooler on average. In September, temperatures range from a minimum of 5°C (41°F) to a maximum of 33°C (92°F), with a comfortable average of 21°C (70°F). In contrast, June has a higher minimum temperature of 9°C (48°F) and can reach up to 36°C (97°F), averaging around 22°C (73°F). Precipitation is relatively similar, with September receiving 112 mm (4.4 in) over 10 days and June slightly wetter, at 119 mm (4.7 in) across 13 days. Humidity is also comparable, hovering around 75% in September and increasing slightly to 79% in June, which can contribute to a muggy feel. For more detailed information about June's weather, you can check out Intercourse weather in June.

When comparing the weather in September and July, notable differences emerge. September experiences a more moderate temperature range, with a minimum of 5°C (41°F) and a maximum of 33°C (92°F), compared to July's warmer minimum of 13°C (55°F) and maximum of 36°C (97°F). July tends to be hotter overall, with an average temperature of 25°C (78°F), while September averages around 21°C (70°F). Precipitation is also more frequent in July, with 156 mm (6.1 in) over 13 days, compared to September's 112 mm (4.4 in) over 10 days. Humidity levels remain similar, with September at 75% and July at 74%. For more insights on July’s weather, check this link: Intercourse weather in July.

In comparing September and August weather, it is evident that September experiences a tangible drop in temperatures, with a minimum of 5°C (41°F) and an average of 21°C (70°F), whereas August boasts higher averages, with a minimum of 13°C (55°F) and an average of 24°C (75°F). Additionally, September sees slightly less precipitation, totaling 112 mm (4.4 in) over 10 rainy days, compared to August's heavier rainfall of 160 mm (6.3 in) across 16 days. Despite these differences, the humidity in both months remains relatively high, with September recording 75% and August slightly lower at 72%. For more details about August weather patterns, you can refer to Intercourse weather in August.

September typically experiences warmer temperatures with an average of 21°C (70°F) and peaks reaching up to 33°C (92°F). In contrast, October cools down significantly, with an average temperature of 15°C (60°F) and a minimum dropping to 1°C (35°F). Precipitation levels are somewhat similar in both months, with September averaging 112 mm (4.4 in) and October slightly lower at 100 mm (3.9 in), though both months see rain for about 10 days. Additionally, October tends to have a higher humidity level at 81%, compared to September's 75%. For more detailed insights into October weather, you can visit Intercourse weather in October.

September typically features warmer temperatures with a minimum of 5°C (41°F) and an average high of 33°C (92°F), making it a much more summery month. In contrast, November experiences cooler conditions, with temperatures dipping to a minimum of -7°C (19°F) and averaging only 7°C (45°F). While September has a higher average rainfall of 112 mm (4.4 in) over about 10 days, November sees slightly less precipitation at 90 mm (3.5 in) over 8 days. Notably, November has a higher humidity level at 85%, compared to September's 75%. For more detailed insights, you can check Intercourse weather in November.

In September, the weather is markedly warmer, with temperatures ranging from a minimum of 5°C (41°F) to a maximum of 33°C (92°F) and an average of 21°C (70°F). The month experiences considerable humidity at 75% and receives around 112 mm (4.4 in) of precipitation over 10 days. In contrast, December brings a stark change, with much cooler temperatures that can drop as low as -12°C (10°F) and an average of just 3°C (38°F). Although precipitation slightly decreases to 101 mm (4.0 in) over about 9 days, humidity rises to 84%, contributing to a crisp winter atmosphere. For a more detailed look at what to expect, visit Intercourse weather in December.

Compare Intercourse's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Intercourse

As September graces Intercourse, it brings a delightful transition from the sweltering summer months to the cooler embrace of autumn. With temperatures that can peak at 33°C (92°F) while often settling at a comfortable average of 21°C (70°F), this month strikes a perfect balance. Although rainfall makes its presence felt with 10 days contributing to a total of 112 mm (4.4 in), the air remains humid at 75%, creating a cozy atmosphere ideal for outdoor activities. This unique blend of warmth and moisture differentiates September from the drier, hotter summer months and sets the stage for the crisp, refreshing days ahead. For more insights into the captivating climate of this region, explore Intercourse Climate.