September Weather in Rhondda, United Kingdom

Last updated: March 17, 2025

September in Rhondda, United Kingdom, showcases a dynamic climate where maximum temperatures can soar to 27°C (81°F), offering a taste of late summer warmth. However, the average temperature settles at a milder 13°C (56°F), bringing a chill that can dip as low as 2°C (36°F) at night. The region experiences considerable precipitation, with 92 mm (3.6 in) of rain falling over approximately 13 days, contributing to its lush landscapes. With a humidity level of 79%, September in Rhondda is a month of contrasts, where warm days meet cool nights, and rain is a frequent companion, making it a unique experience for residents and visitors alike.

September Temperature in Rhondda

In September, Rhondda, United Kingdom, begins to transition from the warmth of summer to the crispness of autumn. Average temperatures settle around 13°C (56°F), while daytime highs can reach up to 27°C (81°F), offering a final taste of summer warmth. As the month progresses, nights grow cooler, with minimum temperatures dipping to about 2°C (36°F). This blend of warmth during the day and refreshing coolness at night creates an inviting atmosphere, perfect for enjoying the stunning fall landscapes. Overall, September is characterized by a delightful mix of lingering warmth and the first hints of autumn chill, making it a charming time to explore this beautiful region.

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

The chart illustrates September temperature patterns in Rhondda, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec404143475258615956514543
Data source: Temperature data for Rhondda 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 Rhondda

In September, Rhondda experiences a notable transition in precipitation patterns, recording 92 mm (3.6 in) of rainfall over 13 days. This amount reflects a slight decrease from the preceding month's 114 mm, while still maintaining a consistent level of wet weather typical for this time of year. As summer wanes, the rain tends to moderate, bridging the gap between the wetter months of autumn that follow. The frequency of precipitation days in September mirrors that of July and May, suggesting a steady rhythm in rainfall that is both refreshing and essential for the region's lush landscapes. With October looming, residents and visitors can anticipate an uptick in rainfall as the region gears up for its wettest months.

September Precipitation Trends in Rhondda

The chart displays monthly precipitation patterns in Rhondda, 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.
JanFebMarAprMayJunJulAugSepOctNovDec821241116493919311492143117144
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Rhondda

In September, the humidity in Rhondda, United Kingdom, settles at a moderate 79%, marking a slight decrease from the summer months. This transition reflects a typical pattern as the region shifts from the warmer, more humid summer, where humidity peaked at 73% in August and 70% in July, to the cooler, damp conditions of autumn. As October approaches, humidity rises again to 89%, suggesting that the latter part of the year reintroduces the signature dampness characteristic of Rhondda's climate. Throughout the year, humidity remains consistently high, showcasing Rhondda's status as a region where atmospheric moisture is a defining feature, particularly in the colder months when levels soar back to 89% or even 90% in November.

September Average Humidity in Rhondda

This chart illustrates the average monthly humidity levels in Rhondda, 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.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%86%84%80%80%70%73%79%89%90%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Rhondda

As September unfolds in Rhondda, United Kingdom, residents can expect a UV Index of 6, placing it in the high exposure category with a burn time of just 25 minutes. This marks a slight decline from the peak summer months, where the UV Index soared to levels of 8, indicating that while the days are getting shorter, protective measures against UV rays remain essential. In contrast to early spring, when the index first began rising, September’s UV levels still demand caution, making it crucial to stay vigilant when enjoying outdoor activities. For those looking to understand how to adapt their sun safety practices throughout the year, detailed information can be found at Rhondda UV Index.

Maximum UV Index Levels in Rhondda for September

The chart shows the monthly maximum UV Index (UVI) for Rhondda 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.
JanFebMarAprMayJunJulAugSepOctNovDec124678876421
Data source: Rhondda 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 Rhondda

September in Rhondda, United Kingdom, marks a delightful transition in sunlight as the days start to shorten. With 296 hours of sunshine, it stands as a significant contrast to the sun-drenched peak of July, which boasts 410 hours. While sunshine levels gradually decline from the summer's zenith, September retains a notable warmth, outshining the dreary months ahead, like November and December, which offer a mere 128 and 104 hours, respectively. This month serves as a bridge between vibrant summer days and the cooler, cloudier seasons, providing a final burst of brightness before the year’s end. The seasonal shift becomes evident, yet September still invites outdoor adventures under its golden skies, making it a cherished time for locals and visitors alike.

Monthly Sunshine Duration in Rhondda: September Highlighted

The September sunshine duration represents the total number of hours Rhondda 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.
JanFebMarAprMayJunJulAugSepOctNovDec87h142h205h320h393h373h410h362h296h233h128h104h
Data source: Rhondda September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Rhondda During September

September in Rhondda, United Kingdom, offers a moderate chance of sunshine, with approximately 23% likelihood of clear skies. This slight dip from the summer months, where sunny days peak at 36% in July, reflects the transition toward autumn. As the vibrant hues of fall approach, the weather becomes less predictable, with September presenting a mix of lingering warm days and increasing cloud cover. Despite this decline in sunshine compared to earlier months, it remains a favorable time to enjoy the outdoors, showcasing the lush landscapes of Rhondda under the intermittently bright skies.

Percentage of Sunny Days in September in Rhondda

The chart illustrates the percentage of sunny days in Rhondda 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 Rhondda experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec18%19%25%51%28%25%36%25%23%17%27%17%
Data source: Rhondda September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Rhondda in September

As summer transitions into autumn, September in Rhondda showcases a gradual decrease in daylight, offering about 12 hours of sunlight—a gentle step down from the long, vibrant days of June and July, which enjoy the maximum of 16 hours. This month marks a significant shift from the peak summer days, reminding us of the seasonal cycle as daylight continues to shorten. Following September, the days dwindle to 10 hours in October, paving the way for the colder months ahead. It's a time when the landscape begins to shift, reflecting the enchanting hues of fall while encouraging us to savor the last warm rays before winter descends.

Average Daylight Hours in Rhondda for September

The chart illustrates the variation in daylight duration in Rhondda throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 22m9h 57m11h 55m13h 55m15h 40m16h 34m16h 5m14h 31m12h 35m10h 35m8h 48m7h 51m
Data source: Rhondda daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Rhondda

As summer fades into autumn, the September wind in Rhondda, United Kingdom, is characterized by a gentle breeze averaging 3.1 m/s (7 mph). This slight dip in wind speed continues a trend observed during the warmer months, where winds tend to be softer; July recorded the calmest winds at just 2.9 m/s (6 mph). Interestingly, September's winds follow a seasonal pattern, often more placid than the spring and early summer months, which boast higher averages. However, this tranquility heralds a shift, as the wind speeds begin to pick up again in October, reaching 4.4 m/s (10 mph). This transitional breeze serves as a reminder of the approaching autumn, making September a peaceful, yet fleeting moment before the gustier months arrive.

Average September Wind Speed in Rhondda

The chart displays monthly wind speed patterns in Rhondda, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.25.14.43.34.13.12.93.63.1 m/s4.43.64.7
Data source: Rhondda September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Rhondda Compares to Other Months

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

September and January present contrasting weather patterns in Rhondda. In September, temperatures range from a cool 2°C (36°F) at night to a warm 27°C (81°F) during the day, with an average of 13°C (56°F). The month experiences about 92 mm (3.6 in) of precipitation over 13 days, coupled with a humidity level of 79%. In stark contrast, January sees much colder temperatures, with lows dipping to -6°C (22°F) and a maximum of 13°C (55°F), averaging around 4°C (40°F). The precipitation is slightly less at 82 mm (3.2 in), occurring over 12 days, and humidity rises to 88%. For more details about January weather conditions, you can visit Rhondda weather in January.

September and February present distinctly different weather patterns. In September, temperatures range from a minimum of 2°C (36°F) to a maximum of 27°C (81°F), with an average of 13°C (56°F). This month experiences about 92 mm (3.6 inches) of precipitation over approximately 13 days, and the humidity sits at 79%. Conversely, February is considerably colder, with temperatures ranging from a minimum of -5°C (23°F) to a maximum of 16°C (60°F), averaging 5°C (42°F). Precipitation is higher in February, totaling 124 mm (4.9 inches) over 16 days, and the humidity reaches 88%. For more details, you can check Rhondda weather in February.

September and March present distinct weather patterns, showcasing the transition between summer and winter. In September, temperatures range from a minimum of 2°C (36°F) to a pleasant maximum of 27°C (81°F), with an average of 13°C (56°F) and relatively lower humidity at 79%. The month sees about 92 mm (3.6 in) of precipitation spread across approximately 13 days. In contrast, March experiences cooler conditions, starting from a minimum of -7°C (19°F), with an average of 6°C (43°F) and a maximum of 19°C (66°F). This month is also wetter, with 111 mm (4.4 in) of precipitation over about 17 days and higher humidity at 86%. For a more detailed comparison, you can check Rhondda weather in March.

In comparing the weather between September and April, notable differences emerge. September offers a more temperate climate with average temperatures ranging from 2°C to 27°C (36°F to 81°F), while April experiences chillier conditions, with temperatures between -4°C and 21°C (26°F to 70°F). Precipitation levels in September are higher at 92 mm (3.6 in) over 13 days, compared to April's 64 mm (2.5 in) across 10 days. Interestingly, humidity remains relatively high in both months, with September at 79% and April slightly higher at 84%. For a detailed look at weather conditions specific to April, you can visit Rhondda weather in April.

When comparing the weather in September and May, both months exhibit a mix of temperatures and precipitation, but with some distinct differences. In September, temperatures range from a low of 2°C (36°F) to a high of 27°C (81°F), averaging 13°C (56°F), while May exhibits slightly cooler temperatures with a minimum of -1°C (31°F) and a maximum of 25°C (77°F), averaging 11°C (52°F). Both months have similar levels of precipitation, around 92 mm (3.6 in) in September and 93 mm (3.7 in) in May, occurring over 13 days in each month. Humidity is also quite comparable, with September at 79% and May at 80%. For more detailed information on May weather, you can visit Rhondda weather in May.

When comparing the weather in September and June, we see notable similarities and differences. September experiences a broad temperature range, with minimums around 2°C (36°F), averaging 13°C (56°F), and maximums reaching 27°C (81°F). In contrast, June starts slightly warmer with minimum temperatures of 5°C (41°F), an average of 14°C (58°F), and maximums of 28°C (82°F). Both months have comparable precipitation levels, with September recording 92 mm (3.6 in) over 13 days and June showing 91 mm (3.6 in) across 15 days. Humidity is slightly higher in September at 79%, compared to June's 80%. For more details on June's weather specifically in the Rhondda area, visit Rhondda weather in June.

When comparing the weather in September and July, a few key differences emerge. September typically experiences a wider temperature range, with minimums dropping to 2°C (36°F) and maximums reaching 27°C (81°F), while July remains slightly warmer, with temperatures ranging from a minimum of 6°C (42°F) to a maximum of 28°C (82°F). Both months see similar levels of precipitation, averaging around 93 mm (3.7 in) over approximately 13 days, but September boasts a higher humidity level at 79% compared to July's 70%. Thus, while July offers warmer days, September presents a cooler climate with a touch more humidity. For a detailed look at July weather, you can consult Rhondda weather in July.

Comparing the weather in September to that of August reveals some notable differences. September generally features cooler minimum temperatures, with a low of 2°C compared to August's 5°C. The average temperature also dips slightly from 15°C in August to 13°C in September, despite September reaching a comparable maximum of 27°C. Additionally, while August experiences greater precipitation at 114 mm over 17 days, September sees 92 mm of rain over 13 days, indicating a slightly drier and cooler month. The humidity also rises in September to 79%, compared to 73% in August, making the atmosphere feel a bit more humid. For more detailed weather information, you can check Rhondda weather in August.

September's weather offers a gentler transition into fall, with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 27°C (81°F), and an average of 13°C (56°F). The month experiences considerable rainfall, totaling 92 mm (3.6 in) over about 13 days, while humidity hovers around 79%.

In contrast, October sees cooler temperatures with a minimum of -2°C (28°F) and a maximum of 21°C (70°F), leading to an average of 10°C (51°F). This month also brings increased precipitation, reaching 143 mm (5.6 in) over 15 days, and humidity rises to 89%. The shift from September to October marks a notable decrease in temperature and an uptick in both rainfall and humidity, creating a distinctly cooler and wetter atmosphere. For more detailed information, you can check Rhondda weather in October.

In September, the weather features milder temperatures, with a minimum of 2°C (36°F) and a maximum of 27°C (81°F), making it a more pleasant month overall, with an average temperature of 13°C (56°F). The precipitation is moderate at 92 mm (3.6 in) over 13 days, and humidity stands at 79%. In contrast, November ushers in much cooler temperatures, with a minimum of -3°C (26°F) and a maximum of 15°C (59°F), resulting in an average of 7°C (45°F). November is also wetter, receiving 117 mm (4.6 in) of rain across 16 days, along with increased humidity at 90%. For more detailed information, you can check out Rhondda weather in November.

September and December present contrasting weather patterns. In September, temperatures typically range from a mild 2°C (36°F) at night to a comfortable 27°C (81°F) during the day, with an average of 13°C (56°F). The month sees moderate precipitation, totaling 92 mm (3.6 in) over about 13 days, accompanied by a humidity level of 79%. In contrast, December experiences much cooler temperatures, with nighttime lows plummeting to -6°C (21°F) and daytime highs reaching only 12°C (54°F), averaging around 6°C (43°F). This month also brings increased rainfall, amounting to 144 mm (5.7 in) spread over 18 days, and higher humidity at 89%. For more details on December's weather in this region, check out Rhondda weather in December.

Compare Rhondda's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Rhondda

As September arrives in Rhondda, it brings a unique blend of weather that sets it apart from the summer months. Temperatures begin to cool, transitioning from the warmth of summer, with notable shifts from balmy days to crisp evenings. With an average of 79% humidity and 92 mm of precipitation across approximately 13 days, the month tends to feel more moist and changeable. While days may still reach a pleasant warmth, the risk of rain increases, hinting at the approaching autumn. This variability in weather not only enhances the landscape's beauty but also invites a refreshing change, making September a time of transformation in the Rhondda region. For more insights into how this month compares to others, check out Rhondda Climate.