September Weather in Richmond, United Kingdom

Last updated: March 17, 2025

September in Richmond, United Kingdom, brings a delightful mix of warm and cool temperatures, with daily highs reaching up to 28°C (83°F) and an average of 15°C (59°F). As the month progresses, residents can expect cooler nights, with lows dipping to 4°C (39°F). Rainfall is moderate, accumulating to around 45 mm (1.8 in) over 10 days, contributing to the area's lush greenery. Humidity levels hover at a comfortable 82%, making for a refreshing atmosphere perfect for enjoying the early autumn scenery.

September Temperature in Richmond

As summer wanes and autumn approaches, September in Richmond, United Kingdom, unveils a delightful transition in temperatures. With a minimum of 4°C (39°F) and a respectable average of 15°C (59°F), the month starts to hint at the cooler days ahead. The contrast is evident as temperatures can rise to a pleasant maximum of 28°C (83°F), providing a final taste of warmth before autumn truly settles in. This month gracefully balances the lingering warmth of summer and the crispness of autumn, making it a perfect time for outdoor activities amid the changing foliage. Overall, September captures the essence of seasonal change, offering a charming mix of warmth and coolness.

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

The chart illustrates September temperature patterns in Richmond, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec414345495562656459534643
Data source: Temperature data for Richmond 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 Richmond

In September, Richmond experiences a moderate precipitation level of 45 mm (1.8 in), a slight dip from the wetter summer months. With rain falling on 10 days, this marks a balanced transition as the region shifts towards autumn. While not the driest month of the year, September's rainfall is lighter than August and July, suggesting a gradual tapering off of summer showers. This seasonal shift is accompanied by a slight decrease in rainfall frequency, setting the stage for the wetter months ahead, particularly as October approaches with its average of 84 mm (3.3 in) of rain. Overall, September serves as a gentle reminder of the changing seasons, where lighter rains pave the way for the more substantial downpours to come.

September Precipitation Trends in Richmond

The chart displays monthly precipitation patterns in Richmond, 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.
JanFebMarAprMayJunJulAugSepOctNovDec545354336277647045845284
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Richmond

As summer transitions to autumn, September in Richmond, United Kingdom brings a noticeable shift in humidity levels. With an average humidity of 82%, September maintains a slightly elevated moisture level compared to the drier summer months, which saw July at 71% and August at 76%. This increase hints at the approaching chill of fall, as the humidity begins to rise again, foreshadowing the higher levels characteristic of October, which hits 90%. Overall, this month serves as a bridge, showcasing the last remnants of warm air mingling with the cool, wet conditions that will define the upcoming season.

September Average Humidity in Richmond

This chart illustrates the average monthly humidity levels in Richmond, 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.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%86%85%79%81%71%76%82%91%92%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Richmond

As September rolls in, Richmond, United Kingdom experiences a high UV Index of 6, indicating that sun exposure can lead to overexposure in just 25 minutes. This month typically sees a transition from the summer's intense sun, where the UV Index peaked at 8 in July and June, to more moderate levels, yet care is still essential. The high exposure category means that while the days are shortening and the temperatures begin to dip, residents and visitors should remain vigilant about sun safety. Taking precautions to shield yourself from harmful UV rays is still necessary as you enjoy the autumn scenery. For more detailed insights, check out Richmond UV Index.

Maximum UV Index Levels in Richmond for September

The chart shows the monthly maximum UV Index (UVI) for Richmond 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.
JanFebMarAprMayJunJulAugSepOctNovDec124578876421
Data source: Richmond 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 Richmond

As summer transitions into autumn, September in Richmond, United Kingdom, shines with a generous 300 hours of sunlight, making it one of the sunniest months of the year. This final taste of summer is a delightful contrast to the waning hours seen in the earlier months, notably July at 404 hours and May at 398 hours. While September's light diminishes when compared to the peak summer days, it still significantly outshines the gloom of the winter months, like January with just 98 hours. This steady decline from July through September highlights a gradual shift in the seasons, where the warmth of summer lingers just a bit longer, inviting residents to embrace the outdoors before the chill sets in.

Monthly Sunshine Duration in Richmond: September Highlighted

The September sunshine duration represents the total number of hours Richmond 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.
JanFebMarAprMayJunJulAugSepOctNovDec98h148h210h319h398h389h404h368h300h241h144h109h
Data source: Richmond September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Richmond During September

As summer fades into autumn, the likelihood of sunny weather in September in Richmond, United Kingdom, holds steady at 29%. This modest chance reflects a trend where the probability of sunshine typically begins to dip after the peak of spring and summer months. Compared to the sunnier days of April, with its 49% likelihood, September's sunshine chances mirror those seen in March and even dip below the vibrancy of May. Despite this decline, September often offers a pleasant balance, making it a delightful time to enjoy the outdoors before the chill of autumn fully sets in.

Percentage of Sunny Days in September in Richmond

The chart illustrates the percentage of sunny days in Richmond 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 Richmond experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec19%25%29%49%33%28%38%25%29%25%32%17%
Data source: Richmond September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Richmond in September

As September arrives in Richmond, United Kingdom, the daylight hours begin their gentle decline, with the sun gracing the skies for approximately 12 hours each day. This marks a transition from the sun-drenched days of summer, where June and July basked in an impressive 16 hours of daylight, to the softer, autumnal light of fall. In contrast to the lengthy glow of May and June, when daylight peaks at 15 hours, September introduces a more tempered rhythm, hinting at the shorter days ahead. As the vibrant hues of summer fade into the warmth of autumn, residents can also anticipate October's swift drop to 10 hours of daylight, setting the stage for cozy evenings and the beauty of the changing seasons.

Average Daylight Hours in Richmond for September

The chart illustrates the variation in daylight duration in Richmond throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 23m9h 58m11h 55m13h 54m15h 38m16h 32m16h 3m14h 30m12h 35m10h 36m8h 50m7h 53m
Data source: Richmond daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Richmond

As September sets in Richmond, the winds begin to calm, with an average speed of 3.3 m/s (7 mph), reflecting a trend from the breezier summer months. This gentle breeze transitions the city into the embrace of autumn, reminiscent of the more lively winds seen earlier in the year, such as the 4.7 m/s (11 mph) gusts of February. Throughout the warmer months, wind speeds hovered between 3.1 and 4.7 m/s, but as the air cools, September marks a slight dip in intensity, mirroring the slowdown observed in August. As we approach October, Richmond begins to prepare for more robust winds, which will rise to 4.4 m/s (10 mph), reintroducing the briskness that often accompanies the change of seasons. The shifting wind patterns encapsulate the evolving spirit of Richmond, blending the warmth of summer with the crisp anticipation of autumn.

Average September Wind Speed in Richmond

The chart displays monthly wind speed patterns in Richmond, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.24.74.43.54.23.13.33.83.3 m/s4.43.84.4
Data source: Richmond September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Richmond Compares to Other Months

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

September and January present stark contrasts in weather patterns. In September, temperatures range from a mild 4°C (39°F) at night to a comfortable 28°C (83°F) during the day, with an average of 15°C (59°F). The month typically sees around 45 mm (1.8 in) of precipitation over 10 days, accompanied by a humidity level of 82%. In contrast, January experiences colder conditions, with temperatures dropping as low as -5°C (24°F) at night, peaking at 14°C (58°F) during the day and averaging 5°C (41°F). Precipitation increases slightly to 54 mm (2.1 in), also spread over 10 days, and humidity levels rise to 91%. This shift highlights the transition from the warmth of early autumn to the chill of mid-winter. For a deeper look into January weather specifics, check out Richmond weather in January.

September and February present notably different weather patterns, with September typically enjoying milder temperatures. In September, the temperature ranges from a minimum of 4°C (39°F) to a maximum of 28°C (83°F) with an average of 15°C (59°F). It experiences around 45 mm (1.8 in) of precipitation over 10 days, alongside a relatively lower humidity of 82%. In contrast, February is much cooler, with temperatures ranging from a minimum of -5°C (23°F) to a maximum of 18°C (65°F), and an average temperature of 6°C (43°F). February sees slightly higher precipitation at 53 mm (2.1 in) over 11 days and a higher humidity level of 89%. For more detailed insights into February weather, you can refer to Richmond weather in February.

In September, the weather tends to be warmer, with average temperatures around 15°C (59°F) and maximum highs reaching 28°C (83°F). The month experiences about 45 mm (1.8 in) of precipitation over roughly 10 days, with humidity averaging 82%. In contrast, March sees cooler temperatures, starting from a minimum of -5°C (23°F) and averaging around 7°C (46°F), peaking at 22°C (71°F). Precipitation increases slightly to 54 mm (2.1 in) over 13 days, and humidity is a bit higher at 86%. For more detailed information about the weather patterns in March, you can check this link: Richmond weather in March.

In September, the weather is generally warmer with average temperatures ranging from a minimum of 4°C (39°F) to a maximum of 28°C (83°F) and an average of 15°C (59°F). The month sees about 45 mm (1.8 in) of precipitation over approximately 10 days, with humidity levels at 82%. In contrast, April experiences cooler conditions with temperatures varying from a minimum of -2°C (29°F) to a maximum of 26°C (80°F) and an average of 10°C (49°F). April also has less precipitation, accumulating about 33 mm (1.3 in) over 8 days, accompanied by slightly higher humidity at 85%. For a detailed look at April's climate, visit Richmond weather in April.

September generally offers warmer temperatures compared to May, with average highs reaching 28°C (83°F) versus May's 25°C (78°F). However, the nights in September can still be quite cool, with minimum temperatures around 4°C (39°F), while May sees slightly cooler lows of 1°C (35°F). Both months experience a similar level of humidity, with September at 82% and May slightly lower at 79%. Precipitation is more frequent in May, with 62 mm (2.5 in) recorded over 11 days compared to September’s 45 mm (1.8 in) over 10 days. For more specifics on May weather, check out Richmond weather in May.

When comparing the weather in September to that of June, several notable differences emerge. September typically experiences slightly cooler temperatures, with a minimum of 4°C (39°F) and a maximum of 28°C (83°F), while June boasts warmer averages, ranging from a minimum of 7°C (45°F) to a maximum of 31°C (89°F). Although June has a higher average precipitation of 77 mm (3.0 in) over 9 days, September presents a lesser total of 45 mm (1.8 in) spread across 10 days. Humidity levels are quite similar, with September at 82% and June at 80%. For more details on June's weather specifics, you can refer to Richmond weather in June.

When comparing the weather in September to July, notable differences emerge in temperature and precipitation levels. In September, temperatures range from a minimum of 4°C (39°F) to a maximum of 28°C (83°F), with an average of 15°C (59°F). In contrast, July experiences warmer conditions, with a minimum of 9°C (49°F) and a maximum of 36°C (96°F), averaging 18°C (65°F). While September sees 45 mm (1.8 in) of precipitation over 10 days, July receives more rainfall at 64 mm (2.5 in) across 11 days, but with lower humidity at 71% compared to September's 82%. For more detailed information, you can refer to Richmond weather in July.

The weather in September shows a notable shift from August, with cooler temperatures and a broader range. September's minimum temperature drops to 4°C (39°F) compared to August's milder 8°C (47°F), while its maximum reaches 28°C (83°F), significantly lower than August's peak of 34°C (93°F). Additionally, September experiences slightly less precipitation at 45 mm (1.8 in) over 10 days, compared to August's 70 mm (2.7 in) over 12 days. The humidity in September also increases to 82%, slightly higher than August's 76%. For more detailed insights on August weather, visit Richmond weather in August.

In comparing the weather between September and October, September generally presents milder temperatures, with minimums around 4°C (39°F), average highs of 28°C (83°F), and a total precipitation of 45 mm (1.8 in) spread over about 10 days. In contrast, October brings cooler conditions, seeing minimum temperatures drop to 1°C (34°F) and an average high of 22°C (73°F). Additionally, October experiences increased rainfall, with 84 mm (3.3 in) of precipitation across 12 days, and a rise in humidity to 90%. For more detailed insights into October weather, visit Richmond weather in October.

September weather in Richmond offers a milder experience, with temperatures ranging from a minimum of 4°C (39°F) to a comfortable maximum of 28°C (83°F), and an average of 15°C (59°F). It's a relatively dry month, with 45 mm (1.8 in) of precipitation over about 10 days, and humidity levels at 82%. In contrast, November brings cooler temperatures, with a minimum of -2°C (29°F) and a maximum of 16°C (62°F), averaging around 8°C (47°F). The month sees slightly more precipitation at 52 mm (2.0 in) across 11 days, accompanied by higher humidity levels of 92%. For a detailed look at November weather, check Richmond weather in November.

In September, temperatures can vary significantly, ranging from a cool 4°C (39°F) at night to a warm 28°C (83°F) during the day, with an average of 15°C (59°F). The month typically sees around 45 mm (1.8 in) of precipitation over about 10 days, accompanied by humidity levels at 82%. In contrast, December brings a chillier climate, with minimum temperatures dropping to -4°C (24°F) and daily highs peaking at just 14°C (58°F), averaging around 6°C (44°F). Precipitation increases to 84 mm (3.3 in) across approximately 13 days, and humidity rises to 92%. For more details on December conditions, you can visit Richmond weather in December.

Compare Richmond's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Richmond

As September rolls in, Richmond experiences a delightful transition from the warmth of summer to the crispness of autumn. While the average temperature provides a comfortable embrace, the maximum highs still flirt with summer-like warmth, creating a perfect blend for outdoor activities. Contrasting with the drier summer months, September sees increased precipitation, with noticeable rainfall on about a third of the days, contributing to the lush scenery that characterizes the onset of fall. The humidity remains high, ensuring that the air is rich and invigorating. For detailed insights on Richmond's climate trends and how September fits into the yearly pattern, check out Richmond Climate.