September Weather in Henley-on-Thames, United Kingdom

Last updated: March 17, 2025

September in Henley-on-Thames, United Kingdom offers a delightful mix of summer warmth and autumnal chill, with temperatures ranging from a maximum of 28°C (83°F) to a refreshing minimum of 3°C (37°F). The month averages a pleasant 15°C (59°F), creating a comfortable environment for outdoor activities. While residents can expect some rainfall, with a total precipitation of 49 mm (1.9 in) over 9 days, the humidity level remains relatively high at 82%, adding a touch of softness to the crisp September air. This transitional month is perfect for enjoying the natural beauty and vibrant scenery that Henley has to offer.

September Temperature in Henley-on-Thames

As summer fades, September in Henley-on-Thames offers a delightful transition into autumn, featuring mild temperatures that range from a minimum of 3°C (37°F) to a maximum of 28°C (83°F). The average temperature settles comfortably at 15°C (59°F), making it an ideal time for outdoor activities amidst the beautiful fall foliage. Compared to the sweltering heat of July and August, which can peak at 35°C (96°F) and 33°C (92°F) respectively, September ushers in a breath of fresh air while still embracing the warmth of late summer. This month serves as a bridge, showcasing the gentle shift in climate as Henley prepares for the cooler months ahead.

September Weather in Henley-on-Thames: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Henley-on-Thames, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec414345495561656359534643
Data source: Temperature data for Henley-on-Thames 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 Henley-on-Thames

In September, Henley-on-Thames experiences a notable transition as the summer warmth begins to wane, marked by a precipitation amount of 49 mm (1.9 in) over the month, making it one of the drier periods compared to the more rain-soaked months that precede and follow it. This month sees about 9 days of rainfall, which is relatively moderate, reflecting a shift from the wetter conditions of August and hinting at the upcoming increase in precipitation typical of October, where amounts soar to 95 mm (3.7 in). The gradual decline in rainfall from June’s peak of 75 mm (2.9 in) to September suggests a seasonal transition, harmonizing outdoor activities with the crisp autumn air before more frequent rain returns. As the leaves begin to change, September offers a brief reprieve from the heavier downpours typical of the autumn months.

September Precipitation Trends in Henley-on-Thames

The chart displays monthly precipitation patterns in Henley-on-Thames, 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.
JanFebMarAprMayJunJulAugSepOctNovDec505259376875667049955583
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Henley-on-Thames

In September, Henley-on-Thames experiences a noticeable shift in humidity, with levels averaging around 82%. This marks an increase from the drier summer months of July and August, where humidity dipped to 71% and 76%, respectively. As autumn approaches, the air retains more moisture, creating a refreshing atmosphere that contrasts with the crispness of September's beginnings. This transition sets the stage for the return of higher humidity levels typical of the later months, where figures climb back up to 90% in October and maintain a steady 92% through the winter. Overall, September serves as a bridge, blending the warmth of summer with the moisture-laden air of autumn.

September Average Humidity in Henley-on-Thames

This chart illustrates the average monthly humidity levels in Henley-on-Thames, 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 Henley-on-Thames

As September unfolds in Henley-on-Thames, the UV Index remains at a high level of 6, suggesting that while the sun is less intense than in the height of summer, caution is still warranted. With a burn time of just 25 minutes, it's essential to protect your skin during peak hours. This trend reflects a gradual decline from August’s UV Index of 7 but still indicates a need for vigilance as the days shorten and temperatures begin to cool. As autumn approaches, residents and visitors alike should remain aware of their exposure to UV rays, especially when engaging in outdoor activities. For more information, check out the Henley-on-Thames UV Index for tips on safe sun exposure.

Maximum UV Index Levels in Henley-on-Thames for September

The chart shows the monthly maximum UV Index (UVI) for Henley-on-Thames 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: Henley-on-Thames 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 Henley-on-Thames

As summer gracefully transitions into autumn in Henley-on-Thames, September offers a delightful balance of warmth and brilliant sunshine, boasting 293 hours of sunshine hours. This month continues the pattern of vibrant summer months, though with slightly fewer sunlit hours compared to the preceding July and August, which peaked at 397 and 359 hours respectively. The trend reveals a gradual decline in daylight as the year progresses, from a bright May with its 388 hours to the crisper October sunlight of 237 hours. This delightful September serves as a gentle reminder of the fading summer, providing residents and visitors with a rich tapestry of golden days before the cooler months edge in.

Monthly Sunshine Duration in Henley-on-Thames: September Highlighted

The September sunshine duration represents the total number of hours Henley-on-Thames 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.
JanFebMarAprMayJunJulAugSepOctNovDec98h146h203h313h388h377h397h359h293h237h144h111h
Data source: Henley-on-Thames September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Henley-on-Thames During September

September in Henley-on-Thames offers a moderate chance of sunny weather, with a 27% likelihood of sunshine. As summer fades, the sun's presence starts to wane, marking a noticeable decline from the peaks of spring, where April boasts a striking 51% chance. The trend reveals that while early months like March show promising sunny intervals, the transition to autumn typically sees fluctuating probabilities. With the sun's retreat evident as temperatures cool, September strikes a balance, providing a few pleasant days that invite outdoor exploration before the chill of October sets in.

Percentage of Sunny Days in September in Henley-on-Thames

The chart illustrates the percentage of sunny days in Henley-on-Thames 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 Henley-on-Thames experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec20%24%28%51%32%26%36%23%27%25%31%17%
Data source: Henley-on-Thames September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Henley-on-Thames in September

As summer gently recedes, September in Henley-on-Thames marks a transition with approximately 12 hours of daylight. This decrease in sunlight follows the peak brightness of June and July, where the days stretched to an impressive 16 hours. Although September still enjoys more light than earlier months like April and March, the gradual loss hints at the impending arrival of autumn. The shift in daylight serves as a reminder of nature's cycles, where the days grow shorter and the cozy charm of fall beckons. As we embrace this change, the rich hues of early autumn begin to paint the landscape, inviting moments of contemplation and the anticipation of cozy evenings ahead.

Average Daylight Hours in Henley-on-Thames for September

The chart illustrates the variation in daylight duration in Henley-on-Thames throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 24m9h 58m11h 55m13h 54m15h 37m16h 31m16h 3m14h 29m12h 34m10h 36m8h 50m7h 54m
Data source: Henley-on-Thames daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Henley-on-Thames

As September breezes into Henley-on-Thames, the wind begins to whisper tales of change, with an average speed of 3.4 m/s (8 mph). This gentle gust reflects a gradual decrease from the summer's warmer months, where July and August maintained a steady 3.2 m/s and 3.7 m/s, respectively. Notably, September marks a transition, just as the vibrant colors of autumn start to paint the landscape. As the wind picks up again in the following months, particularly in October with 4.4 m/s (10 mph), the shifting patterns remind us of nature's rhythm, setting the stage for the cooler seasons ahead.

Average September Wind Speed in Henley-on-Thames

The chart displays monthly wind speed patterns in Henley-on-Thames, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.34.94.43.44.33.23.23.73.4 m/s4.43.94.5
Data source: Henley-on-Thames September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Henley-on-Thames Compares to Other Months

The weather in Henley-on-Thames 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 Henley-on-Thames and find detailed weather information for every month.

In September, temperatures in Henley-on-Thames range from a mild 3°C (37°F) at night to a warm 28°C (83°F) during the day, with an average of 15°C (59°F). The month experiences around 49 mm (1.9 in) of precipitation across 9 days, accompanied by humidity levels of 82%. In contrast, January brings much colder conditions, with minimum temperatures dropping to -4°C (25°F) and daytime highs peaking at 14°C (58°F), yielding an average of 5°C (41°F). Precipitation remains similar at 50 mm (2.0 in) over 9 days, but with a higher humidity level of 91%. For more insights, you can explore Henley-on-Thames weather in January.

September and February present contrasting weather patterns. In September, temperatures range from a mild 3°C (37°F) at night to a warm 28°C (83°F) during the day, with an average of 15°C (59°F). This month sees about 49 mm (1.9 in) of precipitation over roughly 9 days, accompanied by a humidity level of 82%. In contrast, February experiences colder temperatures, with nighttime lows dropping to -8°C (17°F) and daytime highs reaching 18°C (65°F), averaging around 6°C (43°F). Precipitation is slightly higher at 52 mm (2.0 in) across 10 days, with humidity peaking at 89%. For more detailed insights into February weather, you can explore Henley-on-Thames weather in February.

In comparing the weather between September and March, we see distinct seasonal contrasts. September generally boasts milder temperatures, with averages around 15°C (59°F) and a maximum of 28°C (83°F), making it a more pleasant month overall. In contrast, March experiences cooler temperatures, averaging only 7°C (45°F) and peaking at 22°C (71°F), alongside chilly minimums that can drop as low as -6°C (22°F). Both months see considerable precipitation, with March receiving slightly more at 59 mm (2.3 in) over 14 days compared to September’s 49 mm (1.9 in) across 9 days. Humidity is also notably higher in March at 86%, compared to September’s 82%. For more details on the weather specifics during this time, visit Henley-on-Thames weather in March.

September and April present contrasting weather patterns. In September, temperatures range from a minimum of 3°C (37°F) to a maximum of 28°C (83°F), with an average of 15°C (59°F) and relatively high humidity at 82%. The month also receives about 49 mm (1.9 in) of precipitation over 9 days. In comparison, April experiences cooler temperatures, with a minimum of -3°C (27°F) and a maximum of 26°C (79°F), averaging 9°C (49°F). Precipitation is slightly less at 36 mm (1.4 in), occurring over 8 days, and humidity is marginally higher at 85%. For more details, check out Henley-on-Thames weather in April.

September and May showcase distinct weather patterns, reflecting the transition from summer to autumn. In September, temperatures range from a cool 3°C (37°F) at night to a warm 28°C (83°F) during the day, with an average of around 15°C (59°F). However, it also experiences a relatively lower humidity of 82% and less precipitation at 49 mm (1.9 in) over 9 days. In contrast, May starts with cooler mornings at 0°C (33°F) and peaks at 26°C (78°F), averaging 13°C (55°F). This month tends to be slightly wetter, with 68 mm (2.7 in) of rain over 11 days, yet with a marginally lower humidity of 79%. For a more detailed look at May's climate, check out Henley-on-Thames weather in May.

When comparing the weather in September and June, we see some interesting differences. September tends to have slightly cooler temperatures, with a minimum of 3°C (37°F) and an average of 15°C (59°F), while June starts off warmer with a minimum of 6°C (44°F) and an average of 16°C (61°F). The maximum temperatures also reflect this trend, with September hitting a high of 28°C (83°F) compared to June's 31°C (88°F). In terms of precipitation, June receives more rainfall, totaling 75 mm (2.9 in) over 10 days, while September sees less at 49 mm (1.9 in) over 9 days. Humidity levels are similar, with September at 82% and June slightly lower at 80%. For a more detailed look, you can check the Henley-on-Thames weather in June.

When comparing the weather in September and July, we see significant differences in temperature and humidity. September experiences cooler temperatures, with a minimum of 3°C (37°F) and an average of 15°C (59°F), while July is notably warmer, with a minimum of 7°C (46°F) and an average of 18°C (65°F). July also boasts higher maximum temperatures, reaching up to 35°C (96°F) compared to September's peak of 28°C (83°F). Additionally, July has more rainfall, with 66 mm (2.6 in) over 12 days, whereas September sees less precipitation at 49 mm (1.9 in) over 9 days. The humidity reflects these changes as well, with September being more humid at 82% compared to July's 71%. For more detailed insights on July weather, you can visit Henley-on-Thames weather in July.

In comparing the weather of September to that of August, September provides a noticeable drop in temperatures, with a minimum of 3°C (37°F) compared to August's minimum of 7°C (45°F). The average temperature in September is about 15°C (59°F), while August sees a warmer average of 17°C (63°F), peaking at a maximum of 28°C (83°F) in September versus 33°C (92°F) in August. While August experiences slightly more precipitation at 70 mm (2.8 in) over 12 days, September's precipitation totals 49 mm (1.9 in) across 9 days, indicating a trend towards drier weather. Additionally, humidity levels are higher in September at 82% compared to August's 76%. For a closer look at August weather specifics, visit Henley-on-Thames weather in August.

In comparing the weather of September and October, we see a notable shift towards cooler and wetter conditions. September experiences a more moderate temperature range with minimums around 3°C (37°F) and maximums reaching up to 28°C (83°F), averaging 15°C (59°F). It sees relatively less precipitation at 49 mm (1.9 in) over 9 days, with humidity at 82%. In contrast, October brings cooler minimums dropping to 0°C (33°F) and average temperatures declining to 11°C (53°F), with maximums capping at 23°C (73°F). This month is also wetter, with total precipitation rising to 95 mm (3.7 in) across 13 days and humidity increasing to 90%.

For more detailed weather insights, you can check Henley-on-Thames weather in October.

September and November exhibit distinct differences in weather patterns. September, with its mild average temperature of 15°C (59°F) and a maximum of 28°C (83°F), offers a warm transition from summer, while November cools down significantly, averaging just 8°C (46°F) and reaching a maximum of 16°C (62°F). Additionally, September experiences less precipitation at 49 mm (1.9 in) over 9 days, compared to November's slightly higher 55 mm (2.2 in) spread over 12 days. Humidity levels also rise from September’s 82% to November’s 92%, indicating a shift towards a more damp atmosphere. For more specific insights on the weather during this time, check out Henley-on-Thames weather in November.

The weather in September is generally milder compared to December, with temperatures ranging from a minimum of 3°C (37°F) to a maximum of 28°C (83°F) and an average of 15°C (59°F). In September, the area experiences about 49 mm (1.9 in) of precipitation over 9 rainy days, accompanied by relatively lower humidity at 82%. In contrast, December brings colder conditions with temperatures dropping as low as -4°C (24°F) and averaging 6°C (43°F), peaking at a maximum of 14°C (58°F). Additionally, December sees increased precipitation of 83 mm (3.3 in) spread over 14 days, along with higher humidity levels of 92%. For a detailed look at December weather in Henley-on-Thames, you can check out Henley-on-Thames weather in December.

Compare Henley-on-Thames's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Henley-on-Thames

As September unfolds in Henley-on-Thames, it serves as a transitional bridge between the warmth of summer and the briskness of autumn. With temperatures fluctuating significantly—from warm highs to chilly lows—this month showcases a remarkable average climate that tempts both outdoor enthusiasts and cozy interior seekers alike. While rainfall is present on about a third of the days, the overall precipitation is relatively modest, making for an enjoyable experience amidst lush scenery. The elevated humidity levels may hint at summer's lingering influence, but the crisp air eventually signals the arrival of fall. For more insights into the weather trends throughout the year, explore Henley-on-Thames Climate.