September Weather in Amersham, United Kingdom

Last updated: March 17, 2025

Experience the September weather in Amersham, United Kingdom, where temperatures range from a pleasant minimum of 3°C (38°F) to a comfortable maximum of 28°C (83°F). With an average temperature of 15°C (59°F), this month offers a blend of warmth and crispness. September brings about 51 mm (2.0 in) of rainfall over 10 days, leading to a moisture-rich atmosphere with humidity levels reaching 82%. It's a perfect time to enjoy the transition of seasons in this picturesque town!

September Temperature in Amersham

As September arrives in Amersham, United Kingdom, the temperatures begin to transition from the warmth of summer to the cooler embrace of autumn. With minimums dipping to 3°C (38°F) and average highs reaching a pleasant 28°C (83°F), this month offers a delightful blend of warm days and crisp evenings. The average temperature sits at a comfortable 15°C (59°F), striking a balance that invites both outdoor adventures and cozy nights alike. Compared to the peak summer months, September provides a gentle cooldown, showcasing the charm of the season as leaves start to change. With fewer extremes than the blistering days of July and August, this transitional month is perfect for enjoying the scenic beauty of Amersham as it gears up for fall.

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

The chart illustrates September temperature patterns in Amersham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec404245495561656359534643
Data source: Temperature data for Amersham 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 Amersham

In September, Amersham experiences a moderate precipitation amount of 51 mm (2.0 in), typical for the month as summer transitions into autumn. Rainfall occurs over approximately 10 days, mirroring the frequency of precipitation seen in earlier months like January and June. While September's rainfall is slightly lower than the preceding months of August and July, it maintains a consistent pattern within the annual cycle. This steady precipitation not only nourishes the lush greenery of the region but also hints at the more substantial rainfall expected as the year progresses into October, when averages soar to 91 mm (3.6 in). As the seasons shift, residents can anticipate a refreshing change, marked by crisp air and an ever-changing landscape.

September Precipitation Trends in Amersham

The chart displays monthly precipitation patterns in Amersham, 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.
JanFebMarAprMayJunJulAugSepOctNovDec565257346674677151915483
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Amersham

As September rolls in, Amersham experiences a notable shift in humidity, with levels averaging 82%. This marks a slight rise from the drier summer months of July and August, where humidity dipped to 71% and 76%, respectively. The transition into autumn brings back the moisture, hinting at the typical British weather patterns that are characterized by an increase in humidity as the seasons change. This gradual uptick is consistent with the overall trend observed throughout the year, where the highest humidity peaks occur in the winter months of January and February, soaring to 91% and 89%. September's moderate humidity creates a comfortable atmosphere, bridging the gap between the warmth of summer and the chill of autumn.

September Average Humidity in Amersham

This chart illustrates the average monthly humidity levels in Amersham, 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 Amersham

As summer gives way to autumn, the UV Index in Amersham remains notably high in September, peaking at 6—considered a high exposure category. This indicates that while the intensity of UV radiation is tapering off from the summer months of July and August, it’s still potent enough to warrant caution, with a burn time of just 25 minutes. The trend seen throughout the year highlights a gradual increase in UV intensity from the low levels in winter, peaking in the summer months, before starting to decrease again in the fall. With September marking this transition, it serves as a reminder to stay protected even as the weather cools. For more details, visit Amersham UV Index.

Maximum UV Index Levels in Amersham for September

The chart shows the monthly maximum UV Index (UVI) for Amersham 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: Amersham 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 Amersham

As summer gently transitions into autumn, September in Amersham shines with an impressive 300 hours of sunshine. This significant daylight continues the steady decline from the sun-drenched heights of July, which boasts 404 hours, while still marking a stark contrast to the subdued sunlight of winter months like November and December. The gradual decrease is part of a larger trend where spring and summer months bask in abundant sunshine, peaking in May and July. Yet, September manages to retain a delightful brightness, making it a charming time to enjoy the beauty of Amersham as nature begins to unveil its stunning autumn hues. As daylight dwindles into the upcoming months, September serves as a brilliant farewell to the prolonged summer days.

Monthly Sunshine Duration in Amersham: September Highlighted

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

Chance of Sun in Amersham During September

In Amersham, the likelihood of sunny weather in September stands at 28%, reflecting a slight increase compared to the summer months but remaining lower than the more promising spring bloom of April at 49%. As the seasons transition, September does offer a blend of warmth from summer and the crispness of autumn, making it a month where sunny days are cherished yet uncertain. This trend highlights a consistent pattern, with September typically yielding more sun than August's 23%, but still trailing behind the promising sun of the early spring months, suggesting that while sunny spells are possible, they are far from guaranteed as the year winds down toward winter.

Percentage of Sunny Days in September in Amersham

The chart illustrates the percentage of sunny days in Amersham 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 Amersham experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec21%25%27%49%31%26%38%23%28%24%32%17%
Data source: Amersham September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Amersham in September

As the summer warmth begins to wane, September in Amersham offers a comfortable transition with an average of 12 hours of daylight. This month marks a noticeable decline from the sun-drenched glory of 16 hours in June and July but still shines brighter than the darker months to come. Typical of autumn's arrival, daylight hours have dipped from August's 14 hours, hinting at the gradual approach of winter's shorter days. While September's light lingers longer than the deeper shades of October and November, it also reflects nature's rhythm, ushering in a season of change and beauty as the leaves begin to turn.

Average Daylight Hours in Amersham for September

The chart illustrates the variation in daylight duration in Amersham 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 54m15h 39m16h 34m16h 4m14h 30m12h 35m10h 36m8h 49m7h 52m
Data source: Amersham daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Amersham

As September unfolds in Amersham, the wind starts to transition subtly from the summer breezes, averaging a gentle 3.4 m/s (8 mph). This marks a slight decline from August's 3.9 m/s (9 mph), reflecting the seasonal shift as autumn begins to take hold. Compared to earlier months, September’s winds are comparable to the spring's calmer April, which recorded an average of 3.5 m/s (8 mph). This pattern suggests that while the summer warmth lingers, the winds are tempering in anticipation of the cooler months ahead, setting a serene backdrop for the picturesque scenery of Amersham. As we move into October, a slight uptick in wind speed to 4.5 m/s (10 mph) is expected, hinting at the return of brisk autumnal gusts that are characteristic of the season.

Average September Wind Speed in Amersham

The chart displays monthly wind speed patterns in Amersham, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.34.94.53.54.33.33.33.93.4 m/s4.54.04.6
Data source: Amersham September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Amersham Compares to Other Months

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

September and January display striking contrasts in weather patterns. September offers a milder climate with average temperatures ranging from a minimum of 3°C (38°F) to a maximum of 28°C (83°F), making it a pleasant month with an average of 15°C (59°F). The precipitation levels are moderate at 51 mm (2.0 in) across about 10 days, accompanied by a humidity level of 82%.

In contrast, January brings significantly colder temperatures, with a minimum of -5°C (23°F) and a maximum of 14°C (58°F), resulting in an average temperature of just 5°C (41°F). Despite a slightly higher precipitation level of 56 mm (2.2 in) over the same number of days, January tends to be more humid, with humidity reaching 91%. This stark difference emphasizes the transition from the warmth of late summer to the chill of mid-winter. For more about the weather specifics in January, you can visit Amersham weather in January.

September and February present quite different weather experiences. In September, temperatures can range from a mild 15°C (59°F) on average, peaking at 28°C (83°F) during the warmest parts of the day, while nights can dip to a cooler 3°C (38°F). The precipitation is relatively light, at 51 mm over about 10 days, and humidity is comfortably high at 82%.

Conversely, February sees much cooler conditions, with average temperatures around 6°C (43°F) and a maximum of only 18°C (65°F), dipping as low as -5°C (22°F) at night. The month experiences similar rainfall, measuring 52 mm over approximately 11 days, but the humidity is slightly higher at 89%. For an in-depth look at February's weather, you can visit Amersham weather in February.

When comparing September and March weather, noticeable differences emerge. September typically boasts mild temperatures, with a minimum of 3°C (38°F) and an average of 15°C (59°F), peaking at a comfortable 28°C (83°F). In contrast, March experiences cooler temperatures, starting at a minimum of -6°C (22°F) and averaging around 7°C (45°F), while the maximum temperature reaches 22°C (71°F). Additionally, March tends to be wetter, with 57 mm (2.2 in) of precipitation over 14 days, compared to September's 51 mm (2.0 in) over 10 days. Humidity levels are slightly higher in March at 86%, versus September's 82%. For more detailed insights, you can visit Amersham weather in March.

September and April present distinct weather patterns, showcasing the transition between seasons. In September, temperatures range from a cool 3°C (38°F) at night to a warm average of 15°C (59°F) and can peak at 28°C (83°F) during the day. The month also experiences more precipitation, totaling 51 mm (2.0 in) over about 10 days, with humidity levels around 82%. In contrast, April tends to be cooler, with minimum temperatures dropping to -2°C (28°F), an average of 9°C (49°F), and a maximum of 27°C (80°F). Precipitation is lighter, at 34 mm (1.3 in) over approximately 8 days, accompanied by slightly higher humidity at 85%. For a more detailed look at the weather conditions in April, you can visit Amersham weather in April.

In comparing the weather between September and May, September tends to be slightly warmer, with average temperatures ranging from a minimum of 3°C (38°F) to a maximum of 28°C (83°F), compared to May's range of 1°C (34°F) to 26°C (79°F). While both months experience a decent amount of precipitation, September sees 51 mm (2.0 in) of rainfall over about 10 days, whereas May has slightly higher precipitation at 66 mm (2.6 in) over 11 days. Additionally, humidity levels are fairly similar, with September at 82% and May at 79%. For more details, you can check Amersham weather in May.

In comparing the weather between September and June, we observe notable differences. September experiences a cooler temperature range, with a minimum of 3°C (38°F) and a maximum of 28°C (83°F), averaging around 15°C (59°F). In contrast, June tends to be warmer, featuring a minimum of 7°C (44°F) and a maximum of 31°C (89°F), with an average temperature of 16°C (61°F). Both months share a similar number of rainy days at 10, but June has a higher total precipitation at 74 mm (2.9 in) compared to September’s 51 mm (2.0 in). Humidity levels are also slightly higher in September at 82%, compared to June’s 80%. For a detailed look at June’s weather patterns, you can refer to Amersham weather in June.

In comparing September and July, we see noticeable differences in temperature and humidity. September experiences cooler temperatures, ranging from a minimum of 3°C (38°F) to a maximum of 28°C (83°F), with an average of 15°C (59°F). In contrast, July boasts significantly warmer temperatures, with a minimum of 8°C (47°F) and a maximum reaching up to 36°C (97°F), and an average of 18°C (65°F). Additionally, September has higher humidity at 82% compared to July's 71%. While both months experience precipitation, July has more rain, totaling 67 mm (2.6 in) over 13 days, compared to September's 51 mm (2.0 in) over 10 days. For more details on July weather, you can visit Amersham weather in July.

In comparison to August, September experiences cooler temperatures, with a minimum of 3°C (38°F) and a maximum of 28°C (83°F), contrasted with August's minimum of 8°C (46°F) and a maximum of 34°C (93°F). The average temperature in September is 15°C (59°F), slightly lower than August's average of 17°C (64°F). Additionally, September sees less precipitation, with 51 mm (2.0 in) over 10 days, compared to August's 71 mm (2.8 in) over 13 days. Humidity levels are also higher in September at 82%, compared to August's 76%. For more detailed information, you can check Amersham weather in August.

In September, the weather is quite warm with temperatures ranging from a minimum of 3°C (38°F) to a maximum of 28°C (83°F), resulting in an average temperature of 15°C (59°F). This month experiences moderate rainfall, with a total of 51 mm (2.0 in) over approximately 10 days and a humidity level of 82%.

In contrast, October brings cooler temperatures, starting with a minimum of 1°C (34°F) and averaging 11°C (53°F) up to a maximum of 22°C (73°F). Precipitation increases to 91 mm (3.6 in) spread over 13 days, coupled with higher humidity at 90%. This shift highlights the transition into fall, making October a noticeably wetter and cooler month compared to September. For more specific details about the weather, visit Amersham weather in October.

September and November present contrasting weather patterns. September typically enjoys milder temperatures, with a minimum of 3°C (38°F) and an average of 15°C (59°F), reaching a maximum of 28°C (83°F). The month sees about 51 mm (2.0 in) of precipitation over an average of 10 days, accompanied by a humidity level of 82%. In contrast, November ushers in colder weather, featuring a minimum temperature of -2°C (29°F) and an average of 8°C (46°F), peaking at 16°C (62°F). This month experiences slightly more precipitation at 54 mm (2.1 in) over 11 days, with humidity rising to 92%. For more detailed information, you can visit Amersham weather in November.

September and December showcase a notable contrast in weather patterns. September typically experiences milder temperatures, ranging from a minimum of 3°C (38°F) to a maximum of 28°C (83°F), with an average of 15°C (59°F). This month sees moderate rainfall, with about 51 mm (2.0 in) of precipitation over approximately 10 days and a humidity level of 82%. In contrast, December ushers in much colder conditions, with temperatures dipping as low as -5°C (23°F) and averaging around 6°C (43°F), peaking at 14°C (58°F). Rainfall increases to 83 mm (3.3 in) spread across about 14 days, accompanied by higher humidity levels at 92%. For a closer look at specific conditions, you can check Amersham weather in December.

Compare Amersham's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Amersham

As September rolls in, Amersham experiences a distinct transition from the summer's warmth to the crispness of autumn. With an average temperature of 15°C, the month showcases a delightful mix of milder days and cooler nights, offering a refreshing change from the summer heat. While the occasional 28°C day might still pop up, the frequency of rainfall increases, with precipitation observed on about 10 days and a total of 51 mm contributing to the lush scenery. The humidity remains relatively high at 82%, often making the air feel a bit muggy, especially after rain. Overall, September's weather marks a gentle shift, setting the stage for the vibrant colors of fall ahead. For more insights into the climate, visit Amersham Climate.