September Weather in Farnborough, United Kingdom

Last updated: March 17, 2025

Farnborough, United Kingdom, experiences a dynamic September, where temperatures range from a refreshing 2°C (37°F) at night to a warm 28°C (83°F) during the day, with an average of 15°C (59°F). This transitional month sees a notable humidity level of 82%, creating a crisp yet comfortable atmosphere. However, precipitation is a frequent visitor, accumulating to 50 mm (2.0 in) over approximately 9 days, offering a reminder of the changing seasons. Whether basking in the sun or experiencing drizzles, September in Farnborough serves as a beautiful blend of summer warmth and autumnal charm.

September Temperature in Farnborough

As September arrives in Farnborough, the temperatures begin to reflect the transition from summer warmth to autumn coolness. With overnight lows dipping to 2°C (37°F), there's a noticeable shift from the milder nights of August. However, the average temperature holds steady at a comfortable 15°C (59°F), offering pleasant afternoons ideal for outdoor activities. The daytime highs can still reach up to 28°C (83°F), reminiscent of summer's lingering embrace, but as the month progresses, you can expect the crispness of fall to subtly hint at the season ahead. This blend of warmth and coolness makes September a unique and inviting time to experience Farnborough's natural beauty.

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

The chart illustrates September temperature patterns in Farnborough, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec414345495461646358524643
Data source: Temperature data for Farnborough 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 Farnborough

In September, Farnborough experiences a noticeable shift in precipitation patterns, mirroring the transitional nature of the season. With an average rainfall of 50 mm (2.0 in) over 9 days, the month stands out as one of the drier periods compared to the summer months of July and August, which see consistently higher totals. This decline in precipitation is accompanied by a slight increase in dry days, suggesting a more moderate and stable weather pattern as autumn approaches. In fact, as September wraps up, the town transitions into the wetter months ahead, with October bringing a significant increase in both rainfall to 97 mm (3.8 in) and rainy days, hinting at the onset of deeper autumnal weather. This gentle decrease in September’s rainfall serves as a refreshing prelude to the richer, rainier days that follow.

September Precipitation Trends in Farnborough

The chart displays monthly precipitation patterns in Farnborough, 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.
JanFebMarAprMayJunJulAugSepOctNovDec505360386975637150975684
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Farnborough

September in Farnborough marks a notable shift in humidity as summer gives way to autumn. With an average humidity level of 82%, the month reflects a gentle increase following the warmer, drier months of July and August, which recorded 71% and 76% respectively. This rise indicates a transition to cooler, more humid conditions, typical of the impending fall. As the year progresses into October, humidity is set to climb again, peaking at 90%. Overall, September serves as a bridge between the lower summer humidity and the higher levels found in the late fall and winter months, inviting residents to prepare for the dampness that characterizes the UK’s autumn weather.

September Average Humidity in Farnborough

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

As September rolls in Farnborough, the UV Index settles at a high level of 6, indicating that while the sun is still quite strong, it’s a slight dip from the peak summer intensity. This month’s burn time is about 25 minutes, so it’s essential to stay vigilant about sun protection, especially during midday hours. This trend reflects a gradual decrease in UV exposure as the year progresses; from a scorching UV Index of 8 in July, the shift to September shows that while the sun remains powerful, it’s more manageable than in the height of summer. As we transition into autumn, keeping an eye on local UV conditions will help ensure safe outdoor experiences. For more details on UV levels throughout the year, visit Farnborough UV Index.

Maximum UV Index Levels in Farnborough for September

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

As summer gently fades into autumn, September in Farnborough offers a delightful transition with 293 hours of sunshine. While this marks a noticeable decline from the sun-drenched heights of the summer months, including 397 hours in July and 359 hours in August, it still serves as a charming chapter in the yearly tale of sunshine. This softer light invites residents and visitors alike to savor the onset of fall, making it an ideal time for outdoor activities amid the changing leaves. As the days gradually shorten, September remains a cherished bridge between the vibrant summer and the introspective days of October, which brings 237 hours of sunlight.

Monthly Sunshine Duration in Farnborough: September Highlighted

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

Chance of Sun in Farnborough During September

As summer transitions to autumn, September in Farnborough, United Kingdom, offers a moderate chance of sunny weather, with approximately 26% likelihood of sunshine. While this figure remains relatively stable compared to the summer months, it signifies a gradual decline from the peak sunshine of April at 52%. The month features a slight dip in sunny days as Farnborough moves from the vibrant summer months, yet it still enjoys more sunlight than the chillier months ahead, maintaining a comfort for those looking to savor the last hints of summer warmth before the autumn chill sets in. Overall, September strikes a balance between lingering summer vibes and the approach of cooler days, making it a unique time for outdoor activities.

Percentage of Sunny Days in September in Farnborough

The chart illustrates the percentage of sunny days in Farnborough 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 Farnborough experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec21%24%27%52%32%26%36%23%26%25%31%17%
Data source: Farnborough September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Farnborough in September

As summer gives way to autumn, September in Farnborough, United Kingdom, offers a gentle decline in daylight, with around 12 hours of sunshine per day. This month marks a noticeable transition from the long, sun-drenched days of July and August, which basked in 16 and 14 hours of light, respectively. With daylight hours steadily decreasing, September serves as a reminder of the approaching winter, yet still provides ample opportunity to enjoy outdoor activities amidst the vibrant fall colors. The gradual reduction in daylight from the peak of June also sets the stage for a cozy shift towards the shorter, darker days of October, which brings just 10 hours of light.

Average Daylight Hours in Farnborough for September

The chart illustrates the variation in daylight duration in Farnborough 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 2m14h 29m12h 34m10h 36m8h 51m7h 54m
Data source: Farnborough daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Farnborough

As summer fades and autumn approaches, September in Farnborough features a gentle average wind speed of 3.5 m/s (8 mph). This slight dip in wind intensity follows the more lively summer months, where winds hovered around 3.2 to 3.8 m/s. While September’s breeze marks a transition, it’s still comparatively calm, setting the stage for October’s return to brisker winds at 4.5 m/s. This pattern of moderated winds throughout early autumn creates a serene atmosphere, perfect for leisurely walks in the crisp air, allowing residents and visitors to embrace the shifting seasons.

Average September Wind Speed in Farnborough

The chart displays monthly wind speed patterns in Farnborough, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.45.14.53.44.33.23.23.83.5 m/s4.53.94.6
Data source: Farnborough September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Farnborough Compares to Other Months

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

September and January present contrasting weather patterns. September enjoys a mild average temperature of 15°C (59°F) with maximums reaching up to 28°C (83°F), while January is typically colder, with an average of 5°C (41°F) and maximums only peaking at 14°C (58°F). The humidity in September is a comfortable 82%, whereas January's humidity is slightly higher at 91%. Both months receive the same amount of precipitation, around 50 mm (2.0 in), over roughly the same number of days—9 days of rain. For more details on January weather, you can visit Farnborough weather in January.

September and February present contrasting weather conditions, with September experiencing a broader temperature range, from a minimum of 2°C (37°F) to a maximum of 28°C (83°F) and an average of 15°C (59°F). Humidity levels are relatively high at 82%, with precipitation totaling 50 mm (2.0 in) across about 9 days. In contrast, February is colder, with temperatures ranging from a minimum of -8°C (17°F) to a maximum of 18°C (64°F) and an average of 6°C (43°F). The month sees slightly higher precipitation at 53 mm (2.1 in) over 11 days, along with a marginally higher humidity of 89%. For more detailed information, you can check Farnborough weather in February.

September and March showcase contrasting weather patterns, reflective of their respective positions within the seasonal calendar. In September, temperatures range from a mild 2°C (37°F) at night to a warm average of 15°C (59°F) during the day, peaking at 28°C (83°F). The month sees about 50 mm (2.0 in) of precipitation over roughly 9 days, coupled with an average humidity of 82%. In contrast, March experiences colder conditions, with nighttime lows dipping to -6°C (22°F) and an average temperature of 7°C (45°F), climbing to a maximum of 21°C (71°F). Precipitation increases slightly to 59 mm (2.3 in) over about 13 days, with humidity also higher at 86%. For more detailed insights into March weather, check out Farnborough weather in March.

September typically offers warmer temperatures compared to April, with averages around 15°C (59°F) and highs reaching 28°C (83°F), while April's averages are cooler at 9°C (49°F) with a maximum of 26°C (78°F). Precipitation levels in September are slightly higher at 50 mm (2.0 in) over 9 days, compared to April's 38 mm (1.5 in) over 8 days. Both months experience relatively high humidity levels, with September at 82% and April slightly higher at 85%. For more detailed information, check out Farnborough weather in April.

When comparing the weather in September and May, September generally offers warmer temperatures, ranging from a minimum of 2°C (37°F) to a maximum of 28°C (83°F), with an average of 15°C (59°F). In contrast, May features slightly cooler temperatures, with a minimum of 0°C (33°F) and a maximum of 25°C (78°F), averaging 12°C (55°F). Precipitation is more frequent in May, totaling 69 mm (2.7 in) over 11 days, compared to September's 50 mm (2.0 in) across 9 days. Humidity levels are also comparable, at 82% in September and 79% in May, making both months feel relatively moist. For more detailed insights, you can visit Farnborough weather in May.

When comparing the weather in September and June, we see that September typically experiences milder temperatures with minimums around 2°C and average highs reaching 28°C, while June has slightly warmer conditions with minimums of 6°C and maximums peaking at 31°C. Both months feature a similar level of humidity, with September at 82% and June at 80%. However, June tends to have more precipitation, averaging 75 mm over 11 days compared to September's 50 mm over 9 days. For more details, you can check Farnborough weather in June.

In comparing the weather between September and July, it's evident that July tends to be warmer overall, with average temperatures reaching 18°C (65°F) compared to September's 15°C (59°F). July also experiences higher maximum temperatures, peaking at 35°C (95°F) versus September's maximum of 28°C (83°F). However, September is cooler in terms of minimum temperatures, starting at a low of 2°C (37°F), while July's minimum is 7°C (45°F). Both months see significant humidity levels, with September at 82% and July at 71%. Precipitation is also notable; July has 63 mm (2.5 in) over 12 days, while September receives slightly less at 50 mm (2.0 in) across 9 days. For a detailed overview of July weather, check out Farnborough weather in July.

In September, the weather is noticeably cooler than in August, with minimum temperatures dropping to 2°C (37°F) compared to August's 7°C (45°F). The average temperature also sees a decline, averaging 15°C (59°F) in September versus 17°C (63°F) in August, while maximum temperatures reach only 28°C (83°F) compared to August's peak of 34°C (93°F). Additionally, September experiences slightly less precipitation, totaling 50 mm (2.0 in) over 9 days, while August has higher precipitation at 71 mm (2.8 in) over 12 days. Humidity levels remain relatively high in both months, but September's 82% is a bit higher than August's 76%. For more details, you can explore Farnborough weather in August.

In September, the weather begins to transition from summer, with temperatures ranging from a cool 2°C (37°F) at night to a warm 28°C (83°F) during the day, and an average of 15°C (59°F). The month experiences relatively moderate precipitation amounting to 50 mm (2.0 in) over about 9 days, alongside a humidity level of 82%. In contrast, October ushers in a cooler climate, where temperatures dip further, showing a minimum of 0°C (33°F) and a maximum of 23°C (73°F), averaging around 11°C (53°F). This month is wetter, with rainfall reaching 97 mm (3.8 in) over 12 days and humidity increasing to 90%. For more details on October weather, you can visit Farnborough weather in October.

September typically offers a warmer climate compared to November, with average temperatures ranging from a mild 15°C (59°F) to a high of 28°C (83°F). In contrast, November sees cooler temperatures, averaging around 8°C (46°F), with a maximum of only 16°C (61°F) and even dipping to -2°C (28°F) at night. Additionally, September experiences slightly less precipitation, totaling 50 mm (2.0 in) over about 9 days, while November has a bit more rainfall at 56 mm (2.2 in) across 12 days. The humidity also rises in November, reaching 92%, compared to September's 82%. For more detailed information, you can check out Farnborough weather in November.

September and December present quite different weather conditions. In September, temperatures range from a minimum of 2°C (37°F) to a maximum of 28°C (83°F), with an average of 15°C (59°F). This month typically experiences 50 mm (2.0 in) of precipitation spread over about 9 days, with humidity levels around 82%. In contrast, December sees colder temperatures, with minimums dropping to -3°C (26°F) and maximums only reaching 14°C (57°F), averaging at 6°C (43°F). Notably, December is wetter, with 84 mm (3.3 in) of precipitation over approximately 14 days and higher humidity at 92%. For more detailed insights, check out Farnborough weather in December.

Compare Farnborough's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Farnborough

As September settles in, Farnborough experiences a distinct shift in weather compared to the warmth of summer months, offering a more moderate atmosphere with cooler evenings and mild days. The maximum temperatures hover around a comfortable 28°C (83°F), but the average drops to a brisk 15°C (59°F), creating an inviting transition into autumn. However, this month also brings its share of rainy days, contributing to the overall 82% humidity that envelops the region, making for a refreshing yet sometimes damp experience. For a deeper dive into the unique climate characteristics of Farnborough, explore more at Farnborough Climate.