September Weather in Guildford, United Kingdom

Last updated: March 17, 2025

In September, Guildford, United Kingdom experiences a dynamic range of weather, showcasing a maximum temperature peaking at 28°C (83°F), while the average hovers around 15°C (59°F). As the month progresses, temperatures can drop to a minimum of 3°C (37°F), reflecting the transition into autumn. With 44 mm (1.7 in) of rainfall spread across 8 days, residents can expect some wet spells, enhancing the verdant charm of the area. The humidity level remains relatively high at 82%, contributing to the refreshing, crisp air typical of early fall in this picturesque town.

September Temperature in Guildford

As September arrives in Guildford, the summer warmth begins to wane, giving way to a more temperate climate. With minimum temperatures hovering around 3°C (37°F) and an average of 15°C (59°F), the month showcases a delightful transition from the heat of summer. Daytime highs can still reach a pleasant 28°C (83°F), perfect for outdoor adventures, yet the cool evenings hint at the approaching autumn. This period marks a sweet spot where the lingering warmth meets crisp air, inviting locals and visitors to relish the change in seasons while enjoying all that Guildford has to offer.

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

The chart illustrates September temperature patterns in Guildford, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec414345495562656359534644
Data source: Temperature data for Guildford 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 Guildford

September in Guildford, United Kingdom, typically sees a moderate amount of precipitation, with an average of 44 mm (1.7 in) falling over approximately 8 days. This marks a decrease from the wetter summer months, as August recorded 70 mm (2.8 in) and June peaked at 77 mm (3.0 in). As the year progresses into autumn, September transitions into a drier spell, notably lighter than the subsequent month of October, which averages 88 mm (3.5 in). This overall trend indicates a shift from the lush greenery of summer toward the more unpredictable rains of early fall, capturing the essence of the changing seasons in this picturesque region.

September Precipitation Trends in Guildford

The chart displays monthly precipitation patterns in Guildford, 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.
JanFebMarAprMayJunJulAugSepOctNovDec515357356577677044885686
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Guildford

In September, humidity in Guildford, United Kingdom, settles at 82%, marking a noticeable rise as summer transitions into autumn. Following the lower levels of 71% in July and 76% in August, September's humidity indicates a gradual return to the more humid conditions typical of the earlier months in the year. This upward trend suggests that while the sweltering heat of summer fades, the air retains a hint of moisture, reminiscent of the lush greenery that defines the region. As autumn approaches, this humidity sets the stage for the cooler months, where figures escalate further, peaking in winter at 90% in October and reaching 92% by December. Overall, September's humidity reflects a balance between lingering warmth and the impending chill, creating a perfect backdrop for the seasonal transition.

September Average Humidity in Guildford

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

In September, Guildford sees a UV Index of 6, placing it in the high exposure category with a burn time of just 25 minutes. This marks a slight drop from the intense levels of August where the index peaked at 7, indicating the summer sun's gradual retreat. As autumn approaches, the UV Index starts to diminish from its summer highs, yet remains significant enough that sun protection is still a necessity during outdoor activities. Notably, this trend reflects a consistent pattern in Guildford where the late summer months bring heightened UV risks that warrant vigilance. For more details on how to stay safe, check out the Guildford UV Index.

Maximum UV Index Levels in Guildford for September

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

As the summer fades, September in Guildford gracefully transitions into autumn, offering a delightful 309 hours of sunshine. This month marks a significant change from the sun-drenched peak of July, which boasted 408 hours, but still outshines the earlier months of the year. The continued warmth lingers from the vibrant summer, creating a perfect backdrop for leisurely strolls and outdoor activities. Following a remarkable high in May with 405 hours of sunlight, September's totals reflect a typical early autumn pattern—sunshine dwindles while golden leaves begin to emerge. With a noticeable dip leading into October at 244 hours, September stands as a sweet farewell to summer's warmth, setting the stage for cozy, crisp days ahead.

Monthly Sunshine Duration in Guildford: September Highlighted

The September sunshine duration represents the total number of hours Guildford 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.
JanFebMarAprMayJunJulAugSepOctNovDec99h148h209h326h405h396h408h375h309h244h149h112h
Data source: Guildford September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Guildford During September

In Guildford, September brings a moderate 29% chance of sunny weather, placing it among the more favorable months as summer wanes. This figure reflects a slight dip from the peak sunshine seen in April, but is notably higher than the sun-soaked days of January and February. While the month struggles with less sun compared to mid-summer, it remains a pleasant time for outdoor activities, especially when juxtaposed with the gloomier prospects of October. The trend suggests that while September may not boast the highest likelihood of sunshine, it certainly holds its own in the early autumn landscape, inviting residents and visitors alike to seize the opportunities for enjoying the lingering warmth of the season.

Percentage of Sunny Days in September in Guildford

The chart illustrates the percentage of sunny days in Guildford 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 Guildford experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec20%25%33%52%35%28%38%26%29%26%33%19%
Data source: Guildford September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Guildford in September

As summer transitions into autumn, September in Guildford, United Kingdom, brings a noticeable shift in daylight, offering around 12 hours of sunlight. This marks a gentle decline from the peak of 16 hours enjoyed in June and July, reflecting the gradual retreat of the longer days of summer. The early weeks of September still retain a hint of summer warmth, allowing for extended outdoor activities, but as the month progresses, daylight wanes toward the shorter days of October, which provide just 10 hours of daylight. This pattern underscores the rhythm of the seasons, where each month contributes to a captivating dance of light as nature prepares for the quieter, darker months ahead.

Average Daylight Hours in Guildford for September

The chart illustrates the variation in daylight duration in Guildford throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 26m9h 59m11h 55m13h 53m15h 36m16h 29m16h 1m14h 28m12h 34m10h 37m8h 52m7h 56m
Data source: Guildford daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Guildford

As September rolls into Guildford, the average wind speed gently settles at 3.3 m/s (7 mph), marking one of the calmer months of the year. This slight decrease from the summer months reflects a transition to the more stable and soothing breezes of autumn. With the winds softening from August's 3.8 m/s (8 mph), September paints a serene landscape, inviting locals and visitors alike to enjoy the vibrant fall foliage without the distraction of blustery gusts. Interestingly, as autumn progresses, we anticipate a gradual uptick in wind speeds leading into October, suggesting that while September offers a moment of tranquility, the lively winds of the coming months are just around the corner.

Average September Wind Speed in Guildford

The chart displays monthly wind speed patterns in Guildford, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.34.94.53.54.43.13.43.83.3 m/s4.43.74.4
Data source: Guildford September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Guildford Compares to Other Months

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

In September, the weather is generally milder, 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). The month sees about 44 mm (1.7 in) of precipitation over eight days, coupled with a humidity level of 82%. Conversely, January experiences much colder conditions, with temperatures dropping to a minimum of -5°C (23°F) and peaking at 14°C (58°F), producing an average of 5°C (41°F). Rainfall increases slightly to 50 mm (2.0 in) over ten days, and humidity rises to 91%. For a detailed look at the January weather, visit Guildford weather in January.

When comparing the weather in September and February, it's clear that September enjoys a milder climate, with average temperatures ranging from a chilly 3°C (37°F) at night to a pleasant 28°C (83°F) during the day. This month sees less precipitation, averaging 44 mm (1.7 in) over about 8 days, and a relative humidity of 82%. In contrast, February is significantly colder, with temperatures dipping as low as -7°C (19°F) at night, peaking at a maximum of 18°C (64°F) during the day. It experiences slightly more rainfall, averaging 53 mm (2.1 in) over 11 days, along with a higher humidity level of 89%. For more details on February weather, you can check Guildford weather in February.

September and March present contrasting weather patterns as the seasons transition. 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 15°C (59°F). The month typically sees moderate precipitation of 44 mm (1.7 in) spread across about 8 days and a relative humidity of 82%. Conversely, March embodies the tail end of winter, with colder nights averaging a low of -6°C (21°F) and daytime highs reaching up to 21°C (71°F), culminating in an average temperature of 7°C (46°F). This month experiences slightly more rainfall at 57 mm (2.2 in) over approximately 13 days, along with a higher humidity level of 86%. For more specific insights into the weather patterns during this month, you can check Guildford weather in March.

In comparing the weather of September and April, September tends to be warmer, with average temperatures ranging from a minimum of 3°C (37°F) to a maximum of 28°C (83°F), contrasted with April's cooler temperatures that range from a minimum of -3°C (27°F) to a maximum of 25°C (78°F). While September experiences slightly more precipitation at 44 mm (1.7 in) over 8 days, April sees a bit less at 35 mm (1.4 in) over just 7 days. Additionally, April has a higher humidity level at 85%, compared to September's 82%. For a more detailed look at what to expect, you can explore Guildford weather in April.

In comparing the weather between September and May, we see some distinct differences. September boasts warmer temperatures, with a minimum of 3°C (37°F) and an average high of 28°C (83°F), while May's temperatures range from a cooler minimum of 1°C (34°F) and an average high of 26°C (79°F). When it comes to precipitation, May tends to be wetter, receiving 65 mm (2.6 in) over 10 days compared to September's 44 mm (1.7 in) over 8 days. However, September has a slightly higher humidity level at 82%, while May sits at 79%. For a detailed look at May weather, you can visit Guildford weather in May.

In September, temperatures typically 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). The month experiences around 44 mm (1.7 in) of precipitation over 8 days and maintains a humidity level of 82%. In contrast, June features milder temperatures, with a minimum of 7°C (45°F) and a maximum of 31°C (88°F), averaging 16°C (62°F). Rainfall is more substantial in June, totaling 77 mm (3.0 in) across 9 days, and the humidity is fairly consistent at 80%. For more detailed information, you can check Guildford weather in June.

In comparing the weather of September and July, September tends to be cooler overall, with average temperatures ranging from a minimum of 3°C (37°F) to a maximum of 28°C (83°F), while July is warmer, showcasing temperatures that range from 8°C (47°F) to a high of 35°C (95°F). Precipitation also varies between the two months; September receives 44 mm (1.7 in) of rain over 8 days, whereas July sees a higher total of 67 mm (2.6 in) across 11 days. Additionally, humidity levels in September are notably higher at 82%, compared to July's 71%. For more detailed information on July's weather in Guildford, visit Guildford weather in July.

In comparing the weather of September and August, we observe notable differences in temperature and precipitation patterns. September tends to be cooler, with minimum temperatures dropping to 3°C (37°F) and maximums reaching 28°C (83°F), averaging a comfortable 15°C (59°F). In contrast, August is warmer, featuring minimums of 8°C (46°F) and maximums soaring to 33°C (91°F), while the average temperature sits at 17°C (64°F). Moreover, September experiences less precipitation, totaling 44 mm (1.7 in) over 8 rainy days, compared to August's 70 mm (2.8 in) spread across 11 days. Interestingly, September also has a higher average humidity of 82%, while August maintains a slightly lower level at 76%. For more detailed information, refer to Guildford weather in August.

In September, temperatures in Guildford range from a minimum of 3°C (37°F) to a maximum of 28°C (83°F), featuring an average of 15°C (59°F). The month experiences about 44 mm (1.7 in) of precipitation over 8 days, with a humidity level around 82%. In contrast, October brings cooler weather, with temperatures dropping to a minimum of 0°C (33°F) and an average temperature of 12°C (54°F), peaking at 23°C (73°F). Rainfall increases significantly to 88 mm (3.5 in) over 13 days, and humidity rises to 90%. For a detailed look at October's weather, check out Guildford weather in October.

September and November present contrasting weather patterns, reflecting the transition from late summer to late autumn. In September, temperatures are generally milder, with averages around 15°C (59°F) and highs reaching up to 28°C (83°F), while November sees a significant drop with average temperatures of just 8°C (47°F) and maximums of 16°C (62°F). Precipitation increases from September's 44 mm (1.7 in) over 8 days to 56 mm (2.2 in) across 12 days in November, contributing to a higher humidity level of 92% compared to September's 82%. These shifts highlight the cooler, wetter conditions of late fall, as detailed further at Guildford weather in November.

September weather showcases a wide range of temperatures, with averages around 15°C (59°F) and highs reaching up to 28°C (83°F). This month typically experiences 44 mm (1.7 in) of precipitation over about 8 days, combined with a relatively high humidity of 82%. In contrast, December offers much cooler conditions, featuring a minimum temperature of -4°C (26°F) and an average of just 6°C (44°F), with highs capped at 15°C (58°F). The month is also wetter, with 85 mm (3.4 in) of rain spread over 14 days, and humidity levels climbing to 92%. For more detailed information on December weather, visit Guildford weather in December.

Compare Guildford's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Guildford

As September rolls in, Guildford transitions from the warm embrace of summer to the refreshing cooler days of autumn. While the month can still boast some pleasantly warm days, with temperatures peaking at 28°C, it is marked by a noticeable shift towards cooler evenings, often dipping to about 3°C. The increase in humidity, holding steady at around 82%, complements the occasional showers, contributing to a total precipitation of 44 mm over approximately 8 days. This blend of warmth and moisture fosters a unique charm in September, setting it apart from the drier, hotter months of summer. For a deeper understanding of what weather to expect throughout the year, visit Guildford Climate.