September Weather in Colchester, United Kingdom

Last updated: March 17, 2025

In Colchester, United Kingdom, September brings a delightful transition into autumn, characterized by a maximum temperature of 24°C (76°F), providing warm days for outdoor activities. The average temperature settles at a moderate 15°C (60°F), while the minimum dips to a cool 6°C (42°F) at night. Rainfall is moderate, with a total precipitation of 58 mm (2.3 in) spread across 11 days, contributing to an 80% humidity level. This month offers a charming blend of sunny spells and occasional showers, making it an ideal time to enjoy the rich tapestry of Colchester's landscapes.

September Temperature in Colchester

As September unfolds in Colchester, temperatures begin to exhibit a gentle transition from summer warmth to autumn coolness. The month typically sees a minimum of around 6°C (42°F) and an average of 15°C (60°F), peaking at a comfortable 24°C (76°F). This pleasant climate offers a last glimpse of summer before the chill of October sets in. Compared to the sizzling highs of July and August, September brings a refreshing relief while still holding onto the warmth of the preceding months, creating an ideal backdrop for outdoor activities and harvest festivities. As the days gradually shorten, the inviting temperatures make it a delightful time to explore the beauty of Colchester's landscapes.

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

The chart illustrates September temperature patterns in Colchester, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec414345485461646460544743
Data source: Temperature data for Colchester generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Colchester

September in Colchester brings a transitional taste of autumn, with average precipitation measuring 58 mm (2.3 in) across approximately 11 days of rainfall. This month typically experiences a slight dip in rainfall compared to the wetter summer months of July (68 mm) and August (78 mm), yet it precedes the much wetter October, which averages a notable 90 mm. Such patterns underscore a gradual shift in weather as the region prepares for the more substantial downpours characteristic of fall. The balance of moisture during September helps nurture the vibrant foliage that begins to emerge as summer fades, making it a crucial period for the local environment.

September Precipitation Trends in Colchester

The chart displays monthly precipitation patterns in Colchester, 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.
JanFebMarAprMayJunJulAugSepOctNovDec576155276168687858905397
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Colchester

In September, Colchester experiences a noticeable shift in humidity levels, with the average dropping to 80%. This marks a continuation of the gradual decrease seen throughout the summer months, where humidity dipped to its lowest in August at 73%. Despite this reduction, September's humidity remains relatively high, signaling the lingering warmth of late summer before the cooler autumn air settles in. As the year progresses, humidity levels begin to rise again, peaking in the colder months of October through December, underscoring the region's distinct seasonal patterns. This transition not only reflects changes in temperature but also hints at the vibrant fall weather that characterizes Colchester during this time of year.

September Average Humidity in Colchester

This chart illustrates the average monthly humidity levels in Colchester, 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%82%81%76%73%80%89%92%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Colchester

As September arrives in Colchester, the UV Index settles at a moderate level of 5, signaling a shift from the high summer readings. This month, residents and visitors can expect a burn time of around 30 minutes when unprotected, making it essential to enjoy the outdoors responsibly. Compared to the very high levels of 8 seen in June and July, September offers a more manageable sun exposure, although caution is still advised. With its pleasant weather, this month serves as a gentle reminder of the changing seasons while still encouraging mindful sun safety practices. For more information on UV levels throughout the year, visit Colchester UV Index.

Maximum UV Index Levels in Colchester for September

The chart shows the monthly maximum UV Index (UVI) for Colchester 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.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Colchester 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 Colchester

As summer's warmth gently begins to fade, September in Colchester offers a delightful transition, boasting an impressive 310 hours of sunshine. This month reflects a slight decline from the peak of summer, yet it maintains a vibrant glow compared to the preceding months. After basking in 410 hours of sunshine in May and nearly equivalent sunshine in July, September still holds its charm, captivating residents with its golden hues. The gradual tapering of sunlight leads into the cooler months, with October seeing a further drop to 245 hours. This trend underscores how Colchester's weather dances between the vibrant days of summer and the serene onset of autumn, making September a truly enchanting time of year.

Monthly Sunshine Duration in Colchester: September Highlighted

The September sunshine duration represents the total number of hours Colchester 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.
JanFebMarAprMayJunJulAugSepOctNovDec94h149h224h336h410h402h411h388h310h245h153h108h
Data source: Colchester September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Colchester During September

In September, Colchester experiences a 32% chance of sunny weather, maintaining a steady trend observed during the previous summer months. While this figure mirrors the probabilities seen in August, it stands in contrast to the more optimistic sunniness of late spring, such as April's 47% chance. This indicates a gradual transition toward autumn, where brighter days become a bit less frequent. However, September still offers a pleasant opportunity for sunshine lovers, as its likelihood of clear skies is notably higher than the dreary winter months, especially when compared to January's mere 21% chance. As autumn approaches, enthusiasts of the outdoors can still relish the beauty of early fall in Colchester, making the most of its relatively bright days.

Percentage of Sunny Days in September in Colchester

The chart illustrates the percentage of sunny days in Colchester 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 Colchester experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec22%24%32%47%34%30%38%32%32%24%30%17%
Data source: Colchester September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Colchester in September

As summer fades and autumn begins to settle in Colchester, September brings a transition with 12 hours of daylight. This marks a gentle decline from the sun-drenched 16 hours experienced in June and July, tapering down to the softer light of early autumn. The month strikes a compelling balance, with still ample daylight for outdoor activities, yet hints at the quiet onset of shorter days ahead, as it takes a step down from August's 14 hours. As we move towards the cooler months, September serves as a reminder of the fading warmth while providing a last taste of summer's lingering brightness before the shorter days of October take hold.

Average Daylight Hours in Colchester for September

The chart illustrates the variation in daylight duration in Colchester throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 20m9h 56m11h 55m13h 55m15h 41m16h 36m16h 6m14h 32m12h 35m10h 35m8h 47m7h 50m
Data source: Colchester daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Colchester

As September unfolds in Colchester, the average wind speed gently eases to 4.2 m/s (9 mph), marking a noticeable decline from the summer months. This tranquil breeze contrasts with the more robust gusts felt earlier in the year, with July and August showing higher speeds at 4.3 m/s (10 mph) and 4.8 m/s (11 mph), respectively. The transition into autumn signals a shift, as the wind picks up again in October with a brisk 5.6 m/s (12 mph), hinting at the invigorating gusts that typically characterize the cooler season. While September’s winds may seem softer, they create a serene backdrop as the landscape transforms, inviting residents and visitors alike to enjoy the subtle beauty of this time of year.

Average September Wind Speed in Colchester

The chart displays monthly wind speed patterns in Colchester, 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.
JanFebMarAprMayJunJulAugSepOctNovDec5.45.75.24.35.03.84.34.84.2 m/s5.64.95.3
Data source: Colchester September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Colchester Compares to Other Months

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

In September, temperatures in Colchester range from a minimum of 6°C (42°F) to a maximum of 24°C (76°F), with an average of 15°C (60°F). The weather is generally mild and pleasant, accompanied by 58 mm (2.3 in) of precipitation spread over 11 days and humidity around 80%. In contrast, January sees much colder temperatures, with a minimum of -2°C (28°F) and a maximum of 13°C (56°F), averaging just 5°C (41°F). Although precipitation levels are similar at 57 mm (2.2 in) over 11 days, January is characterized by higher humidity at 91%. For more detailed insights, visit Colchester weather in January.

September weather tends to be milder, with average temperatures ranging from a minimum of 6°C (42°F) to a maximum of 24°C (76°F), resulting in a pleasant average of 15°C (60°F). It experiences relatively moderate precipitation of 58 mm (2.3 in) over 11 days and lower humidity at around 80%. In contrast, February presents a much chillier climate, with temperatures dipping as low as -4°C (25°F) and peaking at 14°C (58°F), leading to an average temperature of just 6°C (43°F). The month sees similar precipitation levels at 61 mm (2.4 in) and slightly higher humidity, reaching 89%. For a more detailed look at what to expect, you can visit Colchester weather in February.

In comparing the weather of September and March, it is evident that September boasts warmer temperatures, with average highs of 24°C (76°F) compared to March's maximum of 18°C (64°F). While September experiences a pleasant average temperature of 15°C (60°F) and relatively drier conditions, with 58 mm of precipitation over 11 days, March tends to be cooler, with an average of only 7°C (45°F) and similar precipitation levels at 55 mm but over an additional day. Humidity is slightly higher in March at 86% compared to 80% in September, contributing to a more brisk feel during the earlier spring month. For more detailed weather information specific to March, you can check Colchester weather in March.

When comparing the weather in September and April, notable differences emerge in temperature and precipitation levels. September generally enjoys milder conditions with an average temperature of 15°C (60°F), peaking at 24°C (76°F), while April has a cooler average of 9°C (48°F) with a maximum of 22°C (71°F). In terms of precipitation, September experiences more rain, totaling 58 mm (2.3 in) over 11 days, compared to April's lighter 27 mm (1.1 in) over just 6 days. Additionally, humidity levels are slightly higher in April at 85%, compared to September's 80%. For more details about April weather, you can visit Colchester weather in April.

September and May exhibit some notable differences in weather patterns. September enjoys slightly warmer temperatures, with an average of 15°C (60°F) and a maximum of 24°C (76°F), while May's average temperature is lower at 12°C (54°F), peaking at 22°C (73°F). Both months experience similar levels of precipitation, with September receiving 58 mm (2.3 in) and May just slightly more at 61 mm (2.4 in), occurring over the same number of days—11. Humidity levels remain fairly high in both months, with September at 80% and May at 82%. For more detailed information, you can check out Colchester weather in May.

September and June present a transition in weather, with both months experiencing mild temperatures and high humidity levels. In September, the average temperature ranges from a minimum of 6°C (42°F) to a maximum of 24°C (76°F), while June has slightly warmer averages, ranging from 6°C (43°F) to 26°C (79°F). Although both months see similar humidity levels, September is slightly cooler overall and receives a bit less precipitation at 58 mm (2.3 in) over 11 days compared to June's 68 mm (2.7 in) spread over 10 days. For more detailed information, you can check Colchester weather in June.

In comparing the weather between September and July, we see notable differences in temperatures and precipitation. September features cooler temperatures, with a minimum of 6°C (42°F) and an average of 15°C (60°F), compared to July's warmer minimum of 11°C (51°F) and an average of 18°C (65°F). July reaches higher maximum temperatures, peaking at 30°C (86°F), while September tops out at 24°C (76°F). Both months experience precipitation, but July has slightly more with 68 mm (2.7 in) over 13 days, compared to September's 58 mm (2.3 in) over 11 days. Additionally, September's humidity is higher at 80% versus July's 76%. For more detailed information on July weather, visit Colchester weather in July.

In comparing the weather of September and August, we see a notable shift in temperature and humidity levels. September features cooler temperatures, with a minimum of 6°C (42°F) and an average of 15°C (60°F), while August maintains milder conditions with a minimum of 10°C (49°F) and an average of 18°C (65°F). Additionally, August boasts warmer maximum temperatures, reaching up to 29°C (84°F), compared to September's maximum of 24°C (76°F). Precipitation also varies, with September receiving 58 mm (2.3 in) over 11 days and August recording 78 mm (3.1 in) over 12 days. Interestingly, September has a higher humidity level at 80% compared to August's 73%. For more details, you can check Colchester weather in August.

September typically brings milder temperatures, with averages around 15°C (60°F) and highs reaching up to 24°C (76°F). The month experiences relatively moderate precipitation of 58 mm (2.3 in) over about 11 days, paired with an 80% humidity level. In contrast, October sees a noticeable drop in average temperature to 12°C (54°F) and lower maximums of 22°C (71°F). This month is also wetter, with precipitation increasing to 90 mm (3.5 in) over 14 days and humidity rising to 89%. For a detailed look at what to expect, check out Colchester weather in October.

In September, the weather is marked by a more moderate temperature range, with minimums around 6°C (42°F) and maximums peaking at 24°C (76°F), providing a pleasant average of 15°C (60°F). The month experiences 58 mm (2.3 in) of precipitation across approximately 11 days, and humidity levels sit at a comfortable 80%. In contrast, November brings cooler temperatures, with minimums dropping to 0°C (33°F) and an average of just 8°C (47°F), while maximums reach only 16°C (62°F). This month sees slightly less precipitation at 53 mm (2.1 in) over the same number of days, coupled with higher humidity levels at 92%. For a more detailed perspective, you can check Colchester weather in November.

September and December present notably different weather conditions. In September, temperatures range from a minimum of 6°C (42°F) to a maximum of 24°C (76°F), with an average of 15°C (60°F). The month sees about 58 mm (2.3 in) of precipitation across 11 days, accompanied by a humidity level of 80%. In contrast, December experiences much colder temperatures, with a minimum of -1°C (31°F) and an average of 6°C (44°F), peaking at 14°C (57°F). Precipitation increases to 97 mm (3.8 in) over 15 days, and humidity rises to 92%. For a more detailed look at winter weather specifics, check out Colchester weather in December.

Compare Colchester's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Colchester

As summer begins to fade, September in Colchester offers a distinct shift in weather, marked by cooler temperatures and increased humidity. Unlike the warmer months, where the sun reigns, this transitional period witnesses an uptick in rainfall, with more frequent rainy days. The contrasts become evident as the average temperature hovers around a mild 15°C, providing a refreshing change from the scorching summer heat. Those venturing out will find themselves enjoying crisp mornings and pleasantly warm afternoons, but it's wise to keep an umbrella handy. For a deeper dive into the year-round weather patterns, check out Colchester Climate.