September Weather in Exeter, United Kingdom

Last updated: March 17, 2025

September in Exeter, United Kingdom, offers a delightful tapestry of weather experiences. With maximum temperatures reaching a warm 26°C (80°F) and an average of 14°C (58°F), the month presents a pleasant transition towards autumn. However, the temperature can dip as low as 4°C (39°F), reminding residents of the approaching cooler months. Rainfall records show 53 mm (2.1 in) of precipitation over 9 days, contributing to the region's lush greenery. Moreover, with humidity levels averaging 79%, it’s a time when the air feels notably crisp yet comfortable, inviting both locals and visitors to enjoy Exeter’s scenic charm.

September Temperature in Exeter

As September unfolds in Exeter, United Kingdom, residents and visitors experience a delightful transition into autumn. With temperatures ranging from a mild minimum of 4°C (39°F) to a pleasant maximum of 26°C (80°F), it’s a time where warm days linger, inviting outdoor activities and leisurely strolls. The average temperature settles around 14°C (58°F), creating a comfortable backdrop for the vibrant changes in foliage. This month stands out as a bridge between the warm heights of summer and the cool embrace of fall, showcasing a gentle decline in temperatures while still offering those precious sunny days. As the days gradually shorten, the crispness in the air hints at the transformative beauty of the season ahead.

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

The chart illustrates September temperature patterns in Exeter, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec424345485359636158534745
Data source: Temperature data for Exeter 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 Exeter

September in Exeter sees a modest amount of rainfall, with an average precipitation of 53 mm (about 2.1 inches) spread across approximately 9 wet days. This slight dip in rainfall compared to the summer months aligns with a general trend of decreasing precipitation as autumn approaches. August, with its 73 mm (2.9 inches), typically brings more moisture before the transition. As the month of September progresses, the city can expect cooler weather and a gradual increase in rainfall, preparing residents for the wetter months ahead, particularly October, which experiences a significant surge to 99 mm (3.9 inches).

September Precipitation Trends in Exeter

The chart displays monthly precipitation patterns in Exeter, 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.
JanFebMarAprMayJunJulAugSepOctNovDec506981527480667353996796
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Exeter

As September rolls in, Exeter experiences a slight dip in humidity, with levels hovering around 79%. This marks a transition from the more humid summer months, such as July's 70% and August's 73%, reflecting a gradual shift towards the wetter, chillier autumn. Notably, September's humidity stands significantly lower than the winter months ahead, where averages rise dramatically to 89% in October and 90% in November. This pattern illustrates Exeter's characteristic variability, where the balmy summer air gives way to the crispness of fall, creating an inviting atmosphere for outdoor activities before the rains of autumn arrive.

September Average Humidity in Exeter

This chart illustrates the average monthly humidity levels in Exeter, 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.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%86%84%80%80%70%73%79%89%90%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Exeter

As September unfolds in Exeter, the UV Index stands at 6, categorizing it as high and indicating a burn time of approximately 25 minutes for unprotected skin. This marks a slight decline from the intense UV levels of summer, yet it remains pivotal to practice sun safety. Throughout the year, Exeter experiences a notable progression in UV exposure, starting from a low index of 2 in January and February, peaking at a very high index of 9 in June. The trend of decreasing UV levels from summer into autumn suggests that while the risk remains significant in September, it is certainly more manageable than the blistering days of July and August. For more information on the UV Index trends in Exeter, visit Exeter UV Index.

Maximum UV Index Levels in Exeter for September

The chart shows the monthly maximum UV Index (UVI) for Exeter 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.
JanFebMarAprMayJunJulAugSepOctNovDec224679876421
Data source: Exeter 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 Exeter

As September unfolds in Exeter, the city basks in a generous 317 hours of sunshine, a delightful continuation of the summer warmth that peaked in July with 418 hours. This upward trend in sunshine hours, beginning with a modest 97 hours in January, steadily climbs through the spring and summer months, culminating in May's radiant 405 hours. While September experiences a natural decline as autumn approaches, the lingering sunlight signifies a gentle transition, reminding residents of the vibrant summer just passed. This pattern showcases Exeter's seasonal charm, where each month brings its unique glow, inviting both locals and visitors to savor the last rays of sunshine before winter's embrace.

Monthly Sunshine Duration in Exeter: September Highlighted

The September sunshine duration represents the total number of hours Exeter 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.
JanFebMarAprMayJunJulAugSepOctNovDec97h153h219h343h405h392h418h381h317h250h142h115h
Data source: Exeter September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Exeter During September

In Exeter, September embraces a 28% chance of sunny weather, marking a notable transition as summer gives way to autumn. This probability reflects a slight dip from the peak sunshine of April at 51%, while remaining more favorable than the preceding months of July and August, which offer 37% and 27% chances respectively. As the year progresses into the cooler seasons, September’s weather hints at the lingering warmth of summer, despite being overshadowed by the increasing likelihood of cloudier days. Overall, while sunshine may be less predictable, September still holds a decent opportunity for enjoying those golden rays before autumn firmly sets in.

Percentage of Sunny Days in September in Exeter

The chart illustrates the percentage of sunny days in Exeter 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 Exeter experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec19%22%32%51%32%25%37%27%29%22%30%20%
Data source: Exeter September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Exeter in September

As summer fades into autumn, September in Exeter, United Kingdom, offers a gentle transition with 12 hours of daylight. This month marks a noticeable shift from the long, sun-kissed days of summer, where June peaked at 16 hours of daylight. With each passing month, daylight gradually diminishes, starting from 15 hours in July and declining to 14 hours in August. This trend continues into October, where daylight dips further to 10 hours, indicating nature's slow progression towards the cozy, shorter days of winter. September's moderate daylight not only showcases the beauty of the season but also invites residents and visitors alike to relish the lingering warmth before the colder months approach.

Average Daylight Hours in Exeter for September

The chart illustrates the variation in daylight duration in Exeter throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 30m10h 1m11h 55m13h 51m15h 32m16h 24m15h 56m14h 26m12h 34m10h 38m8h 55m8h
Data source: Exeter daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Exeter

As September arrives in Exeter, the winds begin to whisper a softer tune, with an average speed of 3.4 m/s (8 mph), making it one of the calmest months of the year. This marks a noticeable dip from the breezier days of earlier summer, reflecting a gentle transition towards autumn. Following the more moderate winds of July and August, September signals a shift in the air, inviting visitors to enjoy the crispness without the hustle of stronger gusts. Notably, this calm persists into October, where the winds pick up a bit, but the overall trend showcases Exeter’s gradual move into the quieter, serene months of fall.

Average September Wind Speed in Exeter

The chart displays monthly wind speed patterns in Exeter, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.75.54.53.54.73.23.63.93.4 m/s4.43.84.9
Data source: Exeter September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Exeter Compares to Other Months

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

September and January present distinctly different weather conditions. In September, temperatures range from a minimum of 4°C (39°F) to a maximum of 26°C (80°F), with an average of 14°C (58°F) and relatively moderate humidity at 79%. The month experiences about 53 mm (2.1 in) of precipitation across 9 days, indicating a transition towards autumn.

In contrast, January is notably colder, with temperatures dipping as low as -4°C (26°F) and reaching a maximum of 14°C (57°F), averaging around 6°C (42°F). The humidity is higher at 88%, contributing to a chillier feel, and precipitation remains similar at 50 mm (2.0 in) over 9 days. For more detailed information, you can check Exeter weather in January.

September and February present distinctly different weather conditions. September typically enjoys milder temperatures, with minimums around 4°C (39°F) and maximums reaching up to 26°C (80°F), averaging at 14°C (58°F). The humidity in September is relatively comfortable at 79%, with some precipitation amounting to 53 mm (2.1 in) over about 9 days. In contrast, February experiences colder weather, with minimum temperatures dropping to -6°C (22°F) and an average of only 6°C (44°F), peaking at 16°C (60°F). The month is characterized by higher humidity at 88% and slightly more precipitation totaling 69 mm (2.7 in) over 12 days. For more detailed insight, you can check out Exeter weather in February.

In comparing the weather of September to March, a noticeable difference emerges in both temperature and precipitation. September typically enjoys milder temperatures, with lows around 4°C (39°F) and highs reaching up to 26°C (80°F). This month sees an average temperature of 14°C (58°F) and experiences about 53 mm of precipitation over 9 days, with a humidity level of 79%. In contrast, March is significantly cooler, with temperatures ranging from a minimum of -6°C (21°F) to a maximum of 18°C (65°F), averaging at 7°C (45°F). This month has higher precipitation levels at 81 mm over 15 days and increased humidity at 86%. For a more detailed look at March weather, visit Exeter weather in March.

When comparing the weather in September and April, notable differences emerge. September boasts a more moderate temperature range, with minimums around 4°C (39°F) and maximums reaching 26°C (80°F). In contrast, April starts cooler with minimum temperatures dipping to -2°C (29°F) and maximums only reaching 22°C (71°F). Both months experience similar levels of precipitation, with September recording 53 mm and April slightly lower at 52 mm, each spread over 9 days. Interestingly, April has a slightly higher humidity level at 84% compared to September's 79%. For more detailed information about the April weather, you can visit Exeter weather in April.

When comparing the weather in September and May, September generally offers a wider range of temperatures, with daily averages peaking at 14°C (58°F) and maxing out at 26°C (80°F), while May's average is slightly cooler at 12°C (54°F) and tops off at 24°C (75°F). In terms of precipitation, September sees less rainfall at 53 mm (2.1 in) over approximately 9 days, compared to May's heavier 74 mm (2.9 in) spread over about 12 days. Both months have similar humidity levels, hovering around 79% for September and 80% for May, contributing to a generally damp feel. For more detailed insights, you can visit Exeter weather in May.

When comparing the weather in September and June, we notice a few key differences. In September, temperatures range from a minimum of 4°C (39°F) to a maximum of 26°C (80°F), with an average of 14°C (58°F). The month sees about 53 mm (2.1 in) of precipitation spread over 9 days, maintaining a humidity level of 79%. Conversely, June is slightly warmer with temperatures ranging from 6°C (43°F) to 28°C (83°F), and an average temperature of 15°C (60°F). However, it experiences higher precipitation at 80 mm (3.2 in) over 12 days, resulting in a humidity level of 80%. For a more detailed look at June weather, visit Exeter weather in June.

In comparing the weather between September and July, September presents a cooler climate, with minimum temperatures dropping to 4°C (39°F) compared to July's minimum of 8°C (47°F). The average temperature in September is 14°C (58°F), while July enjoys a warmer average of 17°C (63°F). Both months exhibit relatively similar maximum temperatures, peaking at 26°C (80°F) in September and 28°C (83°F) in July. Precipitation is slightly higher in July at 66 mm (2.6 in) over 12 days, compared to September's 53 mm (2.1 in) across 9 days. Additionally, September's humidity level is slightly higher at 79%, compared to July's 70%. For a more detailed look at July weather, check this link: Exeter weather in July.

In August, the weather is generally warmer, with minimum temperatures around 8°C (47°F) and maximums reaching 28°C (83°F), contributing to an average of 16°C (62°F). This month sees slightly more rainfall, with 73 mm (2.9 in) recorded over 11 days and a lower humidity level of 73%. In contrast, September brings cooler temperatures, with a minimum of 4°C (39°F) and a maximum of 26°C (80°F), resulting in a comfortable average of 14°C (58°F). Although it experiences less rainfall at 53 mm (2.1 in) over 9 days, humidity rises to 79%, making September feel more humid than August. For more detailed information, you can visit Exeter weather in August.

In September, the weather is generally milder, with temperatures ranging from a minimum of 4°C (39°F) to a maximum of 26°C (80°F) and an average of 14°C (58°F). This month sees about 53 mm (2.1 in) of precipitation over approximately 9 days and a relative humidity of 79%.

In contrast, October ushers in cooler temperatures, with a minimum of -1°C (31°F) and a maximum of 20°C (69°F), averaging 12°C (53°F). Rainfall increases significantly to 99 mm (3.9 in) spread across 14 days, accompanied by higher humidity levels of 89%. For a more detailed outlook on the weather conditions in October, you can check out Exeter weather in October.

September and November weather showcase a notable shift in temperatures and conditions. In September, the average temperature reaches a pleasant 14°C (58°F), peaking at a warm 26°C (80°F) during the day, while nights cool down to around 4°C (39°F). This month also sees relatively moderate precipitation of 53 mm (2.1 in) over 9 days, and humidity levels at 79%.

In contrast, November experiences a significant drop in temperature, with an average of just 8°C (47°F) and maximums reaching only 16°C (60°F). The nights can be chilly, dipping to -1°C (31°F). This month tends to be wetter, with 67 mm (2.6 in) of rain spread across 12 days, and humidity levels rise to 90%. Overall, while September brings milder and sunnier days, November ushers in colder temperatures and increased precipitation. For more detailed information, visit Exeter weather in November.

September and December offer contrasting weather experiences. In September, temperatures range from a mild 4°C (39°F) at night to a pleasant 26°C (80°F) during the day, with an average of 14°C (58°F). The month sees relatively low precipitation of 53 mm (2.1 in) spread over 9 days and a humidity level of 79%. In contrast, December brings colder weather, with nighttime temperatures dipping to -2°C (29°F) and daytime highs peaking at just 14°C (57°F), averaging around 7°C (45°F). This month experiences more frequent rain, totaling 96 mm (3.8 in) over 16 days, and a higher humidity of 89%. For more information about December weather in Exeter, visit Exeter weather in December.

Compare Exeter's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Exeter

As September rolls in, Exeter's weather presents a delightful transition from the warmth of summer towards the cooler embrace of autumn. With temperatures oscillating between a comfortable average and cooler lows, the month offers a refreshing escape from the sweltering heat typically felt in the preceding months. Despite experiencing around nine days of precipitation, the humidity remains relatively high, contributing to that classic crisp autumn air. This unique blend of conditions makes September a particularly charming time to explore the beauty of Exeter. For a deeper understanding of what to expect throughout the year, visit Exeter Climate.