September Weather in Coleraine, United Kingdom

Last updated: March 17, 2025

September in Coleraine, United Kingdom, brings a cool and damp climate, with average temperatures hovering around 14°C (57°F). Maximums can reach 17°C (64°F), while nighttime lows dip to a brisk 9°C (49°F). The month is characterized by a significant precipitation total of 117 mm (4.6 in), spread across 20 rainy days, contributing to the region's lush greenery. Visitors should brace themselves for high humidity levels of 88%, creating a refreshing yet chilly atmosphere that captures the essence of autumn in this vibrant coastal town.

September Temperature in Coleraine

As September arrives in Coleraine, the chill of summer softens, revealing a cozy early autumn atmosphere. With minimum temperatures hovering around 9°C (49°F) and averages settling at 14°C (57°F), it's a time when the warmth of late summer gradually gives way to the crispness of fall. The maximum temperatures enjoy a gentle peak of 17°C (64°F), inviting locals and visitors alike to savor long walks amidst the changing foliage. This transition not only offers a reprieve from the heat but also signals the onset of sweater weather, creating the perfect backdrop for enjoying pumpkin-spiced treats and panoramic views of the stunning landscape.

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

The chart illustrates September temperature patterns in Coleraine, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec454444465054575856534946
Data source: Temperature data for Coleraine 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 Coleraine

September in Coleraine brings a notable shift in precipitation, with 117 mm (4.6 in) of rain falling over 20 days. This marks a continuation of the wet pattern established in August, which recorded the highest rainfall of the year. The trend suggests that as summer gives way to autumn, Coleraine experiences an increase in rainy days, while the total monthly precipitation remains significant. This hints at the region's transition into wetter months, particularly as October approaches, often bringing more sustained downpours with an even higher average of 161 mm (6.3 in). Overall, September serves as a bridge between the summer's wetter days and the more intense rainfall of fall, reinforcing Coleraine's reputation for its variable and vibrant climate.

September Precipitation Trends in Coleraine

The chart displays monthly precipitation patterns in Coleraine, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1091321125573105110146117161156166
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Coleraine

In September, Coleraine experiences a notable rise in humidity levels, reaching 88%, which marks a slight increase from the 86% recorded in the preceding months of July and August. This trend suggests a transition into the autumn season, with humidity gradually intensifying as the year progresses; indeed, October follows closely with an even higher 89%. The overall pattern reveals that as summer fades, moisture in the air tends to accumulate, peaking in the late autumn months, with November hitting 90%. Coleraine's consistent humidity levels throughout the year, which hover in the mid to upper 80s, reflect its maritime climate, providing a damp backdrop to the region’s rich, lush landscapes.

September Average Humidity in Coleraine

This chart illustrates the average monthly humidity levels in Coleraine, 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.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%86%85%82%84%86%86%88%89%90%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Coleraine

In September, Coleraine, United Kingdom, experiences a UV Index of 5, marking a return to a moderate exposure category following the peak summer months. As the season transitions, residents can expect a burn time of approximately 30 minutes under direct sunlight, signaling a need for sun protection when outdoors. This slight decrease in UV intensity from the highs of July and August highlights a natural ebb in summer's strength, yet still encourages caution while enjoying the lingering warmth of early autumn. For those looking for detailed UV insights, visit Coleraine UV Index.

Maximum UV Index Levels in Coleraine for September

The chart shows the monthly maximum UV Index (UVI) for Coleraine 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.
JanFebMarAprMayJunJulAugSepOctNovDec123568865321
Data source: Coleraine 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 Coleraine

September in Coleraine, United Kingdom, ushers in a delightful shift in sunshine, offering 283 hours of radiant daylight that captures the essence of early autumn. This month, while less sun-soaked than the height of summer, still stands out as a remarkable transition from the 405 hours enjoyed in May and 404 hours in July. As the days start to shorten, the sun’s gentle warmth lingers, inviting locals and visitors alike to savor the breathtaking landscapes painted in vibrant autumn hues. With October looming just around the corner and its 224 hours of sunshine, September serves as a beautiful bridge, encouraging outdoor exploration before the darker months settle in.

Monthly Sunshine Duration in Coleraine: September Highlighted

The September sunshine duration represents the total number of hours Coleraine 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.
JanFebMarAprMayJunJulAugSepOctNovDec72h146h207h319h405h389h404h357h283h224h117h81h
Data source: Coleraine September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Coleraine During September

In September, the likelihood of sunny weather in Coleraine, United Kingdom, stands at 23%, mirroring the trend observed in January and July. This percentage suggests a transitional period as summer gives way to autumn, with sunshine becoming less predictable. While earlier months like April and May show higher chances of sun, September’s figures indicate a gradual decline similar to what is seen in other fall months such as October and November. Though not the sunniest, September still offers a fair opportunity for clear skies, making it a pleasant time for outdoor activities before the chill of autumn fully sets in.

Percentage of Sunny Days in September in Coleraine

The chart illustrates the percentage of sunny days in Coleraine 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 Coleraine experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec23%25%15%43%36%22%24%20%23%16%16%14%
Data source: Coleraine September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Coleraine in September

As summer gives way to autumn, September in Coleraine, United Kingdom, showcases a comforting 12 hours of daylight. This transition follows the peak of June, when the daylight stretches to an impressive 17 hours, gradually tapering through July and August's 16 and 14 hours respectively. The shift can be felt as the nights grow longer, signaling the approach of autumn with October dropping to 10 hours and a continued downward trend into the winter months. Overall, September serves as a gentle reminder of the changing seasons, balancing warm, sun-drenched days with the impending chill of autumn nights.

Average Daylight Hours in Coleraine for September

The chart illustrates the variation in daylight duration in Coleraine throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec7h 49m9h 40m11h 53m14h 10m16h 11m17h 17m16h 41m14h 51m12h 39m10h 24m8h 21m7h 13m
Data source: Coleraine daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Coleraine

As summer fades into autumn, September in Coleraine offers a gentle transition with an average wind speed of 5.5 m/s (12 mph). This mild breeze follows a notably calmer August and is a precursor to the brisker winds of October, which escalate to 7.7 m/s (17 mph). Over the course of the year, wind speeds in Coleraine typically peak during the winter months, with February recording one of the highest averages at 10.5 m/s (23 mph). However, September's lighter winds create a serene atmosphere, ideal for enjoying the early signs of fall, as nature prepares for the gustier days ahead. With each month presenting distinct trends, September serves as a gentle reminder of the changing seasons, as the winds slowly build back towards their winter vigor.

Average September Wind Speed in Coleraine

The chart displays monthly wind speed patterns in Coleraine, 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.
JanFebMarAprMayJunJulAugSepOctNovDec7.810.57.55.96.25.73.84.55.5 m/s7.79.38.3
Data source: Coleraine September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Coleraine Compares to Other Months

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

In September, the weather is generally milder with average temperatures ranging from a minimum of 9°C (49°F) to a maximum of 17°C (64°F). The month sees a significant amount of rainfall, totaling 117 mm (4.6 in) over about 20 days, contributing to a high humidity level of 88%. In contrast, January brings cooler temperatures, with a minimum of 2°C (36°F) and a maximum of 13°C (56°F), averaging around 7°C (45°F). Precipitation is slightly lower at 109 mm (4.3 in) spread over 17 days, while humidity stays quite similar at 87%. For more detailed information about January weather, you can visit Coleraine weather in January.

In comparing the weather of September and February, we see notable differences in temperature and precipitation patterns. September typically enjoys milder temperatures, with averages reaching up to 14°C (57°F) and a maximum of 17°C (64°F), while February is significantly colder, averaging just 7°C (44°F) with a maximum of 12°C (54°F). Precipitation is relatively high in both months, with September receiving 117 mm (4.6 in) over 20 days and February having slightly more at 132 mm (5.2 in) over 18 days. Humidity levels are also comparable, with September at 88% and February slightly lower at 86%. For more detailed insights into February's climate, you can check Coleraine weather in February.

When comparing the weather in September and March, notable differences emerge. September enjoys milder temperatures, with averages around 14°C (57°F), while March is cooler, averaging only 7°C (45°F). The minimum temperature in March can even drop below freezing, reaching as low as -1°C (31°F), whereas September stays relatively warm, not falling below 9°C (49°F). Precipitation levels are quite similar, with September receiving 117 mm (4.6 in) over 20 days and March slightly less at 112 mm (4.4 in) over 18 days. Humidity levels are comparable as well, with September at 88% and March at 86%. For a more detailed look at the March climate, visit Coleraine weather in March.

In September, temperatures are generally milder, with averages around 14°C (57°F) and maximums reaching up to 17°C (64°F), compared to the cooler April averages of 8°C (47°F). While both months experience a decent amount of precipitation, September sees significantly more with 117 mm (4.6 in) over approximately 20 days, whereas April has only 55 mm (2.2 in) across 12 days. Additionally, September's humidity is slightly higher at 88%, compared to April's 85%, contributing to a more damp atmosphere as summer transitions into fall. For a closer look at what to expect during this spring month, you can check out Coleraine weather in April.

When comparing the weather in September and May, September tends to be slightly warmer, with average temperatures ranging from a minimum of 9°C (49°F) to a maximum of 17°C (64°F), while May sees temperatures from a minimum of 5°C (41°F) to a maximum of 16°C (61°F). Additionally, September experiences more significant rainfall, with an average precipitation of 117 mm (4.6 in) over 20 days, compared to May's 72 mm (2.9 in) over 13 days. Humidity levels are also higher in September at 88%, compared to May's 82%. For more detailed information, you can check Coleraine weather in May.

In comparing the weather between September and June, we can see some notable similarities and differences. Both months have a maximum temperature of around 17°C (64°F), but September tends to be slightly warmer on average, with a temperature of 14°C (57°F) compared to June's 12°C (54°F). Humidity levels are quite high in both months, with September at 88% and June at 84%. Additionally, September experiences more precipitation, totaling 117 mm (4.6 in) over 20 days, while June sees slightly less with 105 mm (4.1 in) across 17 days. For more detailed information on June weather, you can check Coleraine weather in June.

When comparing the weather in July and September, one can observe notable differences in temperatures and precipitation patterns. In July, the temperatures range from a minimum of 11°C (52°F) to a maximum of 19°C (67°F), with an average of 14°C (57°F). This month has slightly less rainfall, totaling 110 mm (4.3 in) over 17 days, and the humidity is around 86%. In contrast, September sees cooler temperatures, with a minimum of 9°C (49°F) and a maximum of 17°C (64°F), while maintaining the same average of 14°C (57°F). However, September experiences more rainfall, totaling 117 mm (4.6 in) over 20 days, and slightly higher humidity at 88%. For more details, you can visit Coleraine weather in July.

In comparing the weather of September and August, September generally experiences slightly cooler temperatures with a minimum of 9°C (49°F), compared to August's minimum of 11°C (52°F). Both months have the same average temperature of 14°C (57°F), but September's maximum temperature reaches a modest 17°C (64°F), while August sees a slightly warmer maximum of 18°C (66°F). Precipitation levels are notable in both months, with September receiving 117 mm (4.6 in) of rain over 20 days, while August has higher rainfall at 146 mm (5.7 in) over the same number of days. Humidity remains high in both months, with September at 88% and August just slightly lower at 86%. For more details about August weather specifics, you can visit Coleraine weather in August.

In September, temperatures typically range from a minimum of 9°C (49°F) to a maximum of 17°C (64°F), with an average around 14°C (57°F). The month sees a total precipitation of 117 mm (4.6 in) across approximately 20 days, accompanied by high humidity levels averaging 88%. In contrast, October brings cooler temperatures, with a minimum of 5°C (42°F) and a maximum of 16°C (62°F), averaging at 12°C (53°F). Additionally, October is rainier, experiencing 161 mm (6.3 in) of precipitation over 24 days and slightly higher humidity at 89%. For more details on October's weather, you can visit Coleraine weather in October.

In September, the weather presents a moderate transition with temperatures ranging from a cool 9°C (49°F) at night to a comfortable 17°C (64°F) during the day, averaging around 14°C (57°F). However, the month is relatively wet, with a total precipitation of 117 mm (4.6 in) spread over 20 days, along with high humidity levels at 88%.

In contrast, November sees a significant drop in temperatures, with nightly lows of 4°C (40°F) and daytime highs peaking at 14°C (58°F), leading to an average of just 9°C (49°F). This month also experiences increased rainfall, accumulating to 156 mm (6.2 in) over 23 days, and slightly higher humidity at 90%. For a more detailed look into the weather patterns, check out Coleraine weather in November.

In September, temperatures in Coleraine range from a minimum of 9°C (49°F) to a maximum of 17°C (64°F), with an average temperature of 14°C (57°F). The month experiences significant rainfall, totaling 117 mm (4.6 in) over approximately 20 days, contributing to a high humidity level of 88%. In contrast, December sees a drop in temperatures, with minimums around 2°C (35°F) and maximums of 12°C (54°F), averaging 8°C (46°F). Precipitation increases to 166 mm (6.5 in) over 23 days, maintaining a slightly lower humidity of 86%. For more detailed information, you can check Coleraine weather in December.

Compare Coleraine's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Coleraine

As September rolls in, Coleraine experiences a gentle transition towards autumn, featuring milder temperatures that range from cool to pleasantly warm. The month is characterized by increased humidity, making the air feel a bit heavier, and frequent rainfall, with about two-thirds of the days seeing some precipitation. Unlike the sunnier summer months, September gives way to a more subdued atmosphere, inviting a vibrant tapestry of autumnal colors in the surroundings. For a deeper insight into Coleraine's shifting weather patterns throughout the year, visit Coleraine Climate.