September Weather in Armagh, United Kingdom

Last updated: March 17, 2025

September in Armagh, United Kingdom, offers a mild and variable climate as summer transitions into autumn. With maximum temperatures reaching 23°C (74°F) and an average of 13°C (56°F), early fall days can still feel quite warm. However, nighttime temperatures can dip to a chilly 2°C (35°F), showcasing the region's temperature fluctuations. Expect moderate rainfall, with 72 mm (2.8 in) of precipitation spread across 14 days, contributing to the lush greenery characteristic of this time of year. The high humidity level at 88% adds a touch of dampness to the air, making for a refreshing, albeit sometimes brisk, atmosphere in this historic city.

September Temperature in Armagh

As September rolls into Armagh, temperatures begin to transition into the cooler embrace of autumn. With a minimum of 2°C (35°F) and an average hovering around 13°C (56°F), the city experiences a gentle dip from the warm summer days. The maximum temperature reaches a comfortable 23°C (74°F), offering pleasantly mild afternoons for those looking to enjoy the outdoors. This month marks a shift from the warmer summer months, as the temperature curve steadily declines towards the briskness of October, hinting at the changing seasons and the enchanting colors that autumn brings. The crisp air and fading warmth create a perfect blend for outdoor activities and cozy gatherings alike.

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

The chart illustrates September temperature patterns in Armagh, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec414244475257605955504543
Data source: Temperature data for Armagh 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 Armagh

In September, Armagh experiences an average precipitation of 72 mm (2.8 in) over 14 days, marking a transition into the wetter autumn months. This is a decrease from the previous month's substantial 121 mm (4.8 in), which saw the highest rainfall of the year. September's showers are both plentiful and refreshing, as the region begins to shed its summer coat. Notably, the frequency of rain during this month is more moderate compared to August, indicating a gradual return to the typical patterns of regular, albeit lighter, rainfall leading into October. As autumn unfolds, the skies of Armagh become a blend of crisp air and the soft drumming of rain, highlighting the region's character as it moves towards the winter months.

September Precipitation Trends in Armagh

The chart displays monthly precipitation patterns in Armagh, 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.
JanFebMarAprMayJunJulAugSepOctNovDec6191834968817812172828289
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Armagh

In September, Armagh, United Kingdom, experiences a notable rise in humidity, reaching 88%, which reflects a gradual increase as summer transitions into autumn. This uptick is consistent with the pattern observed throughout the months, where humidity levels remain relatively high, fluctuating between 82% in May and peaking at 90% in November. The trend indicates a shift towards more moisture-laden air as the year progresses, with September showing a slight rebound from the lower figures seen in late spring. As autumn approaches, the climate becomes increasingly humid, setting the stage for the wetter months ahead.

September Average Humidity in Armagh

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

As summer gives way to autumn in September, Armagh, United Kingdom, experiences a moderate UV Index of 5, indicating a balanced time for outdoor activities with a recommended burn time of 30 minutes. This marks a noticeable decline from the peak summer months when the UV Index soared to levels of 7 and 8 in July and June, where sun exposure was more critical. Interestingly, the trend from July’s intense sun slowly transitions, reflecting a safer sun exposure environment as the year progresses—offering a perfect opportunity to enjoy the changing foliage without the fear of quick sunburn. For more detailed insights, check out the Armagh UV Index.

Maximum UV Index Levels in Armagh for September

The chart shows the monthly maximum UV Index (UVI) for Armagh 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.
JanFebMarAprMayJunJulAugSepOctNovDec124578875321
Data source: Armagh 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 Armagh

September in Armagh is a delightful blend of lingering summer warmth and the first hints of autumn, boasting 262 hours of golden sunshine. This month continues the trend of a vibrant sunlit season, following the peak of 365 hours in May and a solid 298 hours in August. As the year progresses, the sunlight begins to taper off, with October ushering in a notable decline to 206 hours. This gradual reduction is characteristic of the transition from the lively summer months into the cooler, dimmer days of fall, but September still offers plenty of reasons to bask in the glow before winter sets in.

Monthly Sunshine Duration in Armagh: September Highlighted

The September sunshine duration represents the total number of hours Armagh 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.
JanFebMarAprMayJunJulAugSepOctNovDec71h134h172h280h365h348h349h298h262h206h101h75h
Data source: Armagh September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Armagh During September

In September, the likelihood of sunny weather in Armagh, United Kingdom, stands at 18%, making it one of the less optimistic months for sunlight. This trend follows a series of summer months, such as July and August, which also feature a low chance of sun, with probabilities sinking to 24% and 20%, respectively. As the year progresses, the chances dwindle from 37% in April—typically the month when bright days begin to emerge—to a mere 16% in October. This pattern suggests that as autumn unfolds, residents and visitors can expect increasingly overcast skies, with September marking a subtle shift into the gloomier months ahead.

Percentage of Sunny Days in September in Armagh

The chart illustrates the percentage of sunny days in Armagh 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 Armagh experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec28%21%16%37%32%20%24%20%18%16%21%13%
Data source: Armagh September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Armagh in September

As summer draws to a close in Armagh, September ushers in a gentle transition with approximately 12 hours of daylight. Following the peak of 17 hours in June, a steady decline becomes evident as the days gradually shorten. This month serves as a bridge between the vibrant long days of summer and the crisp, shorter days of autumn. With daylight tapering off, September offers a beautifully balanced blend of brightness for both outdoor enthusiasts and those seeking to savor the changing seasons, embodying the ripeness of early autumn while hinting at the cozy, darker days ahead.

Average Daylight Hours in Armagh for September

The chart illustrates the variation in daylight duration in Armagh throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec7h 58m9h 44m11h 54m14h 6m16h 3m17h 6m16h 32m14h 46m12h 38m10h 27m8h 27m7h 23m
Data source: Armagh daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Armagh

As September unfolds in Armagh, the average wind speed settles at 3.1 m/s (7 mph), marking a subtle transition from the lighter breezes of summer. Following the gentle winds of July and August, which dipped to 2.3 m/s (5 mph) and 2.8 m/s (6 mph) respectively, September's breath invigorates the air, suggesting a shift towards the more robust gusts typical of autumn. This month witnesses a gradual increase in wind speed, paving the way for the winds of October and November, which both feature averages of 4.1 m/s (9 mph) and 4.2 m/s (9 mph). Overall, September serves as a gentle prelude, bridging the calm of summer with the energetic whispers of fall, inviting residents to revel in the crispness of the changing seasons.

Average September Wind Speed in Armagh

The chart displays monthly wind speed patterns in Armagh, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.65.14.33.03.43.52.32.83.1 m/s4.14.24.2
Data source: Armagh September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Armagh Compares to Other Months

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

September typically offers milder temperatures, with averages around 13°C (56°F) and highs reaching up to 23°C (74°F), while January is much colder, with average temperatures at 5°C (42°F) and maximums of 14°C (58°F). Rainfall in September is slightly higher, with 72 mm (2.8 in) over about 14 days, while January sees 60 mm (2.4 in) across 11 days. Humidity levels remain similar in both months, hovering around 88% in September and 87% in January. For a detailed look at January weather, you can visit Armagh weather in January.

September offers a milder climate with temperatures ranging from a minimum of 2°C (35°F) to a maximum of 23°C (74°F) and an average of 13°C (56°F). The month typically experiences 72 mm (2.8 in) of precipitation over approximately 14 days, combined with high humidity levels of 88%. In contrast, February is colder and registers temperatures from a low of -4°C (24°F) to a high of 15°C (59°F), averaging 6°C (43°F). Precipitation increases slightly to 91 mm (3.6 in) over about 15 days, with humidity marginally lower at 86%. For more detailed information about the weather during February, visit Armagh weather in February.

September generally enjoys milder temperatures compared to March, with average highs reaching up to 23°C (74°F) while March peaks at 17°C (63°F). The minimum temperature in September is more tolerable at 2°C (35°F), whereas March can experience colder nights with lows dropping to -4°C (25°F). Additionally, both months are relatively damp, with September receiving 72 mm (2.8 in) of rainfall over 14 days and March slightly wetter at 83 mm (3.3 in) over 16 days. Humidity levels are quite comparable, with September at 88% and March slightly lower at 86%. For more detailed insights about the weather during March, check out Armagh weather in March.

September and April present contrasting weather patterns as they transition from summer to autumn and winter to spring, respectively. In September, temperatures range from a minimum of 2°C (35°F) to a maximum of 23°C (74°F), averaging 13°C (56°F). The month experiences around 72 mm (2.8 in) of precipitation over 14 days, with a humidity level of 88%. In comparison, April tends to be colder, with temperatures ranging from a low of -3°C (27°F) to a high of 20°C (68°F), averaging only 8°C (47°F). Precipitation in April is lower at 49 mm (1.9 in) over 12 days, and the humidity is slightly lower at 85%. For a detailed look at April's weather, visit Armagh weather in April.

In comparing the weather between September and May, we see some intriguing differences. September tends to have slightly warmer temperatures, with a minimum of 2°C and a maximum reaching 23°C, while May experiences cooler lows at -1°C. However, May can occasionally match September's high, peaking at 24°C. Both months are relatively humid, but September has a higher humidity level at 88%, compared to May’s 82%. Precipitation is similar, with September receiving 72 mm over 14 days and May slightly less at 68 mm over 12 days. For more detailed information on May weather, you can visit Armagh weather in May.

When comparing the weather in September and June, one can see notable differences in both temperature and precipitation. September experiences cooler conditions with minimum temperatures around 2°C (35°F) and an average of 13°C (56°F), while June tends to be warmer, with minimums at 5°C (41°F) and an average temperature of 14°C (58°F). In terms of maximum temperatures, September peaks at 23°C (74°F), contrasting with June's higher maximum of 29°C (84°F). Both months see significant rainfall, with September receiving 72 mm (2.8 in) across 14 days and June slightly wetter at 81 mm (3.2 in) over 15 days. Interestingly, September has a higher humidity level at 88%, compared to June's 84%. For more detailed insights, check out Armagh weather in June.

In comparing the weather between September and July, September tends to be cooler, with average temperatures ranging from a minimum of 2°C (35°F) to a maximum of 23°C (74°F), while July offers warmer conditions, with temperatures ranging from 6°C (43°F) to a maximum of 28°C (82°F). Both months experience a fair amount of precipitation, with September receiving about 72 mm (2.8 in) over 14 days and July slightly more, at 78 mm (3.1 in) over 13 days. Humidity levels are relatively similar, with September at 88% and July at 86%, making both months feel quite damp. For more detailed information about July weather in Armagh, you can check out Armagh weather in July.

September generally sees cooler temperatures compared to August, with minimums dipping down to 2°C (35°F) and average highs reaching 23°C (74°F), while August experiences milder temperatures with minimums around 6°C (42°F) and an average high of 24°C (75°F). Additionally, September has higher humidity levels at 88%, compared to August’s 86%. Precipitation is also notably different; September receives 72 mm (2.8 in) over 14 days, whereas August is wetter with 121 mm (4.8 in) spread across 19 days. For more detailed insights on August weather, visit Armagh weather in August.

In comparing the weather between September and October, we can see a notable decline in temperatures. September typically features a minimum of 2°C and an average of 13°C, with highs reaching up to 23°C. In contrast, October's temperatures drop, with a minimum of -1°C, an average of 10°C, and a maximum of 19°C. Precipitation also increases slightly from September's 72 mm over 14 days to October's 82 mm across 15 days, contributing to a higher humidity level of 89%. For a more detailed look at weather patterns, you can visit Armagh weather in October.

September and November exhibit notable differences in weather characteristics. In September, temperatures range from a minimum of 2°C (35°F) to a maximum of 23°C (74°F), with an average of 13°C (56°F). The month sees around 72 mm (2.8 in) of precipitation over approximately 14 days, accompanied by a humidity level of 88%. In contrast, November experiences cooler temperatures, with a minimum of -3°C (26°F) and a maximum of 15°C (59°F), averaging at 7°C (46°F). The precipitation slightly increases to 82 mm (3.2 in) over 15 days, while humidity levels rise to 90%. For more details, you can check Armagh weather in November.

September weather is characterized by milder temperatures, with minimums around 2°C (35°F) and maximums reaching 23°C (74°F). The month sees an average temperature of 13°C (56°F) and experiences about 72 mm (2.8 in) of precipitation over 14 days, along with relatively high humidity at 88%. In contrast, December brings cooler conditions, with minimum temperatures dropping to -3°C (27°F) and maximums capping at 13°C (56°F), resulting in an average temperature of 6°C (43°F). Precipitation increases slightly to 89 mm (3.5 in) spread over 13 days, and humidity remains similar at 86%. For a detailed look at December weather, you can visit Armagh weather in December.

Compare Armagh's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Armagh

As September rolls in, Armagh experiences a noticeable shift in weather, marked by cooler temperatures and increased humidity that sets the stage for the autumn months ahead. With highs reaching a mild 23°C (74°F) and lows dipping to a brisk 2°C (35°F), the transition is palpable. Rainfall is frequent, with over half the month featuring precipitation, resulting in a total of 72 mm poured throughout. This blend of warmth and wetness contrasts sharply with the drier and warmer summer days that precede it. As you prepare for the changing seasons, understanding the nuances of September's climate can help you fully appreciate the beauty of Armagh's autumn landscape. For a deeper look into Armagh's weather patterns, check out Armagh Climate.