Last updated: March 17, 2025
September in Gaillimh, Ireland showcases a dynamic climate characterized by a maximum temperature of 26°C (80°F) and a more moderate average of 13°C (56°F)*. As summer gives way to autumn, temperatures can dip to a chilly minimum of 1°C (34°F). This month typically experiences 82 mm (3.2 in) of rainfall spread over approximately 14 days, resulting in a high humidity level of 88%. Whether you’re exploring the vibrant landscapes or enjoying the cozy local culture, September offers a mix of warmth and refreshing showers that embody the unique allure of Ireland's west coast.
In Gaillimh, Ireland, September marks a gentle shift towards autumn, showcasing a delightful range of temperatures. The minimum temperature hovers around 1°C (34°F), while the average settles at a comfortable 13°C (56°F). Daytime temperatures can reach a pleasant 26°C (80°F), offering a lovely contrast to the cooler nights. This month stands out as a transitional period, bridging the warmth of late summer and the crispness of early fall. As the leaves begin to change, September invites both locals and visitors to embrace the mild days and cooler evenings, making it an ideal time for outdoor adventures in this charming Irish city.
September in Gaillimh sees a relatively moderate precipitation total of 82 mm (3.2 in), reflecting a slightly damp transition from the summer months. With 14 days of rain, the month maintains a balance between wet and dry spells, characteristic of early autumn. This pattern marks a decline from the significantly wetter August, which recorded 122 mm (4.8 in) over 18 days. As the season progresses into October, precipitation levels are expected to rise again, with 113 mm (4.4 in) anticipated. Overall, September serves as a pivotal month, where the lingering warmth of summer meets the encroaching chill and moisture of autumn, making Gaillimh's climate dynamic and ever-changing.
In Gaillimh, Ireland, the month of September experiences a notable rise in humidity, reaching 88%. This figure aligns with the high humidity levels typical of the preceding months, particularly in January and February, which also hover at 88%. The summer months show a slight dip, with humidity levels dipping to 83% in May and June before gradually climbing again in July and August. As the year transitions from summer to autumn, September marks a return to higher moisture levels, setting the stage for the increasingly humid conditions that follow in October and November, with humidity peaking at 91%. This trend highlights how the coastal climate of Gaillimh maintains a consistent level of dampness, especially as the seasons change.
In Gaillimh, Ireland, the September UV Index reflects a transitional shift towards autumn, with a moderate UV Index of 5 and a burn time of 30 minutes. This indicates a decline from the summer peak, as seen in July and August, where the UV Index reached a very high level of 8. The moderate exposure category not only suggests safer outdoor activities without heavy sun protection, but also calls for a mindful approach, particularly if you plan to spend extended time outdoors. As the summer sun fades, it's important to stay aware of the changing UV conditions. For more detailed information, you can check out the full Gaillimh UV Index.
UV Risk Categories
As summer gradually unfurls into autumn, September in Gaillimh offers a gentle blend of warmth and light, showcasing 284 hours of sunshine. This month, while fewer than the sun-drenched days of summer, still holds a significant share of sun compared to the depths of winter. May shines brightly with the highest count at 396 hours, heralding the peak of the season, while April and June also bask in generous sunlight, with 315 and 382 hours respectively. Interestingly, as we approach October, there's a notable dip to 220 hours, signifying a retreat of those long, golden days. Overall, September serves as a beautiful transition, with its sunlight inviting a cozy embrace before the shorter days of fall fully set in.
September in Gaillimh, Ireland, typically sees a modest 15% chance of sunny weather, making it one of the less promising months for sunshine. As summer fades and autumn begins, the likelihood of clear skies diminishes compared to the brighter months preceding it. While April boasts a more favorable 43% chance, the trend towards shorter, cloudier days is evident as we transition into autumn. This dip aligns with the general climate pattern observed throughout the year, where sunny days become increasingly elusive as the seasons shift. Therefore, visitors should prepare for overcast skies and occasional rain rather than expect the sunshine that characterizes the earlier summer months.
In September, Gaillimh, Ireland, enjoys a delightful transition as the days begin to shorten, offering around 12 hours of daylight. This month represents a gentle shift from the long, sunlit days of summer, where June and July bask in 16 hours of daylight, down to the softening light of autumn. As the vibrant shades of autumn foliage start to emerge, daylight gradually wanes, heralding the approach of a cozy October with just 10 hours of daylight. This trend reflects a natural rhythm in Gaillimh's climate, inviting residents and visitors alike to savor the lingering warmth of early fall while embracing the beauty of shorter days ahead. The gradual decrease in daylight reminds us of nature's cyclical dance, setting the stage for the deepening winter months that follow.
As September arrives in Gaillimh, Ireland, the average wind speed settles at a gentle 3.4 m/s (8 mph), mirroring the breezy conditions of August. This consistency hints at a transitional period as summer's warmth gives way to autumn's chill. Throughout the year, wind speeds typically fluctuate, peaking notably in February at 5.5 m/s (12 mph) and declining to a low of 2.6 m/s (6 mph) in July. With September's tranquil breezes, the overall trend suggests a gradual increase in wind strength as the year progresses towards the busier months of autumn. This subtle dance of the winds paints a vivid portrait of Gaillimh’s changing seasons, where breezes are both a comfort and a herald of the crisp weather to come.
The weather in Gaillimh 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 Gaillimh and find detailed weather information for every month.
September and January present contrasting weather patterns, highlighting the transition from summer to winter. In September, temperatures range from a chilly minimum of 1°C (34°F) to a pleasant maximum of 26°C (80°F), with an average of 13°C (56°F). This month experiences about 82 mm (3.2 in) of precipitation over 14 days, with humidity remaining high at 88%. In contrast, January is significantly cooler, featuring temperatures that range from a minimum of -5°C (24°F) to a maximum of 14°C (58°F), with an average of 6°C (43°F). Precipitation in January is slightly lower, at 77 mm (3.0 in) over 12 days, yet the humidity remains consistent at 88%. For more information on January weather specifics in Gaillimh, visit Gaillimh weather in January.
September and February present quite contrasting weather conditions. In September, temperatures range from a cool 1°C (34°F) at night to a warm 26°C (80°F) during the day, with an average of 13°C (56°F). Despite being one of the driest months, it still experiences 82 mm (3.2 in) of precipitation over about 14 days, maintaining a high humidity level of 88%.
In contrast, February is significantly cooler, with temperatures dipping as low as -4°C (26°F) at night and peaking at 16°C (60°F), averaging around 6°C (44°F). This month is wetter, with 127 mm (5.0 in) of rain spread over approximately 16 days, all while keeping the humidity at 88%. For a more detailed look at February weather in Gaillimh, check out Gaillimh weather in February.
In comparing the weather of September to that of March, we find notable differences in temperature and precipitation patterns. September typically enjoys milder temperatures, ranging from a minimum of 1°C (34°F) to a maximum of 26°C (80°F), with an average temperature of 13°C (56°F). In contrast, March is cooler, with temperatures ranging from a minimum of -5°C (23°F) to a maximum of 18°C (64°F) and an average of 7°C (45°F).
Though September is slightly drier, with 82 mm (3.2 in) of precipitation over 14 days, March experiences more precipitation, totaling 104 mm (4.1 in) over a slightly longer duration of 16 days. Both months have high humidity levels, with September at 88% and March close behind at 87%. For a more detailed look at March weather patterns, you can refer to Gaillimh weather in March.
In September, temperatures range from a chilly 1°C (34°F) at night to a warm 26°C (80°F) during the day, averaging around 13°C (56°F). The month experiences more rainfall, with 82 mm (3.2 in) of precipitation over about 14 days and a high humidity level of 88%. In contrast, April offers cooler temperatures, with a minimum of -2°C (28°F) and a maximum of 22°C (71°F), averaging 9°C (49°F). Rainfall is lighter, totaling 63 mm (2.5 in) across roughly 10 days, along with slightly lower humidity at 86%. For a more detailed look at the April weather, visit Gaillimh weather in April.
In comparing the weather of September and May, we observe that September typically has a wider temperature range, with minimal temperatures of 1°C (34°F) and maximums reaching 26°C (80°F), averaging around 13°C (56°F). In contrast, May experiences slightly cooler conditions, with minimum temperatures dropping to -1°C (31°F) and average highs of 25°C (78°F), resulting in an average of 12°C (53°F). Precipitation levels in September are a bit higher, averaging 82 mm (3.2 in) over 14 days, compared to May's 70 mm (2.8 in) over 13 days. Humidity is also slightly more in September at 88%, while May sees a lower humidity of 83%. For more detailed insights into weather patterns in May, you can check out Gaillimh weather in May.
September and June offer contrasting weather experiences. In September, temperatures range from a chilly minimum of 1°C (34°F) to a pleasant maximum of 26°C (80°F), with an average of 13°C (56°F). The month sees about 82 mm (3.2 in) of precipitation over 14 days, accompanied by a high humidity level of 88%. In comparison, June features slightly warmer temperatures with a minimum of 4°C (40°F) and a maximum of 30°C (87°F), averaging 14°C (57°F). The precipitation is nearly similar at 83 mm (3.3 in) across 15 days, but the humidity is lower at 83%. For more details on June weather, you can check Gaillimh weather in June. Overall, June is generally milder and drier than September.
In comparing the weather between September and July, September tends to be cooler overall, with average temperatures ranging from a minimum of 1°C (34°F) to a maximum of 26°C (80°F), whereas July experiences warmer temperatures, with a minimum of 6°C (43°F) and a maximum of 29°C (85°F). Both months see a similar amount of precipitation—82 mm (3.2 in) in September and 85 mm (3.4 in) in July—but rainfall occurs slightly more frequently in September, with 14 rainy days compared to 13 in July. The humidity is also a bit higher in September at 88%, compared to July's 85%. For more details on July's climate conditions, visit Gaillimh weather in July.
September brings a cooler and more variable climate compared to August. The minimum temperature in September dips to 1°C (34°F), while the average temperature is around 13°C (56°F), peaking at a maximum of 26°C (80°F). In contrast, August sees slightly warmer temperatures with a minimum of 6°C (44°F) and an average of 15°C (59°F), reaching a maximum of 24°C (75°F). The precipitation in September totals 82 mm (3.2 in) over 14 days, while August experiences higher rainfall at 122 mm (4.8 in) across 18 days. Despite September having fewer rain days, it maintains a higher humidity level at 88%, compared to August's 85%. For more detailed weather information, check out Gaillimh weather in August.
In September, the weather transitions from warm summer days to cooler autumn conditions, with temperatures ranging from a minimum of 1°C (34°F) to a maximum of 26°C (80°F) and an average of 13°C (56°F). This month experiences approximately 82 mm (3.2 in) of rainfall over 14 days, contributing to a humid atmosphere at 88%.
Conversely, October ushers in cooler temperatures, with a minimum of -1°C (31°F), an average of 11°C (51°F), and a maximum of 20°C (68°F). Rainfall increases to 113 mm (4.4 in) over 17 days, leading to heightened humidity at 91%. These factors make October notably wetter and cooler compared to September. For more details, you can check Gaillimh weather in October.
September and November present distinct weather patterns as they transition from late summer to early winter. In September, temperatures can range from a minimum of 1°C (34°F) to a maximum of 26°C (80°F), with an average of 13°C (56°F), making it generally warmer than November, where temperatures drop, reaching a low of -2°C (29°F) and an average of 8°C (47°F) with a maximum of 15°C (60°F). Additionally, September experiences 82 mm (3.2 in) of precipitation over approximately 14 days, while November sees an increase to 94 mm (3.7 in) across 16 days, reflecting a wetter environment. The humidity also rises slightly in November, reaching 92% compared to September’s 88%. For more detailed insights into the weather, check out Gaillimh weather in November.
September and December present contrasting weather patterns. In September, temperatures range from a minimum of 1°C (34°F) to a maximum of 26°C (80°F), with an average of 13°C (56°F). The month experiences relatively lower precipitation, averaging 82 mm (3.2 in) over about 14 days, along with high humidity at 88%. In contrast, December sees colder temperatures, with a minimum of -4°C (24°F) and a maximum of 14°C (57°F), averaging 7°C (45°F). This month experiences increased precipitation, totaling 110 mm (4.3 in) over 17 days, while humidity remains slightly higher at 89%. For more details about December weather conditions, you can visit Gaillimh weather in December.
As summer gently fades, September in Gaillimh brings a unique blend of mild temperatures and increased rainfall, setting it apart from the warmer months. With an average temperature hovering around a comfortable 13°C, the days can still see highs of 26°C, offering a pleasant outdoor experience despite the occasional dip to 1°C during the night. The high humidity of 88% often enhances the cool air, while 82 mm of precipitation over 14 days underscores the transition into autumn. This month embodies a cool and refreshing change, making it a beautiful time to explore the stunning landscapes of the region. For a comprehensive overview of the weather trends throughout the year, check out Gaillimh Climate.