Last updated: March 17, 2025
October in Portmarnock, Ireland brings a blend of cool temperatures and rhythmic rainfall, setting a classic autumn scene. With daytime highs peaking at 19°C (67°F) and an average of 11°C (53°F), the weather shifts dramatically as nights can dip to a brisk 2°C (36°F). Expect 13 days of precipitation, totaling about 79 mm (3.1 in), contributing to the region's lush, green landscapes. Coupled with a high humidity level of 87%, the month encapsulates the essence of Irish weather—mysterious and ever-changing, perfect for cozy gatherings or tranquil walks by the coast.
In October, Portmarnock experiences a gentle transition toward the chillier months, with temperatures ranging from a minimum of 2°C (36°F) to a pleasant maximum of 19°C (67°F). The average temperature settles around 11°C (53°F), offering a comfortable backdrop for autumn activities. Compared to the warmer summer months, October sees a notable drop, with the average temperature dipping considerably from September’s 14°C (57°F). This shift marks the beginning of cooler evenings and a crispness in the air, accentuating the beauty of the surrounding landscapes as leaves begin to change. October in Portmarnock can be both refreshing and invigorating, making it an ideal time for scenic walks along the coast, wrapped in a cozy sweater.
In October, Portmarnock experiences notable precipitation, with an average of 79 mm (3.1 in) of rainfall over approximately 13 days. This amount marks a slight increase from September's 70 mm, indicating that the transition into autumn brings a bit more moisture to the region. As the month progresses, the days become increasingly wet, setting the stage for the wetter months ahead. Compared to the previous months, October's rainfall is substantial, yet it remains lower than the peak wetness of August, which recorded 95 mm. This trend showcases a typical pattern in Portmarnock, where late summer rainfall gives way to a wetter fall, hinting at the approaching winter season.
In October, Portmarnock experiences a slight rise in humidity, reaching 87%, the highest level of the year. This increase follows a consistent trend seen throughout the late summer and early autumn months, where humidity hovers between 85% and 86%. As the year transitions from September's 86%, this gradual shift towards higher humidity levels signals the approach of winter, creating a characteristic dampness in the air. Notably, October maintains this trend, aligning closely with the overall yearly pattern, yet stands out as a reminder of Ireland's unpredictable weather, where the sea's influence keeps conditions relatively moist and cool.
As October unfolds in Portmarnock, Ireland, the UV Index settles at a moderate 3, signaling a shift in our sun exposure habits. After the vibrant peak of summer months, where the index soared to 8, the cooler autumn days prompt a welcome decrease in burn time to a more manageable 30 minutes. This trend shows a gradual transition from high to moderate levels of UV radiation, with October's index nestled comfortably in the middle. While it's important to remain vigilant, the lower UV levels offer a reprieve, making outdoor activities a bit safer without compromising fun. For more detailed information on UV exposure throughout the year, check out Portmarnock UV Index.
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As autumn blankets Portmarnock, October offers a delightful contrast with 226 hours of sunshine, standing proudly against the waning days of summer. While this month showcases a notable decrease from the sun-drenched heights of May and June, it still shines brighter than the chilly depths of November and December. This moderate sunshine acts as a gentle farewell to the vibrant summer months, hinting at the impending winter while reminding locals and visitors alike of the fleeting beauty of the season. The gradual decline of daylight hours becomes a canvas for cozy evenings, as golden hues drift into the landscape, making October a uniquely charming time to embrace the picturesque coastal scenery of Ireland.
In Portmarnock, Ireland, October offers a modest 20% chance of sunny weather, marking a decline from the somewhat sunnier months of spring, when the likelihood peaks at 44% in April. This trend of diminishing sunlight continues as summer fades, with September’s chances dropping to 21%. While October may not boast the sunniest days, the refreshing autumn atmosphere and the beautiful changing leaves can still make it a charming time to explore the coast and enjoy the unique beauty of this seaside town.
In Portmarnock, October marks a transition as daylight begins to dwindle, offering approximately 10 hours of sunlight— a notable decrease from the sun-drenched heights of summer, where July and June bask in 16 hours of daylight. This gradual reduction is part of a clear pattern throughout the year; from the early brightness of spring, peaking in May with 15 hours, to the dimming winter months where November and December see merely 8 and 7 hours, respectively. As autumn sets in, October’s daylight serves as a gentle reminder of the shifting seasons, leading us toward the cozy embrace of winter.
As autumn settles in Portmarnock, October greets us with an invigorating average wind speed of 4.8 m/s (11 mph), signaling a shift from the summer's calm breezes. This increase reflects a broader trend seen throughout the year, where wind speeds generally rise from the gentle gusts of July, which average only 2.8 m/s (6 mph). After a series of relatively low averages in spring and summer, October's winds begin to mirror those of the earlier months, with a marked increase as the season cools. Notably, this wind speed aligns closely with November, hinting at a consistent weather pattern that brings a brisk, refreshing air to the coastal landscape, inviting residents and visitors alike to embrace the beauty of the season.
The weather in Portmarnock changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of October's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Portmarnock and find detailed weather information for every month.
In October, temperatures start to cool down with a minimum of 2°C (36°F) and an average of 11°C (53°F), reaching a maximum of 19°C (67°F). The month is characterized by relatively high humidity at 87%, along with 79 mm (3.1 in) of precipitation spread over 13 days. In contrast, January experiences colder conditions, with temperatures dipping to a minimum of -3°C (27°F) and an average of 6°C (43°F), peaking at 14°C (58°F). The month receives less precipitation, totaling 53 mm (2.1 in) over 10 days, while humidity is slightly lower at 85%. For a more detailed look at January's weather, you can visit Portmarnock weather in January.
October and February present distinct weather patterns. In October, temperatures range from a cool 2°C (36°F) to a mild 19°C (67°F), with an average of 11°C (53°F). This month sees around 79 mm (3.1 in) of precipitation over 13 days, coupled with a high humidity level of 87%. In contrast, February experiences colder temperatures, with lows of -2°C (29°F) and highs reaching 15°C (58°F), averaging 7°C (44°F). Precipitation is slightly lower at 73 mm (2.9 in) spread over 14 days, with humidity levels at 86%. For more details on February weather, you can visit Portmarnock weather in February.
October and March exhibit notable differences in weather patterns, with October generally being milder. In October, temperatures range from a minimum of 2°C (36°F) to a maximum of 19°C (67°F), with an average of 11°C (53°F). The month also experiences around 79 mm (3.1 in) of precipitation over 13 days, while humidity sits at a high 87%. In contrast, March features cooler temperatures, starting from a low of -3°C (26°F) and peaking at 16°C (62°F), with an average of 7°C (45°F). Precipitation levels are slightly lower at 73 mm (2.9 in) spread over 14 days and a comparable humidity of 86%. For more detailed information, you can check Portmarnock weather in March.
When comparing October and April weather, both months share a maximum temperature of 19°C (67°F), but they differ significantly in their other metrics. In October, the average temperature is slightly warmer at 11°C (53°F), while April averages a cooler 9°C (48°F). Notably, October experiences higher precipitation, with 79 mm (3.1 in) over approximately 13 days, compared to April's 44 mm (1.7 in) across 11 days. Humidity levels are also similar, with October at 87% and April at 85%. For more detailed insights on Portmarnock's weather during April, you can check Portmarnock weather in April.
When comparing the weather in October and May, October tends to be cooler with average temperatures ranging from 2°C (36°F) to a maximum of 19°C (67°F), while May experiences a slightly warmer range from 1°C (34°F) to 22°C (72°F). Precipitation is more substantial in October, totaling 79 mm (3.1 in) over 13 days, compared to May's 62 mm (2.4 in) over 12 days. Humidity is also marginally higher in October at 87%, compared to May's 83%. For a more detailed look at May's weather specifics, you can refer to Portmarnock weather in May.
When comparing the weather in October to that of June, notable differences emerge. October experiences cooler temperatures, with a minimum of 2°C (36°F) and an average of 11°C (53°F), while June boasts milder conditions, starting with a minimum of 7°C (44°F) and an average of 15°C (58°F). The maximum temperatures also reflect this contrast, as October peaks at 19°C (67°F) compared to June's more comfortable high of 25°C (77°F). Additionally, while both months receive precipitation over 13 days, October has a slightly higher rainfall at 79 mm (3.1 in) versus June's 69 mm (2.7 in). Humidity levels are fairly consistent, with October at 87% and June slightly lower at 85%. For more detailed insights, check out Portmarnock weather in June.
When comparing the weather in October and July, notable differences emerge. October sees cooler temperatures, with a minimum of 2°C (36°F) and an average of 11°C (53°F), while July enjoys warmer conditions, featuring a minimum of 8°C (47°F) and an average of 16°C (62°F), peaking at 27°C (80°F). Precipitation is slightly higher in October at 79 mm (3.1 in) over approximately 13 days, compared to July’s 73 mm (2.9 in) over 12 days. Humidity levels remain fairly similar, with October at 87% and July at 86%. For more insights into July weather, you can visit Portmarnock weather in July.
In comparing the weather between October and August, October tends to be cooler with average temperatures ranging from a low of 2°C (36°F) to a high of 19°C (67°F), while August enjoys milder temperatures from 8°C (47°F) to 23°C (74°F). August also experiences slightly less precipitation, at 95 mm (3.7 in) over 16 days, compared to October's 79 mm (3.1 in) across 13 days. Humidity levels are fairly similar, with October at 87% and August just a touch lower at 85%. For a detailed look at August weather in Portmarnock, visit Portmarnock weather in August.
In October, temperatures take a noticeable dip compared to September, with a minimum of 2°C (36°F) and an average of 11°C (53°F), down from September's minimum of 4°C (39°F) and average of 14°C (57°F). The maximum temperatures also reflect this cooling trend, with October reaching up to 19°C (67°F) compared to September's warmer peak of 22°C (72°F). While both months experience similar precipitation days—13 days of rain—the total rainfall in October is slightly higher at 79 mm (3.1 in) versus September's 70 mm (2.7 in). Additionally, humidity levels remain comparably high, with October at 87% and September at 86%. For further details on September weather, check out Portmarnock weather in September.
October and November present a noticeable shift in weather as autumn progresses. In October, the temperatures range from a minimum of 2°C (36°F) to a maximum of 19°C (67°F), with an average of 11°C (53°F). The month experiences about 79 mm (3.1 in) of precipitation over 13 days, alongside a relatively high humidity of 87%. By November, temperatures drop slightly, with minimums around -1°C (31°F) and maximums reaching 15°C (60°F), leading to an average of 8°C (48°F). The precipitation increases to 93 mm (3.6 in) across 14 days, and humidity remains slightly lower at 86%. For more detailed weather insights, visit Portmarnock weather in November.
October and December present a noticeable shift in weather patterns. In October, temperatures range from a mild 2°C (36°F) to a pleasant average of 11°C (53°F), peaking at 19°C (67°F), while precipitation measures 79 mm (3.1 in) over approximately 13 days, accompanied by high humidity at 87%. In contrast, December experiences cooler temperatures, with a minimum of -2°C (30°F) and an average of 7°C (45°F), capped at a maximum of 13°C (56°F). The month sees slightly higher precipitation at 85 mm (3.4 in) over about 14 days, though humidity drops slightly to 84%. For more detailed insights, you can check Portmarnock weather in December.
As October settles in Portmarnock, the weather takes on a distinct character compared to the preceding months. Temperatures exhibit a noticeable drop, with cooler days and brisk nights, making it feel quite different from the warmth of summer. Rain becomes a more frequent visitor, as precipitation spreads across about half the month, often drenching the landscape in lush greens. The high humidity levels add a chill to the air, reminding residents and visitors that autumn is firmly in place. For those wanting to better understand the shift in climate, details can be found at Portmarnock Climate.