Last updated: March 17, 2025
August in Belfast, United Kingdom brings a delightful blend of warm temperatures and occasional rainfall. With a maximum temperature reaching 22°C (71°F) and an average of 15°C (59°F), the month invites residents and visitors alike to enjoy outdoor activities, despite a minimum dip to 8°C (46°F). However, prepare for the wet weather, as August sees 115 mm (4.5 in) of precipitation spread over 19 days, resulting in a humidity level of 86%. Whether you're exploring the city’s vibrant culture or relaxing in its lush surroundings, staying flexible with plans will ensure a rewarding experience in this lively summer month.
In August, Belfast enjoys a mild transition into late summer, with temperatures reflecting a comfortable range. The month sees a minimum of 8°C (46°F) and peaks at a pleasant 22°C (71°F), with an average hovering around 15°C (59°F). Compared to the earlier summer months, this slight dip still maintains a warm atmosphere, ideal for exploring the city's vibrant culture and lush landscapes. As a precursor to autumn, the temperatures begin to trend downwards, mirroring the gradual shift in the season, making August an inviting time to experience Belfast before the chill of September sets in.
August in Belfast marks a peak in precipitation, with an impressive 115 mm (4.5 in) of rain spread over 19 days. This surge makes it notably the wettest month of the year, illustrating a significant increase compared to previous months. Following a trend of gradual precipitation growth from the dry spell of April (45 mm) through the mildly wet summer months of June (78 mm) and July (84 mm), August’s rainfall emphasizes the region's transition from summer warmth to the more autumnal weather ahead. As the city welcomes late summer showers, residents and visitors alike should prepare for the frequent rain that characterizes this vibrant month.
Throughout the year, Belfast experiences consistently high humidity levels, but August stands out with 86% humidity, matching the preceding month of July. This pattern is part of a gradual decline from the nearly oppressive figures of mid-winter, where humidity peaks at 90% in November, after a brief dip to 82% in May. As summer wanes, humidity levels remain elevated, creating a moist atmosphere that characterizes the British Isles' weather. Following August, humidity begins to increase again in September, reinforcing a trend of lingering dampness as the city heads into fall. This consistent humidity pattern not only affects daily comfort but also influences the lush verdure that Belfast is known for.
In August, Belfast experiences a UV Index of 6, indicating a high exposure category with a burn time of approximately 25 minutes. This marks a noticeable drop from the intense very high levels seen in the preceding months of June and July, where the UV Index peaked at 8. As summer begins to wane, the UV levels remain significant but are more manageable than during the peak of the summer months. Consequently, while outdoor activities can still be enjoyed, it's prudent to take sun protection measures to avoid overexposure. For detailed information on UV levels throughout the year, visit Belfast UV Index.
UV Risk Categories
August in Belfast graces the city with 349 hours of sunlight, marking a vibrant continuation of the summer season. As the warm months unfold, there’s a notable rise from just 81 hours in January to a peak of 403 hours in May, followed by a slight decline in June and July, remaining robust in August. While it may not reach the heights of spring, this amount of sunshine invites both locals and visitors to enjoy the charm of the city before the gradual transition to cooler, cloudier days in September. As autumn approaches, the twilight of summer reminds us of the bright warmth we've cherished, while the promise of coziness awaits in the months ahead.
In Belfast, the likelihood of sunny weather in August tends to be on the lower side, with only a 21% chance of sunshine. This places August towards the tail end of the summer months, showing a slight decline from the sunnier days of April (42%) and May (33%). Interestingly, the trend reflects the seasonal ebb and flow of sunshine, as the city tends to enjoy brighter days earlier in the summer. While August certainly has its share of warm days, it’s essential for visitors and locals alike to embrace the ever-changing skies typical of this charming city, reminding us that in Belfast, the sun can be as elusive as it is cherished.
As August unfolds in Belfast, daylight begins to gracefully wane from the peak summer brightness, offering about 14 hours of sunlight each day. This marks a slight decline from July's impressive 16 hours, reminding us of the changing seasons. The gradual decrease in daylight is a transition from the late spring and summer months, which boast the longest days, to the shorter, cozy hours of autumn. In comparison to the earlier months of the year, where daylight grows from a mere 7 hours in January to a vibrant 17 hours in June, August serves as a beautiful juxtaposition, blending the remnants of summer with the impending arrival of autumn's shorter days.
In Belfast, the winds of August breeze gently at an average speed of 3.2 m/s (7 mph), reflecting a slight lull compared to the more blustery winter months. As summer peaks, the gusts are notably lighter than earlier in the year, with July recording its calmest winds at 2.6 m/s (6 mph). This trend of diminishing winds carries through to the end of summer, as September sees a mild increase to 3.4 m/s (8 mph), signaling a transition back to the more robust winds of autumn. Overall, the August winds, while softer, contribute to the vibrant atmosphere of the season, perfect for leisurely strolls along the coastal paths or enjoying outdoor gatherings.
The weather in Belfast changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of August's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Belfast and find detailed weather information for every month.
In August, the weather in Belfast is considerably milder, with average temperatures ranging from a minimum of 8°C (46°F) to a maximum of 22°C (71°F). The month experiences higher humidity at 86% and more precipitation, totaling 115 mm (4.5 in) over 19 days. In contrast, January features colder conditions, with temperatures dropping to a minimum of -4°C (26°F) and a maximum of 14°C (57°F). While January has lower precipitation at 60 mm (2.3 in) across just 10 days, the humidity remains similar at 87%. For a detailed overview, you can check Belfast weather in January.
When comparing the weather in August and February, significant differences emerge. August tends to be warmer, with average temperatures ranging from a mild 15°C (59°F) to a maximum of 22°C (71°F), while February experiences much cooler conditions, with averages around 6°C (43°F) and a maximum of 13°C (56°F). Precipitation is more frequent in August, occurring on 19 days and totaling 115 mm (4.5 in), compared to February's 89 mm (3.5 in) over 14 days. Despite the differences in temperature and precipitation, both months share a high humidity level of 86%. For a more detailed look at February conditions, you can visit Belfast weather in February.
August and March showcase contrasting weather patterns, with August typically being warmer and wetter. In August, temperatures range from a minimum of 8°C (46°F) to a maximum of 22°C (71°F), while March experiences lower averages, with temperatures ranging from -3°C (27°F) to 16°C (60°F). Precipitation is also more pronounced in August, with 115 mm (4.5 in) falling over 19 days, compared to March's 80 mm (3.2 in) over 16 days. Both months share a high humidity level of 86%, but the overall feel of the weather differs significantly. For more detailed insights, check out Belfast weather in March.
When comparing the weather in August and April, several notable differences emerge. August typically sees a milder temperature range, with minimums around 8°C (46°F) and maximums reaching 22°C (71°F), while April can be quite cool, with minimums dipping to -1°C (31°F) and maximums only reaching 18°C (65°F). Precipitation levels also vary significantly; August experiences wetter conditions with an average of 115 mm (4.5 in) over 19 days, compared to April's more moderate 45 mm (1.8 in) spread over just 10 days. Humidity levels remain relatively similar between the two months, with August at 86% and April slightly lower at 85%. For more specific details about the weather in April, you can visit Belfast weather in April.
When comparing the weather of August and May, it's clear that August tends to be a warmer and wetter month. In August, temperatures range from a minimum of 8°C (46°F) to a maximum of 22°C (71°F), with an average of 15°C (59°F) and a higher humidity level of 86%. Additionally, August experiences about 115 mm (4.5 inches) of precipitation over 19 days. In contrast, May sees cooler temperatures with a minimum of 1°C (34°F) and an average of 11°C (52°F), while also reaching a similar maximum of 22°C (71°F). Precipitation in May totals 66 mm (2.6 inches) over 13 days, and the humidity is slightly lower at 82%. For a closer look at the specific weather conditions during May, you can visit this link: Belfast weather in May.
When comparing the weather in August and June, it's clear that while both months are generally mild, they exhibit distinct characteristics. August tends to be slightly warmer, with average temperatures reaching 15°C (59°F) and maximums of 22°C (71°F), compared to June's max of 26°C (79°F) but a lower average of 14°C (57°F). Interestingly, August experiences more precipitation, with 115 mm (4.5 in) falling over 19 days, whereas June has a lesser amount of 78 mm (3.1 in) over 14 days. Humidity levels are quite similar, with August at 86% and June at 84%. For a closer look at the weather specifics, you can check out Belfast weather in June.
Comparing the weather in July and August reveals some notable differences. In July, temperatures range from a minimum of 8°C (47°F) to a maximum of 26°C (78°F), with an average of 15°C (60°F). The month experiences less rainfall, totaling 84 mm (3.3 in) over 14 days. In contrast, August brings cooler maximum temperatures, peaking at 22°C (71°F) while maintaining the same minimum of 8°C (46°F) and an average of 15°C (59°F). Precipitation increases significantly to 115 mm (4.5 in) over 19 days, suggesting a wetter month despite similar humidity levels of 86%. For more detailed information on July weather, you can visit Belfast weather in July.
In August, temperatures range from a minimum of 8°C (46°F) to a maximum of 22°C (71°F), with an average temperature of 15°C (59°F). The month sees substantial rainfall, totaling 115 mm (4.5 in) over 19 days, and humidity levels are quite high at 86%. In contrast, September experiences a slight drop in temperatures, with a minimum of 4°C (39°F) and an average of 13°C (56°F), while the maximum remains similar at 21°C (71°F). Precipitation decreases to 75 mm (3.0 in) over 15 days, and humidity slightly rises to 88%. For more detailed insights, you can check Belfast weather in September.
August and October showcase distinct differences in weather patterns. August typically enjoys milder temperatures, with averages around 15°C (59°F) and highs reaching 22°C (71°F), while October experiences cooler conditions, with an average of 11°C (52°F) and maximums of 18°C (65°F). In terms of precipitation, August sees more rain, totaling 115 mm (4.5 in) across 19 days, compared to October's 92 mm (3.6 in) over 15 days. Additionally, humidity levels are slightly higher in August at 86%, while October registers at 89%. Overall, August feels warmer and wetter, whereas October presents a chillier, yet slightly drier climate. For more details, check Belfast weather in October.
August and November showcase distinct differences in weather patterns. In August, temperatures range from a minimum of 8°C (46°F) to a maximum of 22°C (71°F), with an average of 15°C (59°F). The month is characterized by higher precipitation, totaling 115 mm (4.5 in) over 19 days, and humidity levels of 86%. In contrast, November experiences cooler temperatures, with a minimum of 0°C (32°F), an average of 8°C (47°F), and a maximum of 15°C (59°F). Precipitation decreases to 94 mm (3.7 in) over 15 days, while humidity rises slightly to 90%. For more detailed insights, you can explore Belfast weather in November.
In August, the weather is generally milder with average temperatures ranging from a minimum of 8°C (46°F) to a maximum of 22°C (71°F), accompanied by significant precipitation of 115 mm (4.5 in) over 19 days. In contrast, December sees much colder temperatures, with an average ranging from -1°C (30°F) at night to a maximum of 13°C (56°F) during the day. Although December has a slightly lower total precipitation of 91 mm (3.6 in) over 15 days, the humidity remains high at 86%, similar to August. For more detailed weather information, you can visit Belfast weather in December.
August in Belfast marks a subtle shift in the city's weather patterns as summer begins to wane. With temperatures reaching up to 22°C (71°F), this month is notably warmer than what you’ll find in the cooler months ahead. However, it also presents a higher likelihood of rain, as evidenced by frequent precipitation on 19 days—a noticeable increase compared to the drier spells of June and July. The humidity, peaking at 86%, adds to the slightly muggy feel, making it essential to pack an umbrella along with your summer attire. For a deeper dive into what to expect throughout the year, check out Belfast Climate.