Last updated: August 21, 2025
Copenhagen in September offers a delightful mix of mild temperatures and vibrant autumn hues. With a maximum of 26°C (78°F) and an average of 14°C (58°F), the city enjoys comfortable days that gradually transition into cooler evenings, where the minimum can drop to 3°C (37°F). Despite experiencing 11 days of precipitation, amounting to 79 mm (3.1 in), the city's charm remains intact, enveloped in an average humidity of 83%. This month is ideal for exploring Copenhagen's picturesque streets, as visitors can enjoy the fresh air and the early signs of fall foliage.
As summer gracefully transitions into autumn, Copenhagen in September offers a delightful climate that captures the essence of both seasons. With overnight temperatures dipping to a comfortable 3°C (37°F) and daytime highs reaching a pleasant 26°C (78°F), the month showcases a significant warmth. The average temperature settles at 14°C (58°F), making it ideal for leisurely strolls through the city's enchanting parks or along its iconic waterfront. With hints of cooler air starting to emerge, visitors can enjoy the lingering warmth of summer while also witnessing the beautiful shift in foliage as the autumn colors begin to blossom. This perfect blend of temperatures enhances the charm of Copenhagen, inviting both locals and travelers to savor the city's rich outdoor experiences.
In September, Copenhagen experiences a significant shift in precipitation, with an average of 79 mm (3.1 in) of rain over 11 days. This volume marks a slight decrease from the previous month but is indicative of the city's transition into fall, where wetter conditions often prevail. Following a summer characterized by heavier rainfall in July and August, September's weather hints at the approaching winter while still delivering a refreshing array of autumn showers. As the leaves begin to change, the frequent drizzle adds a touch of charm to the city's ambiance, making it a picturesque time to enjoy the vibrant streets of Copenhagen.
In September, Copenhagen experiences a mild increase in humidity, reaching 83%, a notable rise from the drier summer months of July and August, which both hover around 77%. This change signals the transition into autumn, as the air begins to feel a bit heavier and more moisture-laden. While the humidity levels in September are still significantly lower than the peak winter months, where they soar to 90% in January, this slight uptick reflects the city's shifting climate as it prepares for the cooler months ahead. Overall, the trend indicates a gradual increase in humidity as the year progresses toward winter, enhancing the characteristic crispness of Copenhagen's fall.
As summer gives way to autumn in Copenhagen, September sees the UV Index drop to a moderate 5, signaling a shift in sun exposure patterns. This decline follows the peak of summer, where months like June and July boasted higher indices of 7, indicating a need for vigilant sun protection during midday outdoor activities. With a burn time of 30 minutes, the month calls for mindful time spent in the sun, especially as the warmth begins to wane. Overall, September’s UV Index reflects a seasonal transition, encouraging residents and visitors alike to stay aware of sun safety while enjoying the crisp fall air. For more detailed information, check out the Copenhagen UV Index.
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September in Copenhagen brings a delightful transition into autumn, boasting 317 hours of sunshine. This month stands out as a period where the summer warmth lingers, yet the days begin to shorten. From an impressive peak of 452 hours in June, sunlight gradually wanes, but September's ample rays offer a gentle farewell to summer, inviting residents and visitors alike to savor the city's vibrant outdoor culture. As the days of sunshine decline heading into October, with only 243 hours expected, September serves as a beautiful bridge between the bright, sun-soaked months and the cozy, cooler days ahead.
In September, Copenhagen experiences a 30% chance of sunny weather, marking a subtle decline from the vibrant sunlight of summer. This month sits comfortably between the sunnier spring months, such as April at 53%, and the more temperamental autumn days that follow. Interestingly, the likelihood of clear skies in September remains relatively stable when compared to the previous months, such as August and July, both hovering around the 35% mark. As the city transitions from the warmth of summer to the cooler embrace of fall, residents and visitors alike can expect a blend of sunny days with the occasional overcast skies, making it a charming time to explore the city’s beautiful parks and waterfronts.
As summer gently fades into autumn, September in Copenhagen brings a transition in daylight that reflects the city's shifting seasonal rhythms. With 12 hours of daylight, September marks a noticeable decline from the sun-drenched days of summer, yet still offers a comfortable amount of light for outdoor activities and explorations. This month serves as a bridge between the long, bright days of June and July, which peak at 17 hours, and the more shadowy months that follow. As the days grow shorter, the gradual reduction in daylight highlights the approach of the cozy, introspective season of fall, inviting residents and visitors alike to savor the remaining warmth and beauty of early autumn days.
September in Copenhagen ushers in a gentle breeze, with an average wind speed of 3.9 m/s (approximately 9 mph). This marks a slight decrease from the summer months, where winds averaged around 4.4 m/s in August, bringing a transition into the cooler autumn air. As the city shakes off the warmth of summer, the wind tends to pick up in October, increasing to 5.1 m/s (11 mph), hinting at the vibrant changes that fall brings. Overall, the trend in wind speeds throughout the year showcases a gradual ebb and flow, with Copenhagen's climate shaping a unique atmosphere that reflects the shifting seasons.
Weather in Copenhagen varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Copenhagen, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is generally mild, with temperatures ranging from a minimum of 3°C (37°F) to a pleasant maximum of 26°C (78°F) and an average of 14°C (58°F). The month receives about 79 mm (3.1 in) of precipitation over approximately 11 days, with humidity levels around 83%. In contrast, January experiences significantly colder temperatures, ranging from a minimum of -13°C (9°F) to a maximum of 11°C (52°F), with an average of just 3°C (37°F). Although January sees less precipitation, at 50 mm (2.0 in) over the same number of days, humidity remains high at 90%. For more detailed insights, check out Copenhagen weather in January.
September and February present contrasting weather patterns in terms of temperature and precipitation. In September, temperatures range from a cool 3°C (37°F) at night to a warm 26°C (78°F) during the day, with an average of 14°C (58°F). The month receives 79 mm (3.1 in) of precipitation over 11 days, accompanied by a humidity level of 83%. In stark contrast, February is notably colder, with temperatures dipping to a minimum of -11°C (12°F) and reaching a maximum of 13°C (56°F), leading to an average of just 2°C (36°F). Precipitation in February is lighter at 48 mm (1.9 in) over 10 days, but the humidity is slightly higher, at 89%. For more detailed information, check out Copenhagen weather in February.
In September, Copenhagen experiences milder weather, with average temperatures ranging from a chilly 3°C (37°F) at night to a comfortable 26°C (78°F) during the day. In contrast, March is significantly colder, with night temperatures dropping to as low as -10°C (14°F) and an average daytime temperature of only 4°C (39°F). While September sees more rainfall at 79 mm (3.1 in) across 11 days, March is slightly drier with 64 mm (2.5 in) over 12 days, though the humidity remains high at 88%. For a closer look at what to expect, visit Copenhagen weather in March.
When comparing the weather in September and April, notable differences emerge. September boasts milder temperatures, with a minimum of 3°C (37°F) and an average high of 26°C (78°F), while April experiences cooler conditions, ranging from a minimum of -5°C (23°F) to an average maximum of 22°C (73°F). In terms of precipitation, September receives significantly more rainfall at 79 mm (3.1 in) across 11 days, compared to April’s 35 mm (1.4 in) over 8 days. Humidity levels are quite similar, sitting at 83% in September and 85% in April, creating a generally damp atmosphere during both months. For more detailed insights on April conditions, you can visit Copenhagen weather in April.
When comparing the weather in September and May, one can see notable differences in temperature and precipitation. September features a broader temperature range, with a minimum of 3°C (37°F), an average of 14°C (58°F), and a maximum of 26°C (78°F). In contrast, May has slightly cooler temperatures, ranging from a minimum of 0°C (32°F) to a maximum of 28°C (82°F) with an average of 12°C (54°F). Additionally, September experiences more precipitation, totaling 79 mm (3.1 in) over 11 days, while May sees less rain, with 53 mm (2.1 in) across 12 days. Humidity levels are similar, with September at 83% and May at 80%. For more specific details about May's weather, you can visit Copenhagen weather in May.
September and June present contrasting weather patterns in terms of temperature and precipitation. In September, temperatures range from a chilly minimum of 3°C (37°F) to a maximum of 26°C (78°F), with an average of 14°C (58°F). The month also sees relatively high precipitation levels at 79 mm (3.1 in) over approximately 11 days, accompanied by a humidity rate of 83%. In comparison, June enjoys warmer conditions, with temperatures ranging from a minimum of 7°C (45°F) to a maximum of 30°C (87°F), and an average of 17°C (63°F). Precipitation is lower in June at 45 mm (1.8 in) over about 7 days, with humidity slightly lower at 77%. For more detailed information, you can check Copenhagen weather in June.
September and July present distinctly different weather patterns. In September, temperatures range from a cooler minimum of 3°C (37°F) to a comfortable maximum of 26°C (78°F), with an average temperature of 14°C (58°F). The month sees approximately 79 mm (3.1 in) of precipitation over 11 days and experiences relatively high humidity at 83%. In contrast, July boasts warmer temperatures, with a minimum of 7°C (44°F), an average of 18°C (64°F), and a peak of 31°C (88°F). Precipitation in July is slightly lower at 74 mm (2.9 in) over 12 days, accompanied by a humidity level of 77%. For more insights into July's climate, visit Copenhagen weather in July.
In comparing the weather between September and August, we see a noticeable shift in temperatures and conditions. September experiences a cooler temperature range, with minimums dropping to 3°C (37°F) and maximums reaching only up to 26°C (78°F), compared to August's milder minimum of 7°C (44°F) and maximum of 30°C (87°F). Precipitation levels are relatively close, with September recording 79 mm (3.1 in) across 11 days, while August sees slightly higher rainfall at 89 mm (3.5 in) over 13 days. Additionally, September has a higher humidity level at 83%, compared to August’s 77%. For more detailed insights, you can check Copenhagen weather in August.
September typically showcases warmer temperatures, with averages around 14°C (58°F) and highs reaching up to 26°C (78°F). In contrast, October sees a distinct drop, featuring an average temperature of 11°C (51°F) and maximums of 20°C (68°F). While both months experience notable precipitation—79 mm (3.1 in) in September and 83 mm (3.3 in) in October—October has slightly more rain spread over more days, totaling 15 days of precipitation compared to September's 11. Additionally, humidity rises from 83% in September to 87% in October, contributing to a cooler and more moisture-laden atmosphere. For more detailed insights, check out Copenhagen weather in October.
In September, the weather is generally warmer with temperatures ranging from a minimum of 3°C (37°F) to a maximum of 26°C (78°F), accompanied by an average temperature of 14°C (58°F). The month sees a fair amount of precipitation, totaling 79 mm (3.1 in) over 11 days, and a relative humidity of 83%. In contrast, November brings much cooler temperatures, with a minimum of -6°C (22°F) and an average of 7°C (44°F), peaking at 17°C (63°F). Precipitation decreases to 44 mm (1.7 in) over 10 days, and humidity rises slightly to 89%. For more details on the climate, you can visit Copenhagen weather in November.
In September, Copenhagen experiences mild weather, with temperatures ranging from a minimum of 3°C (37°F) to a maximum of 26°C (78°F) and an average of 14°C (58°F). The month is relatively humid at 83% and sees about 79 mm (3.1 in) of precipitation over 11 days. In contrast, December brings a stark change, with much colder temperatures, dipping as low as -7°C (19°F) and averaging around 4°C (39°F). Despite a lower total precipitation of 61 mm (2.4 in) spread over 15 days, the humidity rises slightly to 88%. For more details on the December climate, check out Copenhagen weather in December.
As summer transitions into fall, Copenhagen's weather in September showcases a delightful blend of warmth and cool breezes, setting it apart from the sweltering heat of July and August. Visitors can expect comfortable averages around 14°C (58°F), with the occasional warm day reaching 26°C (78°F), offering a pleasant escape from the cold as winter approaches. However, the month also brings increased rainfall with about 79 mm (3.1 in) spread over 11 days, making it one of the wetter periods of the year. Coupled with a humidity level of 83%, September presents a refreshing yet slightly damp atmosphere, inviting you to explore the vibrant city while preparing for the enchanting fall colors. For more in-depth information on weather trends, check out Copenhagen Climate.