Last updated: August 21, 2025
In September, Sisimiut, Greenland experiences a shift in seasonal dynamics, characterized by a maximum temperature of 9°C (49°F) and an average of 3°C (37°F), dipping to a minimum of -4°C (25°F). This month sees approximately 53 mm (2.1 in) of precipitation spread across 10 days, contributing to the region's 85% humidity. As autumn progresses, the weather becomes increasingly brisk, providing a unique atmosphere for both locals and visitors to explore the breathtaking landscapes of this Arctic town.
In September, temperatures in Sisimiut, Greenland begin to show the first hints of autumn's chill. The month sees temperatures range from a minimum of -4°C (25°F) to a pleasant average of 3°C (37°F), with daytime highs reaching up to 9°C (49°F). Compared to the warmer summer months, September marks a notable transition, as the landscape starts to prepare for the coming frost. The cool, crisp air combined with the last remnants of summer creates a unique atmosphere, making it an intriguing time to experience the natural beauty of this Arctic region. As the month progresses, the decline in temperatures sets the stage for the snowy embrace of winter that follows closely behind.
In September, Sisimiut, Greenland, experiences a transition in weather, with an average precipitation amount of 53 mm (2.1 in). This marks a slight decrease from the previous month, but still showcases a notable balance in rainfall amidst the approaching autumn. Over 10 days of the month, the town sees precipitation, making September a relatively damp period while remaining consistent with the patterns established in July and August. Compared to the winter months, where precipitation is generally lower, September stands out as part of a wetter season that peaks leading into autumn, effectively bridging summer's end with the rains of fall.
September in Sisimiut, Greenland, sees a notable shift in humidity, where levels average around 85%. This marks a slight dip from the peak summer months, which feature humidity levels around 81-89%. As the year transitions from the warm embrace of summer to the cooler autumn months, the humidity tends to stabilize. Interestingly, the trend reveals that the fall months are generally less humid compared to the early winter, with the humidity in September being lower than the January average of 96%. Overall, Sisimiut's September serves as a gentle reminder of the changing seasons, with a comfortable humidity level that prepares the atmosphere for the winter chill ahead.
In September, Sisimiut, Greenland experiences a moderate UV Index of 3, which indicates a 30-minute burn time for unprotected skin. As summer transitions to autumn, this marks a gradual decline in UV exposure, following the peak of June's high index of 6. The UV Index in September reflects a notable shift from the summer months, making it essential for residents and visitors to stay vigilant about sun protection, albeit with a relatively less intense exposure than the midsummer. Historically, this month is part of a broader pattern where UV levels rise from the depths of winter and gradually decrease as winter creeps in again. For more detailed insights, visit the Sisimiut UV Index.
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As summer gives way to autumn in Sisimiut, Greenland, September offers a beautiful transition marked by 229 hours of sunlight. Following the sun-drenched months of June and July, where daylight reigns supreme with over 330 hours, the daylight begins to wane but still holds on to a significant glow. The gradual decrease from the high of 356 hours in May to September's 229 hours reveals a clear shift, yet this month still boasts considerably more sunlight than the stark winter months that follow. With each passing day, the golden hues of early autumn illuminate the rugged landscape, inviting residents and visitors alike to celebrate the last remnants of warmth before the long winter sets in. As October approaches, the sunlight tally will drop sharply to just 136 hours, emphasizing the fleeting nature of this late summer glow.
In Sisimiut, Greenland, September stands out as a delightful month for sun-seekers, boasting a 57% chance of sunny weather. This significant increase in sunshine compared to the summer months—where July offers only a 35% chance and August declines to 19%—highlights a trend of late-summer brightness. As the season transitions into autumn, September's sunshine becomes a welcome anomaly in a year marked by more overcast days, making it an ideal time for outdoor exploration in this stunning Arctic landscape. Whether you're hiking or simply soaking in the views, the heightened likelihood of sunny skies makes September an inviting month to experience the natural beauty of Sisimiut.
As September unfolds in Sisimiut, Greenland, the length of daylight begins to wane, providing a gentle transition from the vibrant summer months to the crispness of autumn. With about 13 hours of sunlight, September offers a balance of light and shadow, contrasting sharply with the nearly 24 hours of daylight experienced in June. This gradual decrease represents a shift away from the summer's brightness, as the townsfolk and visitors alike savor the lingering warmth of the sun while it lasts. Looking back at the seasonal progression, it's clear how dramatically daylight hours have evolved, starting from the meager 6 hours in January to the more generous daylight of spring and summer, and now retreating once again. Each month paints a unique picture of life in this Arctic town, highlighting the rhythm of nature and the beauty of change.
As September unfolds in Sisimiut, Greenland, the wind takes on a gentle demeanor, with an average speed of 4.0 m/s (9 mph). This marks a slight decrease from the summer months, where breezy conditions lingered at 4.4 m/s (10 mph) in August. The transition to autumn brings a subtle shift, reminiscent of the cool breaths that precede winter's embrace. Interestingly, wind speeds in September align closely with the lower averages seen in February and April, illustrating a trend of moderation as nature prepares for the colder months ahead. Overall, the winds of September still whisper the lingering essence of summer while hinting at the crispness to come.
Weather in Sisimiut varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sisimiut, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January exhibit stark contrasts in weather patterns. In September, temperatures vary from a chilly -4°C (25°F) at night to a milder average of 3°C (37°F) during the day, with a maximum reaching 9°C (49°F). The month sees about 53 mm (2.1 in) of precipitation across approximately 10 days, accompanied by high humidity levels at 85%. Conversely, January brings a much harsher climate, with temperatures plummeting between -23°C (-8°F) at night and an average of -12°C (11°F) during the day, peaking at just 2°C (37°F). Precipitation in January is slightly lower at 49 mm (1.9 in), spread over 12 days, while humidity escalates to a damp 96%. For a more detailed look at January weather, visit Sisimiut weather in January.
September and February in Sisimiut offer strikingly different weather experiences. September brings milder temperatures, ranging from a minimum of -4°C (25°F) to a maximum of 9°C (49°F), with an average temperature of 3°C (37°F). During this month, there's also more precipitation, totaling 53 mm (2.1 in), and the humidity is relatively lower at 85%. In contrast, February presents a harsher climate, characterized by significantly colder temperatures that can drop to a minimum of -30°C (-21°F) and only reach a maximum of -3°C (27°F), averaging -17°C (2°F). Precipitation is lighter, at just 19 mm (0.8 in) over about 5 days, while humidity increases to 93%. For more detailed insights on February weather, check out Sisimiut weather in February.
In comparing the weather patterns of September and March, a significant contrast emerges. September boasts milder temperatures, with averages around 3°C (37°F) and highs reaching 9°C (49°F), while March is much colder, with average temperatures around -13°C (8°F) and maximums barely reaching 0°C (32°F). Precipitation levels are relatively similar, with September receiving 53 mm (2.1 in) and March slightly less at 44 mm (1.8 in), each experiencing about 10 days of rainfall or snowfall. Humidity is notably higher in March at 94%, compared to September's 85%, contributing to a much chillier feel during the late winter month. For more detailed insights, you can check the Sisimiut weather in March.
When comparing the weather in September and April, notable differences emerge. September typically experiences milder temperatures, with a minimum of -4°C (25°F) and an average of 3°C (37°F), while April can feel significantly colder, with temperatures dropping as low as -20°C (-3°F) and an average of -6°C (21°F). Both months receive a similar amount of precipitation, approximately 53 mm (2.1 in) in September and 51 mm (2.0 in) in April, each with rain occurring on about 10 days. However, humidity levels are slightly higher in April at 89% compared to September's 85%. For more detailed information, you can visit Sisimiut weather in April.
When comparing the weather in September and May, it's evident that both months experience cool temperatures, but September is generally milder. In September, the average temperature hovers around 3°C (37°F), with a minimum of -4°C (25°F) and a maximum of 9°C (49°F). The month sees about 53 mm (2.1 in) of precipitation over 10 days, with humidity levels at 85%. In contrast, May tends to be colder, with an average temperature of -1°C (31°F), ranging from a minimum of -11°C (12°F) to a maximum of 9°C (48°F). Precipitation in May is significantly lower at 21 mm (0.8 in) over just 4 days, and the humidity is slightly higher at 87%. For more specific details on May weather, you can check Sisimiut weather in May.
In comparing the weather of September and June, both months exhibit similar average temperatures, hovering around 3°C (37°F) to 3°C (38°F). However, September experiences slightly cooler maximum temperatures, capped at 9°C (49°F), while June can reach up to 12°C (54°F). Precipitation is more frequent in September, with rain expected over 10 days and a total of 53 mm (2.1 in), compared to June's 35 mm (1.4 in) over 9 days. Additionally, humidity levels are relatively high in both months, but September's 85% slightly exceeds June's 82%. For more details on June's weather, you can refer to Sisimiut weather in June.
When comparing the weather in September to July, notable differences emerge. September experiences slightly cooler temperatures, with an average of 3°C (37°F) compared to July's average of 6°C (43°F). The maximum temperature in September reaches only 9°C (49°F), while July can warm up to 14°C (57°F). Precipitation also varies, with September receiving 53 mm (2.1 in) over approximately 10 days, while July sees a higher total of 80 mm (3.2 in) across 11 days. Humidity levels are relatively similar, with September at 85% and July at 81%. For a more detailed look at July weather, you can refer to Sisimiut weather in July.
In comparing the weather conditions of September and August, it is evident that September experiences notably cooler temperatures, with a minimum of -4°C (25°F) and an average of 3°C (37°F), while August tends to be milder, showing minimum temperatures of 2°C (35°F) and an average of 7°C (44°F). Precipitation is slightly lower in September, totaling 53 mm (2.1 in) over 10 days, compared to 66 mm (2.6 in) over 11 days in August. Both months have high humidity levels, but September's humidity averages at 85%, slightly less than August's 89%. For more specific information about August weather, you can check Sisimiut weather in August.
In comparing the weather between September and October, we see a notable drop in temperatures. September experiences a milder range with minimums around -4°C (25°F) and average temperatures at 3°C (37°F), peaking at 9°C (49°F). In contrast, October brings even colder conditions, with minimum temperatures plummeting to -12°C (11°F) and an average of -1°C (30°F), though the maximum remains slightly warmer at 7°C (44°F). Precipitation also increases, with October receiving 75 mm (2.9 in) over 11 days compared to September's 53 mm (2.1 in) over 10 days, resulting in a similar humidity level of 85% and 86%, respectively. For more detailed insights, check out Sisimiut weather in October.
September and November weather exhibit notable differences, particularly in temperature and precipitation patterns. In September, temperatures range from a minimum of -4°C (25°F) to a maximum of 9°C (49°F), with an average of 3°C (37°F) and a total precipitation of 53 mm (2.1 in) over approximately 10 days. By November, the temperatures drop significantly, with a minimum of -15°C (5°F) and an average of -6°C (22°F), peaking at 4°C (39°F). The precipitation increases to 75 mm (3.0 in) over about 14 days, and humidity rises slightly to 89%. This shift indicates a transition from the milder, yet damp, conditions of September to the colder and wetter environment of November. For more detailed information, you can check Sisimiut weather in November.
In September, the weather in Sisimiut is relatively mild, with average temperatures hovering around 3°C (37°F) and maximums reaching up to 9°C (49°F). This month experiences about 53 mm (2.1 in) of precipitation over approximately 10 days, accompanied by a humidity level of 85%. In contrast, December ushers in a colder climate with average temperatures dropping to -7°C (19°F), and a maximum of only 5°C (41°F). Precipitation increases to 70 mm (2.8 in) spread over 14 days, and the humidity rises slightly to 90%. For a deeper look into December weather specifics, you can check Sisimiut weather in December.
September in Sisimiut ushers in a significant transition as summer gives way to autumn, marked by a notable drop in temperatures and an uptick in humidity. With average temperatures hovering around 3°C, the days are cooler and the nights can feel brisk, contrasting sharply with the balmy summer months. This month also experiences increased precipitation, with around ten days of rain contributing to a total of 53 mm, making it one of the wetter periods of the year. The elevated humidity of 85% adds to the overall chill in the air, encouraging the landscape to don its autumnal hues. For more insights into how these shifts shape the climate in this coastal stretch, visit Sisimiut Climate.