Last updated: August 27, 2025
September in Lulea, Sweden offers a transition into the crispness of autumn, with temperatures ranging from a maximum of 18°C (64°F) to a minimum of 2°C (36°F), averaging around 11°C (51°F). This month experiences 71 mm (2.8 in) of rainfall over approximately 11 days, creating a lush and vibrant atmosphere as the leaves begin to change. The humidity remains high at 88%, contributing to the cool yet invigorating air. As summer fades, September reveals Lulea's natural beauty, inviting exploration of its stunning landscapes.
As September rolls into Luleå, Sweden, the transition from summer warmth to autumn chill becomes evident. The temperatures dip with a minimum of 2°C (36°F) and an average of 11°C (51°F), revealing the crispness that characterizes this northern town. Daytime peaks can still reach a comfortable 18°C (64°F), but the lingering warmth of summer is visibly receding. This month marks a notable shift from the higher marks of 25°C (77°F) in August, painting a vivid picture of the region's dramatic seasonal changes. The air grows brisker, and the vibrant foliage is soon to follow, making September a stunning prelude to Luleå's enchanting autumn landscape.
September in Luleå, Sweden, typically experiences a notable shift in precipitation, with 71 mm (2.8 in) of rain spread over 11 days. This slight decrease from August's 76 mm (3.0 in) signals the onset of autumn, where falling temperatures often lead to increased cloud cover and rain. Compared to earlier months, September's precipitation marks a transitional phase, balancing between the summer's wetter days and the approaching winter with October poised to deliver even heavier rains at 100 mm (3.9 in). This trend hints at the changing seasons, as both temperatures and precipitation patterns begin to align with the crispness of fall, preparing the region for the winter's embrace.
As autumn begins to settle in Lulea, September brings a notable shift in humidity, averaging 88%. This moderate level reflects a gradual transition from the warmer summer months, where humidity peaked at 84% in August and 82% in July. Notably, the trend shows a steady rise in humidity through the fall, as September's levels climb higher, paving the way for the approaching winter months, which see humidity levels soar back to the 92-96% range. This month, marked by the crispness of early autumn, serves as a reminder of the impending cold and the characteristic moisture that Lulea experiences year-round.
In September, Luleå enjoys a moderate UV Index of 3, offering a pleasant transition from the summer months. This means residents and visitors can safely bask in the sun for about 30 minutes before needing protection. Following the higher indices of June and July, where the UV Index peaked at 6, September reflects a gradual decline, maintaining a balance that encourages outdoor activities while still reminding sun seekers to stay cautious. As autumn approaches, it's wise to be aware of the UV levels, ensuring you can enjoy the crisp, fresh air without overexposing your skin. For more detailed information about UV levels throughout the year, check out Lulea UV Index.
UV Risk Categories
As September rolls into Lulea, Sweden, residents revel in a transition to autumn, illuminated by a generous 291 hours of sunshine. This marks a delightful shift from the sun-drenched summer months, which peaked at 522 hours in June and 512 hours in July. Although the daylight begins to wane as temperatures cool, September still shines brighter than both the frosty winter months and the overcast days of late fall, where sunshine dips dramatically to a mere 25 hours by December. Compared to earlier months, September offers a softer glow than the vibrant 468 hours of May, yet it still holds its charm, bridging the lush warmth of summer with the crisp promise of autumn. This gentle decline in sunshine hints at nature's transition, beautifully reminding us to cherish the golden hues before winter's embrace.
In Lulea, Sweden, the likelihood of sunny weather experiences notable fluctuations throughout the year. September, with a 28% chance of sun, falls into a more subdued period for sunshine compared to the summer months, which peak in July with a 58% likelihood. The transition toward autumn is marked by a gradual decline in sunny days, as the vibrant light of summer yields to the crispness of fall. Following August's 36%, September represents a continued yet diminishing chance for sun, suggesting that while it retains a hint of summer's brightness, the days are increasingly colored by clouds and impending cooler weather.
As summer fades into autumn in Luleå, Sweden, September marks a significant transition in daylight duration. After basking in nearly 22 hours of twilight during June, the days begin to shorten, with September offering about 13 hours of daylight. This gradual decrease is a meaningful shift following the vibrant summer months, yet it remains enjoyable as nature starts to transition, showcasing early fall colors. The trend reveals a steady descent from the sun-drenched days of summer, through the gold-hued warmth of autumn, leading us toward the long, dark winters. As October approaches with only 9 hours of light, September serves as a beautiful bridge, inviting reflection and appreciation for the changing seasons.
As September rolls in, Luleå, Sweden experiences a noticeable shift in wind dynamics, with an average wind speed of 5.4 m/s (12 mph), matching the brisk pace set earlier in the year. This month marks a return to higher winds reminiscent of the spring, following a series of calmer summer months where speeds dipped to around 4.5 m/s (10 mph) in June and July. The revitalizing breezes of September not only signal the approach of autumn but also lay the groundwork for the increasingly gusty conditions of October, which sees a jump to 6.4 m/s (14 mph). Overall, the wind patterns show a compelling ebb and flow, inviting residents and visitors alike to savor the refreshing air that has become a defining characteristic of the season.
Weather in Lulea varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Lulea, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January exhibit stark contrasts in weather patterns. In September, temperatures range from a mild 2°C (36°F) to a comfortable max of 18°C (64°F), accompanied by an average of 11°C (51°F). The month sees 71 mm (2.8 in) of precipitation over approximately 11 days, with a humidity level of 88%. In sharp contrast, January is characterized by biting cold, with temperatures dipping as low as -22°C (-7°F) and peaking at a mere 6°C (43°F), averaging -6°C (22°F). Despite having lower precipitation at 53 mm (2.1 in) over the same number of days, January's humidity is notably high at 97%. For more details on January conditions, visit Lulea weather in January.
September weather presents a mild transition into fall, with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 18°C (64°F) and an average of 11°C (51°F). This month experiences about 71 mm (2.8 in) of precipitation over approximately 11 days, accompanied by high humidity at 88%. In contrast, February is characterized by a stark chill, with temperatures dropping as low as -20°C (-4°F) and averaging -7°C (19°F), peaking at 6°C (43°F). Although February sees less precipitation at 40 mm (1.6 in) over just 7 days, the humidity is notably high at 95%. For more detailed information, check out Lulea weather in February.
September and March present starkly contrasting weather conditions. In September, temperatures range from a mild 2°C (36°F) to a comfortable maximum of 18°C (64°F), with an average of 11°C (51°F), while precipitation totals around 71 mm (2.8 in) over 11 days, accompanied by high humidity at 88%. In contrast, March is significantly colder, with temperatures dipping as low as -17°C (2°F) and only reaching a maximum of 7°C (45°F), resulting in an average temperature of -4°C (25°F). Precipitation is less frequent in March, totaling 42 mm (1.7 in) over 9 days, but the humidity remains high at 90%. For more details on March weather, visit Lulea weather in March.
In September, temperatures in Luleå range from a chilly minimum of 2°C (36°F) to a pleasant maximum of 18°C (64°F), with an average of 11°C (51°F). The month is characterized by higher precipitation, totaling 71 mm (2.8 in) over about 11 days, along with a humidity level of 88%. In contrast, April experiences colder conditions, with temperatures fluctuating between a minimum of -11°C (13°F) and a maximum of 11°C (53°F), averaging around 0°C (32°F). Precipitation in April is significantly lower at 28 mm (1.1 in) spread across just 5 days, and humidity is slightly lower at 84%. For more detailed insights into Luleå’s April weather, check out Lulea weather in April.
When comparing the weather in September and May, we see notable differences in temperature and precipitation. September typically enjoys a milder temperature range with minimums around 2°C (36°F) and maximums reaching 18°C (64°F). In contrast, May shows slightly cooler temperatures, with minimums dropping to -2°C (28°F) and averages around 5°C (42°F). However, both months experience a similar maximum temperature of 18°C (65°F). Precipitation levels are higher in September, averaging 71 mm (2.8 in) over 11 days, compared to May's 43 mm (1.7 in) spread over just 7 days. Humidity remains relatively high in both months, with September at 88% and May at 81%. For more detailed information, you can check Lulea weather in May.
When comparing the weather in September and June, notable differences emerge. September tends to be cooler, with average temperatures ranging from a chilly 2°C (36°F) to a maximum of 18°C (64°F), while June boasts warmer averages, with temperatures from 3°C (38°F) up to 24°C (75°F). Additionally, September experiences higher precipitation, totaling 71 mm (2.8 in) over approximately 11 days, compared to June's 54 mm (2.1 in) across just 6 days. Humidity is also higher in September at 88%, compared to June's 78%, giving September a distinctly more damp feel. For a more detailed look at June's weather, you can explore Lulea weather in June.
In comparing the weather of September and July, we see a notable shift in temperatures and conditions. September experiences cooler temperatures, with minimums dipping to 2°C (36°F) and an average of 11°C (51°F), whereas July boasts warmer averages at 16°C (62°F) and highs reaching up to 26°C (78°F). Additionally, September has a higher humidity level at 88% compared to July's 82%. Although both months see a fair amount of precipitation, September has slightly more rainfall with 71 mm (2.8 in) over 11 days, while July receives 65 mm (2.6 in) over 9 days. For more details on July weather, you can check Lulea weather in July.
In August, temperatures are generally warmer, with minimums around 7°C (45°F) and maximums reaching up to 25°C (78°F), giving it an average temperature of 15°C (59°F). In contrast, September sees a notable drop, with minimum temperatures dipping to 2°C (36°F) and maximums peaking at just 18°C (64°F), resulting in a cooler average of 11°C (51°F). Additionally, August experiences slightly higher precipitation at 76 mm (3.0 in) over 12 days compared to September's 71 mm (2.8 in) across 11 days, albeit with marginally less humidity in August at 84% compared to September's 88%. For more detailed insights into August weather, you can visit Lulea weather in August.
September and October in Lulea present a noticeable shift in weather patterns. September experiences milder temperatures, with averages hovering around 11°C (51°F) and maximums reaching 18°C (64°F), while October sees a drop, with average temperatures declining to 5°C (41°F) and max temperatures only peaking at 14°C (58°F). Additionally, precipitation increases in October to 100 mm (3.9 in) over 15 days, compared to September’s 71 mm (2.8 in) over 11 days. Humidity also rises slightly from 88% in September to 92% in October, adding to the crisp, cool atmosphere of the latter month. For more insights into the weather specifics, you can check Lulea weather in October.
September weather tends to be milder, with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 18°C (64°F) and an average of 11°C (51°F). It experiences approximately 71 mm (2.8 in) of rainfall over 11 days, along with a relatively high humidity of 88%. In stark contrast, November brings much colder temperatures, with a minimum reaching -14°C (8°F) and an average of 0°C (33°F), peaking at just 10°C (49°F). Although November sees slightly less precipitation at 62 mm (2.4 in) over 12 days, the humidity rises to 93%. To learn more about Lulea's weather in November, you can visit Lulea weather in November.
In September, temperatures in Luleå range from a minimum of 2°C (36°F) to a maximum of 18°C (64°F), with an average of 11°C (51°F). The month experiences around 71 mm (2.8 in) of precipitation over 11 days and maintains a relatively high humidity level of 88%. In contrast, December brings significantly colder conditions, with temperatures plummeting to a minimum of -17°C (2°F) and averaging -3°C (27°F), reaching a maximum of only 5°C (41°F). Precipitation in December is similar, at 72 mm (2.8 in), but it falls over more days—17 in total—which coincides with an even higher humidity of 96%. For a more detailed view of December’s weather, you can check out Lulea weather in December.
As September unfolds in Lulea, the weather takes a noticeable turn, transitioning from the warm embrace of summer to the crispness of autumn. With temperatures averaging a cool 11°C (51°F), visitors can expect a refreshing chill in the air, especially during the night when it dips to around 2°C (36°F). Rain becomes more frequent, with 11 days of precipitation contributing to a humidity level that hovers around a high 88%. This month sets a contrasting stage compared to the sunnier, drier days of July and August, making it a unique time to experience Lulea's vibrant autumnal landscape. To explore more about what to expect throughout the year, check out Lulea Climate.