Last updated: August 21, 2025
September in Kemi, Finland ushers in a transitional weather pattern that reflects the changing seasons. With daytime temperatures peaking at a pleasant 19°C (66°F) and dipping to a chilly -1°C (31°F) at night, visitors can expect a diverse range of conditions. The average temperature hovers around a crisp 10°C (50°F), making it perfect for outdoor activities while enjoying the autumn scenery. However, with 88 mm (3.4 in) of rainfall spread across 13 days, a waterproof jacket is advisable. The month also boasts a high humidity level at 89%, contributing to the refreshing yet brisk atmosphere conducive for exploration and adventure.
As September arrives in Kemi, Finland, the transition from summer to autumn begins, bringing a noticeable drop in temperatures. With daily minimums dipping to around -1°C (31°F) and average temperatures settling at a crisp 10°C (50°F), residents and visitors alike feel the shift from warmer days. The maximum temperature can still reach a pleasant 19°C (66°F), offering a few lingering moments of warmth before the chilly months ahead. This month serves as a gentle reminder of the approaching winter, contrasting starkly with the previous summer's highs, and invites exploration of Kemi's stunning natural landscapes adorned in early autumn colors.
In September, Kemi, Finland experiences a significant transition, with precipitation measuring an impressive 88 mm (3.4 in) over 13 days. This marks a slight decrease compared to the previous month, August, which recorded a remarkable 92 mm (3.6 in), but still reflects the region's characteristic onset of autumnal weather. As the summer warmth gives way, the steady rainfall in September prepares the landscape for the impending colder months, aligning closely with the trend of increasing precipitation that begins to peak in October. The pattern suggests that Kemi’s weather becomes increasingly dynamic as it moves into the fall season, with overall precipitation gradually escalating through the latter part of the year.
In September, Kemi experiences a notable shift in humidity levels, settling at 89% as the summer warmth begins to fade. This increase from the milder 83% in August signals a transition towards the crisper air of autumn, highlighting a gradual trend of rising humidity as the year progresses. While the winter months loom with their almost saturated levels—peaking at 99% in January—the early fall serves as a reminder of the balance between lingering warmth and the approaching chill. Collectively, the humidity data for Kemi suggests that while summer is receding, the moisture-laden air remains a constant feature, characteristic of this picturesque region throughout the year.
In September, Kemi, Finland experiences a moderate UV Index of 3, requiring about 30 minutes of sun exposure before risk of harm occurs. This month marks a slight decrease from the summer’s high levels, dropping from 6 in July and August to a more manageable level. As the days shorten and autumn approaches, the changing UV conditions signal a transition from the intense sun of summer to a gentler glow, allowing residents to enjoy the outdoors with heightened awareness. Interestingly, September's UV levels share similarities with those of March, both categorized as moderate, reminding us how seasonal shifts can influence our sun safety practices. For detailed information on sun exposure and safety in Kemi, check out the full Kemi UV Index.
UV Risk Categories
As the calendar turns to September in Kemi, Finland, the transition from the abundant summer sunshine to the cooler embrace of autumn begins to unfold. With 287 hours of sunlight, September enjoys a significant sunlit boost compared to the preceding months, though it marks a noticeable decline from the vibrant 512 hours experienced in the height of July. This decrease hints at the impending seasonal change, as daylight gradually diminishes leading into the shorter days of October, which offers only 157 hours. The gentle winding down of summer illuminates the beauty of the early fall, creating a picturesque backdrop for both locals and visitors to revel in the softer, golden light that characterizes this serene time of year.
In Kemi, Finland, the chance of sunny weather in September stands at a modest 28%, reflecting a gradual decrease as summer transitions into autumn. The peak of sunny days typically occurs in July, with a notable 54% chance, after which the likelihood begins to wane. August sees a slight dip to 31%, and September continues this trend, reminding us that while late summer days can still be bright, the sun becomes increasingly elusive as the year progresses. This pattern highlights the shift from the sun-soaked warmth of mid-summer to the more overcast skies of autumn, making September a bridge between two distinct seasons.
As September arrives in Kemi, Finland, the days begin to noticeably shorten, transitioning from the long, sun-drenched hours of summer to the more subdued light of autumn. With an average of 13 hours of daylight, this month reflects a gradual decline from July's peak of 20 hours. The lingering warmth of early fall continues to brighten the days, but the unmistakable shift is palpable as the sun sets earlier than in previous months. This change heralds the approach of winter, where daylight dwindles to just 4 hours in January. The rich tapestry of daylight throughout the year in Kemi illustrates the dramatic seasonal changes that define this northern landscape, captivating and challenging its residents alike.
As September arrives in Kemi, Finland, the wind begins to dance at a steady 4.2 m/s (9 mph), mirroring the breezy warmth of late summer. This month experiences a gentle transition, maintaining the same wind speed noted in August. However, a subtle shift is on the horizon; as October approaches, an increase in wind intensity to 5.4 m/s (12 mph) is expected, signaling the onset of autumn's more vigorous gusts. Overall, the year in Kemi sees a gradual rise in wind speeds during the colder months, with January's tranquil 3.8 m/s giving way to stronger winds by late fall. The trend underscores a dynamic shift, making September a perfect moment to appreciate the calm before the brisk winds of winter take hold.
Weather in Kemi varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Kemi, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is milder, with temperatures ranging from a minimum of -1°C (31°F) to a maximum of 19°C (66°F), averaging around 10°C (50°F). This month typically experiences 88 mm (3.4 in) of precipitation over about 13 days, with humidity levels at a comfortable 89%. In stark contrast, January delivers frigid conditions, with temperatures plunging to a minimum of -27°C (-17°F) and peaking at just 4°C (40°F), averaging -8°C (18°F). Precipitation in January is lower, at 50 mm (2.0 in) over 10 days, but humidity rises to a chilly 99%. For more detailed insights, you can check out Kemi weather in January.
September and February present stark contrasts in weather conditions. In September, temperatures range from a chilly minimum of -1°C (31°F) to a more pleasant maximum of 19°C (66°F), with an average of 10°C (50°F). The month witnesses considerable rainfall, totaling 88 mm (3.4 in) over approximately 13 days, and humidity levels sit at a high 89%. In contrast, February is much colder with temperatures plummeting to a minimum of -25°C (-13°F) and only reaching a maximum of 5°C (41°F), averaging -9°C (17°F). Precipitation is lighter at 48 mm (1.9 in) over just 9 days, but humidity is remarkably higher at 97%. For more details on the cold and crisp conditions, check out Kemi weather in February.
September and March present contrasting weather patterns. In September, temperatures range from a chilly minimum of -1°C (31°F) to a comfortable maximum of 19°C (66°F), with an average of 10°C (50°F). This month experiences about 88 mm (3.4 in) of precipitation over 13 days, and humidity lingers at 89%. In contrast, March tends to be significantly colder, with temperatures that can plummet to a minimum of -21°C (-6°F) and an average of -5°C (24°F), only peaking at 6°C (43°F). This month sees less rainfall, approximately 50 mm (2.0 in) spread over 10 days, while humidity remains relatively high at 93%. For more on the specifics of March weather, you can visit Kemi weather in March.
September and April exhibit striking contrasts in weather patterns. In September, temperatures are milder, with average highs reaching 19°C (66°F) and a more comfortable mean of 10°C (50°F). The month sees increased precipitation, with about 88 mm (3.4 inches) falling over 13 days and humidity levels at 89%. In contrast, April experiences colder temperatures, with minimums dipping to -14°C (7°F) and average highs of only 12°C (53°F). Precipitation is also lower in April, totaling 38 mm (1.5 inches) over just 7 days, accompanied by humidity slightly lower at 86%. For more details on the weather specific to April, you can visit Kemi weather in April.
September and May present contrasting weather patterns. In September, temperatures range from a minimum of -1°C (31°F) to a maximum of 19°C (66°F), with an average of 10°C (50°F). The month sees a total of 88 mm (3.4 in) of precipitation over approximately 13 days, accompanied by high humidity levels at 89%. In comparison, May experiences slightly cooler temperatures, with a minimum of -6°C (21°F) and a maximum of 20°C (68°F), averaging around 5°C (42°F). Precipitation is lower in May, totaling 52 mm (2.1 in) over about 9 days, and humidity is also less intense at 80%. For a detailed look at the weather during this time, visit Kemi weather in May.
In comparing the weather of September and June, notable differences in temperature and precipitation can be observed. September typically experiences cooler temperatures, with a minimum of -1°C (31°F) and a maximum of 19°C (66°F), averaging around 10°C (50°F). In contrast, June boasts milder temperatures, ranging from a minimum of 2°C (36°F) to a maximum of 24°C (75°F), with an average of 13°C (55°F). Also, September tends to be wetter, receiving about 88 mm (3.4 in) of rainfall over 13 days, compared to June's 59 mm (2.3 in) over just 8 days. Additionally, the humidity is higher in September at 89%, while June has a lower humidity level of 76%. For more detailed insights into June weather, you can visit Kemi weather in June.
When comparing the weather in September to that of July, notable differences emerge. September experiences cooler temperatures, with a minimum of -1°C (31°F) and an average of 10°C (50°F), while July boasts warmer conditions, featuring a minimum of 6°C (44°F) and an average of 17°C (62°F). Additionally, September sees more precipitation at 88 mm (3.4 in) over 13 days, compared to July's 63 mm (2.5 in) over just 10 days. Humidity levels are also higher in September at 89%, as opposed to July's 79%. For more detailed insights about July weather, you can visit Kemi weather in July.
In comparing the weather between August and September, September tends to be cooler, with average temperatures ranging from a minimum of -1°C (31°F) to a maximum of 19°C (66°F), while August enjoys milder conditions with temperatures ranging from a minimum of 4°C (40°F) to a maximum of 27°C (81°F). Both months experience similar levels of precipitation, with September receiving 88 mm (3.4 in) over 13 days and August slightly higher at 92 mm (3.6 in) over 14 days. Additionally, September has a higher humidity level at 89%, compared to 83% in August, contributing to a damp, cooler feel as summer transitions into fall. More details about weather in August can be found here: Kemi weather in August.
September's weather offers a gradual transition into autumn, with temperatures ranging from a minimum of -1°C (31°F) to a pleasant maximum of 19°C (66°F). The month experiences an average temperature of 10°C (50°F) and sees around 88 mm (3.4 in) of precipitation over 13 days, accompanied by a relatively high humidity of 89%. In contrast, October brings colder conditions, with temperatures dipping further, as lows reach -8°C (17°F) and highs peak at 13°C (56°F). Average temperatures drop to 4°C (40°F), and precipitation increases slightly to 106 mm (4.2 in) across 15 days, along with a rise in humidity to 94%. For more detailed information, check out Kemi weather in October.
September and November present quite contrasting weather conditions. In September, temperatures range from a chilly -1°C (31°F) at night to a mild 19°C (66°F) during the day, with an average temperature of 10°C (50°F). The month sees about 88 mm (3.4 in) of precipitation over approximately 13 days, accompanied by relatively high humidity levels of 89%. In stark comparison, November experiences much colder temperatures, with lows plummeting to -14°C (7°F) and an average of 0°C (32°F), reaching a maximum of only 9°C (48°F). While precipitation slightly decreases to 82 mm (3.2 in), it is spread over 16 days, and humidity rises to 94%. For more detailed insights on November weather, you can visit Kemi weather in November.
September and December present stark contrasts in weather. In September, temperatures range from a chilly minimum of -1°C (31°F) to a pleasant maximum of 19°C (66°F), with an average of 10°C (50°F). The month experiences relatively high humidity at 89% and sees about 88 mm (3.4 in) of precipitation over roughly 13 days. In comparison, December plunges into the depths of winter, where temperatures typically fall between -20°C (-3°F) and a maximum of 4°C (40°F), with an average of -4°C (25°F). Precipitation is lighter at 71 mm (2.8 in) but occurs over 16 days, alongside a notably higher humidity level of 98%. These conditions make September feel much milder and more inviting, while December brings a frigid finality to the year. For more details on December weather, you can visit Kemi weather in December.
As September unfolds in Kemi, the weather undergoes a noticeable shift, transitioning from the warmth of summer to the coolness of autumn. With average temperatures settling around 10°C (50°F) and maximums reaching 19°C (66°F), crisp air becomes more prevalent, especially as nights dip to -1°C (31°F). This month also brings an increase in precipitation, with 13 rainy days contributing to a humidity level of 89%. Unlike the dry summer months, September's moisture welcomes a vibrant tapestry of fall colors, making it an enchanting time to experience the natural beauty of the area. To delve deeper into Kemi's weather patterns throughout the year, explore more at Kemi Climate.