Last updated: August 21, 2025
In September, Imatra, Finland experiences a dynamic climate characterized by a maximum temperature reaching 23°C (74°F), with an average of 11°C (52°F) cooling down to a minimum of 0°C (33°F). This transitional month witnesses significant precipitation, totaling 70 mm (2.8 in) over approximately 12 days, enhancing the lush surroundings. With humidity levels hovering around 90%, the air feels brisk and refreshing, making it an ideal time for visitors to enjoy the natural beauty of this stunning region, marked by vibrant autumn foliage.
As September ushers in the transition from summer to autumn in Imatra, Finland, temperatures begin to cool but remain relatively mild. With minimums around 0°C (33°F) and average highs reaching 23°C (74°F), the month offers a refreshing shift from the heat of July and August. This gentle decline in warmth makes September an ideal time for outdoor activities amidst the stunning fall foliage. The average temperature settles at a comfortable 11°C (52°F), hinting at the crisp days ahead, while the last vestiges of summer linger, allowing residents and visitors alike to enjoy the evolving landscape before winter's chill takes hold.
In September, Imatra, Finland experiences a notable shift in precipitation patterns. The city receives approximately 70 mm (2.8 in) of rain over 12 days, marking a slight decline from the previous month's 86 mm (3.4 in). This average rainfall indicates a transition toward autumn, as the days grow shorter and cooler. Interestingly, while September's rainfall is slightly lower, it manages to maintain a consistent level of moisture comparable to the summer months. This balance hints at nature’s preparation for the brisker days ahead, as the precipitation begins to normalize after the peak of August, which often brings the highest levels of rainfall.
In September, Imatra, Finland, experiences a notable shift in humidity, with levels averaging 90%. This slight increase from the summer months, which typically hover around 82% to 84%, signals the onset of autumn, as the air begins to cool and moisture levels rise. The transition is evident, as September's humidity is markedly higher than the mid-summer lows of 75% in June and 77% in May. As the year progresses into the fall, humidity remains relatively high, closing the summer with a comfortable dampness that prepares the landscape for the upcoming winter season. This trend highlights Imatra's characteristic seasonal shifts, where the humid air plays a crucial role in shaping the region's climate throughout the year.
As September arrives in Imatra, Finland, the UV Index reflects a notable transition in the changing seasons. With a UV Index of 3, this month falls within the moderate category, indicating a burn time of approximately 30 minutes for unprotected skin. Compared to the preceding summer months, which reached a peak of 7 in July, September offers a more tempered sun exposure. However, this moderate level still warrants some caution, particularly as outdoor activities become more prevalent during the crisp autumn days. As we prepare for the shift to cooler temperatures and lower UV levels in October, it’s important to remain aware of sun safety. For detailed information on UV levels throughout the year, visit Imatra UV Index.
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In September, Imatra, Finland, basks in a generous 276 hours of sunlight, marking a gentle transition from the dazzling brightness of summer to the softer hues of autumn. This month shows a notable decline from the sun-drenched heights of July and June, where daylight hours peak at 480 and 485 respectively. However, it remains significantly brighter than the dreary depths of winter, where sunlight dwindles to a mere 24 hours by December. As the leaves start to turn, the gradual fade in daylight invites a moment of reflection on the changing seasons, reminding us of nature's rhythms and the fleeting spirit of summer in this picturesque Finnish town.
In Imatra, Finland, the likelihood of sunny weather experiences notable fluctuations throughout the year, with September offering a 21% chance of sunshine. This marks a decline from the vibrant summer months of July and June, which boast sunny probabilities of 56% and 55%, respectively. As autumn approaches, the chances of clear skies begin to wane, a trend that is reflected in the preceding months of August and May, with their 23% and 30% likelihoods. The pattern suggests that while September retains some of the lingering warmth of summer, it gradually gives way to the cooler, cloudier days of autumn, underscoring the seasonal transition.
As September unfolds in Imatra, Finland, the enchanting transition from summer to autumn becomes evident, with daylight lasting approximately 12 hours. This marks a gentle decline from the sun-soaked days of June and July, where residents enjoyed up to 19 hours of daylight. The gradual shortening of daylight hours reflects nature's shifting rhythm, as September brings about a cozy ambiance, contrasting sharply with the vibrant 17 hours of daylight experienced in May. As the month progresses, the days will continue to wane, paving the way for the crispness of October, which offers just 9 hours of daylight. This seasonal dance not only captures the essence of Finnish landscapes but also invites contemplation on the beauty of change.
In September, Imatra, Finland experiences a gentle shift in the air, with an average wind speed of 3.6 m/s (8 mph), a slight rise from the more tranquil summer months. This marks a transition from the lighter breezes of July and August, both averaging 2.9 m/s (7 mph), towards the brisker winds of autumn. As the landscape begins to change with the onset of fall, the wind gains momentum, hinting at the more vigorous gales to come in October, which boasts an average speed of 4.5 m/s (10 mph). This pattern highlights how September serves as a vital link, bridging the calm of summer with the invigorating winds that define the approaching colder months, creating a refreshing atmosphere perfect for outdoor explorations.
Weather in Imatra varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Imatra, focusing on differences in temperature, rainfall, humidity, and UV levels.
When comparing the weather in September and January, notable differences emerge. September enjoys a mild temperature range, with a minimum of 0°C (33°F) and a maximum of 23°C (74°F), making it significantly warmer overall with an average of 11°C (52°F). The month tends to be wet, accumulating around 70 mm (2.8 in) of precipitation over 12 days, paired with a high humidity of 90%. In contrast, January presents a stark chill, with temperatures plunging to a minimum of -26°C (-15°F) and peaking at only 7°C (45°F), resulting in an average of -5°C (24°F). Precipitation is lower at 46 mm (1.8 in), also spread over 12 days, but the humidity rises to a high of 98%. For a more detailed understanding of what to expect in January, you can check Imatra weather in January.
September and February present starkly contrasting weather conditions. In September, temperatures range from a minimum of 0°C (33°F) to a pleasant maximum of 23°C (74°F), with an average of 11°C (52°F). This month also sees significant rainfall, with 70 mm (2.8 in) spread over 12 days and humidity levels around 90%. In contrast, February experiences much colder temperatures, with a minimum of -28°C (-18°F) and a maximum of only 6°C (44°F), leading to an average of -6°C (22°F). While precipitation in February is slightly lower at 53 mm (2.1 in) over 11 days, humidity is notably high at 96%. For more detailed weather information, you can check Imatra weather in February.
September and March showcase stark contrasts in weather conditions. September boasts a milder temperature range, with averages around 11°C (52°F) and maximums reaching 23°C (74°F), while precipitation totals around 70 mm (2.8 in) spread over 12 days, accompanied by high humidity at 90%. In contrast, March brings much colder temperatures, with an average of -2°C (28°F) and minimums plummeting to -27°C (-16°F). The month sees about 48 mm (1.9 in) of precipitation, also over 12 days, but with even higher humidity at 93%. For a more detailed overview of March weather, you can check out Imatra weather in March.
When comparing September and April weather, September tends to be milder, with average temperatures ranging from 0°C (33°F) at night to a pleasant 23°C (74°F) during the day. In contrast, April is generally cooler, exhibiting a wider temperature range—from a chilly -13°C (9°F) as the minimum to a maximum of 19°C (67°F). While both months experience a fair amount of precipitation, September has a higher total of 70 mm (2.8 in) over roughly 12 days compared to April's 46 mm (1.8 in) over 11 days. Humidity levels are slightly higher in September at 90% compared to April's 88%. For more specific details on April's weather, you can check Imatra weather in April.
September and May present contrasting weather patterns, with September featuring a wider temperature range from a chilly minimum of 0°C (33°F) to a comfortable maximum of 23°C (74°F) and an average of 11°C (52°F). In contrast, May starts off cooler with temperatures ranging from -3°C (27°F) at night to a warmer 28°C (83°F) during the day, averaging at 10°C (50°F). While September experiences more precipitation at 70 mm (2.8 in) over 12 days and higher humidity at 90%, May sees less rain at 52 mm (2.1 in) over 10 days and slightly lower humidity at 77%. For a closer look at the climate specifics, you can visit Imatra weather in May.
In September, temperatures are generally cooler, with a minimum of 0°C (33°F) and an average of 11°C (52°F), while the month can still peak at a comfortable 23°C (74°F). In contrast, June offers warmer weather, starting with a minimum temperature of 2°C (36°F) and an average of 16°C (61°F), reaching highs of 32°C (89°F). Additionally, September tends to be more humid at 90%, compared to June's 75% humidity, which may make late summer days feel more oppressive. Precipitation is also slightly higher in September, totaling 70 mm (2.8 in) over 12 days, compared to June's 53 mm (2.1 in) over 10 days. For more detailed insights, check out Imatra weather in June.
In comparison to July, September experiences cooler temperatures, with a minimum of 0°C (33°F) and an average of 11°C (52°F), while July boasts warmer averages of 6°C (44°F) and 18°C (64°F), peaking at 32°C (89°F). Both months see similar levels of precipitation, around 70-72 mm (2.8 in), spread over approximately 12 days. Humidity also varies slightly, with September reaching 90% compared to July's 82%. For more detailed insights, you can explore Imatra weather in July.
In August, the weather tends to be warmer with average temperatures ranging from a minimum of 7°C (44°F) to a maximum of 29°C (85°F), and a pleasant average of 16°C (61°F). However, it also sees higher precipitation, totaling 86 mm (3.4 in) over 16 days, accompanied by a humidity level of 84%. In contrast, September ushers in cooler temperatures, with a minimum of 0°C (33°F) and a maximum of 23°C (74°F), leading to an average of 11°C (52°F). Although September has slightly lower total precipitation at 70 mm (2.8 in) over 12 days, it experiences increased humidity at 90%. For a more detailed comparison, you can check Imatra weather in August.
In September, temperatures typically range from a minimum of 0°C (33°F) to a maximum of 23°C (74°F), with an average of 11°C (52°F). The month experiences around 70 mm (2.8 in) of precipitation over approximately 12 days, accompanied by high humidity levels of 90%. In contrast, October brings cooler temperatures, with a minimum of -4°C (24°F) and an average of 6°C (43°F), peaking at a maximum of 18°C (65°F). Precipitation slightly increases to 73 mm (2.9 in) over 13 days, while humidity rises to 93%. The transition from September to October marks a notable shift towards chillier and wetter conditions. For more specific details on October weather, you can check Imatra weather in October.
September and November present contrasting weather patterns characterized by notable differences in temperature and precipitation. In September, temperatures range from a chilly 0°C (33°F) at night to a pleasant high of 23°C (74°F) during the day, with an average of 11°C (52°F). The month also sees relatively high humidity at 90% and approximately 70 mm (2.8 in) of rainfall across 12 days. In contrast, November experiences a significant drop in temperatures, with lows reaching -10°C (15°F) and an average of only 2°C (35°F). Daytime highs peak at 11°C (53°F), while the month receives less precipitation—48 mm (1.9 in) over 11 days—though humidity remains high at 93%. For more detailed information on November weather, visit Imatra weather in November.
September and December exhibit stark contrasts in weather patterns. In September, temperatures range from a mild 0°C (33°F) at night to a comfortable maximum of 23°C (74°F) during the day, with an average of 11°C (52°F). The month sees around 70 mm (2.8 in) of precipitation over 12 days, along with a relatively high humidity of 90%. In sharp contrast, December brings frigid temperatures, with lows plummeting to -21°C (-6°F) and daytime maxima reaching only 5°C (42°F), averaging -3°C (27°F). The month features slightly higher precipitation at 73 mm (2.9 in), spread over 16 days, and an even higher humidity level of 95%. For more details on December weather specifics, visit Imatra weather in December.
As September sets in, Imatra experiences a notable shift from the warmth of summer to the crispness of autumn. Daytime temperatures hover around a pleasant 11°C, offering a refreshing contrast to the sweltering months prior, while the nights can feel much cooler, often dipping to 0°C. With an average of 12 days of precipitation, the month is marked by an increase in humidity, reaching a notable 90%, creating a damp atmosphere that signals the change in seasons. This transition makes September an intriguing time to visit, as the landscape begins to transform with autumn colors, providing a unique charm distinct from the brighter months. For more insights into the local weather patterns, explore Imatra Climate.