Last updated: August 21, 2025
September in Kalajoki, Finland is characterized by a diverse climate, where temperatures oscillate from a pleasant maximum of 23°C (75°F) to a brisk minimum of -3°C (26°F), averaging around 10°C (50°F). This transitional month experiences 75 mm (3.0 in) of precipitation spread over 12 days, contributing to a notably high humidity level of 89%. As summer fades, early autumn brings a refreshing chill and sporadic rain, creating a picturesque backdrop for nature enthusiasts and visitors alike.
As September arrives in Kalajoki, Finland, temperatures begin to transition from the warmth of summer to the cooler embrace of autumn. With minimums dipping to -3°C (26°F) and maximums reaching a pleasant 23°C (75°F), this month marks a gentle shift in the climate. The average temperature settles at 10°C (50°F), offering a refreshing feel that invites outdoor activities amidst the changing leaves. Unlike the previous months, where highs soared into the low 30s, September's milder weather hints at the winter chill that lies ahead, while still allowing for relatively warm days that linger in the season's twilight.
In September, Kalajoki experiences a noteworthy transition as summer gives way to autumn, reflected in its precipitation levels. With 75 mm (3.0 in) of rainfall over 12 days, September emerges as a month of significant moisture, laying a foundation for the wetter fall months ahead. This amount is notably less than the preceding month of August, which recorded 87 mm (3.4 in), yet still surpasses the earlier spring months. The overall trend shows September as a key turning point, where days of rain continue to increase, foreshadowing the approaching October, which typically sees even higher precipitation at 81 mm (3.2 in). This consistent pattern of rainfall highlights the region's transition into the wetter season, setting a lush backdrop that characterizes the landscapes of Kalajoki.
As summer fades and autumn begins, September in Kalajoki, Finland, sees a notable shift in humidity, settling at 89%. This reflects a gradual increase from the dry spells of June and July, where humidity dipped to 76% and 79%, respectively. Following a seasonal peak in August at 83%, September ushers in a more moisture-laden atmosphere, preparing for the cooler months ahead. In the coming months, humidity is expected to rise again, reaching 94% by October, suggesting that the transition into autumn brings a return to the lush, damp conditions typical of Finnish winters. Overall, September serves as a bridge between the warmer, drier summer and the wetter, chillier months to come, creating a refreshing balance in Kalajoki's climate.
In September in Kalajoki, Finland, the UV Index drops to 3, indicating a moderate exposure category, similar to the levels seen in March. This moderate rating suggests a burn time of about 30 minutes, making it essential for outdoor enthusiasts to take precautionary measures under the sun. As summer fades, the UV Index begins to decline, following a peak of 6 in July and August. This gradual decrease indicates a shift in seasonal sunlight intensity, offering a chance to enjoy the gentle autumn sun while staying mindful of UV exposure. For more detailed insights, check out the Kalajoki UV Index.
UV Risk Categories
September in Kalajoki, Finland, experiences a radiant transition as daylight begins to wane, with 291 hours of sunshine illuminating the month. While this represents a decrease from the vibrant summer months of June and July, which boasted over 500 hours, it still stands as a significant improvement compared to the winter months. This gentle decline is part of a broader trend in Kalajoki, where longer days greet the region from March to August, peaking in summer before giving way to the shorter, cooler days of autumn and winter. As daylight gives way to cozy evenings, September's sunshine begins to hint at the coming change, inviting locals and visitors alike to savor the last golden days of warmth before the chill sets in.
In Kalajoki, Finland, September marks a transitional period as summer fades into autumn, reflected in its 26% chance of sunny weather. This percentage showcases a notable drop from the sunniest months of July and June, which boast probabilities of 53% and 50% respectively. As the year progresses, the likelihood of basking in sunshine begins to decline, particularly when compared to the vibrant days of early summer. Though September offers a fair chance of clear skies, it's a gentle reminder that the long days of summer are giving way to the dimmer, cooler months ahead.
As summer transitions into autumn, September in Kalajoki, Finland, sees a gradual shift in daylight, offering about 12 hours of sunlight. This month marks a departure from the long days of summer, where June basked in nearly 20 hours of daylight. The trend begins with a decline from August's 16 hours, signaling the onset of shorter days as the year progresses toward winter. While September still captures the lingering warmth of the season, it serves as a gentle reminder of the coming darker months, with the daylight progressively shrinking to just 9 hours by October. This subtle reduction in sunlight invites a contemplative mood, perfectly showcasing the annual rhythm of light and darkness in this picturesque Finnish locale.
As September arrives in Kalajoki, Finland, the average wind speed holds steady at 3.4 m/s (8 mph), matching the gentle breezes of August. This consistency heralds the transition into autumn, where the winds signal a shift in the season. Observing the monthly trends, it’s interesting to note that wind speeds tend to fluctuate, with March boasting the highest average at 4.1 m/s (9 mph), while the summer months remain calmer, often under 3.5 m/s. With the approach of October, we can anticipate the winds picking up their pace once again, offering a preview of the invigorating gales that often accompany the colder months. This ebb and flow of wind speeds not only shapes Kalajoki's climate but also paints a vivid picture of the changing seasons throughout the year.
Weather in Kalajoki varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Kalajoki, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present starkly contrasting weather conditions. In September, temperatures range from a mild minimum of -3°C (26°F) to a pleasant average of 10°C (50°F), peaking at a warm 23°C (75°F). The month experiences a moderate level of precipitation at 75 mm (3.0 in) over about 12 days, with humidity hovering around 89%. In contrast, January brings much harsher conditions, with temperatures plummeting to a chilling minimum of -28°C (-18°F) and an average of -5°C (22°F), only reaching a maximum of 6°C (44°F). Precipitation is significantly lower at 36 mm (1.4 in) over 9 days, yet the humidity is almost complete at 99%. For more detailed information, check out Kalajoki weather in January.
In comparing the weather of September and February, one can observe significant differences in temperature and overall climate conditions. September typically enjoys milder temperatures, ranging from a minimum of -3°C (26°F) to a maximum of 23°C (75°F), with an average temperature of 10°C (50°F). It also experiences a fair amount of precipitation, with around 75 mm (3.0 in) spread over 12 days and humidity at 89%. In contrast, February is much colder, with temperatures plummeting to a minimum of -27°C (-16°F) and peaking at just 6°C (43°F), translating to an average of -7°C (20°F). Although February has less precipitation at 39 mm (1.5 in) over 8 days, the humidity is slightly higher at 97%. For a more detailed look at February's weather specifics, visit Kalajoki weather in February.
In September, the weather is considerably milder, with average temperatures ranging from a minimum of -3°C (26°F) to a maximum of 23°C (75°F), and an overall average of 10°C (50°F). The month sees about 75 mm (3.0 in) of precipitation over approximately 12 days, accompanied by high humidity levels of 89%. In contrast, March is much chillier, with temperatures plummeting to a low of -28°C (-19°F) and a maximum of only 10°C (50°F), averaging at -3°C (27°F). This month experiences less rainfall, totaling around 37 mm (1.5 in) over 10 days, but the humidity is slightly higher at 93%. For a more detailed look at March weather, you can visit Kalajoki weather in March.
In comparing the weather between September and April, it's clear that September experiences milder temperatures, with an average of 10°C (50°F) and a maximum of 23°C (75°F), while April tends to be chillier, with an average of just 2°C (36°F) and a maximum of 20°C (68°F). Precipitation is more prevalent in September, totaling 75 mm (3.0 in) spread over 12 days, whereas April sees less rainfall at 39 mm (1.5 in) over only 7 days. Humidity levels are slightly higher in September at 89%, compared to April's 86%. For more detailed insights into April weather, you can check this link: Kalajoki weather in April.
When comparing the weather in September and May, we observe some notable differences. September tends to be slightly warmer, with average temperatures around 10°C (50°F) and a maximum reaching 23°C (75°F), compared to May’s average of 8°C (47°F) and a peak of 27°C (80°F). However, May experiences lower minimum temperatures, dropping to -5°C (24°F) compared to September’s -3°C (26°F). Precipitation is also lesser in May, accumulating 55 mm (2.2 in) over 8 days, while September sees a higher total of 75 mm (3.0 in) across 12 days. Additionally, humidity levels are higher in September at 89%, whereas May has a more comfortable 80%. For a closer look at May's weather details, check out Kalajoki weather in May.
In comparing the weather between September and June, we see distinct differences in both temperature and precipitation. September experiences cooler temperatures, ranging from a minimum of -3°C (26°F) to a maximum of 23°C (75°F), with an average of 10°C (50°F). This month also sees substantial precipitation, with 75 mm (3.0 in) over 12 days and high humidity at 89%. In contrast, June boasts warmer conditions, with temperatures varying from a minimum of 0°C (32°F) to a maximum of 30°C (86°F), averaging 14°C (58°F). The precipitation is lighter in June, totaling 53 mm (2.1 in) across just 8 days and lower humidity at 76%. For more details on June weather, you can check out Kalajoki weather in June.
In comparing the weather between September and July, notable differences emerge in both temperature and humidity. July tends to be significantly warmer, with average temperatures around 17°C (63°F) and maximums reaching up to 33°C (91°F), while September cools down to an average of 10°C (50°F) with a maximum of 23°C (75°F). Additionally, September experiences a marked increase in humidity at 89%, compared to July's 79%. Precipitation levels are relatively similar, with September receiving 75 mm over 12 days and July seeing 68 mm over 11 days. For more information, you can check Kalajoki weather in July.
In comparing the weather of September and August, it's clear that September is notably cooler, with average temperatures dropping from August's 15°C (59°F) to just 10°C (50°F). The maximum temperature in September reaches 23°C (75°F), significantly lower than August's peak of 33°C (92°F). Despite a slight decrease in total precipitation from August to September—87 mm (3.4 in) to 75 mm (3.0 in)—the number of rainy days remains relatively high in both months, with September experiencing rain on 12 days compared to August's 15 days. Interestingly, humidity levels are higher in September at 89%, compared to August's 83%, contributing to a cooler, more damp feel. For those interested in the specifics of August weather, you can find more information here: Kalajoki weather in August.
September and October exhibit notable changes in weather patterns. In September, temperatures range from a minimum of -3°C (26°F) to a maximum of 23°C (75°F), with an average of 10°C (50°F). The month experiences 75 mm (3.0 in) of precipitation over 12 days, accompanied by a humidity level of 89%. In contrast, October brings colder temperatures, with minima dropping to -14°C (8°F) and an average of 5°C (41°F). The maximum temperature in October is 19°C (67°F), while precipitation slightly increases to 81 mm (3.2 in) spread over 14 days, and humidity rises to 94%. For more on October weather specifics, visit Kalajoki weather in October.
In comparing the weather between September and November, a notable shift is evident. September enjoys milder temperatures, with a minimum of -3°C (26°F) and an average of 10°C (50°F), reaching a maximum of 23°C (75°F). The month also experiences 75 mm (3.0 in) of precipitation over approximately 12 days, accompanied by relatively high humidity at 89%.
In contrast, November brings a significant drop in temperatures, with lows of -18°C (0°F), an average temperature of just 1°C (33°F), and a maximum of 10°C (51°F). While November has slightly lower precipitation at 58 mm (2.3 in) over about 11 days, humidity increases to 94%, contributing to a colder and more damp environment. For a detailed overview, you can check Kalajoki weather in November.
In September, the weather is relatively mild, with temperatures ranging from a minimum of -3°C (26°F) to a maximum of 23°C (75°F) and an average of 10°C (50°F). The month sees about 75 mm of precipitation over 12 days, coupled with high humidity at 89%. In contrast, December presents a stark change, featuring much colder temperatures with a minimum of -22°C (-8°F), an average of -3°C (27°F), and a maximum of only 5°C (42°F). Precipitation diminishes slightly to 48 mm, also spread across 12 days, while humidity rises to a notable 98%. For a more detailed perspective, you can check Kalajoki weather in December.
As September unfolds in Kalajoki, the weather showcases a notable shift from the warmer summer months. While the temperatures cool down, averaging around 10°C (50°F) and dipping to chilly lows, the highlights of the month include vibrant autumn hues and refreshing breezes. With about 75 mm of rain over 12 days, September brings increased moisture, contributing to the region's lush landscapes, all against the backdrop of high humidity. This transition not only sets the stage for stunning fall scenery but also marks a unique blend of lingering warmth and the approaching chill of winter. For more insights on how these trends play out throughout the year, explore Kalajoki Climate.