Last updated: August 21, 2025
In Hamina, Finland, September unveils a mild yet variable climate, where temperatures range from a brisk 0°C (32°F) at night to a pleasant 22°C (73°F) during the day. The average temperature settles around 12°C (54°F), providing a refreshing atmosphere as autumn approaches. This month experiences substantial rainfall, with 67 mm (2.6 in) recorded over approximately 12 days, contributing to a high humidity level of 90%. Whether you’re exploring the charming streets or enjoying the natural beauty, September in Hamina offers a unique experience shaped by its dynamic weather.
As September rolls into Hamina, Finland, the transition from the warm embrace of summer to the crispness of autumn is palpable. With minimum temperatures hovering around 0°C (32°F) and pleasant daytime highs peaking at 22°C (73°F), this month marks a gentle shift toward cooler weather. The average temperature of 12°C (54°F) creates a comfortable setting ideal for outdoor activities, as nature begins to display its stunning fall colors. Though the days are still comfortably warm, the nights remind us that winter is just around the corner, hinting at the dramatic temperature fluctuations that will soon take hold in this beautiful Nordic town.
September in Hamina, Finland marks a shift in the precipitation landscape as the summer warmth yields to the cooler embrace of autumn. With an average rainfall of 67 mm (2.6 in) distributed over 12 days, September stands out as a transitional month, welcoming more frequent showers compared to the preceding summer months. This uptick is evident when compared to August's 90 mm and reflects the city's overall rainy pattern, which peaks in October with 84 mm anticipated. The gradual increase in rainfall signals the onset of autumn, encouraging vibrant foliage while preparing the ground for the winter months ahead.
As summer transitions into autumn in Hamina, Finland, September experiences a notable shift in humidity, averaging 90%. This marks a slight increase from the preceding months, where August recorded 85%, highlighting a gradual return to the higher humidity levels typical of the earlier months in the year. From the depths of winter, when humidity peaks at 98% in January, a clear trend emerges: humidity tends to decrease as spring approaches but rises again towards the latter part of the year. The 90% humidity in September suggests that the crispness of fall is beginning to set in, but the lingering moisture reminds us of the summer's presence as the landscape prepares for the cooler months ahead.
As summer transitions into autumn, September in Hamina, Finland, sees a slight dip in the UV Index, settling at 4, which falls into the moderate exposure category. This indicates a shift from the higher summer months, where the UV Index peaked at 7 in both June and July. With a recommended burn time of just 30 minutes, September still requires some cautious sun exposure, echoing the earlier months of late spring and summer. This gradual decline not only reflects the changing seasons but also serves as a reminder of the need for protective measures even as the temperatures cool. As the daylight hours decrease, it's important to stay informed about UV levels; for more details, check Hamina UV Index.
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As summer fades into autumn, September in Hamina offers a delightful transition marked by 296 hours of sunshine. This month reflects a gradual decline from the peak brightness of July and June, when the sun graced the region with around 490 hours and 488 hours, respectively. September's sunlight, while still abundant, signifies nature's shift towards cooler days, yet it still outshines the winter months ahead, which are characterized by considerably less daylight. The progressive decrease from the vibrant summer months becomes part of the ambiance, inviting residents and visitors alike to relish the last warm traces of sunlight before the colder season settles in. This trend underscores the undeniable charm of September, bridging the warmth of summer and the crispness of autumn in this picturesque Finnish town.
As September rolls into Hamina, Finland, the likelihood of enjoying sunny days diminishes, dropping to a modest 23% chance of sunshine. This marks a noticeable decrease from the lively summer months, where July peaks at 59% sunny days. Following a trend from the warmer months, the chances of clear skies in September begin to wane, signaling a transition towards the crispness of autumn. While sun-kissed days become less frequent, the vibrant fall foliage makes up for it, inviting residents and visitors to embrace the change in season with its own unique charm.
As September unfolds in Hamina, Finland, daylight begins to wane after the sun-drenched days of summer. The city enjoys 12 hours of daylight, marking a gentle transition from the 18-hour daylight peaks of June and July. During this month, the lingering warmth of summer gives way to the crisp air of autumn, creating a perfect balance between light and dark. Compared to the preceding months, September’s daylight significantly decreases but still offers ample opportunity to savor the outdoors before the shorter days of October, with only 10 hours of daylight, settle in. This gradual shift not only highlights the changing seasons but also invites residents to embrace the beauty of nature as it prepares for the quietude of winter.
As September arrives in Hamina, Finland, the average wind speed settles at a brisk 4.2 m/s (9 mph), reflecting a transition towards the more blustery autumn months ahead. This slight uptick from the gentler breezes of summer, particularly the peak of 4.7 m/s (10 mph) in August, indicates that nature is starting to shift gears. September's winds mirror a trend of gradual increase that will continue into October, when speeds rise significantly to 5.6 m/s (13 mph). The changing winds not only signal the arrival of fall but also invite outdoor enthusiasts to embrace the crisp air and vibrant hues of the season.
Weather in Hamina varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Hamina, focusing on differences in temperature, rainfall, humidity, and UV levels.
The weather in September and January presents a stark contrast in terms of temperature and conditions. September sees milder temperatures ranging from a chilly 0°C (32°F) at night to a pleasant 22°C (73°F) during the day, with an average of 12°C (54°F). While it experiences a moderate amount of precipitation (67 mm) over about 12 days, humidity levels remain relatively high at 90%.
In sharp contrast, January plunges into much colder temperatures, with lows of -24°C (-10°F) and highs only reaching 7°C (46°F), averaging -3°C (27°F). This winter month has less precipitation at 55 mm, yet it also spans 12 days of potential snowfall, and humidity rises slightly to an impressive 98%. The difference between these two months highlights the significant seasonal shifts, as seen in Hamina weather in January.
September and February present stark contrasts in weather conditions. In September, temperatures range from a minimum of 0°C (32°F) to a comfortable maximum of 22°C (73°F), with an average temperature of 12°C (54°F). This month experiences about 67 mm (2.6 in) of precipitation over 12 days, accompanied by high humidity at 90%. In contrast, February is much colder, with temperatures plummeting to a minimum of -28°C (-18°F) and peaking at just 7°C (44°F), averaging -4°C (25°F). Although February has slightly less precipitation at 56 mm (2.2 in) over 11 days, the humidity rises to 96%, intensifying the cold. For more detailed insights on February weather, you can check out Hamina weather in February.
In September, the weather presents a mild atmosphere with temperatures ranging from a chilly 0°C (32°F) at night to a comfortable 22°C (73°F) during the day, accompanied by an average temperature of 12°C (54°F). The month sees around 67 mm (2.6 in) of precipitation over approximately 12 days, with humidity remaining relatively high at 90%. In contrast, March experiences much colder conditions, with temperatures dipping as low as -22°C (-7°F) and peaking at a modest 9°C (48°F), resulting in an average of -1°C (30°F). The month has slightly less precipitation at 50 mm (2.0 in) over 11 days, but the humidity is marginally higher at 93%. For a more detailed look into the weather in March, you can check Hamina weather in March.
When comparing the weather in September and April, we see notable differences in temperature and precipitation patterns. September boasts a milder climate, with average temperatures ranging from 12°C (54°F) to a maximum of 22°C (73°F), while April experiences cooler temperatures, with averages between 4°C (39°F) and a maximum of 19°C (67°F). Precipitation is slightly higher in September, with 67 mm (2.6 in) over about 12 days compared to April’s 43 mm (1.7 in) across 10 days. Humidity levels in September are a bit higher at 90% compared to April's 87%, contributing to the overall sense of dampness in both months. For a closer look at the April weather in Hamina, you can check Hamina weather in April.
When comparing the weather in September and May, several key differences emerge. September typically experiences mild temperatures, with average highs reaching 22°C (73°F) and lows around 0°C (32°F), while May shows a broader range of temperatures, with maximums of 26°C (79°F) and minimums dipping to -3°C (27°F). Additionally, September tends to be wetter, averaging 67 mm (2.6 in) of precipitation over 12 days compared to May’s 49 mm (1.9 in) over 9 days. Furthermore, the humidity levels are notably higher in September at 90%, compared to May’s 75%, contributing to a more humid atmosphere as summer transitions into fall. For more localized insights, you can check Hamina weather in May.
In comparing the weather of September and June, we observe notable differences in temperature and humidity. September has a wider temperature range, with a minimum of 0°C (32°F) and a maximum of 22°C (73°F), resulting in a cooler average temperature of 12°C (54°F). In contrast, June typically enjoys warmer temperatures, ranging from a minimum of 2°C (35°F) to a maximum of 30°C (87°F), with an average of 16°C (61°F). Additionally, September experiences higher humidity at 90%, while June has a more comfortable level at 74%. Precipitation is also slightly greater in September, totaling 67 mm (2.6 in) over 12 days, compared to June's 48 mm (1.9 in) over 10 days. For a more detailed insight into the weather in June, check out Hamina weather in June.
When comparing the weather in September and July, notable differences emerge in both temperature and precipitation. July typically experiences warmer conditions with average temperatures ranging from a minimum of 8°C (46°F) to a maximum of 31°C (88°F), while September sees a cooler range of 0°C (32°F) to 22°C (73°F) and an average temperature of 12°C (54°F). In terms of precipitation, July receives slightly more with 82 mm (3.2 in) across 11 days, compared to September's 67 mm (2.6 in) over 12 days. Furthermore, humidity levels are generally higher in September at 90%, compared to 80% in July. For more detailed insights, you can check Hamina weather in July.
September weather presents a notable shift from August, with cooler temperatures and increased precipitation. The average temperature drops to 12°C (54°F) in September, compared to a warmer average of 17°C (62°F) in August. While August boasts higher maximum temperatures, peaking at 30°C (87°F), September's highs reach only 22°C (73°F). Additionally, September experiences slightly more precipitation, totaling 67 mm (2.6 in) over 12 days, while August sees 90 mm (3.5 in) across 13 days. Humidity is also higher in September at 90%, compared to August’s 85%. For a detailed look at Hamina's weather in August, you can visit Hamina weather in August.
In September, the weather features mild temperatures, with averages around 12°C (54°F) and maximums reaching 22°C (73°F). However, as we transition into October, temperatures drop significantly, with minimums plummeting to -4°C (26°F) and an average of just 7°C (45°F). Precipitation also increases in October, totaling 84 mm (3.3 in) over 16 days, compared to 67 mm (2.6 in) over 12 days in September. The humidity rises slightly from 90% in September to 94% in October, creating a noticeably chillier and wetter atmosphere. For more detailed weather insights, visit Hamina weather in October.
September and November present notable differences in weather characteristics. In September, temperatures range from a minimum of 0°C (32°F) to a maximum of 22°C (73°F), with an average of 12°C (54°F), making it a generally milder month. The precipitation level is relatively high at 67 mm (2.6 in) over about 12 days, accompanied by a humidity level of 90%. In contrast, November experiences colder conditions, with temperatures dipping to a minimum of -8°C (18°F) and an average of just 3°C (38°F), peaking at 12°C (54°F). Although precipitation remains similar at 65 mm (2.6 in), it occurs over a slightly greater number of days, 14. The humidity also increases to 94%, indicating a damp atmosphere. For more detailed insights into November weather, visit Hamina weather in November.
September and December present stark contrasts in weather conditions. In September, temperatures range from a minimum of 0°C (32°F) to a maximum of 22°C (73°F), averaging around 12°C (54°F). This month also sees a fair amount of precipitation, with 67 mm (2.6 in) spread over 12 days, coupled with a humidity level of 90%. By December, the situation shifts dramatically; temperatures drop significantly, with lows reaching -18°C (0°F) and highs peaking at just 6°C (44°F), resulting in an average temperature of -1°C (30°F). Precipitation also increases to 82 mm (3.2 in) over 16 days, and humidity rises to 96%, creating a much colder and wetter atmosphere. For more details about conditions specifically in December, check out Hamina weather in December.
As September unfolds in Hamina, the weather presents a notable transition from the warmth of summer to the cooler embrace of autumn. Temperatures begin to dip, offering a refreshing contrast to the preceding months, with the average hovering around a crisp 12°C. This month also ushers in a higher incidence of rain, with 12 days of precipitation, contributing to the increased humidity levels that can reach a notable 90%. The vibrant colors of early autumn coupled with the cool, damp air create a unique atmosphere, distinct from the dry warmth of summer. For a deeper understanding of these climatic shifts, explore Hamina Climate.