September Weather in Fjallbacka, Sweden

Last updated: August 27, 2025

Fjallbacka, Sweden, in September offers a mild maritime climate, characterized by a maximum temperature of 21°C (71°F) and an average of 13°C (55°F), dropping to a cool 3°C (38°F) at night. Rain is a frequent visitor, with 79 mm (3.1 in) of precipitation spread across 13 days, contributing to the region's lush scenery. This month also boasts a high humidity level of 86%, enhancing the atmospheric feel of this picturesque coastal town. Embrace the blend of warm days and cool nights, perfect for enjoying the stunning landscapes and charming streets of Fjallbacka.

September Temperature in Fjallbacka

As September unfolds in Fjallbacka, Sweden, the lingering warmth of summer begins to ebb, yet the temperatures remain comfortably mild. With minimums around 3°C (38°F) and average highs peaking at 21°C (71°F), this month offers a gentle transition into autumn. Visitors can expect crisp mornings paired with pleasantly warm afternoons, perfect for outdoor exploration. Compared to the sweltering heights of summer, September’s temperatures provide a refreshing change, making it an ideal time to enjoy the stunning coastal scenery and vibrant fall foliage without the summer crowds. As the month draws to a close, the shift toward cooler days signals the charming yet brisk autumn that lies ahead.

September Weather in Fjallbacka: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Fjallbacka, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fjallbacka, September typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec333136425161646155473934
Data source: Temperature data for Fjallbacka generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Fjallbacka

In September, Fjallbacka experiences a moderate precipitation level of 79 mm (3.1 in), making it one of the wetter months as it transitions into autumn. Rainfall occurs on approximately 13 days, slightly less frequent than the previous month, yet still contributing significantly to the overall dampness that characterizes the late summer and early autumn period. This trend is consistent with the gradual increase in precipitation observed from the earlier months, peaking in August with 89 mm (3.5 in), before tapering off into the cooler months. Overall, September's weather reflects a smooth transition typical for the region, preparing the landscape for the vibrant colors of fall while maintaining ample moisture.

September Precipitation Trends in Fjallbacka

The chart displays monthly precipitation patterns in Fjallbacka, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Fjallbacka, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec485652296970768979896976
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Fjallbacka

As summer transitions into autumn, September in Fjallbacka, Sweden, experiences a noticeable uptick in humidity, rising to 86%. This shift marks a return to more moisture-laden air following the drier months of May and June, which saw humidity levels dip to their lowest at 73% and 71%, respectively. By August, humidity begins to creep back up to 77%, setting the stage for September’s more humid conditions. As the year progresses, the trend showcases a gradual increase in humidity from September through November, culminating in the year’s peak in the cold winter months of January and February, with levels reaching a damp 94%. This cyclical pattern of humidity reflects the region's transition from the warmth of summer into the cooler, more moisture-rich autumn and winter seasons.

September Average Humidity in Fjallbacka

This chart illustrates the average monthly humidity levels in Fjallbacka, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Fjallbacka is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec94%92%89%82%73%71%72%77%86%92%93%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Fjallbacka

As summer gracefully gives way to autumn in Fjällbacka, September sees a moderate UV Index of 4, allowing for enjoyable outdoor activities while still requiring a bit of sun protection. With a burn time of 30 minutes, it's a reminder to strike a balance between soaking in the last rays of summer and safeguarding your skin. The trend from earlier months shows a decrease from the high points of July and June, where the UV Index peaked at 7, highlighting a shift towards gentler sun exposure as the seasons change. As you explore the charming coastal beauty of Fjällbacka this month, remember to stay informed about the evolving UV Index and plan your time outdoors accordingly. For more details, check out the complete Fjallbacka UV Index.

Maximum UV Index Levels in Fjallbacka for September

The chart shows the monthly maximum UV Index (UVI) for Fjallbacka in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Fjallbacka typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123457754211
Data source: Fjallbacka September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

September Sunshine in Fjallbacka

September in Fjallbacka, Sweden, brings a delightful transition as summer gently fades into autumn. With 298 hours of sunshine, it's a month where lingering warmth still graces the shores, allowing both residents and visitors to savor the last rays of summer. After peaking in June and July with 470 and 482 hours respectively, sunlight begins to wane noticeably, yet September maintains a vibrant glow compared to the shorter days ahead. This trend of diminishing daylight captures the essence of change, showcasing nature's rhythm as it prepares for the quieter months of October and November, which see a significant drop to 234 and 134 hours. Embrace the crisp air and beautiful hues of September, where the sunshine offers a splendid farewell to the season before inviting the rich tapestry of autumn.

Monthly Sunshine Duration in Fjallbacka: September Highlighted

The September sunshine duration represents the total number of hours Fjallbacka experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec85h172h279h376h440h470h482h409h298h234h134h94h
Data source: Fjallbacka September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Fjallbacka During September

In Fjallbacka, Sweden, September presents a modest 27% chance of sunny weather, which reflects a notable decline after the warmer summer months. While June and July enjoy a peak sunshine likelihood at 44%, September's cloud cover tends to creep back in, reminiscent of the cooling autumn air. This trend continues into October, maintaining the same low probability for sunny days. As the vibrant hues of fall begin to paint the landscape, those hoping for sun in September may need to manage their expectations, opting instead to delight in the cozy charm of the season's transition.

Percentage of Sunny Days in September in Fjallbacka

The chart illustrates the percentage of sunny days in Fjallbacka throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Fjallbacka experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec26%38%40%51%31%44%44%36%27%27%23%26%
Data source: Fjallbacka September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Fjallbacka in September

As summer wanes in Fjallbacka, Sweden, September ushers in a gentle transition, with daylight lasting 12 hours. This marks a noticeable reduction from the 15 hours enjoyed in August, reflecting the gradual shift toward autumn. Following a peak of 18 hours in June, the daylight hours steadily descend, illustrating a captivating rhythm of nature as the days become shorter and the nights longer. As the month progresses, this decrease in sunlight fosters a cozy ambiance, inviting locals and visitors alike to embrace the striking beauty of the changing season amidst the enchanting landscapes of this coastal gem.

Average Daylight Hours in Fjallbacka for September

The chart illustrates the variation in daylight duration in Fjallbacka throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec7h 2m9h 15m11h 52m14h 31m16h 58m18h 21m17h 36m15h 21m12h 45m10h 8m7h 41m6h 16m
Data source: Fjallbacka daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Fjallbacka

As September rolls in Fjallbacka, Sweden, the winds begin to shift, with an average speed of 3.5 m/s (8 mph). This subtle increase from the summer months indicates a gentle transition towards the crispness of autumn. Throughout the summer, winds lingered around 3.1 to 3.2 m/s (7 mph), but as fall approaches, there’s a notable uptick, hinting at the changing seasons. This pattern of gradual increase continues into October, where winds soar to 4.3 m/s (10 mph), marking a lively dance with nature as it prepares for the colder months. Thus, September stands as a delightful bridge, where the leisurely breezes of summer surrender to the more invigorating gusts of autumn, inviting residents and visitors alike to experience the charm of Fjallbacka.

Average September Wind Speed in Fjallbacka

The chart displays monthly wind speed patterns in Fjallbacka, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec3.33.63.83.93.13.23.13.23.5 m/s4.33.83.5
Data source: Fjallbacka September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Fjallbacka Compares to Other Months

Weather in Fjallbacka varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Fjallbacka, focusing on differences in temperature, rainfall, humidity, and UV levels.

September and January present stark contrasts in weather conditions. In September, temperatures range from a mild 3°C (38°F) at night to a comfortable high of 21°C (71°F) during the day, coupled with an average temperature of 13°C (55°F). This month experiences about 79 mm (3.1 in) of precipitation over 13 days, with humidity hovering around 86%, creating a generally moist atmosphere. Conversely, January is much colder, with temperatures dipping as low as -15°C (6°F) and averaging around 0°C (33°F). The maximum temperature reaches only 9°C (49°F), and the month sees less precipitation at 48 mm (1.9 in) over 8 days, although humidity is higher at 94%. For more details on January weather, visit Fjallbacka weather in January.

September and February present a stark contrast in weather conditions. September enjoys milder temperatures, with a minimum of 3°C and an average of 13°C, allowing for relatively pleasant days, while February plunges to much colder temperatures, starting at a minimum of -14°C and averaging around 0°C. Although September experiences more precipitation, totaling 79 mm over 13 days, February has fewer rainy days but still receives a substantial 56 mm of moisture over 9 days. The humidity is high in both months, peaking at 86% in September and slightly higher at 92% in February. For those interested in learning more about the conditions during this frigid month, you can visit Fjallbacka weather in February.

In September, temperatures in Fjallbacka range from a chilly 3°C (38°F) at night to a comfortable 21°C (71°F) during the day, with an average of 13°C (55°F). The month sees about 79 mm (3.1 in) of precipitation spread over 13 days, with humidity levels around 86%. In contrast, March features much colder temperatures, with minimums dipping down to -14°C (7°F) and a maximum of 14°C (57°F), yielding an average of just 2°C (36°F). Precipitation is lower in March at 52 mm (2.0 in) over 9 days, but humidity slightly increases to 89%. For more specific details on the weather patterns during this month, check out Fjallbacka weather in March.

When comparing the weather in September and April, notable differences arise in temperature, precipitation, and humidity. September boasts a milder temperature range, with averages around 13°C (55°F) and highs reaching 21°C (71°F), whereas April's temperatures are generally cooler, with an average of 6°C (42°F) and lows dipping to -8°C (17°F). Additionally, September experiences more rainfall, totaling 79 mm (3.1 in) over 13 days compared to April's lighter precipitation of 29 mm (1.1 in) across just 7 days. Humidity levels are quite similar, with September at 86% and April a bit lower at 82%. For more details on April's climate, you can visit Fjallbacka weather in April.

In comparing the weather between September and May, we see notable differences in temperature and humidity. September experiences a broader temperature range with a minimum of 3°C (38°F) and a maximum of 21°C (71°F), resulting in an average of 13°C (55°F). In contrast, May features a slightly lower average temperature of 11°C (52°F), with a minimum of 1°C (34°F) and a maximum reaching 25°C (78°F). Additionally, September has higher humidity levels at 86% compared to May's 73%, contributing to a more moist atmosphere. Precipitation levels are relatively close, with September receiving 79 mm (3.1 in) over 13 days and May having slightly less at 69 mm (2.7 in) over 12 days. For more detailed insights on May weather, check Fjallbacka weather in May.

September weather is generally cooler than June, with average temperatures ranging from a minimum of 3°C (38°F) to a maximum of 21°C (71°F), compared to June's warmer range of 6°C (43°F) to 27°C (82°F). While both months experience significant precipitation, September is typically wetter, averaging 79 mm (3.1 in) over 13 days, in contrast to June’s 70 mm (2.7 in) spread over 10 days. Additionally, humidity levels are higher in September at 86%, compared to June's more comfortable 71%. For more detailed information, you can check Fjallbacka weather in June.

When comparing the weather in July and September, notable differences emerge. July tends to be warmer, with average temperatures ranging from a minimum of 8°C (47°F) to a maximum of 30°C (85°F), while September's temperatures are cooler, starting from a minimum of 3°C (38°F) and reaching a maximum of 21°C (71°F). Interestingly, both months experience similar levels of precipitation, with July recording 75 mm (3.0 in) over 11 days and September slightly higher at 79 mm (3.1 in) across 13 days. Additionally, September is more humid, with humidity levels averaging 86%, compared to July's 72%. For more detailed information about July weather conditions, check out Fjallbacka weather in July.

September typically brings a notable transition in weather compared to August. The average temperature drops from 16°C (62°F) in August to 13°C (55°F) in September, with September's maximum reaching only 21°C (71°F), while August can soar to 30°C (86°F). Additionally, September is characterized by higher humidity levels at 86%, compared to August's 77%. Although both months experience significant precipitation, September sees rainfall on 13 days, accumulating 79 mm (3.1 in), which is slightly less than August's 89 mm (3.5 in) over 15 days. For more information, you can check the detailed climate data here: Fjallbacka weather in August.

September and October showcase a distinct transition in weather patterns. In September, temperatures range from a chilly 3°C (38°F) at night to a mild 21°C (71°F) during the day, with an average of 13°C (55°F). The month sees a total precipitation of 79 mm (3.1 in) over 13 days, accompanied by high humidity levels at 86%. In contrast, October brings colder nights, with temperatures dipping to -1°C (30°F) and an average high of 18°C (64°F), leading to a lower overall average of 8°C (47°F). Precipitation increases slightly to 89 mm (3.5 in) over the same number of days, while humidity rises to 92%. This shift marks a clear move toward the chillier embrace of autumn. For more details, you can check out Fjallbacka weather in October.

In September, the weather typically features milder temperatures, with daily averages around 13°C (55°F) and highs reaching 21°C (71°F). The month experiences relatively high humidity at 86% and sees about 79 mm (3.1 in) of precipitation over approximately 13 days. In contrast, November brings a notable drop in temperatures, with an average of 4°C (40°F) and maximums capping at 15°C (58°F). The month is cooler and wetter, with humidity increasing to 93% and total precipitation slightly decreasing to 69 mm (2.7 in) across 12 days. For more specific details on November weather, you can check Fjallbacka weather in November.

In September, temperatures in Fjallbacka range from a minimum of 3°C (38°F) to a pleasant maximum of 21°C (71°F), with an average of 13°C (55°F). The month experiences relatively high humidity at 86% and sees around 79 mm (3.1 in) of precipitation over 13 days. In contrast, December brings much colder conditions, with temperatures dipping significantly; the minimum falls to -10°C (15°F), the average hovers at 1°C (34°F), and the maximum reaches only 9°C (49°F). Despite slightly less precipitation at 76 mm (3.0 in) over 14 days, the humidity increases to 93%. The stark differences in September and December weather highlight a transition from mild autumn to the depths of winter. For more details, you can check Fjallbacka weather in December.

Compare Fjallbacka's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Fjallbacka

September in Fjallbacka marks a beautiful transition from the warmth of summer to the cooler embrace of autumn. With the temperature gradually dropping, the month experiences milder days compared to the peak summer months, yet remains refreshing enough for outdoor adventures. This is also the time when increased precipitation becomes a hallmark, with more frequent rain showers that nurture the vibrant landscapes, while the rich humidity hangs in the air, creating a unique atmosphere. As you explore, take note of the changing colors and the crispness that signals the onset of fall. For more detailed insights on what to expect throughout the year, visit Fjallbacka Climate.