September Weather in Uddevalla, Sweden

Last updated: August 27, 2025

September in Uddevalla, Sweden, brings a mild yet varied climate, showcasing a maximum temperature of 24°C (75°F) and an average of 13°C (55°F). As autumn approaches, temperatures can dip to a chilly 0°C (32°F). This month experiences frequent rainfall, with 101 mm (4.0 in) of precipitation over 14 days, creating a damp atmosphere accentuated by high humidity at 86%. Perfect for cozy indoor activities or brisk walks in nature, September offers a unique blend of warmth and coolness, inviting both locals and visitors to embrace the changing seasons.

September Temperature in Uddevalla

In September, Uddevalla transitions from the lingering warmth of summer to the crisp beginnings of autumn. With temperatures ranging from a cool 0°C (32°F) at night to a pleasant max of 24°C (75°F) during the day, this month offers a delightful mix of mild conditions. The average temperature settles around 13°C (55°F), indicating a gentle descent from the sweltering heights of July and August. As daylight hours begin to shorten, the air gains a refreshing clarity that invites outdoor activities, making September an ideal time to explore the stunning natural landscapes of this coastal town. This gradual shift also heralds the arrival of fall foliage, adding vibrant colors to the already picturesque scenery.

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

The chart illustrates September temperature patterns in Uddevalla, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Uddevalla, 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).
JanFebMarAprMayJunJulAugSepOctNovDec343336445261636155484035
Data source: Temperature data for Uddevalla generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Uddevalla

In September, Uddevalla experiences a notable continuation of late-summer rain, accumulating 101 mm (4.0 in) of precipitation over 14 days. This amount represents a slight decrease from August's peak of 119 mm but remains part of a steady trend of substantial monthly rainfall that has characterized the region since the summer months. Interestingly, while both August and September see higher precipitation, the days of rain balance out, making for a relatively damp transition into the autumn months. As October approaches, precipitation levels are anticipated to slightly increase to 103 mm (4.1 in), maintaining the region's reputation for moody maritime weather. This pattern reflects the overall trend of increased rainfall typical for the autumn, highlighting a shift towards an even wetter climate ahead.

September Precipitation Trends in Uddevalla

The chart displays monthly precipitation patterns in Uddevalla, 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 Uddevalla, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec526968397576991191011037170
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Uddevalla

In September, Uddevalla experiences a noticeable increase in humidity, with levels reaching 86%. This marks a significant uptick from the drier summer months of June and July, which hovered around the low 70s. As autumn approaches, the transition in humidity is evident; it reflects the city's shift towards a wetter climate, echoing the higher levels seen in the later months of the year, like October and November, which typically maintain humidity in the low 90s. Overall, this rise suggests a refreshingly cool maritime environment that characterizes Uddevalla's early fall, as the lush landscapes prepare for the seasonal changes ahead.

September Average Humidity in Uddevalla

This chart illustrates the average monthly humidity levels in Uddevalla, 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 Uddevalla 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 Uddevalla

As September unfolds in Uddevalla, Sweden, the UV Index reflects a noticeable shift towards moderate sun exposure, registering at 4. This marks a decline from the high indexes of summer, which peaked at 7 in both July and June, where the risk of skin damage was significantly elevated with only 25 minutes of burn time. The transition to autumn brings a safer environment for outdoor activities, with a recommended burn time of 30 minutes in September. As the days grow shorter and cooler, it's a great moment to enjoy the outdoors while remaining mindful of sun safety. For more detailed insight on daily conditions, you can check the Uddevalla UV Index.

Maximum UV Index Levels in Uddevalla for September

The chart shows the monthly maximum UV Index (UVI) for Uddevalla 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 Uddevalla typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123467764211
Data source: Uddevalla 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 Uddevalla

September in Uddevalla, Sweden, boasts a notable 306 hours of sunshine, marking a gentle decline from the sun-soaked days of summer. As the leaves begin to change, this month captures a sweet spot between the vibrant brightness of July and August, where sunny hours peaked at 479 hours and 411 hours, respectively. Yet, September's brightness reminds us that summer's warmth lingers just a bit longer, providing both a transition to autumn and a chance to relish the last rays of sun before the days grow shorter. This monthly variety showcases Uddevalla’s unique ability to balance sun and shadow, encapsulating the beauty of changing seasons.

Monthly Sunshine Duration in Uddevalla: September Highlighted

The September sunshine duration represents the total number of hours Uddevalla 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.
JanFebMarAprMayJunJulAugSepOctNovDec90h175h279h378h443h470h479h411h306h245h137h98h
Data source: Uddevalla September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Uddevalla During September

In September, Uddevalla experiences a 27% chance of sunny weather, marking a slight decline from the warmer summer months. This dip follows a summer peak in June at 44%, reflecting the transition into autumn. Notably, September's sunshine likelihood is more aligned with the winter months than the vibrant spring, where peak sun probability can reach 51% in April. As the days shorten and the crisp air settles in, locals and visitors alike may find that while sunny days are less frequent, the early fall charm still offers its own unique beauty worth exploring.

Percentage of Sunny Days in September in Uddevalla

The chart illustrates the percentage of sunny days in Uddevalla 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 Uddevalla experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec25%32%38%51%28%44%39%37%27%26%22%26%
Data source: Uddevalla September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Uddevalla in September

As summer fades in Uddevalla, September brings a gentle transition with 12 hours of daylight. This marks a noticeable reduction from the 17 hours enjoyed in July and 15 hours in August, as the days become shorter heading into autumn. The month serves as a bridge between the vibrant, sun-soaked days of summer and the crisp, darker months ahead, presenting a balance of light that allows residents to savor the last hints of warmth before the daylight dwindles further to 10 hours in October. Overall, September reflects a shift towards the cozy, reflective seasons, inviting both relaxation and the anticipation of the colorful autumn foliage.

Average Daylight Hours in Uddevalla for September

The chart illustrates the variation in daylight duration in Uddevalla throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec7h 13m9h 21m11h 52m14h 26m16h 47m18h 6m17h 23m15h 14m12h 44m10h 11m7h 50m6h 30m
Data source: Uddevalla daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Uddevalla

In September, the winds in Uddevalla settle into a gentle rhythm, averaging around 3.2 m/s (7 mph). This marks a slight increase from the summer months, where winds dipped to their lowest in July at 2.9 m/s. The transition into autumn brings a refreshing breeze, preparing the landscape for the coming chill. Interestingly, this month lies within a broader trend of fluctuating wind speeds throughout the year, especially as it follows a noticeable uptick in October, where speeds rise to 4.1 m/s (9 mph). Overall, September’s winds strike a harmonious balance, providing just enough vigor to herald the shift in seasons without overwhelming the serene beauty of Uddevalla’s shores.

Average September Wind Speed in Uddevalla

The chart displays monthly wind speed patterns in Uddevalla, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.13.53.63.73.03.22.93.03.2 m/s4.13.63.2
Data source: Uddevalla September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Uddevalla Compares to Other Months

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

In comparing the weather of September and January, it is clear that these months present distinctly different climates. September enjoys milder temperatures, with averages around 13°C (55°F) and highs reaching up to 24°C (75°F), making it a pleasant time for outdoor activities. In contrast, January brings much colder conditions, with average temperatures plummeting to around 1°C (34°F) and maximums only reaching 9°C (49°F). Additionally, September experiences significantly more rainfall, totaling 101 mm (4.0 in) over 14 days, while January has less precipitation at 52 mm (2.0 in) over only 9 days. The humidity remains relatively high in both months, with September at 86% and January even higher at 94%. For more detailed information on the weather conditions during this cold winter month, you can visit Uddevalla weather in January.

September and February present two distinctly different weather experiences. In September, temperatures range from a chilly 0°C (32°F) at night to a pleasant 24°C (75°F) during the day, with an average of 13°C (55°F). This month also sees significant rainfall, totaling 101 mm (4.0 in) over about 14 days, and humidity levels reach a high of 86%. In contrast, February experiences much colder conditions, with temperatures dipping as low as -19°C (-2°F) at night and peaking at only 14°C (57°F), averaging around 0°C (33°F). The precipitation in February is relatively lower at 69 mm (2.7 in) over 10 days, accompanied by even higher humidity at 92%. For more detailed information, you can check Uddevalla weather in February.

When comparing the weather in September and March, noticeable differences emerge. September enjoys a milder temperature range, with average highs reaching 24°C (75°F) and lows around 0°C (32°F), coupled with an average humidity of 86% and considerable precipitation of 101 mm (4.0 in) over 14 days. In contrast, March presents a chillier climate, with average temperatures peaking at 14°C (58°F) and dipping to -14°C (7°F) at night. Although March experiences less precipitation at 68 mm (2.7 in) across 11 days, it features slightly higher humidity at 89%. For more detailed insights into the weather conditions in March, you can visit Uddevalla weather in March.

When comparing the weather in September and April, notable differences emerge in temperature and precipitation. September generally boasts milder temperatures, with an average of 13°C (55°F) and a maximum of 24°C (75°F), while April tends to be cooler, averaging 6°C (44°F) with highs reaching only 21°C (71°F). In terms of precipitation, September is wetter, receiving 101 mm (4.0 in) over 14 days, compared to April's 39 mm (1.5 in) over just 7 days. Humidity levels are also slightly higher in September at 86%, while April’s humidity is around 82%. For more details specific to Uddevalla, check this link: Uddevalla weather in April.

In comparing the weather of September and May, September tends to be slightly warmer overall, with average temperatures reaching up to 13°C (55°F) compared to May's average of 11°C (53°F). While both months see minimum temperatures around 0°C (32°F), September can peak at a comfortable 24°C (75°F), whereas May can rise even higher to 29°C (84°F). Precipitation is slightly heavier in September, with 101 mm (4.0 in) over about 14 days, compared to May, which has 75 mm (3.0 in) over 12 days. Additionally, September's humidity is higher at 86%, making it feel more muggy than May's relatively lower humidity of 73%. For more detailed insights into May weather, you can check Uddevalla weather in May.

In comparing the weather between September and June, September tends to be cooler, with average temperatures ranging from a chilly 0°C (32°F) to a pleasant 24°C (75°F), while June enjoys warmer conditions, with temperatures ranging from 5°C (42°F) to a maximum of 31°C (88°F). September also experiences greater humidity at 86%, compared to June's more moderate 71%. Additionally, September receives more precipitation over a longer span, totaling 101 mm (4.0 in) across 14 days, whereas June sees less rainfall at 76 mm (3.0 in) over just 10 days. For a closer look at what June holds in store, check out Uddevalla weather in June.

In September, the weather is noticeably cooler compared to July, with minimum temperatures dropping to 0°C (32°F) and average highs reaching 24°C (75°F). This contrasts sharply with July's milder temperatures, which range from a minimum of 7°C (45°F) to an average maximum of 33°C (92°F). While both months experience similar levels of precipitation—September at 101 mm (4.0 in) over 14 days and July at 99 mm (3.9 in) over 13 days—the humidity level in September is significantly higher at 86%, compared to July's 72%. For a closer look at July's weather patterns, visit Uddevalla weather in July.

In comparing the weather patterns of September and August, we see notable differences in temperature and precipitation. September experiences a cooler temperature range, with minimums dipping to 0°C (32°F) and an average of 13°C (55°F), while August is warmer, with minimums around 6°C (44°F) and averages peaking at 16°C (61°F). The maximum temperatures in August can reach up to 33°C (91°F), significantly higher than the 24°C (75°F) recorded in September. Precipitation is also relatively high in both months, with September receiving 101 mm (4.0 in) over 14 rainy days and August slightly wetter at 119 mm (4.7 in) across 16 days. Furthermore, September's humidity is higher at 86%, compared to August's 77%, contributing to the overall cooler and more damp feel of September. For more details on August weather specifically, you can check Uddevalla weather in August.

September and October exhibit notable differences in weather patterns. In September, temperatures range from a minimum of 0°C (32°F) to a maximum of 24°C (75°F), with an average of 13°C (55°F). This month experiences about 101 mm (4.0 in) of precipitation over 14 days, accompanied by a relatively high humidity level of 86%. Conversely, October sees a decline in temperatures, with minimums dropping to -5°C (24°F) and an average of 9°C (48°F). The maximum temperature also decreases to 19°C (67°F). Precipitation remains almost the same at 103 mm (4.1 in) but occurs on more days, totaling 16, and humidity rises to 92%. For more detailed insights, you can check Uddevalla weather in October.

In comparing the weather conditions between September and November, it becomes clear that November brings cooler temperatures, with an average of just 5°C (41°F) compared to September's milder average of 13°C (55°F). While September enjoys a maximum temperature of 24°C (75°F), November's highs only reach 15°C (59°F). Precipitation is generally less in November at 71 mm (2.8 in) compared to September's 101 mm (4.0 in), although both months experience precipitation on about 14 days. The humidity also rises in November, reaching 93% compared to September's 86%. For more specific information about November conditions, you can explore Uddevalla 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 24°C (75°F), with an average of 13°C (55°F). The month experiences 101 mm (4.0 in) of precipitation over 14 days, accompanied by a humidity level of 86%. Conversely, December is much colder, with temperatures dropping to a minimum of -13°C (8°F) and an average temperature of just 2°C (35°F), peaking at a maximum of 10°C (50°F). This month sees a lower total precipitation of 70 mm (2.7 in) over the same number of days, but the humidity rises to 93%. For a closer look at the specific conditions in December, check out Uddevalla weather in December.

Compare Uddevalla's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Uddevalla

As September unfolds in Uddevalla, it presents a notable transition from the lingering warmth of summer to the crisp embrace of autumn. With an average temperature hovering around a comfortable 13°C (55°F), this month offers a delightful blend of mild days and cooler nights, a stark contrast to the summer heat. The increased humidity and precipitation, typical of this time, signal a shift in the weather pattern, with rain gracing the area on about half of the days. This enhanced moisture not only nurtures the vibrant fall foliage but also adds an enchanting charm to the landscape. For a more in-depth look at what to expect throughout the year, visit Uddevalla Climate.