Last updated: August 27, 2025
In September, Zwolle, Netherlands, experiences a delightful transition from summer warmth to autumn coolness. With a maximum temperature reaching 30°C (87°F) and a pleasant average of 15°C (59°F), the month offers diverse weather conditions. However, temperatures can dip to a minimum of 3°C (37°F), reminding residents of the upcoming seasonal changes. Rainfall is not uncommon, with a total accumulation of 69 mm (2.7 in) over 11 days, contributing to a relatively high humidity level of 83%. Whether basking in the sun or preparing for drizzles, September in Zwolle presents a unique blend of weather experiences that captures the essence of early autumn.
As autumn approaches in Zwolle, September showcases a delightful transition in temperatures, offering a pleasant escape from the summer heat. With a minimum of 3°C (37°F) and an average of 15°C (59°F), the month encourages outdoor activities amidst the crisp air. The highs can reach a warm 30°C (87°F), a fitting farewell to summer that allows residents and visitors alike to soak in the last rays of sunshine. This gradual cooling trend illustrates the shift toward winter, contrasting sharply with July and August's intense warmth, while still providing several ideal days for late-season adventures in the enchanting landscapes of the Netherlands.
In September, Zwolle experiences an average precipitation of 69 mm (2.7 in), falling on approximately 11 days throughout the month. As the summer warmth transitions into autumn, this month showcases a decline in rainfall compared to the peaks of July and August, which recorded 90 mm and 91 mm, respectively. Despite the slight reduction in both total precipitation and rainy days, September still contributes significantly to the overall annual rainfall, maintaining a robust rhythm of wet days that characterizes the region's climate. With autumn approaching, the balance between sun and rain sets the stage for the colorful foliage that follows, creating a picturesque backdrop for this Dutch city.
As September rolls in, Zwolle experiences a noticeable increase in humidity, rising to 83% after the drier summer months. This uptick marks a transition from the average humidity of 75% seen in July and August, suggesting that autumn is on the horizon. The gradual shift is indicative of the changing seasons, as the air begins to carry more moisture, merging with the crispness of fall. Interestingly, the humidity in September remains lower than the winter months, where it typically hovers around the 86-88% range from October to February. Thus, September serves as a bridge, balancing the lighter summer air with the denser, more humid conditions that characterize the latter part of the year.
As September unfolds in Zwolle, Netherlands, the UV Index reflects a gradual transition from the peak summer sun to the more temperate autumn months. With a UV Index of 5, categorized as moderate, residents can expect a burn time of approximately 30 minutes. This marks a notable decrease from the very high levels of summer, where the index reached 8 in July and June, necessitating more vigilant sun protection. As autumn approaches, it's essential to stay mindful of the sun's rays, ensuring you enjoy the outdoors safely while taking note of shifting weather patterns. For more information about UV exposure throughout the year, check out the detailed Zwolle UV Index.
UV Risk Categories
September in Zwolle, Netherlands, marks a delightful transition as summer fades into autumn, bringing 321 hours of sunshine. This month stands out as the last vestige of the long, bright days experienced during July and August, which recorded the highest sunlight hours of the year at 412 and 389 hours, respectively. As the scenery begins to shift with the changing leaves, September still offers a generous amount of light compared to the approaching darker months. Following this, October’s total of 240 hours signals a notable decline, while November and December continue the trend with only 191 hours and 128 hours of sunshine, respectively. Overall, September serves as a beautiful reminder of summer's warmth before the winter months take hold, showcasing the gradual ebb of daylight that characterizes the transition into fall.
September in Zwolle, Netherlands, offers a refreshing transition from summer to autumn, with a 31% chance of sunny weather. This percentage reflects a slight decrease from the summer months, as July and August boast a robust 33% chance of sunshine. However, considering September's position in the annual spectrum, it upholds a relatively optimistic forecast for those seeking pleasant outdoor moments. As the days begin to shorten and temperatures cool, residents and visitors alike can still expect moderate sunshine, making it a great time for strolls through the city’s picturesque parks or enjoying the last glimpses of the warmer season.
As summer gives way to autumn in September, Zwolle experiences a notable shift in daylight duration, offering around 12 hours of light each day. This marks a gentle decline from the sun-drenched months of June and July, which boasted an impressive 16 hours of daylight. With daylight diminishing gradually from August's 14 hours, September signals the transition towards shorter days as the year progresses. This reduction in sunlight is a precursor to the approaching cooler months, where daylight shrinks further to just 10 hours in October and 8 hours by November. Embracing the beauty of this change, September invites the residents of Zwolle to enjoy the last golden rays of summer before autumn settles in.
As the summer winds down in September, Zwolle experiences a noticeable shift in its breezy conditions. With an average wind speed of 3.2 m/s (7 mph), the air feels gentler compared to the brisker months preceding it. This slight decline from August's 3.8 m/s (9 mph) suggests a transition into the calmer, cooler embrace of autumn. Interestingly, while September's winds are softer, they hint at the revitalizing gales to come as October revs back up to 4.6 m/s (10 mph). This ebb and flow in wind speeds illustrates the rhythms of the changing season, inviting residents to enjoy the moderate winds before the chill ultimately sets in.
Weather in Zwolle varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Zwolle, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present contrasting weather patterns. September boasts a wider temperature range, with minimums around 3°C (37°F) and maximums reaching up to 30°C (87°F), leading to an average of 15°C (59°F). This month is relatively humid, with a humidity level of 83% and 69 mm (2.7 inches) of precipitation spread over 11 days. In contrast, January is much colder, with temperatures ranging from a frigid -8°C (18°F) to a maximum of 14°C (58°F), resulting in an average of only 4°C (39°F). Precipitation is slightly lower at 61 mm (2.4 inches), but it occurs over more days, totaling 13. Humidity in January is slightly higher at 88%. For more details, check out Zwolle weather in January.
September and February present quite contrasting weather patterns. In September, temperatures range from a mild 15°C (59°F) on average, with highs reaching up to 30°C (87°F) and lows not dropping below 3°C (37°F). The month sees an average rainfall of 69 mm (2.7 in) spread over 11 days and a relatively high humidity level at 83%. In contrast, February experiences much chillier conditions, with average temperatures around 5°C (40°F) and lows plummeting to -13°C (9°F). Featuring similar precipitation levels at 70 mm (2.7 in) over 12 days, February's humidity is slightly higher at 88%. For more specific details about February weather, you can explore Zwolle weather in February.
In comparing the weather of September and March, we see notable differences in temperature and precipitation patterns. September enjoys a range of temperatures, with a minimum of 3°C (37°F) and an average of 15°C (59°F), peaking at a warm 30°C (87°F). It experiences moderate rainfall of 69 mm (2.7 in) over approximately 11 days, coupled with high humidity at 83%. Conversely, March is considerably colder, featuring a minimum temperature of -9°C (16°F) and an average of 6°C (44°F), with a maximum of 21°C (70°F). The month sees slightly higher precipitation at 74 mm (2.9 in) but is spread over more days, around 15, and a similar humidity level of 86%. For a deeper exploration of March weather specifics, you can visit Zwolle weather in March.
In comparing the weather of September and April, September tends to be warmer, with average temperatures ranging from a minimum of 3°C (37°F) to a maximum of 30°C (87°F), while April experiences cooler temperatures, ranging from -3°C (27°F) to a maximum of 27°C (82°F). Precipitation in September is higher, averaging 69 mm (2.7 in) over 11 days, compared to April's 40 mm (1.6 in) over 9 days. Interestingly, both months exhibit high humidity levels, with September at 83% and April slightly higher at 84%. For more detailed weather information, you can check Zwolle weather in April.
In comparing the weather of September and May, both months experience maximum temperatures reaching up to 30°C (87°F), yet September boasts a higher average temperature of 15°C (59°F) compared to May's 13°C (56°F). While precipitation levels are relatively close, with September receiving 69 mm (2.7 in) over 11 days and May recording 64 mm (2.5 in) over 14 days, the humidity remains notably high in both months, at 83% in September and slightly lower at 80% in May. For a closer look at the conditions in May, you can explore Zwolle weather in May.
In comparing the weather patterns of September and June, we can see several key differences. September experiences a broader range of temperatures, with a minimum of 3°C (37°F) and a maximum of 30°C (87°F), averaging around 15°C (59°F). In contrast, June's temperatures are generally warmer, with a minimum of 6°C (43°F) and a maximum of 34°C (93°F), averaging 18°C (64°F). Both months see considerable precipitation, with September totaling 69 mm (2.7 in) over about 11 days, while June has a slightly higher total of 73 mm (2.9 in) spread over 12 days. Additionally, September has higher humidity at 83%, compared to June's 75%. For a more detailed overview, you can check out Zwolle weather in June.
When comparing the weather in September and July, several notable differences emerge. September tends to be cooler, with average temperatures ranging from a minimum of 3°C (37°F) to a maximum of 30°C (87°F), whereas July has higher averages from a minimum of 8°C (47°F) to a maximum of 38°C (101°F). Additionally, September experiences slightly less precipitation, accumulating 69 mm (2.7 in) over 11 days, compared to July's 90 mm (3.5 in) over 14 days. Humidity levels are also higher in September at 83%, compared to 75% in July, contributing to a different overall feel during the two months. For more detailed information on July weather, check out Zwolle weather in July.
In comparing the weather patterns of September and August, September tends to be cooler with a minimum temperature of 3°C (37°F) and an average of 15°C (59°F), while August sees warmer temperatures, starting at a minimum of 8°C (46°F) and averaging 18°C (65°F). August also boasts a higher maximum temperature of 34°C (94°F) compared to September's peak of 30°C (87°F). Precipitation is slightly less in September with 69 mm (2.7 in) across 11 days, compared to August's 91 mm (3.6 in) over 16 days. Notably, September experiences a higher humidity level at 83% versus August's 75%, making it feel more humid despite the cooler temperatures. For a more detailed look at August weather, you can visit Zwolle weather in August.
In September, the weather showcases a broader temperature range, with a minimum of 3°C and a maximum of 30°C, averaging around 15°C. The month sees a total precipitation of 69 mm over 11 rainy days and maintains a humidity level of 83%. In contrast, October brings cooler temperatures, with a minimum of 0°C and a maximum of 26°C, averaging 12°C. The month is slightly wetter, accumulating 85 mm of precipitation over 15 days, with humidity increasing to 86%. For more specific insights into October's weather patterns, you can visit Zwolle weather in October.
September typically offers warmer temperatures compared to November, with a minimum of 3°C (37°F) and an average high of 30°C (87°F), while November sees a drop to a minimum of -3°C (27°F) and an average high of only 19°C (66°F). Although both months experience about 11 days of precipitation, September is wetter overall, receiving 69 mm (2.7 in) compared to November's 50 mm (2.0 in). Humidity levels are slightly higher in November at 87%, but remain relatively high in September at 83%. For more details on November weather, you can check Zwolle weather in November.
In September, weather conditions are relatively mild, with temperatures ranging from a minimum of 3°C (37°F) to a maximum of 30°C (87°F), averaging around 15°C (59°F). The month experiences about 69 mm (2.7 in) of precipitation over 11 days, with humidity at a comfortable 83%. In contrast, December brings a significant drop in temperatures, with minimums reaching -6°C (22°F) and maximums capping at 14°C (57°F), averaging just 5°C (42°F). Precipitation increases slightly to 84 mm (3.3 in) over 17 days, and humidity remains high at 86%. For more details on December weather, check out Zwolle weather in December.
September in Zwolle is a month of transition, where the warmth of summer slowly gives way to the crispness of autumn. With maximum temperatures peaking at a comfortable 30°C (87°F) early in the month, the weather gradually cools down, averaging around 15°C (59°F). However, the month is not without its share of rain, as 69 mm of precipitation falls over 11 days, contributing to a higher humidity level of 83%. This unique blend of warmer days and cooler nights, paired with frequent showers, sets September apart from the drier summer months and prepares the landscape for the vibrant hues of fall. For those wanting to know more about what to expect throughout the year, explore the detailed insights found in Zwolle Climate.