Last updated: August 27, 2025
In Assen, Netherlands, September is a month of transition, where temperatures range from a maximum of 30°C (86°F) during warmer days to a crisp minimum of 4°C (40°F) in the cooler evenings. The average temperature settles at a comfortable 14°C (58°F), making it a pleasant time to enjoy the outdoors. However, expect some rain, as the month sees 66 mm (2.6 in) of precipitation spread across 11 days, contributing to an overall humidity level of 83%. This blend of mild temperatures and humidity creates a unique atmosphere, offering a refreshing start to autumn.
September in Assen, Netherlands, marks the transition from the warmth of summer to the cooler embrace of autumn. With minimum temperatures averaging around 4°C (40°F) and maximums peaking at a pleasant 30°C (86°F), the month showcases a significant drop from the highs of summer while still offering warm, sunny days. The average temperature hovers at a comfortable 14°C (58°F), providing a delightful balance for outdoor activities as the vibrant colors of fall begin to emerge. This shift not only invites a change in wardrobe but also sets the stage for cozy gatherings, making it a charming time to experience the unique beauty of Assen.
In September, Assen experiences a shift with an average precipitation of 66 mm (2.6 in), falling from the heavier rains of summer. The month sees about 11 days of rainfall, offering a refreshing reprieve as temperatures begin to cool. This marks a notable transition from the 92 mm (3.6 in) recorded in both July and August, where rainfall tended to be more abundant. Overall, September’s precipitation highlights a typical pattern of diminishing wetness as autumn approaches, setting the stage for the rainier months ahead.
September in Assen, Netherlands, ushers in a gentle change in humidity, settling at 83%. As summer ebbs away, the relative dampness subtly rises from the season's consistent 75% of July and August. This transition reflects a broader trend throughout the year, characterized by higher humidity levels during the colder months—peaking at 88% in January and February. While September's humidity may evoke memories of summer's warmth, it also signals the approach of autumn, where the air becomes a bit more crisp and invigorating, yet remains comfortably humid compared to the drier spring months. Overall, September is a month of balance, blending the lingering warmth of summer with hints of the cozy fall atmosphere ahead.
As summer transitions to autumn in September, Assen, Netherlands, experiences a notable shift in the UV Index. With a UV Index of 5 this month, categorized as moderate, sun exposure becomes more significant, calling for attention as the burn time reduces to 30 minutes. This drop from the high levels of August, which boasted a UV Index of 7, highlights a gradual decline in solar intensity. However, even in September, it's wise to remain cautious; while the risk of overexposure is lower compared to peak summer months, sun safety remains essential. For more detailed information, visit Assen UV Index.
UV Risk Categories
As September graces Assen, Netherlands with 319 hours of sunshine, it marks a gentle transition into autumn while still reflecting the vibrant energy of summer. Following the peak of 405 hours in July, the sunlight begins to wane but remains ample compared to the dimmer months ahead. This decrease is gradual; from the height of 404 hours in May to this month's sunshine, we see a consistent trend of decreasing daylight as the year progresses. However, September's generous offering still outshines the dreariness of winter, indicating the lingering warmth of summer while hinting at the cozy changes awaiting the townsfolk.
In September, Assen, Netherlands, enjoys a 30% chance of sunny weather, mirroring the sunshine probabilities seen in July and August. This month marks a transition, as the likelihood of sunny days starts to dip from the highs of summer, yet it remains relatively steady compared to the earlier months of the year, where chances fluctuate significantly—starting at just 18% in January and climbing to a peak of 41% in April. As autumn approaches, September offers a delightful balance, where residents and visitors can still bask in the sun, albeit with a hint of crispness in the air as the year shifts towards cooler temperatures.
As September rolls in, Assen, Netherlands, experiences a gentle transition from summer's long days to the cozy shorter hours of autumn. With 12 hours of daylight, this month marks a notable shift, down from the 14 hours of sunlight enjoyed in August. The trend shows a gradual decrease in daylight as the year progresses, peaking during the vibrant summer months of June and July, where daylight extends to a glorious 16 hours. The arrival of September signals a preparatory phase for the darker months ahead, making the fading light all the more precious. As autumn settles in, residents can relish the changing hues of nature, with day length continuing to dwindle to 10 hours in October and further down to 8 hours by November.
As September unfolds in Assen, Netherlands, the winds begin to soften, averaging 3.2 m/s (7 mph), making it one of the calmer months of the year. Following the somewhat breezy summer months of July and August, which saw average speeds of 3.4 m/s (8 mph) and 3.9 m/s (9 mph) respectively, September signals a gentle transition into autumn. This decline in wind speed contrasts with the uptick expected in October, where winds pick back up to an average of 4.7 m/s (10 mph). Overall, the trend reflects a seasonal shift; as summer wanes, Assen experiences a soothing lull in wind activity, inviting a moment of tranquility before the brisk autumn winds make their presence felt.
Weather in Assen varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Assen, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January showcase contrasting weather patterns. In September, temperatures range from a minimum of 4°C (40°F) to a maximum of 30°C (86°F), with an average of 14°C (58°F) and relatively high humidity at 83%. This month also sees 66 mm (2.6 in) of precipitation over approximately 11 days. In stark contrast, January brings colder weather with temperatures ranging from -8°C (17°F) to 14°C (57°F) and an average temperature of just 4°C (39°F). Although it experiences slightly less precipitation at 59 mm (2.3 in) across about 12 days, humidity is higher at 88%. For more details on January weather specifics, refer to Assen weather in January.
September weather in Assen is generally milder and more varied, with temperatures ranging from a cool 4°C (40°F) at night to a warm 30°C (86°F) during the day. This month sees an average temperature of 14°C (58°F) and experiences approximately 66 mm (2.6 in) of precipitation over about 11 days, with humidity levels around 83%. In contrast, February presents much colder conditions, with temperatures dropping to a frigid minimum of -15°C (5°F) and peaking at 18°C (65°F). The average temperature is only 4°C (40°F), and precipitation slightly decreases to 64 mm (2.5 in), occurring over about 12 days, with a higher humidity of 88%. For a closer look at what to expect, check out Assen weather in February.
In comparing the weather between September and March, significant differences emerge. September experiences milder temperatures, with a minimum of 4°C (40°F) and an average of 14°C (58°F), reaching highs of 30°C (86°F). In contrast, March is considerably cooler, featuring a minimum of -10°C (15°F) and an average of 6°C (43°F), with a maximum of 21°C (69°F). Both months see notable precipitation, with September totaling 66 mm (2.6 in) over 11 days and March slightly higher at 72 mm (2.8 in) over 14 days. Humidity levels are comparably high, with September at 83% and March at 86%. For more detailed insights into March weather, check out Assen weather in March.
September and April showcase distinct weather patterns. In September, temperatures range from a cool minimum of 4°C to a warm maximum of 30°C, with an average of 14°C, whereas April experiences a broader range from a chilly -3°C to a pleasant 28°C, averaging 9°C. Precipitation is slightly higher in September at 66 mm across 11 days, compared to April's 45 mm over 10 days, contributing to a similarly high humidity of 83% in September and 84% in April. For a detailed look at what to expect, you can visit Assen weather in April.
In September, temperatures range from a minimum of 4°C (40°F) to a maximum of 30°C (86°F), with an average of 14°C (58°F) and relatively high humidity at 83%. The month experiences about 66 mm (2.6 in) of precipitation over approximately 11 days. In contrast, May sees slightly cooler temperatures, with a minimum of -1°C (30°F) and a maximum of 31°C (87°F), while the average temperature remains close at 13°C (55°F). Precipitation in May is a bit higher at 68 mm (2.7 in) over 13 days, but humidity is slightly lower at 80%. For a detailed view of weather conditions, explore Assen weather in May.
September weather typically features a broader temperature range, with minimums dropping to 4°C (40°F) and maximums peaking at 30°C (86°F), compared to June's milder lows of 6°C (43°F) and highs of 34°C (93°F). While both months experience considerable precipitation, September sees slightly less with 66 mm (2.6 in) over 11 days, in contrast to June's 80 mm (3.1 in) across 12 days. The humidity is higher in September at 83%, while June maintains a more comfortable level at 75%. For a more detailed insight, check out Assen weather in June.
In comparing the weather of September and July, we find distinct differences in both temperature and precipitation. September typically experiences milder temperatures, with a minimum of 4°C (40°F) and an average of 14°C (58°F), while July boasts higher temperatures, ranging from a minimum of 7°C (45°F) to an average of 18°C (64°F), and maximums soaring up to 36°C (98°F). When it comes to rainfall, September has an average precipitation of 66 mm (2.6 in) over 11 days, whereas July sees more rainfall at 92 mm (3.6 in) across 14 days. Additionally, September is more humid at 83%, compared to July's 75%. For a closer look at July weather in Assen, you can check this link: Assen weather in July.
In comparing the weather between August and September, September tends to be cooler with a minimum temperature of 4°C (40°F) and an average of 14°C (58°F), while August starts warmer with a minimum of 8°C (47°F) and an average of 18°C (65°F). August also exhibits more extreme maximum temperatures, peaking at 35°C (95°F), compared to September’s maximum of 30°C (86°F). Additionally, September experiences higher humidity at 83%, despite its lower average temperatures, and faces 66 mm (2.6 in) of rain over 11 days, whereas August sees more precipitation at 92 mm (3.6 in) across 16 days. For a closer look at the weather specifics of August, you can check out Assen weather in August.
As summer fades into fall, September brings a warm average temperature of 14°C (58°F), with highs reaching up to 30°C (86°F) and a relatively humid atmosphere at 83%. The month experiences 66 mm (2.6 in) of precipitation over about 11 days, presenting a transition from the warmth of summer. In contrast, October cools down significantly, with average temperatures dropping to 12°C (53°F) and nighttime lows reaching -1°C (30°F). This month sees increased rainfall, totaling 85 mm (3.4 in) over 15 days, and slightly higher humidity at 86%. For more detailed insights into October conditions, check out Assen weather in October.
September offers a warmer and more varied climate, with temperatures ranging from a chilly 4°C (40°F) at night to a pleasant 30°C (86°F) during the day, averaging around 14°C (58°F). This month experiences significant humidity at 83% and gets about 66 mm (2.6 in) of precipitation spread over 11 days. In contrast, November sees temperatures drop considerably, with a minimum of -2°C (29°F), an average of 7°C (45°F), and a maximum of 18°C (66°F). The humidity rises slightly to 87%, and although it has slightly less precipitation at 50 mm (2.0 in), it spans 12 days, leading to a more overcast feel. For a deeper dive into what November weather looks like specifically in Assen, check out Assen weather in November.
In September, temperatures range from a mild 4°C (40°F) to a warm 30°C (86°F), with an average of 14°C (58°F). The month sees 66 mm (2.6 in) of precipitation over about 11 days, accompanied by high humidity at 83%. In contrast, December brings significantly colder conditions, with temperatures dipping as low as -7°C (19°F) and averaging around 5°C (41°F), peaking at 13°C (56°F). Precipitation in December increases to 79 mm (3.1 in) spread across 16 days, and humidity rises slightly to 86%. For more detailed information, you can check Assen weather in December.
As summer gives way to autumn, September in Assen showcases a unique tapestry of weather that sets it apart from the rest of the year. The comfortable average temperatures provide a gentle transition, while occasional maximums remind us of the lingering warmth. However, with an increase in precipitation days, this month also brings a touch of unpredictability, as frequent showers contribute to a notable rise in humidity. This balance of warmth and moisture creates a vibrant atmosphere, making September a captivating time to experience the charm of Assen. For a deeper dive into the seasonal fluctuations, check out Assen Climate.