Last updated: February 26, 2025
September in Mannheim, Germany, presents a dynamic blend of weather conditions that make it a fascinating time of year. With maximum temperatures reaching up to 33°C (91°F), residents and visitors can enjoy warm days, while the average temperature settles around a comfortable 16°C (62°F). However, the month also sees cooler nights, dipping to a chilly 4°C (40°F). Rainfall is moderate, amounting to 46 mm (1.8 in) over 8 days, contributing to a notable humidity level of 85% that enriches the lush autumnal atmosphere. Whether basking in the sun or exploring the picturesque streets under cloudy skies, September offers an inviting experience in this vibrant city.
In September, Mannheim experiences a delightful transition from the heat of summer to the cooler autumn days. With temperatures ranging from a minimum of 4°C (40°F) to a pleasant maximum of 33°C (91°F), the month offers a comfortable average of 16°C (62°F). This marks a dip from the steamy highs of August, yet the lingering warmth allows for outdoor activities amidst the stunning autumn foliage. As the month progresses, you can expect mild evenings and vibrant days that beckon exploration, making September one of the most enjoyable months in Mannheim.
In September, Mannheim experiences a gentle decline in precipitation, receiving about 46 mm (1.8 in) of rain over 8 days. This marks a noticeable drop compared to the summer months, where rainfall was more abundant. As autumn approaches, the weather transitions into a drier phase, with September's precipitation amount falling in line with the lower averages observed in both July and August. This trend suggests a gradual shift towards cooler and crisper weather as the season progresses, setting the stage for the wetter autumn months to follow.
In Mannheim, Germany, September marks a shift in humidity levels as the summer months draw to a close. With a humidity of 85%, it reflects a gradual decrease from the peak of 84% in August, suggesting a transition towards the cooler autumn weather. This month stands out as part of a larger trend where humidity tends to progressively decline from the high averages seen in the early summer, like July and August, down to October's 88%. The gradual ebb in humidity throughout the year hints at a more comfortable climate, leading into the crisp air of fall, particularly noticeable after the sweltering heat of summer's peak. As we move towards winter, Mannheim prepares for a return to the higher humidity levels typical of the colder months, with December expected to return to 91%.
As summer transitions into autumn, September in Mannheim, Germany witnesses a significant drop in UV exposure compared to the peak months. With a UV Index of 6, categorized as high, this month marks a time when sunburn risk remains notable, with a burn time of 25 minutes for unprotected skin. While September's index reflects a slight dip from the very high levels experienced in July and August, it is still important to remain vigilant about sun safety. As temperatures begin to cool, remember that UV rays can still impact your skin. For tailored advice and updates, check the Mannheim UV Index.
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As the summer warmth begins to fade, September in Mannheim, Germany, still basks in a generous 322 hours of sunshine. This marks a notable dip from the sun-drenched months of July and August, which recorded the year's highest totals at 414 and 386 hours respectively. However, September's luminous days linger on the cusp of autumn, showcasing the city's vibrant transition. The sunshine hours gradually decline as the year progresses, with October's 257 hours signaling the impending chill. Yet, September's blend of fading summer light and the onset of cooler breezes provides a captivating backdrop for both locals and visitors to enjoy the last remnants of the sunny season.
In Mannheim, Germany, September often presents a favorable transition into autumn, with a 44% chance of sunny weather. This month stands out as one of the more promising times for sunshine, showcasing a slight uptick from the summer months, particularly August's 30%. As the year progresses, the likelihood of sunny days generally fluctuates, peaking around spring with March and April reaching 46% and 48%, respectively. By September, the climate keeps a positive momentum, making it an appealing time for outdoor activities before the cooler months set in. Observing these trends, one can appreciate how September offers a delightful balance of warmth and sunlight, positioning it as a prime time for enjoying Mannheim’s scenery.
As summer transitions to autumn in Mannheim, Germany, September brings a noticeable shift in daylight duration, with the sun illuminating the days for about 12 hours. This marks a decline from the peak of 16 hours in June and 15 hours in July, highlighting the gradual shortening of days as the year progresses. The month serves as a bridge between the longer, sun-drenched days of summer and the cooler, darker months ahead. While the daylight in September still exceeds that of the later fall months, it hints at the changing seasons, inviting residents and visitors alike to savor the last warm rays before the autumn chill sets in.
As September arrives in Mannheim, Germany, the gentle caress of the wind becomes a signature of the month, with an average wind speed of 2.0 m/s (5 mph). This represents the lowest recorded wind speed for the year, signaling a shift towards the calmer days of autumn. Following the breezier months of May and March, which boasted speeds of 3.5 m/s (8 mph) and 3.0 m/s (7 mph) respectively, September's tranquil air invites a serene transition. The gradual decline in wind speed over the summer months underscores a tender invitation to bask in the lingering warmth of late summer, making it an ideal time for leisurely strolls through the city's beautiful parks as nature prepares for the cooler months ahead.
The weather in Mannheim changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Mannheim and find detailed weather information for every month.
September and January present strikingly different weather patterns. In September, temperatures range from a minimum of 4°C (40°F) to a warm maximum of 33°C (91°F), with an average of 16°C (62°F). The month experiences around 46 mm (1.8 in) of precipitation over 8 days, while humidity stands at 85%. In contrast, January is much colder, with temperatures dipping between -10°C (14°F) and a maximum of 14°C (57°F), averaging just 3°C (37°F). This month sees higher precipitation at 60 mm (2.4 in) over 13 days, accompanied by an even higher humidity level of 91%. For a more detailed look at winter conditions, check out Mannheim weather in January.
September and February present stark contrasts in weather conditions. September enjoys a wide temperature range, with lows around 4°C and highs peaking at 33°C, averaging 16°C, while February's temperatures are much colder, ranging from -9°C to a maximum of 19°C, with an average of just 4°C. Precipitation levels are slightly higher in February at 58 mm over 11 days compared to September's 46 mm over 8 days, and humidity remains relatively high in both months, with September at 85% and February slightly higher at 89%. For more detailed information on February weather, you can visit Mannheim weather in February.
September and March present quite contrasting weather conditions. In September, temperatures range from a chilly 4°C (40°F) to a warm 33°C (91°F), with an average of 16°C (62°F), making it a month of significant warmth and pleasant days. In contrast, March experiences colder weather, with temperatures ranging from -10°C (15°F) to a maximum of 23°C (73°F), and an average of only 7°C (45°F). Additionally, March sees higher precipitation levels at 69 mm (2.7 in) over about 13 days, compared to September's 46 mm (1.8 in) over 8 days. The humidity levels are quite similar, with September at 85% and March slightly higher at 87%. For more detailed insights, you can check Mannheim weather in March.
When comparing the weather in September and April, we see notable differences in temperature and precipitation. September tends to be warmer, with average temperatures ranging from a chilly 4°C (40°F) at night to a hot 33°C (91°F) during the day, while April experiences cooler conditions, with minimum temperatures dropping to -3°C (27°F) and a maximum of 27°C (82°F). Despite both months seeing similar levels of precipitation—46 mm (1.8 in) in September and 30 mm (1.2 in) in April—September has slightly more rainy days, averaging 8 days of rain compared to 7 in April. Additionally, humidity levels are fairly comparable, with September at 85% and April at 83%. For those interested in more details, you can check out Mannheim weather in April.
When comparing the weather in September and May, September generally presents a wider temperature range, with minimums around 4°C (40°F) and maximums reaching up to 33°C (91°F). In contrast, May starts off cooler, with minimum temperatures at 1°C (33°F) and maxing out at 32°C (89°F). Although May experiences more rainfall—74 mm (2.9 in) over 12 days—September is more humid, boasting an 85% humidity level compared to May's 79%. For more detailed information, you can check Mannheim weather in May.
September and June present distinctively different weather patterns. In September, temperatures range from a cool minimum of 4°C (40°F) to a warm maximum of 33°C (91°F), with an average of 16°C (62°F). The month also experiences 46 mm (1.8 in) of precipitation over approximately 8 days, accompanied by a relatively high humidity of 85%. In contrast, June begins with a milder minimum of 8°C (46°F) and peaks at 37°C (99°F), averaging 20°C (68°F). Rainfall is heavier in June at 73 mm (2.9 in) over about 10 days, with a slightly lower humidity of 82%. For a detailed look at the weather in June, you can visit Mannheim weather in June.
When comparing the weather in September to that of July, there are notable differences in temperature, precipitation, and humidity. September experiences a wider temperature range, with minimums dropping to 4°C (40°F) and maximums reaching up to 33°C (91°F), offering an average of 16°C (62°F). In contrast, July tends to be warmer overall, with minimums around 9°C (49°F), an average of 21°C (70°F), and maximums peaking at 39°C (102°F). Precipitation levels are slightly higher in July, with 57 mm (2.2 in) over 10 days, compared to September’s 46 mm (1.8 in) over 8 days, while humidity levels remain fairly similar at 83% in July and 85% in September. For more specific details on July weather patterns, you can check out Mannheim weather in July.
September sees a noticeable shift in weather compared to August, with lower minimum temperatures dropping to 4°C (40°F) and an average of 16°C (62°F), while August maintains a warmer minimum of 8°C (46°F) and an average of 21°C (70°F). Additionally, September's maximum temperature reaches up to 33°C (91°F), which is slightly cooler than the 36°C (97°F) peak typically experienced in August. Precipitation also varies slightly, with September receiving 46 mm (1.8 in) over 8 days, compared to August’s 54 mm (2.1 in) across 10 days. Humidity levels remain similar, with September at 85% and August at 84%, highlighting the still muggy conditions typical of late summer. For further details on August weather, you can refer to Mannheim weather in August.
In comparing the weather between September and October, we see a notable shift in temperatures and precipitation patterns. September boasts a wide temperature range, with nightly lows of 4°C (40°F) and daytime highs soaring up to 33°C (91°F), averaging a comfortable 16°C (62°F). However, it experiences less precipitation, totaling 46 mm (1.8 in) over 8 days at a humidity level of 85%.
In contrast, October brings a cooler climate, with temperatures dipping to a minimum of 1°C (34°F) and a maximum of 26°C (80°F), averaging 12°C (53°F). The month sees an increase in rainfall, with 61 mm (2.4 in) spread over 12 days, and humidity slightly rising to 88%. This transition paints October as a month of more frequent, albeit lighter, showers paired with brisker temperatures. For more details on the specific weather conditions in this month, you can visit Mannheim weather in October.
In September, temperatures range from a cool 4°C (40°F) at night to a warm 33°C (91°F) during the day, with an average of 16°C (62°F). The month sees about 46 mm (1.8 in) of precipitation over roughly 8 days, while humidity is relatively high at 85%. Contrastingly, November brings a significant drop in temperatures, with minimums dipping to -3°C (26°F) and daytime highs averaging only 22°C (71°F), which results in an average temperature of 6°C (43°F). Despite having slightly higher precipitation at 50 mm (1.9 in) across 10 days, November's humidity increases to 89%. For more detailed insights about the weather in November, you can check out Mannheim weather in November.
In September, the weather is significantly warmer, with average temperatures reaching 16°C (62°F) and highs up to 33°C (91°F), compared to December's colder averages of 4°C (40°F) and maximums of 15°C (59°F). September experiences lower precipitation at 46 mm (1.8 in) over just 8 days, whereas December sees a more pronounced shift, bringing 104 mm (4.1 in) spread over 18 days. Additionally, humidity levels rise slightly in December to 91%, compared to 85% in September. For a closer look at the December climate, check out Mannheim weather in December.
As September arrives in Mannheim, the weather begins to shift noticeably, creating a delightful blend of summer warmth and the early whispers of autumn. With maximum temperatures peaking at 33°C (91°F), the month still holds onto the heat of summer, yet the average temperature drops to a more moderate 16°C (62°F), inviting more comfortable outdoor activities. Rainfall presents itself more readily, with 46 mm (1.8 in) spread over 8 days, contributing to the higher humidity of 85%. This combination of warm days and cooler evenings makes September a unique transitional period compared to the preceding summer months. For a deeper dive into how September fits into Mannheim's overall climate, check out our page on Mannheim Climate.