Last updated: August 27, 2025
September in Warsaw, Poland is a month of transition, where temperatures oscillate between a maximum of 31°C (88°F) during sunny days and a cooler minimum of 2°C (35°F) at night. The average temperature settles around a comfortable 15°C (59°F), offering mild conditions for outdoor exploration. However, visitors should prepare for possible rain, as the city experiences 79 mm (3.1 in) of precipitation over approximately 12 days, contributing to a humidity level of 71%. This blend of warmth and moisture makes September an intriguing time to experience the vibrant city before autumn fully arrives.
In September, Warsaw experiences a delightful transition into autumn, with temperatures reflecting a pleasing shift after the summer's heat. The month opens with a minimum of around 2°C (35°F), gradually rising to an average of 15°C (59°F), while daily highs can reach a maximum of 31°C (88°F) early in the month. This fluctuation signifies the tail end of summer warmth, offering residents and visitors alike a perfect time to enjoy outdoor activities as the vibrant fall colors begin to emerge. As days become cooler, the contrasts in temperature highlight the unique charm of visiting Warsaw during this season, where the crisp air invites exploration of the city's rich history and culture.
In September, Warsaw experiences a notable shift in precipitation, with 79 mm (3.1 in) of rain spread across 12 days. This amount represents a slight decrease from the previous month's 92 mm (3.6 in), which marked August as the wettest period of the year. However, September's precipitation still maintains a robust presence, contributing to the lush landscapes as the summer transitions to autumn. As the month progresses, the frequency of rain tends to stabilize, reflecting a consistent wetness that is characteristic of the early fall season. This trend signals not only the gradual cooling temperatures but also the changing seasons, as Warsaw prepares for the drier months ahead.
In September, Warsaw experiences a notable transition in humidity levels as the summer wraps up, with the average humidity settling at a comfortable 71%. This marks a shift from the higher humidity typical of the warmer months, such as July and August, which hover around 59% and 60% respectively. As autumn approaches, humidity begins to rise again, setting the stage for the wetter months ahead, particularly October with its significant increase to 86%. This pattern showcases how Warsaw's humidity ebbs and flows throughout the year, creating a distinct rhythm that reflects the changing seasons.
In September, the UV Index in Warsaw, Poland, registers at 5, reflecting a moderate exposure category. This marks a decline from the peak summer months of June and July, where the index soared to a very high 8, demanding cautious sun protection within just 15 minutes of exposure. As autumn approaches, the burn time increases to 30 minutes, allowing residents to enjoy the pleasantly crisp weather while still being mindful of UV rays. This transitional period highlights a trend of diminishing UV intensity as we move towards the cooler months, but it still encourages awareness. Stay informed and protect your skin while basking in the golden glow of early autumn by checking the daily updates at Warsaw UV Index.
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As summer gracefully transitions into autumn, September in Warsaw offers a delightful balance of sunshine, with 297 hours of golden rays illuminating the city. This month stands as a vibrant culmination of the season, showcasing a noteworthy decline from the peak of 430 hours in June, yet still reflecting a proud holdover from the warm summer months. As the days gradually shorten, September gifts Warsaw a significant amount of daylight compared to the dimmer October, which sees a drop to 240 hours. This trend highlights the ephemeral nature of sunlight as the city gears up for the cooler months ahead, making every sun-soaked day in September a cherished opportunity for exploration and enjoyment.
September in Warsaw sees a 39% chance of sunny weather, marking a slight decline from the summer peak in June but a marked improvement compared to the winter months. As autumn begins to settle in, the likelihood of clear skies reflects a transition from the vibrant days of summer, influenced by varying patterns throughout the year. Interestingly, this figure aligns with July's sunshine odds, suggesting a balance in warm sunny days as the city prepares for the cooler months ahead. Overall, September presents an appealing opportunity for enjoying outdoor activities before the chill of October sets in, where the probability of sunny days rises to 44%.
As summer fades into autumn, September in Warsaw marks a gentle transition in daylight duration, offering around 12 hours of light each day. This shift reflects a gradual tapering from the sun-drenched days of July and August, which enjoy a peak of 16 hours. Following the vibrant May and June, where daylight reaches a glorious 15 and 16 hours, September presents a more mellow atmosphere, as daylight wanes alongside the vibrant hues of early autumn foliage. The approaching chill of October, with its further decrease to 10 hours, hints at the forthcoming winter months, where Warsaw will soon find itself enveloped in shorter days.
As September arrives in Warsaw, the wind begins to shift, bringing with it a gentle breeze that registers an average speed of 3.2 m/s (7 mph). This marks a slight uptick from the summer months, where winds hovered around 2.6 m/s (6 mph) in July and August, inviting a refreshing change as the city transitions into autumn. Interestingly, the wind speed starts to gain momentum as the year progresses, with October and November reaching higher averages of 3.9 m/s (9 mph) and 4.0 m/s (9 mph) respectively. This steady increase hints at the invigorating chill that autumn brings, contrasting the calm summer days and perfectly setting the stage for the crisp, lively atmosphere that defines the Polish capital in the fall.
Weather in Warsaw varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Warsaw, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January showcase stark contrasts in weather. September boasts a mild temperature range with a minimum of 2°C (35°F) and an average of 15°C (59°F), peaking at a warm 31°C (88°F). The month experiences more precipitation (79 mm) over 12 days, complemented by a moderate humidity level of 71%. In sharp contrast, January plunges into the cold with a minimum temperature of -22°C (-8°F) and an average of 0°C (32°F), peaking at only 11°C (52°F). The winter month also sees less precipitation (41 mm) over 10 days but higher humidity at 92%. For more details on January weather specifically, visit Warsaw weather in January.
September and February present starkly contrasting weather conditions. In September, temperatures range from a mild 2°C (35°F) at night to a warm 31°C (88°F) during the day, averaging 15°C (59°F). The humidity sits at 71% with about 79 mm (3.1 in) of precipitation over approximately 12 days. In contrast, February is considerably colder, with nighttime lows plunging to -17°C (1°F) and daytime highs reaching a maximum of 17°C (63°F), averaging just 1°C (33°F). The winter month also experiences higher humidity at 90%, though it sees less precipitation, totaling about 44 mm (1.7 in) over 9 days. For more detailed insights on February weather, you can check Warsaw weather in February.
September and March display contrasting weather patterns, showcasing the transition between late summer and early spring. In September, temperatures range from a pleasant minimum of 2°C (35°F) to a warm maximum of 31°C (88°F), with an average of 15°C (59°F). The month sees around 79 mm (3.1 in) of precipitation over approximately 12 days, accompanied by a moderate humidity level of 71%. In stark contrast, March experiences much colder temperatures, with a range from a low of -17°C (2°F) to a high of 19°C (66°F), averaging just 4°C (39°F). Precipitation is lower at 40 mm (1.6 in) over 11 days, but humidity is notably higher at 87%. This comparison highlights the significant shift in weather conditions between these two months. For more detailed information, check out Warsaw weather in March.
In comparing the weather conditions of September and April, we can observe distinct differences. September experiences milder temperatures, with a minimum of 2°C and an average of 15°C, while April starts off cooler, registering a minimum of -5°C and an average of 9°C. The maximum temperature in September can reach up to 31°C, significantly warmer than April's highest at 28°C. In terms of precipitation, September sees more rainfall at 79 mm over 12 days, compared to April's lighter 36 mm over 8 days. Humidity levels are fairly close, with September at 71% and April slightly higher at 76%. For a more detailed overview, you can check Warsaw weather in April.
Comparing the weather in September and May reveals some interesting contrasts. In September, temperatures range from a minimum of 2°C (35°F) to a maximum of 31°C (88°F), with an average of 15°C (59°F). This month also experiences higher humidity at 71% and slightly less rainfall, totaling 79 mm (3.1 in) over 12 days. In contrast, May has a broader temperature range with minimums dipping to -3°C (27°F) while peaking at 30°C (86°F), and an average of 14°C (57°F). Although May sees a similar amount of rainfall at 82 mm (3.2 in) across the same number of days, the humidity is notably lower at 58%. For more detailed weather information, check out Warsaw weather in May.
September and June present distinct contrasts in weather conditions. September sees a wider temperature range, with minimums dropping to 2°C (35°F) and maximums reaching up to 31°C (88°F), culminating in an average temperature of 15°C (59°F). In contrast, June is generally warmer, with temperatures ranging from a minimum of 6°C (43°F) to a maximum of 35°C (96°F), averaging around 20°C (68°F). Moreover, September experiences more precipitation, totaling 79 mm (3.1 in) over about 12 days, while June offers a slightly drier climate with 66 mm (2.6 in) spread over 10 days. The higher humidity levels in September, around 71%, compared to June's 56%, further differentiate these two months. For more details, check out Warsaw weather in June.
When comparing the weather in September and July, it’s clear that July tends to be warmer overall. In July, temperatures range from a minimum of 8°C (47°F) to a maximum of 34°C (94°F), with an average temperature of 20°C (68°F). In contrast, September experiences a wider temperature range, with a minimum of 2°C (35°F) and a maximum of 31°C (88°F), resulting in a cooler average of 15°C (59°F). Both months see similar precipitation levels, with July recording 78 mm (3.1 in) over 13 days compared to September's 79 mm (3.1 in) over 12 days. Additionally, September has a higher humidity level of 71%, compared to July's 59%. For more specific details about July weather, you can visit Warsaw weather in July.
When comparing the weather of September to August, notable differences emerge. September tends to be cooler, with minimum temperatures dropping to 2°C (35°F) compared to August's milder minimum of 7°C (46°F). The average temperature in September is around 15°C (59°F), reflecting a significant decrease from the warmer average of 20°C (68°F) in August. Maximum temperatures also experience a decline, with September peaking at 31°C (88°F) versus August's hotter 35°C (95°F). Precipitation is slightly lower in September at 79 mm (3.1 in) over 12 days, while August records 92 mm (3.6 in) across 11 days. Additionally, September's humidity is higher at 71%, compared to 60% in August. For more details on August weather, visit Warsaw weather in August.
September weather in this region typically showcases a broader temperature range, with minimums around 2°C (35°F) and maximums reaching up to 31°C (88°F), resulting in an average temperature of 15°C (59°F). Precipitation is moderate, with about 79 mm (3.1 in) falling over 12 days and a humidity level of 71%. In contrast, October brings cooler weather, with minimum temperatures dropping to -1°C (30°F) and a lower average of 10°C (51°F). While maximum temperatures are milder at 24°C (75°F), the month sees slightly less precipitation at 71 mm (2.8 in) also spread over 12 days. Humidity rises to 86%, creating a distinctly more crisp and humid climate. For more details, check out Warsaw weather in October.
September and November present contrasting weather patterns. In September, temperatures range from a mild 15°C (59°F) on average, with maximum highs reaching up to 31°C (88°F), making it a comfortable month for outdoor activities. However, it also experiences moderate precipitation, totaling 79 mm (3.1 in) over about 12 days, with humidity around 71%.
In stark contrast, November ushers in much colder conditions, with average temperatures dipping to around 5°C (42°F) and minimum temperatures plummeting to -6°C (22°F). This month is considerably drier, receiving only 33 mm (1.3 in) over 7 days, but the humidity is higher at 90%. For those looking to understand what to expect during this time, more information can be found in this resource: Warsaw weather in November.
In September, the weather is quite warm, with temperatures ranging from a minimum of 2°C (35°F) to a maximum of 31°C (88°F) and an average of 15°C (59°F). The month sees a fair amount of precipitation, totaling 79 mm (3.1 in) over 12 days, with humidity levels around 71%. In contrast, December brings much colder temperatures, with a minimum of -14°C (7°F) and an average of just 1°C (35°F), peaking at 12°C (54°F). Although December has less total precipitation at 50 mm (2.0 in), the humidity is significantly higher at 93%. For more details on December's weather, you can refer to Warsaw weather in December.
As the vibrant month of September unfolds in Warsaw, the weather presents a beautiful transition from the summer heat to the crispness of autumn. With maximum temperatures occasionally reaching a pleasant 31°C (88°F), it isn’t unusual to experience warm days that invite outdoor adventures. However, as the month progresses, the average temperature drops to a more comfortable 15°C (59°F), offering a refreshing reprieve from the summer swelter. While the city does see some rain, with about 79 mm (3.1 in) falling over 12 days, this precipitation adds to the charm of September, making the lush landscapes even more vibrant. The humidity level of 71% further emphasizes this transitional period, striking a balance that makes walking through Warsaw's parks and squares particularly enjoyable. For those looking to plan a visit, September offers a unique blend of warmth and coolness that is distinct from other months. Dive deeper into what the city has to offer by exploring the comprehensive insights on Warsaw Climate.