Last updated: August 27, 2025
In September, the average temperature in Siewierz, Poland hovers around 15°C (59°F), but be prepared for some variation: it can dip as low as 1°C (34°F) or soar to a warm 31°C (89°F). Expect around 95 mm (3.7 in) of precipitation over 12 days, with an average humidity level of 72%. Whether you're savoring the pleasant temperatures or bracing for a rainy day, Siewierz offers a unique climate experience during this month!
In September in Siewierz the average temperature is 15°C (59°F). Maximum can reach 31°C (89°F) and minimum can be as low as 1°C (34°F). Be prepared for a wide range of temperatures during your trip, from warm days to potentially cool nights.
In Siewierz in September, the precipitation amount is 95 mm (3.7 in) over the course of 12 days.
In Siewierz in September humidity is 72%. With an average temperature of 15°C (59°F), this humidity feels like a warm blanket wrapping around you, creating a sultry atmosphere that can make traveling a bit uncomfortable. The stickiness in the air can leave you feeling sluggish, so it’s advisable to stay hydrated and take breaks often while exploring.
In Siewierz in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Siewierz, you can refer to this Hourly UV Index in Siewierz.
UV Risk Categories
Weather in Siewierz varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Siewierz, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (30°F) | 43 mm (1.7 inches) | 90% | low |
| February Weather | 1°C (34°F) | 56 mm (2.2 inches) | 88% | low |
| March Weather | 4°C (39°F) | 46 mm (1.8 inches) | 86% | moderate |
| April Weather | 9°C (48°F) | 64 mm (2.5 inches) | 79% | moderate |
| May Weather | 13°C (56°F) | 89 mm (3.5 inches) | 65% | high |
| June Weather | 19°C (66°F) | 85 mm (3.3 inches) | 66% | very high |
| July Weather | 19°C (67°F) | 96 mm (3.8 inches) | 67% | very high |
| August Weather | 20°C (68°F) | 102 mm (4.0 inches) | 67% | high |
| September Weather | 15°C (59°F) | 95 mm (3.7 inches) | 72% | high |
| October Weather | 10°C (51°F) | 71 mm (2.8 inches) | 83% | moderate |
| November Weather | 5°C (42°F) | 46 mm (1.8 inches) | 90% | low |
| December Weather | 1°C (35°F) | 60 mm (2.4 inches) | 92% | low |