Last updated: August 27, 2025
In Sietesz, Poland, the average temperature in September hovers around 15°C (59°F). Expect a range where the mercury can dip to a brisk 1°C (35°F) or rise to a warm 30°C (86°F). Be prepared for some rain; with 83 mm (3.3 in) of precipitation spread across 11 days, you'll want to pack an umbrella! Additionally, the average humidity sits at a comfortable 69%, creating a pleasant atmosphere for your adventures.
In September in Sietesz, the average temperature is 15°C (59°F). Maximum temperatures can reach as high as 30°C (86°F), while minimum temperatures can dip down to 1°C (35°F). This range makes Sietesz an ideal destination for travelers seeking a mix of mild weather and the opportunity for outdoor activities.
In Sietesz in September, the precipitation amount is 83 mm (3.3 in) over the course of 11 days.
In Sietesz in September humidity is 69%. With an average temperature of 15°C (59°F), this humidity feels like a mild blanket wrapping around you, making it slightly uncomfortable for traveling; you'll likely find yourself seeking shade and refreshing drinks to stay cool as you explore.
In Sietesz 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 Sietesz, you can refer to this Hourly UV Index in Sietesz.
UV Risk Categories
Weather in Sietesz varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sietesz, 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) | 91% | low |
| February Weather | 1°C (34°F) | 61 mm (2.4 inches) | 88% | low |
| March Weather | 4°C (39°F) | 47 mm (1.9 inches) | 86% | moderate |
| April Weather | 9°C (49°F) | 52 mm (2.0 inches) | 77% | high |
| May Weather | 14°C (57°F) | 106 mm (4.2 inches) | 69% | high |
| June Weather | 19°C (67°F) | 88 mm (3.5 inches) | 69% | very high |
| July Weather | 20°C (68°F) | 105 mm (4.1 inches) | 63% | very high |
| August Weather | 20°C (68°F) | 89 mm (3.5 inches) | 59% | high |
| September Weather | 15°C (59°F) | 83 mm (3.3 inches) | 69% | high |
| October Weather | 11°C (51°F) | 74 mm (2.9 inches) | 85% | moderate |
| November Weather | 6°C (42°F) | 51 mm (2.0 inches) | 90% | low |
| December Weather | 1°C (35°F) | 65 mm (2.5 inches) | 91% | low |