Last updated: August 27, 2025
In Brenna, Poland, the average temperature in September hovers around 14°C (57°F), with a comfortable range from a brisk 2°C (35°F) to a warm 29°C (84°F). Expect 123 mm (4.9 in) of precipitation spread over 14 days, contributing to an average humidity of 67%. Whether you're packing for cool mornings or warm afternoons, be prepared for a dynamic climate!
In September in Brenna, the average temperature is 14°C (57°F). The maximum can reach 29°C (84°F), while the minimum can drop to as low as 2°C (35°F). Travelers should be prepared for a range of temperatures, ensuring they pack both light clothing for warm days and warmer layers for cooler nights.
In Brenna in September, the total precipitation amount is 123 mm (4.9 in), which fell over the course of 14 days.
In Brenna in September, humidity is 67%. With an average temperature of 14°C (57°F), this humidity feels like a cool, refreshing mist that invigorates your senses, making it quite pleasant for traveling, though a light jacket is recommended as the moisture in the air can create a brisk atmosphere.
In Brenna 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 Brenna, you can refer to this Hourly UV Index in Brenna.
UV Risk Categories
Weather in Brenna varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Brenna, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (30°F) | 58 mm (2.3 inches) | 90% | low |
| February Weather | 1°C (34°F) | 76 mm (3.0 inches) | 87% | low |
| March Weather | 3°C (38°F) | 63 mm (2.5 inches) | 83% | moderate |
| April Weather | 8°C (47°F) | 75 mm (2.9 inches) | 76% | high |
| May Weather | 12°C (55°F) | 132 mm (5.2 inches) | 70% | high |
| June Weather | 18°C (64°F) | 100 mm (3.9 inches) | 71% | very high |
| July Weather | 18°C (65°F) | 123 mm (4.9 inches) | 67% | very high |
| August Weather | 19°C (66°F) | 137 mm (5.4 inches) | 64% | high |
| September Weather | 14°C (57°F) | 123 mm (4.9 inches) | 67% | high |
| October Weather | 10°C (50°F) | 102 mm (4.0 inches) | 83% | moderate |
| November Weather | 5°C (42°F) | 56 mm (2.2 inches) | 90% | low |
| December Weather | 1°C (34°F) | 89 mm (3.5 inches) | 91% | low |