Last updated: August 27, 2025
In Sundbyberg, Sweden, the average temperature in September hovers around 13°C (55°F), with temperatures ranging from a chilly 0°C (33°F) to a comfortable 25°C (77°F). Visitors can expect 50 mm (2.0 in) of precipitation over 9 days, while maintaining a relatively high average humidity of 85%. Prepare accordingly for a mix of weather as you explore this vibrant destination!
In September in Sundbyberg, the average temperature is 13°C (55°F), with maximums reaching 25°C (77°F) and minimums dropping as low as 0°C (33°F). It's a great time to pack layers for your travels, as the weather can vary significantly throughout the day.
In Sundbyberg in September, the precipitation amount is 50 mm (2.0 in) over the course of 9 days.
In Sundbyberg in September, humidity is 85%. With an average temperature of 13°C (55°F), this humidity feels like a heavy blanket wrapping around you, making even short walks feel exhausting and urging travelers to seek shade and refreshment frequently.
In Sundbyberg in September, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Sundbyberg for better planning.
UV Risk Categories
Weather in Sundbyberg varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sundbyberg, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 0°C (32°F) | 38 mm (1.5 inches) | 90% | low |
| February Weather | -1°C (31°F) | 34 mm (1.3 inches) | 88% | low |
| March Weather | 2°C (35°F) | 43 mm (1.7 inches) | 89% | moderate |
| April Weather | 5°C (41°F) | 25 mm (1.0 inches) | 85% | moderate |
| May Weather | 10°C (50°F) | 52 mm (2.1 inches) | 77% | moderate |
| June Weather | 16°C (61°F) | 49 mm (1.9 inches) | 76% | high |
| July Weather | 18°C (64°F) | 55 mm (2.2 inches) | 74% | high |
| August Weather | 17°C (63°F) | 67 mm (2.6 inches) | 77% | moderate |
| September Weather | 13°C (55°F) | 50 mm (2.0 inches) | 85% | moderate |
| October Weather | 8°C (47°F) | 65 mm (2.6 inches) | 89% | low |
| November Weather | 4°C (40°F) | 43 mm (1.7 inches) | 90% | low |
| December Weather | 1°C (34°F) | 61 mm (2.4 inches) | 87% | low |