Last updated: August 27, 2025
In September, the average temperature in Undersaker, Sweden hovers around 7°C (45°F). Expect chilly days, where temperatures can dip as low as -1°C (30°F) and rise to a mild 21°C (70°F). Be prepared for some rain, as 90 mm (3.5 in) of precipitation typically falls over 18 days. Don't forget your umbrella, since the average humidity is a high 92%, adding to the local atmosphere!
In September in Undersaker, the average temperature is 7°C (45°F). The maximum can reach 21°C (70°F) and the minimum can be as low as -1°C (30°F). Be prepared for a mix of mild and chilly weather, making it a great time for layered clothing while exploring the area.
In Undersaker in September, the total precipitation amount is 90 mm (3.5 in) distributed over 18 days.
In Undersaker in September, humidity is 92%. With an average temperature of 7°C (45°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities feel heavier and less enjoyable for traveling.
In Undersaker 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 Undersaker for better planning.
UV Risk Categories
Weather in Undersaker varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Undersaker, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (22°F) | 61 mm (2.4 inches) | 99% | low |
| February Weather | -6°C (21°F) | 42 mm (1.7 inches) | 97% | low |
| March Weather | -3°C (26°F) | 68 mm (2.7 inches) | 94% | moderate |
| April Weather | 0°C (32°F) | 51 mm (2.0 inches) | 89% | moderate |
| May Weather | 5°C (42°F) | 55 mm (2.2 inches) | 86% | moderate |
| June Weather | 11°C (53°F) | 83 mm (3.3 inches) | 81% | high |
| July Weather | 13°C (56°F) | 100 mm (3.9 inches) | 82% | high |
| August Weather | 11°C (53°F) | 103 mm (4.1 inches) | 90% | moderate |
| September Weather | 7°C (45°F) | 90 mm (3.5 inches) | 92% | moderate |
| October Weather | 3°C (37°F) | 86 mm (3.4 inches) | 95% | low |
| November Weather | -2°C (28°F) | 59 mm (2.3 inches) | 98% | low |
| December Weather | -5°C (24°F) | 65 mm (2.6 inches) | 100% | low |