Last updated: August 27, 2025
In Insjon, Sweden, the average temperature in September hovers around 7°C (45°F). Expect a chill, as the minimum can plunge to -6°C (21°F), while the mercury can rise to a pleasant 21°C (71°F). Be prepared for 81 mm (3.2 in) of precipitation over 13 days, contributing to an average humidity of a moist 94%.
In September in Insjon, the average temperature is 7°C (45°F). Maximums can reach 21°C (71°F), and minimums can be as low as -6°C (21°F). Pack accordingly, as you'll experience a wide range of temperatures during your travels!
In Insjon in September, the precipitation amount is 81 mm (3.2 in) over the course of 13 days.
In Insjon in September, humidity is 94%. With an average temperature of 7°C (45°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities less enjoyable and travel cumbersome as you navigate through the thick, heavy air.
In Insjon in September, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Insjon, you can check the information here.
UV Risk Categories
Weather in Insjon varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Insjon, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (17°F) | 49 mm (1.9 inches) | 100% | low |
| February Weather | -9°C (17°F) | 39 mm (1.6 inches) | 98% | low |
| March Weather | -4°C (24°F) | 39 mm (1.5 inches) | 95% | low |
| April Weather | 0°C (33°F) | 33 mm (1.3 inches) | 91% | moderate |
| May Weather | 6°C (43°F) | 56 mm (2.2 inches) | 85% | moderate |
| June Weather | 13°C (55°F) | 68 mm (2.7 inches) | 79% | high |
| July Weather | 15°C (59°F) | 87 mm (3.4 inches) | 84% | high |
| August Weather | 12°C (54°F) | 92 mm (3.6 inches) | 91% | moderate |
| September Weather | 7°C (45°F) | 81 mm (3.2 inches) | 94% | moderate |
| October Weather | 2°C (36°F) | 84 mm (3.3 inches) | 96% | low |
| November Weather | -4°C (26°F) | 59 mm (2.3 inches) | 98% | low |
| December Weather | -6°C (21°F) | 67 mm (2.6 inches) | 100% | low |