Last updated: August 23, 2025
In September, the average temperature in Kajaani, Finland hovers around 9°C (48°F). Expect a chilly minimum of -2°C (28°F), while temperatures can occasionally rise to a pleasant 22°C (72°F). With 83 mm (3.2 in) of precipitation spread over 13 days, be prepared for some rainy spells. Additionally, the air feels quite humid, with an average humidity of 91%.
In September in Kajaani, the average temperature is 9°C (48°F). Maximum temperatures can reach 22°C (72°F), while minimum temperatures can dip as low as -2°C (28°F). This variation makes it essential for travelers to pack layers to accommodate both warm and cool conditions.
In Kajaani in September, the total precipitation amount is 83 mm (3.2 in) over the course of 13 days.
In Kajaani in September, humidity is 91%. With an average temperature of 9°C (48°F), this humidity feels like a chilly embrace, making travel quite uncomfortable as the dampness permeates clothing and hangs heavy in the air, leading to a pervasive chill that lingers long after you've stepped outside.
In Kajaani 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 Kajaani, you can check the information here.
UV Risk Categories
Weather in Kajaani varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Kajaani, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (18°F) | 45 mm (1.8 inches) | 101% | low |
| February Weather | -8°C (17°F) | 41 mm (1.6 inches) | 99% | low |
| March Weather | -4°C (24°F) | 45 mm (1.8 inches) | 94% | low |
| April Weather | 1°C (34°F) | 42 mm (1.6 inches) | 88% | moderate |
| May Weather | 7°C (44°F) | 55 mm (2.2 inches) | 83% | moderate |
| June Weather | 14°C (58°F) | 71 mm (2.8 inches) | 79% | high |
| July Weather | 16°C (61°F) | 94 mm (3.7 inches) | 83% | high |
| August Weather | 14°C (58°F) | 99 mm (3.9 inches) | 87% | moderate |
| September Weather | 9°C (48°F) | 83 mm (3.2 inches) | 91% | moderate |
| October Weather | 4°C (39°F) | 86 mm (3.4 inches) | 96% | low |
| November Weather | -1°C (30°F) | 75 mm (2.9 inches) | 96% | low |
| December Weather | -5°C (23°F) | 59 mm (2.3 inches) | 100% | low |