Last updated: August 23, 2025
In September, the average temperature in Korpilahti, Finland hovers around 10°C (51°F). Expect a chilly minimum of -2°C (29°F) and a pleasant maximum of 22°C (72°F). With an average precipitation of 74 mm (2.9 in) spread over 13 days, and a high humidity level of 90%, be prepared for a mix of cool and damp days during your visit!
In September in Korpilahti, the average temperature is 10°C (51°F). The maximum can reach 22°C (72°F) and the minimum can be as low as -2°C (29°F). This makes Korpilahti a great destination for travelers seeking a mix of mild and chilly weather during this time.
In Korpilahti in September, the precipitation amount is 74 mm (2.9 in) over the course of 13 days.
In Korpilahti in September, humidity is 90%. With an average temperature of 10°C (51°F), this humidity feels like you are wrapped in a damp blanket, making traveling quite uncomfortable and sticky, as the air hangs heavy around you, often leading to fatigue and a longing for cooler, drier conditions.
In Korpilahti 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 Korpilahti, you can check the information here.
UV Risk Categories
Weather in Korpilahti varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Korpilahti, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -5°C (23°F) | 47 mm (1.9 inches) | 98% | low |
| February Weather | -6°C (22°F) | 44 mm (1.7 inches) | 96% | low |
| March Weather | -2°C (28°F) | 43 mm (1.7 inches) | 93% | moderate |
| April Weather | 2°C (37°F) | 44 mm (1.7 inches) | 87% | moderate |
| May Weather | 9°C (49°F) | 61 mm (2.4 inches) | 75% | moderate |
| June Weather | 16°C (61°F) | 63 mm (2.5 inches) | 74% | high |
| July Weather | 17°C (63°F) | 70 mm (2.7 inches) | 80% | high |
| August Weather | 15°C (60°F) | 91 mm (3.6 inches) | 85% | moderate |
| September Weather | 10°C (51°F) | 74 mm (2.9 inches) | 90% | moderate |
| October Weather | 5°C (42°F) | 79 mm (3.1 inches) | 94% | low |
| November Weather | 1°C (35°F) | 61 mm (2.4 inches) | 94% | low |
| December Weather | -3°C (27°F) | 69 mm (2.7 inches) | 96% | low |