Last updated: August 23, 2025
In September, the average temperature in Sonkajaervi, Finland is a cool 9°C (48°F). Temperatures can swing from a brisk -5°C (24°F) at their lowest to a warm 23°C (74°F) at their peak. Expect about 85 mm (3.3 in) of precipitation over 14 days, contributing to an average humidity level of an impressive 91%. Prepare for a refreshing yet variable climate!
In September in Sonkajaervi, the average temperature is 9°C (48°F). The maximum can reach 23°C (74°F), and the minimum can be as low as -5°C (24°F). Travelers should be prepared for a wide range of temperatures and pack accordingly to ensure comfort during their stay.
In Sonkajaervi in September, the precipitation amount is 85 mm (3.3 in) over the course of 14 days.
In Sonkajaervi 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 Sonkajaervi 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 Sonkajaervi, you can check the information here.
UV Risk Categories
Weather in Sonkajaervi varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sonkajaervi, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (19°F) | 48 mm (1.9 inches) | 99% | low |
| February Weather | -8°C (18°F) | 45 mm (1.8 inches) | 97% | low |
| March Weather | -4°C (25°F) | 45 mm (1.8 inches) | 95% | low |
| April Weather | 1°C (35°F) | 45 mm (1.8 inches) | 87% | moderate |
| May Weather | 8°C (47°F) | 57 mm (2.2 inches) | 78% | moderate |
| June Weather | 15°C (59°F) | 73 mm (2.9 inches) | 74% | high |
| July Weather | 17°C (62°F) | 90 mm (3.5 inches) | 80% | high |
| August Weather | 14°C (58°F) | 102 mm (4.0 inches) | 85% | moderate |
| September Weather | 9°C (48°F) | 85 mm (3.3 inches) | 91% | moderate |
| October Weather | 4°C (39°F) | 89 mm (3.5 inches) | 95% | low |
| November Weather | -1°C (31°F) | 80 mm (3.1 inches) | 94% | low |
| December Weather | -5°C (24°F) | 64 mm (2.5 inches) | 98% | low |