Last updated: August 23, 2025
In September, the average temperature in Ristijaervi, Finland hovers around 9°C (48°F), with a minimum of -4°C (24°F) and a maximum reaching 23°C (74°F). Expect a precipitation amount of 84 mm (3.3 in) spread over 13 days, creating a humid environment with an average humidity level of 91%. Stay prepared for variable weather!
In September in Ristijaervi, the average temperature is 9°C (48°F), with maximums reaching 23°C (74°F) and minimums dropping as low as -4°C (24°F). This varied climate means travelers should pack layers to stay comfortable throughout the day.
In Ristijaervi in September, the precipitation amount is 84 mm (3.3 in) during 13 days, indicating a relatively wet period for that time of year.
In Ristijaervi 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 Ristijaervi 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 Ristijaervi, you can check the information here.
UV Risk Categories
Weather in Ristijaervi varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Ristijaervi, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (17°F) | 47 mm (1.9 inches) | 101% | low |
| February Weather | -9°C (16°F) | 43 mm (1.7 inches) | 99% | low |
| March Weather | -5°C (24°F) | 49 mm (1.9 inches) | 94% | low |
| April Weather | 1°C (34°F) | 43 mm (1.7 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) | 92 mm (3.6 inches) | 83% | high |
| August Weather | 14°C (57°F) | 103 mm (4.0 inches) | 87% | moderate |
| September Weather | 9°C (48°F) | 84 mm (3.3 inches) | 91% | moderate |
| October Weather | 3°C (38°F) | 92 mm (3.6 inches) | 96% | low |
| November Weather | -1°C (30°F) | 80 mm (3.2 inches) | 96% | low |
| December Weather | -5°C (23°F) | 66 mm (2.6 inches) | 100% | low |