Last updated: August 23, 2025
In September, the average temperature in Alajaervi, Finland hovers around 10°C (50°F). This month can bring a chill, with minimum temperatures dipping to -4°C (26°F), while the maximum can reach a pleasant 23°C (73°F). Expect 74 mm (2.9 in) of precipitation over approximately 14 days, contributing to an average humidity of 89%. Stay prepared for a mix of cool and wet days!
In September in Alajaervi, the average temperature is 10°C (50°F). Maximum can reach 23°C (73°F) and minimum can be as low as -4°C (26°F). This varied climate makes Alajaervi an ideal destination for travelers who appreciate both mild days and the crispness of chilly evenings.
In Alajaervi in September, the precipitation amount is 74 mm (2.9 in) over a span of 14 days.
In Alajaervi in September, humidity is 89%. With an average temperature of 10°C (50°F), this humidity feels like a dense blanket wrapping around you, making travel feel damp and chilly, and urging you to dress in layers for comfort.
In Alajaervi 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 Alajaervi, you can check the information here.
UV Risk Categories
Weather in Alajaervi varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Alajaervi, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -5°C (23°F) | 40 mm (1.6 inches) | 97% | low |
| February Weather | -6°C (21°F) | 40 mm (1.6 inches) | 95% | low |
| March Weather | -2°C (28°F) | 42 mm (1.7 inches) | 92% | moderate |
| April Weather | 2°C (36°F) | 48 mm (1.9 inches) | 85% | moderate |
| May Weather | 9°C (48°F) | 63 mm (2.5 inches) | 77% | moderate |
| June Weather | 15°C (60°F) | 60 mm (2.3 inches) | 74% | high |
| July Weather | 17°C (62°F) | 65 mm (2.6 inches) | 79% | high |
| August Weather | 15°C (59°F) | 92 mm (3.6 inches) | 82% | moderate |
| September Weather | 10°C (50°F) | 74 mm (2.9 inches) | 89% | moderate |
| October Weather | 5°C (41°F) | 81 mm (3.2 inches) | 93% | low |
| November Weather | 1°C (33°F) | 61 mm (2.4 inches) | 93% | low |
| December Weather | -3°C (26°F) | 49 mm (1.9 inches) | 95% | low |