Last updated: August 23, 2025
In September, the average temperature in Tohmajaervi, Finland hovers around 10°C (50°F). Expect a chill in the air, with minimums dipping to -3°C (27°F) and maximums reaching up to 23°C (74°F). Rain may make an appearance, bringing approximately 84 mm (3.3 in) of precipitation over 13 days. Don't forget to dress for the humidity, which averages a considerable 91%!
In September in Tohmajaervi, the average temperature is 10°C (50°F). Maximums can reach 23°C (74°F), while minimums can be as low as -3°C (27°F). Be prepared for a mix of mild days and chilly nights if you're planning to travel during this time.
In Tohmajaervi 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 Tohmajaervi in September, humidity is 91%. With an average temperature of 10°C (50°F), this humidity feels like an enveloping dampness that makes traveling a bit uncomfortable, as the moisture clings to your skin and dampens your clothes, soaking up any residual warmth from the cool air.
In Tohmajaervi 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 Tohmajaervi, you can check the information here.
UV Risk Categories
Weather in Tohmajaervi varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Tohmajaervi, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (20°F) | 52 mm (2.0 inches) | 99% | low |
| February Weather | -7°C (19°F) | 55 mm (2.2 inches) | 98% | low |
| March Weather | -3°C (26°F) | 56 mm (2.2 inches) | 95% | moderate |
| April Weather | 2°C (36°F) | 48 mm (1.9 inches) | 88% | moderate |
| May Weather | 9°C (48°F) | 56 mm (2.2 inches) | 79% | moderate |
| June Weather | 15°C (60°F) | 58 mm (2.3 inches) | 76% | high |
| July Weather | 17°C (63°F) | 92 mm (3.6 inches) | 83% | high |
| August Weather | 15°C (59°F) | 105 mm (4.1 inches) | 89% | moderate |
| September Weather | 10°C (50°F) | 84 mm (3.3 inches) | 91% | moderate |
| October Weather | 5°C (41°F) | 86 mm (3.4 inches) | 95% | low |
| November Weather | 0°C (33°F) | 64 mm (2.5 inches) | 95% | low |
| December Weather | -4°C (25°F) | 81 mm (3.2 inches) | 97% | low |