Last updated: August 23, 2025
In Suonenjoki, Finland during the month of September, the average temperature hovers around 10°C (50°F). Temperatures can vary widely, dipping to a chilly -1°C (30°F) and soaring to a delightful 23°C (74°F). Expect about 81 mm (3.2 in) of precipitation spread over 14 days, with an average humidity level of 91%. Stay prepared for a mix of cool and warm days in this marvellous locale!
In September in Suonenjoki, the average temperature is 10°C (50°F). Maximums can reach 23°C (74°F), and minimums can be as low as -1°C (30°F). Be prepared for a range of weather conditions if you're planning to travel during this month.
In Suonenjoki in September, the precipitation amount is 81 mm (3.2 in) over a span of 14 days.
In Suonenjoki 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 Suonenjoki 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 Suonenjoki, you can check the information here.
UV Risk Categories
Weather in Suonenjoki varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Suonenjoki, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (22°F) | 48 mm (1.9 inches) | 99% | low |
| February Weather | -7°C (20°F) | 41 mm (1.6 inches) | 97% | low |
| March Weather | -3°C (27°F) | 42 mm (1.6 inches) | 95% | moderate |
| April Weather | 2°C (36°F) | 44 mm (1.7 inches) | 87% | moderate |
| May Weather | 9°C (48°F) | 58 mm (2.3 inches) | 78% | moderate |
| June Weather | 16°C (61°F) | 62 mm (2.5 inches) | 74% | high |
| July Weather | 17°C (64°F) | 84 mm (3.3 inches) | 80% | high |
| August Weather | 15°C (60°F) | 88 mm (3.5 inches) | 85% | moderate |
| September Weather | 10°C (50°F) | 81 mm (3.2 inches) | 91% | moderate |
| October Weather | 5°C (42°F) | 75 mm (2.9 inches) | 95% | low |
| November Weather | 1°C (34°F) | 65 mm (2.6 inches) | 94% | low |
| December Weather | -4°C (26°F) | 65 mm (2.6 inches) | 98% | low |