Last updated: August 23, 2025
In Suomusjaervi, Finland, the average temperature in September hovers around 12°C (54°F). Expect a minimum temperature of -2°C (29°F) and a maximum of 23°C (73°F). It’s also a relatively wet month, with 63 mm (2.5 in) of precipitation spread over 13 days. The atmosphere is quite humid, with an average humidity level of 90%.
In September in Suomusjaervi, the average temperature is 12°C (54°F). The maximum can reach 23°C (73°F), while the minimum can drop as low as -2°C (29°F). Be prepared for a mix of mild and chilly weather, making it ideal for layering during your travels.
In Suomusjaervi in September, the precipitation amount is 63 mm (2.5 in) spread over 13 days.
In Suomusjaervi in September, humidity is 90%. With an average temperature of 12°C (54°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and traveling a bit more draining than usual.
In Suomusjaervi in September, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Suomusjaervi for better planning.
UV Risk Categories
Weather in Suomusjaervi varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Suomusjaervi, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (28°F) | 56 mm (2.2 inches) | 97% | low |
| February Weather | -3°C (26°F) | 48 mm (1.9 inches) | 95% | low |
| March Weather | -1°C (31°F) | 52 mm (2.0 inches) | 93% | moderate |
| April Weather | 4°C (39°F) | 38 mm (1.5 inches) | 86% | moderate |
| May Weather | 10°C (50°F) | 53 mm (2.1 inches) | 75% | moderate |
| June Weather | 16°C (61°F) | 52 mm (2.1 inches) | 75% | high |
| July Weather | 18°C (64°F) | 82 mm (3.2 inches) | 80% | high |
| August Weather | 16°C (62°F) | 88 mm (3.5 inches) | 83% | moderate |
| September Weather | 12°C (54°F) | 63 mm (2.5 inches) | 90% | moderate |
| October Weather | 7°C (45°F) | 87 mm (3.4 inches) | 93% | low |
| November Weather | 3°C (38°F) | 61 mm (2.4 inches) | 94% | low |
| December Weather | -1°C (31°F) | 73 mm (2.9 inches) | 95% | low |